Update to Minecraft 26.3 (#3681)

* Update to Minecraft 26.3

- Bump the server dependency, latest version and plugin api-version to 26.3
- Add the configuration POST_EFFECTS packet and shift the following ids
- Add the CHANGE_DESTROY_DIRECTION player dig type
- Stop resolving the legacy particle enum on 1.13+, the 26.3 particle packet has an unrelated enum
- Read optional message signatures in getMessageSignatures
- Cache parameterized structure modifiers separately from the raw field type
- Add WrappedVecDelta and WrappedPositionPath for the new entity movement packets
- Update tests for the 26.3 server classes

* Change default class type from null to void.class

.gitattributes

@@ -1 +1,2 @@
 * text=auto eol=lf
+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/CONTRIBUTING.md

@@ -1,38 +1,75 @@
-Contributing to ProtocolLib
-===========================
-This page will detail specific things that must be done if you intend to contribute to this project.
+# Contributing to ProtocolLib
 
-## Updating ProtocolLib to a New Protocol Version
-#### Before we get started:
-1. **When do we need to update the protocol version?**
-    _A Minecraft protocol version is a number for each specification of the Minecraft protocol.
-    This means it is incremented when there is a change to the [Protocol Specification](http://wiki.vg/Protocol),
-    but not necessarily for each Minecraft version update. If the latest Minecraft version contains a protocol change,
-    that means ProtocolLib needs to be updated._
-2. **When do we need to update other parts of ProtocolLib?**
-    _When the package version guard changes. The package version guard is the version string inserted
-    into the package identifier for CraftBukkit and net.minecraft.server (e.g. v1_9_R2). It is incremented
-    by Spigot if there is a major breaking change in the internal server code. This is to encourage plugins
-    that interact directly with CraftBukkit/nms code to update more specifically. However, since most of
-    ProtocolLib uses reflection, and the structure of packet classes is generally static, one will have
-    to go through the code and change imports from nms/CraftBukkit._
+ProtocolLib supports a wide range of Minecraft versions through reflection and compatibility wrappers. Changes to packet
+registration, reflection, or public wrappers can affect plugins on versions other than the one currently used for
+development, so keep changes focused and preserve existing behavior unless a break is unavoidable.
 
-#### Ready? Let's get started!
-1. Read the [Protocol Changes](http://wiki.vg/Protocol_History). Always make sure the list is both
-complete and correct. If you're unsure, don't hesitate to ask in #mcdevs (the people who maintain wiki.vg) on [libera.chat](http://libera.chat)
-or #spigot on [irc.spi.gt](http://irc.spi.gt) ([webchat](https://irc.spi.gt/iris/?channels=spigot)).
-2. Search for usages of the now-defunct NMS package guard and change them.
-3. The class `com.comphenix.protocol.PacketType` contains a list of all the packets. If any packets were added or removed
-(or had their ID changed), make sure to update this list. If a packet was removed
-in favor of usage of another packet, instead of removing it, move it to the bottom of the list
-in its section, add a deprecation warning to it, and redirect it to the packet that replaced it.
-4. `mvn` in the root directory to build the project.
-5. If tests fail in the maven build, go through the tests to make sure you removed references to any removed packets
-and changed the NMS version guards.
-6. Increment the package version in `com.comphenix.protocol.utility.Constants`.
-7. `com.comphenix.protocol.ProtocolLibrary` contains several constants that must be updated, including the Minecraft version
-and the release date.
-8. `com.comphenix.protocol.utility.MinecraftProtocolVersion` contains a map of all the protocol version integers.
-If the protocol version has been incremented, add a new line to the map.
-9. `mvn` in root directory again. If it builds successfully, test on the appropriate version of a Spigot server. If
-the build fails, debug!
+## Building ProtocolLib
+
+Use the Gradle wrapper from the repository root. The root project builds the platform-neutral library published to
+Maven. The `paper` module compiles and tests it against Paper's development bundle and produces the primary plugin,
+`build/libs/ProtocolLib.jar`. The `spigot` compatibility module produces `build/libs/ProtocolLib-Spigot.jar`.
+
+```shell
+./gradlew test
+./gradlew build shadowJar
+```
+
+`shadowJar` builds both plugin distributions with the required Byte Buddy classes included. Neither platform provider
+nor plugin descriptor is included in the Maven core artifact.
+
+ProtocolLib uses the Java 25 toolchain to compile against the current server, but production classes target Java 17 for
+compatibility with older supported servers.
+
+## Updating ProtocolLib for a Minecraft Release
+
+Start by reviewing the [Java Edition protocol](https://minecraft.wiki/w/Java_Edition_protocol) and the corresponding
+server classes. The server packet classes and codecs are authoritative when documentation and implementation differ.
+
+### 1. Update version metadata
+
+- Update `mcVersion` in `gradle.properties`.
+- Add the release to `MinecraftVersion` and update `MinecraftVersion.LATEST`.
+- Update `ProtocolLibrary.MAXIMUM_MINECRAFT_VERSION` and `ProtocolLibrary.MINECRAFT_LAST_RELEASE_DATE`.
+- Update `MinecraftProtocolVersion` if the release changed the protocol number.
+
+### 2. Reconcile packet types
+
+`PacketType` must contain a matching definition for every packet in the current server protocol registries. Compare the
+serverbound and clientbound packet classes and codecs against every protocol phase, including configuration.
+
+- Add new, renamed, or split packets and update their current IDs and aliases.
+- Do not remove an existing public `PacketType` constant. Move removed types to the deprecated section and document their
+  replacement when one exists.
+- Represent split packets as separate packet types instead of redirecting incompatible packet shapes.
+- Run the packet registry tests after changing packet definitions. A missing definition can prevent later packets in the
+  same protocol registry from being registered.
+
+### 3. Update reflection and wrappers
+
+- Inspect changed fields, constructors, records, nested classes, and stream codecs instead of relying only on class names.
+- Prefer structural or type-based reflection where names are unstable.
+- Treat the current server API shape as primary and use older supported shapes only as narrow compatibility fallbacks.
+- Put version checks at the narrowest compatibility boundary and leave the older path unchanged.
+- If an NMS concept was removed, report it as unsupported or absent rather than treating a different class as equivalent.
+- Preserve packet fields that are unrelated to the value being changed.
+- Keep converters symmetric and preserve wrapper cloning and equality semantics.
+- A custom `StructureModifier` must maintain the complete modifier contract, including safe reads and writes, field count,
+  metadata, introspection, defaults, and `withTarget()`.
+
+### 4. Add regression coverage
+
+- Initialize the test environment with `BukkitInitialization` when tests access CraftBukkit or NMS classes.
+- Exercise the actual packet structure supplied by the current Paper dependency.
+- Cover both sides of a version guard when feasible.
+- Re-enable previously disabled tests when the underlying incompatibility is fixed.
+- Run targeted tests while developing, followed by `./gradlew test`.
+- Before declaring a Minecraft release supported, build the shaded plugin and test it on the corresponding server.
+
+## Pull Request Expectations
+
+- Keep the change limited to the reported problem or release update.
+- Include regression tests for packet, reflection, converter, or wrapper behavior changes.
+- Preserve public API signatures and binary compatibility where possible.
+- Clearly document any unavoidable compatibility change.
+- Do not hide reflection failures with broad exception handling or silent fallbacks.

.github/workflows/build.yml

@@ -1,8 +1,10 @@
 name: ProtocolLib full build lifecycle
 
 on:
-  - push
-  - pull_request
+  push:
+    branches-ignore:
+      - 'gh-pages'
+  pull_request:
 
 jobs:
   build:
@@ -15,7 +17,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version: '25'
           cache: 'gradle'
 
       - name: Run gradle build lifecycle
@@ -25,4 +27,6 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: ProtocolLib
-          path: build/libs/ProtocolLib.jar
+          path: |
+            build/libs/ProtocolLib.jar
+            build/libs/ProtocolLib-Spigot.jar

.github/workflows/dev-build.yml

@@ -0,0 +1,46 @@
+name: ProtocolLib development build
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '25'
+          cache: 'gradle'
+
+      - name: Run gradle build lifecycle
+        run: |
+          COMMIT_SHA=${{ github.sha }} ./gradlew build shadowJar --no-daemon
+
+      - name: Upload plugin file
+        uses: actions/upload-artifact@v4
+        with:
+          name: ProtocolLib
+          path: |
+            build/libs/ProtocolLib.jar
+            build/libs/ProtocolLib-Spigot.jar
+
+      - name: Create or update GitHub pre-release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          COMMIT_MSG=$(git log -1 --pretty=%B)
+          SHORT_HASH=$(echo "${{ github.sha }}" | cut -c1-7)
+          RELEASE_NOTES=$(gh release view dev-build --repo ${{ github.repository }} --json body -q ".body" 2>/dev/null || echo "")
+          gh release view dev-build --repo ${{ github.repository }} || \
+            gh release create dev-build --prerelease --title "Development Build" --notes "## Changelog" --repo ${{ github.repository }}
+          NEW_NOTES="$RELEASE_NOTES"$'\n'"* [$SHORT_HASH] $COMMIT_MSG"
+          gh release edit dev-build --notes "$NEW_NOTES" --repo ${{ github.repository }}
+          gh release upload dev-build build/libs/ProtocolLib.jar#ProtocolLib.jar --clobber --repo ${{ github.repository }}
+          gh release upload dev-build build/libs/ProtocolLib-Spigot.jar#ProtocolLib-Spigot.jar --clobber --repo ${{ github.repository }}

.gitignore

@@ -181,4 +181,3 @@ logs/
 build/
 logs/
 .java-version
-gradle.properties

AGENTS.md

@@ -0,0 +1,124 @@
+# ProtocolLib Agent Guide
+
+This file applies to the entire repository. Read `.github/CONTRIBUTING.md` before changing Minecraft support, packet
+definitions, reflection, or public wrappers.
+
+## Repository Basics
+
+- The main project uses the Gradle wrapper. Do not use `TinyProtocol/pom.xml` to build ProtocolLib.
+- The Java toolchain and current Spigot dependency are defined in `build.gradle.kts`.
+- Keep the Java 25 build toolchain separate from the Java 17 production bytecode target.
+- Production code is under `src/main/java`; JUnit tests and NMS test initialization are under `src/test/java`.
+- Keep changes focused. Do not combine protocol fixes with unrelated cleanup or formatting.
+- Preserve public API and binary compatibility unless the task explicitly requires a breaking change.
+
+## Build and Test Commands
+
+```shell
+./gradlew test
+./gradlew build shadowJar
+```
+
+Run the smallest relevant test while developing:
+
+```shell
+./gradlew test --tests fully.qualified.TestClass
+./gradlew test --tests fully.qualified.TestClass.testMethod
+```
+
+After changing production Java code, run the targeted tests and then the complete test suite. Use `build shadowJar` when
+the task affects packaging, dependencies, release support, or the final plugin artifact.
+
+Do not introduce another build system, test runner, formatter, or lint tool unless the repository adopts it separately.
+
+## Important Code Areas
+
+- `PacketType.java`: public packet constants, current IDs, aliases, and deprecated packet definitions.
+- `injector/packet/internal/ProtocolRegistry_1_20_5.java`: current packet discovery and codec registration.
+- `utility/MinecraftVersion.java`: named Minecraft versions and the latest supported release.
+- `utility/MinecraftProtocolVersion.java`: Minecraft release to protocol-number mappings.
+- `ProtocolLibrary.java`: supported version bounds and latest release date.
+- `utility/MinecraftReflection.java`: centralized NMS and CraftBukkit class discovery.
+- `reflect/StructureModifier.java`: indexed packet field access and conversion contract.
+- `wrappers/`: stable public representations of unstable NMS structures.
+- `events/PacketContainer.java` and `events/AbstractStructure.java`: packet construction and typed field access.
+- `src/test/java/com/comphenix/protocol/BukkitInitialization.java`: test bootstrap for CraftBukkit and NMS access.
+
+## Minecraft Release Updates
+
+Follow the complete checklist in `.github/CONTRIBUTING.md`. In particular:
+
+- Update all version metadata together; do not bump only the Gradle dependency.
+- Reconcile every serverbound and clientbound packet in every protocol phase with `PacketType`.
+- Add packet types for newly split packets instead of forcing incompatible shapes through an older packet constant.
+- Preserve removed public `PacketType` constants in the deprecated section.
+- Update `MinecraftProtocolVersion` only when the protocol number actually changed.
+
+Every packet exposed by the current NMS protocol registries must have a matching `PacketType`. An undefined or incorrectly
+renamed packet can abort registration of later packets in the same registry.
+
+## Version Compatibility
+
+- Put version checks at the narrowest affected boundary.
+- Treat the current supported server API shape as the primary path. Use older supported shapes only as narrow fallbacks.
+- Keep the pre-change code path intact whenever possible.
+- Use named `MinecraftVersion` constants with `atOrAbove()` instead of scattered version strings.
+- A public method should keep the same signature and broad contract across versions.
+- If Minecraft removed a concept, return an unsupported or absent result consistent with existing APIs. Do not claim an
+  unrelated packet or class is the removed type.
+- When Minecraft splits one packet into several packets, expose and use the new packet types explicitly.
+- Preserve unrelated packet fields when adapting or rewriting one logical value.
+
+The current test dependency exercises the latest supported server. Review older guarded paths carefully because they may
+not execute in the local test run.
+
+## Packet and Reflection Rules
+
+- Treat the current server packet classes, record components, constructors, and codecs as authoritative.
+- Prefer existing `MinecraftReflection`, `FuzzyReflection`, and accessor helpers over new direct reflection.
+- Prefer structural and type-based matching where obfuscated names are unstable.
+- Search for an existing class resolver, converter, or accessor before adding another one.
+- Cache stable reflective lookups following nearby patterns; do not repeatedly scan classes on packet hot paths.
+- Do not hide reflection failures with broad catches, silent defaults, or unrelated fallback types.
+- Account for static fields, inherited fields, records, nested implementations, and duplicate field types when writing
+  fuzzy contracts.
+
+## `StructureModifier` Contract
+
+Typed accessors returned from packet APIs must behave like normal `StructureModifier` instances.
+
+- `size()`, `getFields()`, `getField()`, target metadata, and field metadata must agree.
+- `readSafely()` returns `null` for an absent index.
+- `writeSafely()` ignores an absent index without throwing.
+- `withTarget()` must preserve the modifier's behavior for the new target.
+- `writeDefaults()` must remain safe.
+- Converters must be applied symmetrically on reads and writes.
+
+If a packet no longer contains a real backing field, prefer an empty modifier when compatible. If a virtual field is
+required for API compatibility, initialize all modifier metadata and test its inherited methods.
+
+## Wrapper and Converter Rules
+
+- Wrapper factories, converters, getters, setters, and `deepClone()` must describe the same logical value.
+- Preserve converter symmetry: converting specific to generic and back must not unexpectedly lose represented state.
+- If a wrapper handle changes from a nested value to an entire packet, define logical `equals()` and `hashCode()` so
+  unrelated packet metadata does not affect equality.
+- Clones that represent the same logical value should compare equal.
+- Do not fabricate legacy states that the modern wire format cannot distinguish; document or surface the limitation.
+- Record or immutable packet updates must retain entity IDs, flags, and other components not owned by the wrapper.
+
+## Tests
+
+- Call `BukkitInitialization.initializeAll()` before tests that resolve CraftBukkit or NMS classes.
+- Prefer regression tests using the actual Spigot packet classes supplied by the test dependency.
+- Test reads, writes, safe access, cloning, equality, and preservation of unrelated fields when changing wrappers.
+- Test modifier metadata and inherited methods when introducing a custom `StructureModifier`.
+- Re-enable disabled tests when fixing the incompatibility that caused them to be disabled.
+- Do not weaken assertions or encode known incorrect behavior merely to make a new Minecraft version pass.
+
+## Documentation and Review
+
+- Update Javadocs when version support, nullability, or unsupported behavior changes.
+- Update `.github/CONTRIBUTING.md` when the repository-wide build or release workflow changes.
+- Keep this file operational and durable; do not add task-specific notes, temporary workarounds, or current PR details.
+- Before finishing, inspect the complete diff for accidental API changes and unrelated edits.

Readme.md

@@ -2,7 +2,7 @@
 
 Certain tasks are impossible to perform with the standard Bukkit API, and may require
 working with and even modifying Minecraft directly. A common technique is to modify incoming
-and outgoing [packets](https://wiki.vg/Protocol), or inject custom packets into the
+and outgoing packets, or inject custom packets into the
 stream. This is quite cumbersome to do, however, and most implementations will break
 as soon as a new version of Minecraft has been released, mostly due to obfuscation.
 
@@ -12,16 +12,21 @@ lead to more subtle bugs.
 
 ### Resources
 
-* [Resource Page](https://www.spigotmc.org/resources/protocollib.1997/)
-* [Dev Builds](https://ci.dmulloy2.net/job/ProtocolLib)
+* [Spigot Page](https://spigotmc.org/resources/protocollib.1997/)
+* [Releases](https://github.com/dmulloy2/ProtocolLib/releases)
+* [Dev Builds](https://ci.dmulloy2.net/job/ProtocolLib/)
 * [JavaDoc](https://ci.dmulloy2.net/job/ProtocolLib/javadoc/index.html)
+* [Protocol Wiki](https://minecraft.wiki/w/Minecraft_Wiki:Projects/wiki.vg_merge/Protocol)
+
+`ProtocolLib.jar` is the primary Paper plugin. Spigot servers must use the compatibility artifact,
+`ProtocolLib-Spigot.jar`. The Maven artifact is the platform-neutral library shared by both distributions.
 
 ### Compilation
 
 ProtocolLib is built with [Gradle](https://gradle.org/). If you have it installed, just run
 `./gradlew build` in the root project folder. Other gradle targets you may be interested in 
 include `clean`, `test`, and `shadowJar`. `shadowJar` will create a jar with all dependencies
-(ByteBuddy) included.
+(ByteBuddy) included for both Paper and Spigot.
 
 ### A new API
 
@@ -42,18 +47,11 @@ depend: [ ProtocolLib ]
 You can also add ProtocolLib as a Maven dependency:
 
 ````xml
-<repositories>
-  <repository>
-    <id>dmulloy2-repo</id>
-    <url>https://repo.dmulloy2.net/repository/public/</url>
-  </repository>
-</repositories>
-
 <dependencies>
   <dependency>
-    <groupId>com.comphenix.protocol</groupId>
+    <groupId>net.dmulloy2</groupId>
     <artifactId>ProtocolLib</artifactId>
-    <version>5.1.0</version>
+    <version>5.4.0</version>
     <scope>provided</scope>
   </dependency>
 </dependencies>
@@ -63,14 +61,56 @@ Or use the maven dependency with gradle:
 
 ```gradle
 repositories {
-    maven { url "https://repo.dmulloy2.net/repository/public/" }
+    mavenCentral()
 }
 
 dependencies {
-    compileOnly 'com.comphenix.protocol:ProtocolLib:5.1.0'
+    compileOnly 'net.dmulloy2:ProtocolLib:5.4.0'
 }
 ```
 
+#### Snapshot builds
+
+Snapshot builds are available for testing changes before the next release. To use `5.5.0-SNAPSHOT`,
+add the [public repository](https://repo.dmulloy2.net/repository/public/) and update your dependency version.
+
+For Maven:
+
+```xml
+<repositories>
+  <repository>
+    <id>dmulloy2-public</id>
+    <url>https://repo.dmulloy2.net/repository/public/</url>
+  </repository>
+</repositories>
+
+<dependencies>
+  <dependency>
+    <groupId>net.dmulloy2</groupId>
+    <artifactId>ProtocolLib</artifactId>
+    <version>5.5.0-SNAPSHOT</version>
+    <scope>provided</scope>
+  </dependency>
+</dependencies>
+```
+
+For Gradle:
+
+```gradle
+repositories {
+    mavenCentral()
+    maven {
+        url = uri('https://repo.dmulloy2.net/repository/public/')
+    }
+}
+
+dependencies {
+    compileOnly 'net.dmulloy2:ProtocolLib:5.5.0-SNAPSHOT'
+}
+```
+
+#### Accessing the API
+
 Then get a reference to ProtocolManager in onLoad() or onEnable() and you're good to go.
 
 ````java
@@ -97,25 +137,26 @@ protocolManager.addPacketListener(new PacketAdapter(
 });
 ````
 
-It's also possible to read and modify the content of these packets. For instance, you can create a global
-censor by listening for Packet3Chat events:
+It's also possible to read and modify the content of packets, including the ones sent by a client. For
+instance, you can censor the text players write on signs by listening for `UPDATE_SIGN` packets:
 
 ````java
-// Censor
+// Censor signs
 protocolManager.addPacketListener(new PacketAdapter(
     this,
     ListenerPriority.NORMAL,
-    PacketType.Play.Client.CHAT
+    PacketType.Play.Client.UPDATE_SIGN
 ) {
     @Override
     public void onPacketReceiving(PacketEvent event) {
         PacketContainer packet = event.getPacket();
-        String message = packet.getStrings().read(0);
+        String[] lines = packet.getStringArrays().read(0);
 
-        if (message.contains("shit") || message.contains("damn")) {
-            event.setCancelled(true);
-            event.getPlayer().sendMessage("Bad manners!");
+        for (int i = 0; i < lines.length; i++) {
+            lines[i] = lines[i].replace("shit", "****").replace("damn", "****");
         }
+
+        packet.getStringArrays().write(0, lines);
     }
 });
 ````

TinyProtocol/src/main/java/com/comphenix/tinyprotocol/TinyProtocol.java

@@ -64,7 +64,7 @@ public abstract class TinyProtocol {
 
     // Packets we have to intercept
     private static final Class<?> PACKET_LOGIN_IN_START = Reflection.getClass("{nms}.PacketLoginInStart", "net.minecraft.network.protocol.login.PacketLoginInStart");
-    private static final FieldAccessor<GameProfile> getGameProfile = Reflection.getField(PACKET_LOGIN_IN_START, GameProfile.class, 0);
+    private static final FieldAccessor<String> getPlayerName = new PlayerNameAccessor();
 
     // Speedup channel lookup
     private Map<String, Channel> channelLookup = new MapMaker().weakValues().makeMap();
@@ -492,6 +492,59 @@ public abstract class TinyProtocol {
         }
     }
 
+    /**
+     * Get the player name from the login start packet.
+     * This fixes the issue from 1.19 where the GameProfile field has been removed from this login packet.
+     *
+     * @author gamerover98
+     */
+    private static class PlayerNameAccessor implements FieldAccessor<String> {
+
+        private FieldAccessor<String> getPlayerName;
+        private FieldAccessor<GameProfile> getGameProfile;
+
+        PlayerNameAccessor() {
+            try {
+                this.getGameProfile = Reflection.getField(PACKET_LOGIN_IN_START, GameProfile.class, 0);
+            } catch (IllegalArgumentException illegalArgumentException) {
+                // nothing to do.
+            }
+
+            try {
+                //HOT-FIX for 1.19+
+                this.getPlayerName = Reflection.getField(PACKET_LOGIN_IN_START, String.class, 0);
+            } catch (IllegalArgumentException illegalArgumentException) {
+                // nothing to do.
+            }
+
+            if (getGameProfile == null && getPlayerName == null) {
+                throw new UnsupportedOperationException("The current server version is not supported by TinyProtocol");
+            }
+        }
+
+        @Override
+        public String get(Object target) {
+            if (getPlayerName != null) {
+                String playerName = getPlayerName.get(target);
+                return playerName.substring(0, Math.min(16, playerName.length()));
+            }
+
+            return getGameProfile.get(target).getName();
+        }
+
+        @Override
+        public void set(Object target, Object value) {
+            throw new UnsupportedOperationException("Not supported");
+        }
+
+        @Override
+        public boolean hasField(Object target) {
+            return getPlayerName != null
+                    ? getPlayerName.hasField(target)
+                    : getGameProfile.hasField(target);
+        }
+    }
+
     /**
      * Channel handler that is inserted into the player's channel pipeline, allowing us to intercept sent and received packets.
      * 
@@ -533,8 +586,7 @@ public abstract class TinyProtocol {
 
         private void handleLoginStart(Channel channel, Object packet) {
             if (PACKET_LOGIN_IN_START.isInstance(packet)) {
-                GameProfile profile = getGameProfile.get(packet);
-                channelLookup.put(profile.getName(), channel);
+                channelLookup.put(getPlayerName.get(packet), channel);
             }
         }
     }

build.gradle

@@ -1,130 +0,0 @@
-plugins {
-    id 'java-library'
-    id 'maven-publish'
-    id 'com.gradleup.shadow' version '8.3.2'
-}
-
-group = 'com.comphenix.protocol'
-version = '5.3.0'
-description = 'Provides access to the Minecraft protocol'
-
-def isSnapshot = version.endsWith('-SNAPSHOT')
-
-repositories {
-    // mavenLocal() // can speed up build, but may fail in CI
-    mavenCentral()
-
-    maven {
-        url 'https://repo.dmulloy2.net/repository/public/'
-    }
-
-    maven {
-        url 'https://hub.spigotmc.org/nexus/content/groups/public/'
-    }
-
-    maven {
-        url 'https://libraries.minecraft.net/'
-        metadataSources {
-            mavenPom()
-            artifact()
-            ignoreGradleMetadataRedirection()
-        }
-    }
-}
-
-dependencies {
-    implementation 'net.bytebuddy:byte-buddy:1.15.1'
-    compileOnly 'org.spigotmc:spigot-api:1.21.1-R0.1-SNAPSHOT'
-    compileOnly 'org.spigotmc:spigot:1.21.1-R0.1-SNAPSHOT'
-    compileOnly 'io.netty:netty-all:4.0.23.Final'
-    compileOnly 'net.kyori:adventure-text-serializer-gson:4.14.0'
-    compileOnly 'com.googlecode.json-simple:json-simple:1.1.1'
-
-    testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.10.0'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.10.0'
-    testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.10.0'
-    testImplementation 'org.mockito:mockito-core:5.6.0'
-    testImplementation 'io.netty:netty-common:4.1.97.Final'
-    testImplementation 'io.netty:netty-transport:4.1.97.Final'
-    testImplementation 'org.spigotmc:spigot:1.21.1-R0.1-SNAPSHOT'
-    testImplementation 'net.kyori:adventure-text-serializer-gson:4.14.0'
-    testImplementation 'net.kyori:adventure-text-serializer-plain:4.14.0'
-}
-
-java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
-
-    withJavadocJar()
-    withSourcesJar()
-}
-
-jar {
-    manifest {
-        attributes(
-                'paperweight-mappings-namespace': 'mojang'
-        )
-    }
-}
-
-shadowJar {
-    dependencies {
-        include(dependency('net.bytebuddy:byte-buddy:.*'))
-    }
-    relocate 'net.bytebuddy', 'com.comphenix.net.bytebuddy'
-    archiveFileName = 'ProtocolLib.jar'
-}
-
-test {
-    useJUnitPlatform()
-    testLogging {
-        exceptionFormat = 'full'
-    }
-}
-
-compileTestJava {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
-}
-
-processResources {
-    def includeBuild = isSnapshot && System.getenv('BUILD_NUMBER')
-    def fullVersion = includeBuild
-        ? version + '-' + System.getenv('BUILD_NUMBER')
-        : version
-
-    eachFile { expand(['version': fullVersion]) }
-}
-
-publishing {
-    publications {
-        mavenJava(MavenPublication) {
-            from components.java
-
-            afterEvaluate {
-                artifactId = 'ProtocolLib'
-            }
-        }
-    }
-
-    repositories {
-        maven {
-            url isSnapshot
-                ? 'https://repo.dmulloy2.net/repository/snapshots/'
-                : 'https://repo.dmulloy2.net/repository/releases/'
-
-            credentials {
-                username project.nexusUsername
-                password project.nexusPassword
-            }
-        }
-    }
-}
-
-tasks.withType(JavaCompile) {
-    options.encoding = 'UTF-8'
-}
-
-tasks.withType(Javadoc) {
-    options.encoding = 'UTF-8'
-}

build.gradle.kts

@@ -0,0 +1,134 @@
+plugins {
+    `java-library`
+    `maven-publish`
+    signing
+    id("io.github.patrick.remapper") version "1.4.3"
+    id("com.vanniktech.maven.publish") version "0.36.0"
+}
+
+group = "net.dmulloy2"
+description = "Provides access to the Minecraft protocol"
+
+val mcVersion: String by project
+val isSnapshot = version.toString().endsWith("-SNAPSHOT")
+val isJitPack = System.getenv("JITPACK")?.equals("true", ignoreCase = true) ?: false
+val commitHash = System.getenv("COMMIT_SHA") ?: ""
+val isCI = commitHash.isNotEmpty()
+
+repositories {
+    if (!isCI) {
+        mavenLocal()
+    }
+
+    mavenCentral()
+
+    maven {
+        url = uri("https://repo.codemc.io/repository/nms/")
+    }
+
+    maven {
+        url = uri("https://hub.spigotmc.org/nexus/content/groups/public/")
+    }
+
+    maven {
+        url = uri("https://libraries.minecraft.net/")
+        metadataSources {
+            mavenPom()
+            artifact()
+            ignoreGradleMetadataRedirection()
+        }
+    }
+}
+
+dependencies {
+    implementation("net.bytebuddy:byte-buddy:1.18.2")
+    compileOnly("org.spigotmc:spigot-api:${mcVersion}-R0.1-SNAPSHOT")
+    compileOnly("org.spigotmc:spigot:${mcVersion}-R0.1-SNAPSHOT")
+    compileOnly("io.netty:netty-all:4.2.8.Final")
+    compileOnly("net.kyori:adventure-text-serializer-gson:4.25.0")
+    compileOnly("com.googlecode.json-simple:json-simple:1.1.1")
+    compileOnly("commons-lang:commons-lang:2.6")
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(25))
+    }
+}
+
+sourceSets {
+    test {
+        java.setSrcDirs(emptyList<String>())
+        resources.setSrcDirs(emptyList<String>())
+    }
+}
+
+tasks {
+    test {
+        dependsOn(":paper:test")
+    }
+
+    check {
+        dependsOn(":paper:check", ":spigot:check")
+    }
+
+    javadoc {
+        options.encoding = "UTF-8"
+    }
+
+    compileJava {
+        options.encoding = "UTF-8"
+        options.release.set(17)
+    }
+}
+
+tasks.register("shadowJar") {
+    group = "build"
+    description = "Builds the Paper and Spigot plugin distributions."
+    dependsOn(":paper:shadowJar", ":spigot:shadowJar")
+}
+
+mavenPublishing {
+    publishToMavenCentral()
+    if (!isSnapshot && !isJitPack) {
+        signAllPublications()
+    }
+
+    coordinates("$group", project.name, "$version")
+
+    pom {
+        name.set(project.name)
+        description.set(project.description)
+        inceptionYear.set("2012")
+        url.set("https://github.com/dmulloy2/ProtocolLib")
+
+        developers {
+            developer {
+                id.set("dmulloy2")
+                name.set("Dan Mulloy")
+                url.set("https://dmulloy2.net/")
+                email.set("dev@dmulloy2.net")
+            }
+        }
+
+        licenses {
+            license {
+                name.set("GNU GENERAL PUBLIC LICENSE - Version 2, June 1991")
+                url.set("https://www.gnu.org/licenses/gpl-2.0.txt")
+                distribution.set("repo")
+            }
+        }
+
+        scm {
+            tag.set("HEAD")
+            url.set("https://github.com/dmulloy2/ProtocolLib")
+            connection.set("scm:git:git://github.com/dmulloy2/ProtocolLib.git")
+            developerConnection.set("scm:git:git@github.com:dmulloy2/ProtocolLib.git")
+        }
+
+        issueManagement {
+            system.set("GitHub Issues")
+            url.set("https://github.com/dmulloy2/ProtocolLib/issues")
+        }
+    }
+}

gradle.properties

@@ -1,2 +1,7 @@
-nexusUsername=""
-nexusPassword=""
+version=5.5.0-SNAPSHOT
+mcVersion=26.3
+mavenCentralUsername=
+mavenCentralPassword=
+signing.keyId=
+signing.password=
+signing.secretKeyRingFile=

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright © 2015 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/2d6327017519d23b96af35865dc997fcb544fb40/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -84,7 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -112,7 +114,6 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
 
 # Determine the Java command to use to start the JVM.
@@ -170,7 +171,6 @@ fi
 # For Cygwin or MSYS, switch paths to Windows format before running java
 if "$cygwin" || "$msys" ; then
     APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
-    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
 
     JAVACMD=$( cygpath --unix "$JAVACMD" )
 
@@ -203,15 +203,14 @@ fi
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Collect all arguments for the java command:
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
 #     and any embedded shellness will be escaped.
 #   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
 #     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
-        -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.

gradlew.bat

@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,22 +59,21 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell

paper/build.gradle.kts

@@ -0,0 +1,104 @@
+import org.gradle.api.attributes.java.TargetJvmVersion
+import org.gradle.api.tasks.testing.logging.TestExceptionFormat
+
+plugins {
+    `java-library`
+    id("com.gradleup.shadow") version "9.4.0"
+    id("io.papermc.paperweight.userdev") version "2.0.0-beta.21"
+}
+
+group = "net.dmulloy2"
+version = rootProject.version
+
+val mcVersion: String by project
+val isSnapshot = version.toString().endsWith("-SNAPSHOT")
+val commitHash = System.getenv("COMMIT_SHA") ?: ""
+val isCI = commitHash.isNotEmpty()
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+    maven("https://repo.papermc.io/repository/maven-public/")
+    maven("https://repo.codemc.io/repository/nms/")
+    maven("https://hub.spigotmc.org/nexus/content/groups/public/")
+    maven("https://libraries.minecraft.net/") {
+        metadataSources {
+            mavenPom()
+            artifact()
+            ignoreGradleMetadataRedirection()
+        }
+    }
+}
+
+dependencies {
+    implementation(project(":"))
+    paperweight.paperDevBundle("$mcVersion.build.+")
+
+    compileOnly("io.netty:netty-all:4.2.8.Final")
+    compileOnly("net.kyori:adventure-text-serializer-gson:4.25.0")
+    compileOnly("commons-lang:commons-lang:2.6")
+
+    testImplementation("org.junit.jupiter:junit-jupiter-engine:6.0.1")
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:6.0.1")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher:6.0.1")
+    testImplementation("org.mockito:mockito-core:5.21.0")
+    testImplementation("io.netty:netty-common:4.2.8.Final")
+    testImplementation("io.netty:netty-transport:4.2.8.Final")
+    testImplementation("net.kyori:adventure-text-serializer-gson:4.25.0")
+    testImplementation("net.kyori:adventure-text-serializer-plain:4.25.0")
+    testImplementation("commons-lang:commons-lang:2.6")
+}
+
+paperweight.reobfArtifactConfiguration =
+    io.papermc.paperweight.userdev.ReobfArtifactConfiguration.MOJANG_PRODUCTION
+
+configurations.matching { it.name == "compileClasspath" || it.name == "runtimeClasspath" || it.name == "testCompileClasspath" || it.name == "testRuntimeClasspath" }.configureEach {
+    attributes {
+        attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 25)
+    }
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(25))
+    }
+}
+
+sourceSets {
+    test {
+        java.srcDir(rootProject.file("src/test/java"))
+        resources.srcDir(rootProject.file("src/test/resources"))
+    }
+}
+
+tasks {
+    processResources {
+        val fullVersion = if (isSnapshot && isCI) "${version}-${commitHash.take(7)}" else version
+
+        eachFile {
+            expand("version" to fullVersion)
+        }
+    }
+
+    test {
+        useJUnitPlatform()
+        testLogging {
+            exceptionFormat = TestExceptionFormat.FULL
+        }
+    }
+
+    compileJava {
+        options.release.set(17)
+    }
+
+    shadowJar {
+        relocate("net.bytebuddy", "com.comphenix.net.bytebuddy")
+
+        manifest {
+            attributes("paperweight-mappings-namespace" to "mojang")
+        }
+
+        destinationDirectory.set(rootProject.layout.buildDirectory.dir("libs"))
+        archiveFileName.set("ProtocolLib.jar")
+    }
+}

paper/src/main/java/com/comphenix/protocol/paper/PaperPlatformProvider.java

@@ -0,0 +1,105 @@
+package com.comphenix.protocol.paper;
+
+import java.util.List;
+import java.util.function.Consumer;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+
+import com.comphenix.protocol.ProtocolLib;
+import com.comphenix.protocol.internal.PlatformProvider;
+
+import io.netty.channel.Channel;
+import io.papermc.paper.command.brigadier.BasicCommand;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import io.papermc.paper.network.ChannelInitializeListenerHolder;
+import net.kyori.adventure.key.Key;
+
+public final class PaperPlatformProvider implements PlatformProvider {
+
+    public static final Key CHANNEL_INITIALIZER_KEY = Key.key("protocollib", "channel-initializer");
+
+    @Override
+    public boolean hasEarlyChannelInitialization() {
+        return true;
+    }
+
+    @Override
+    public Runnable registerChannelInitializer(Consumer<Channel> channelInitializer) {
+        ChannelInitializeListenerHolder.addListener(CHANNEL_INITIALIZER_KEY, channelInitializer::accept);
+        return () -> ChannelInitializeListenerHolder.removeListener(CHANNEL_INITIALIZER_KEY);
+    }
+
+    @Override
+    public void registerCommand(ProtocolLib plugin, String name, CommandExecutor executor) {
+        CommandMetadata metadata = getMetadata(name);
+        Command command = new RegisteredCommand(name, metadata);
+
+        plugin.registerCommand(
+                name,
+                metadata.description(),
+                metadata.aliases(),
+                new RegisteredBasicCommand(name, metadata, command, executor));
+    }
+
+    private static CommandMetadata getMetadata(String name) {
+        return switch (name) {
+            case "protocol" -> new CommandMetadata(
+                    "Performs administrative tasks regarding ProtocolLib.",
+                    "/<command> config|check|update|timings|listeners|version|dump",
+                    "protocol.admin",
+                    List.of());
+            case "packet" -> new CommandMetadata(
+                    "Add or remove a simple packet listener.",
+                    "/<command> add|remove|names client|server [ID start]-[ID stop] [detailed]",
+                    "protocol.admin",
+                    List.of());
+            case "filter" -> new CommandMetadata(
+                    "Add or remove programmable filters to the packet listeners.",
+                    "/<command> add|remove name [ID start]-[ID stop]",
+                    "protocol.admin",
+                    List.of("packet_filter"));
+            case "packetlog" -> new CommandMetadata(
+                    "Logs hex representations of packets to a file or console",
+                    "/<command> <protocol> <sender> <packet> [location]",
+                    "protocol.admin",
+                    List.of());
+            default -> throw new IllegalArgumentException("Unknown ProtocolLib command " + name);
+        };
+    }
+
+    private record CommandMetadata(String description, String usage, String permission, List<String> aliases) {
+    }
+
+    private record RegisteredBasicCommand(
+            String name,
+            CommandMetadata metadata,
+            Command command,
+            CommandExecutor executor) implements BasicCommand {
+
+        @Override
+        public void execute(CommandSourceStack source, String[] arguments) {
+            if (!this.executor.onCommand(source.getSender(), this.command, this.name, arguments)) {
+                source.getSender().sendMessage(this.metadata.usage().replace("<command>", this.name));
+            }
+        }
+
+        @Override
+        public String permission() {
+            return this.metadata.permission();
+        }
+    }
+
+    private static final class RegisteredCommand extends Command {
+
+        private RegisteredCommand(String name, CommandMetadata metadata) {
+            super(name, metadata.description(), metadata.usage(), metadata.aliases());
+        }
+
+        @Override
+        public boolean execute(CommandSender sender, String commandLabel, String[] args) {
+            throw new UnsupportedOperationException();
+        }
+    }
+}

paper/src/main/resources/META-INF/services/com.comphenix.protocol.internal.PlatformProvider

@@ -0,0 +1 @@
+com.comphenix.protocol.paper.PaperPlatformProvider

paper/src/main/resources/paper-plugin.yml

@@ -0,0 +1,22 @@
+name: ProtocolLib
+version: ${version}
+description: Provides read/write access to the Minecraft protocol.
+authors: [dmulloy2]
+
+main: com.comphenix.protocol.ProtocolLib
+load: STARTUP
+api-version: "26.3"
+folia-supported: true
+
+permissions:
+  protocol.*:
+    description: Gives access to everything.
+    children:
+      protocol.admin: true
+      protocol.info: true
+  protocol.admin:
+    description: Able to initiate the update process and configure debug mode.
+    default: op
+  protocol.info:
+    description: Can read update notifications and error reports.
+    default: op

settings.gradle

@@ -3,3 +3,5 @@
  */
 
 rootProject.name = 'ProtocolLib'
+
+include 'paper', 'spigot'

spigot/build.gradle.kts

@@ -0,0 +1,79 @@
+import org.gradle.api.attributes.java.TargetJvmVersion
+
+plugins {
+    `java-library`
+    id("com.gradleup.shadow") version "9.4.0"
+}
+
+group = "net.dmulloy2"
+version = rootProject.version
+
+val mcVersion: String by project
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+    maven("https://repo.codemc.io/repository/nms/")
+    maven("https://hub.spigotmc.org/nexus/content/groups/public/")
+    maven("https://libraries.minecraft.net/") {
+        metadataSources {
+            mavenPom()
+            artifact()
+            ignoreGradleMetadataRedirection()
+        }
+    }
+}
+
+dependencies {
+    implementation(project(":"))
+    compileOnly("org.spigotmc:spigot-api:${mcVersion}-R0.1-SNAPSHOT")
+    compileOnly("org.spigotmc:spigot:${mcVersion}-R0.1-SNAPSHOT")
+    compileOnly("io.netty:netty-all:4.2.8.Final")
+    compileOnly("net.kyori:adventure-text-serializer-gson:4.25.0")
+    compileOnly("com.googlecode.json-simple:json-simple:1.1.1")
+
+    testImplementation("org.junit.jupiter:junit-jupiter-engine:6.0.1")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher:6.0.1")
+    testImplementation("org.mockito:mockito-core:5.21.0")
+    testImplementation("io.netty:netty-transport:4.2.8.Final")
+    testImplementation("org.spigotmc:spigot:${mcVersion}-R0.1-SNAPSHOT")
+}
+
+configurations.matching { it.name == "compileClasspath" || it.name == "runtimeClasspath" || it.name == "testCompileClasspath" || it.name == "testRuntimeClasspath" }.configureEach {
+    attributes {
+        attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 25)
+    }
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(25))
+    }
+}
+
+tasks {
+    processResources {
+        eachFile {
+            expand("version" to project.version)
+        }
+    }
+
+    test {
+        useJUnitPlatform()
+    }
+
+    compileJava {
+        options.release.set(17)
+    }
+
+    shadowJar {
+        relocate("net.bytebuddy", "com.comphenix.net.bytebuddy")
+
+        manifest {
+            attributes("paperweight-mappings-namespace" to "mojang")
+        }
+
+        destinationDirectory.set(rootProject.layout.buildDirectory.dir("libs"))
+        archiveFileName.set("ProtocolLib-Spigot.jar")
+    }
+}

spigot/src/main/java/com/comphenix/protocol/spigot/SpigotPlatformProvider.java

@@ -0,0 +1,34 @@
+package com.comphenix.protocol.spigot;
+
+import java.util.function.Consumer;
+
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.PluginCommand;
+
+import com.comphenix.protocol.ProtocolLib;
+import com.comphenix.protocol.internal.PlatformProvider;
+
+import io.netty.channel.Channel;
+
+public final class SpigotPlatformProvider implements PlatformProvider {
+
+    @Override
+    public boolean hasEarlyChannelInitialization() {
+        return false;
+    }
+
+    @Override
+    public Runnable registerChannelInitializer(Consumer<Channel> channelInitializer) {
+        throw new UnsupportedOperationException("Early channel initialization is unavailable");
+    }
+
+    @Override
+    public void registerCommand(ProtocolLib plugin, String name, CommandExecutor executor) {
+        PluginCommand command = plugin.getCommand(name);
+        if (command == null) {
+            throw new IllegalStateException("plugin.yml might be corrupt.");
+        }
+
+        command.setExecutor(executor);
+    }
+}

spigot/src/main/resources/META-INF/services/com.comphenix.protocol.internal.PlatformProvider

@@ -0,0 +1 @@
+com.comphenix.protocol.spigot.SpigotPlatformProvider

spigot/src/main/resources/plugin.yml

@@ -1,7 +1,7 @@
 name: ProtocolLib
 version: ${version}
 description: Provides read/write access to the Minecraft protocol.
-authors: [dmulloy2, comphenix]
+authors: [dmulloy2]
 
 main: com.comphenix.protocol.ProtocolLib
 load: STARTUP
@@ -44,4 +44,4 @@ permissions:
     default: op
   protocol.info:
     description: Can read update notifications and error reports.
-    default: op
+    default: op

spigot/src/test/java/com/comphenix/protocol/PlatformCommandRegistrarTest.java

@@ -0,0 +1,26 @@
+package com.comphenix.protocol;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.PluginCommand;
+import org.junit.jupiter.api.Test;
+
+import com.comphenix.protocol.spigot.SpigotPlatformProvider;
+
+class PlatformCommandRegistrarTest {
+
+    @Test
+    void registersLegacyExecutorFromPluginDescriptor() {
+        ProtocolLib plugin = mock(ProtocolLib.class);
+        CommandExecutor executor = mock(CommandExecutor.class);
+        PluginCommand command = mock(PluginCommand.class);
+        when(plugin.getCommand("protocol")).thenReturn(command);
+
+        new SpigotPlatformProvider().registerCommand(plugin, "protocol", executor);
+
+        verify(command).setExecutor(executor);
+    }
+}

spigot/src/test/java/com/comphenix/protocol/injector/netty/manager/PlatformChannelInitializerTest.java

@@ -0,0 +1,17 @@
+package com.comphenix.protocol.injector.netty.manager;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+
+import org.junit.jupiter.api.Test;
+
+import com.comphenix.protocol.internal.PlatformProvider;
+class PlatformChannelInitializerTest {
+
+    @Test
+    void reportsPaperInitializerUnavailable() {
+        PlatformProvider provider = PlatformProvider.get();
+        assertInstanceOf(com.comphenix.protocol.spigot.SpigotPlatformProvider.class, provider);
+        assertFalse(provider.hasEarlyChannelInitialization());
+    }
+}

src/main/java/com/comphenix/protocol/CommandProtocol.java

@@ -120,25 +120,9 @@ class CommandProtocol extends CommandBase {
             return;
         }
 
-        // Perform on an async thread
-        Runnable notify = new Runnable() {
-            @Override
-            public void run() {
-                if (command) {
-                    sender.sendMessage(ChatColor.YELLOW + "[ProtocolLib] " + updater.getResult());
-                    String remoteVersion = updater.getRemoteVersion();
-                    if (remoteVersion != null) {
-                        sender.sendMessage(ChatColor.YELLOW + "Remote version: " + remoteVersion);
-                        sender.sendMessage(ChatColor.YELLOW + "Current version: " + plugin.getDescription().getVersion());
-                    }
-                } else if (updater.shouldNotify() || config.isDebug()) {
-                    sender.sendMessage(ChatColor.YELLOW + "[ProtocolLib] " + updater.getResult());
-                }
-
-                updater.removeListener(this);
-                updateFinished();
-            }
-        };
+        // Top-level class instead of anonymous inner class so that PaperPluginClassLoader
+        // can resolve the .class entry when BukkitScheduler dispatches it on the main thread.
+        Runnable notify = new UpdateNotifyRunnable(sender, command, updater, config, plugin, this);
         updater.start(type);
         updater.addListener(notify);
     }

src/main/java/com/comphenix/protocol/PacketType.java

@@ -14,18 +14,18 @@ import java.util.Map;
 import java.util.UUID;
 import java.util.function.BiConsumer;
 
+import org.apache.commons.lang.WordUtils;
+import org.bukkit.Bukkit;
+
 import com.comphenix.protocol.PacketTypeLookup.ClassLookup;
 import com.comphenix.protocol.events.ConnectionSide;
 import com.comphenix.protocol.injector.packet.PacketRegistry;
 import com.comphenix.protocol.scheduler.UniversalRunnable;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.utility.MinecraftVersion;
-
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ComparisonChain;
 import com.google.common.collect.Iterables;
-import org.apache.commons.lang.WordUtils;
-import org.bukkit.Bukkit;
 /**
  * Represents the type of a packet in a specific protocol.
  * <p>
@@ -109,130 +109,148 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
 
             public static final PacketType BUNDLE =                       new PacketType(PROTOCOL, SENDER, 0x00, "BundleDelimiter", "Delimiter", "BundleDelimiterPacket");
             public static final PacketType SPAWN_ENTITY =                 new PacketType(PROTOCOL, SENDER, 0x01, "AddEntity", "SpawnEntity", "SPacketSpawnObject");
-            public static final PacketType SPAWN_ENTITY_EXPERIENCE_ORB =  new PacketType(PROTOCOL, SENDER, 0x02, "AddExperienceOrb", "SpawnEntityExperienceOrb", "SPacketSpawnExperienceOrb");
-            public static final PacketType ANIMATION =                    new PacketType(PROTOCOL, SENDER, 0x03, "Animate", "Animation", "SPacketAnimation");
-            public static final PacketType STATISTIC =                    new PacketType(PROTOCOL, SENDER, 0x04, "AwardStats", "Statistic", "SPacketStatistics");
-            public static final PacketType BLOCK_CHANGED_ACK =            new PacketType(PROTOCOL, SENDER, 0x05, "BlockChangedAck");
-            public static final PacketType BLOCK_BREAK_ANIMATION =        new PacketType(PROTOCOL, SENDER, 0x06, "BlockDestruction", "BlockBreakAnimation", "SPacketBlockBreakAnim");
-            public static final PacketType TILE_ENTITY_DATA =             new PacketType(PROTOCOL, SENDER, 0x07, "BlockEntityData", "TileEntityData", "SPacketUpdateTileEntity");
-            public static final PacketType BLOCK_ACTION =                 new PacketType(PROTOCOL, SENDER, 0x08, "BlockEvent", "BlockAction", "SPacketBlockAction");
-            public static final PacketType BLOCK_CHANGE =                 new PacketType(PROTOCOL, SENDER, 0x09, "BlockUpdate", "BlockChange", "SPacketBlockChange");
-            public static final PacketType BOSS =                         new PacketType(PROTOCOL, SENDER, 0x0A, "BossEvent", "Boss", "SPacketUpdateBossInfo");
-            public static final PacketType SERVER_DIFFICULTY =            new PacketType(PROTOCOL, SENDER, 0x0B, "ChangeDifficulty", "ServerDifficulty", "SPacketServerDifficulty");
-            public static final PacketType CHUNK_BATCH_FINISHED =         new PacketType(PROTOCOL, SENDER, 0x0C, "ChunkBatchFinished");
-            public static final PacketType CHUNK_BATCH_START =            new PacketType(PROTOCOL, SENDER, 0x0D, "ChunkBatchStart");
-            public static final PacketType CHUNKS_BIOMES =                new PacketType(PROTOCOL, SENDER, 0x0E, "ChunksBiomes", "ClientboundChunksBiomesPacket");
-            public static final PacketType CLEAR_TITLES =                 new PacketType(PROTOCOL, SENDER, 0x0F, "ClearTitles");
-            public static final PacketType TAB_COMPLETE =                 new PacketType(PROTOCOL, SENDER, 0x10, "CommandSuggestions", "TabComplete", "SPacketTabComplete");
-            public static final PacketType COMMANDS =                     new PacketType(PROTOCOL, SENDER, 0x11, "Commands");
-            public static final PacketType CLOSE_WINDOW =                 new PacketType(PROTOCOL, SENDER, 0x12, "ContainerClose", "CloseWindow", "SPacketCloseWindow");
-            public static final PacketType WINDOW_ITEMS =                 new PacketType(PROTOCOL, SENDER, 0x13, "ContainerSetContent", "WindowItems", "SPacketWindowItems");
-            public static final PacketType WINDOW_DATA =                  new PacketType(PROTOCOL, SENDER, 0x14, "ContainerSetData", "WindowData", "SPacketWindowProperty");
-            public static final PacketType SET_SLOT =                     new PacketType(PROTOCOL, SENDER, 0x15, "ContainerSetSlot", "SetSlot", "SPacketSetSlot");
-            public static final PacketType COOKIE_REQUEST =               new PacketType(PROTOCOL, SENDER, 0x16, "CookieRequest");
-            public static final PacketType SET_COOLDOWN =                 new PacketType(PROTOCOL, SENDER, 0x17, "Cooldown", "SetCooldown", "SPacketCooldown");
-            public static final PacketType CUSTOM_CHAT_COMPLETIONS =      new PacketType(PROTOCOL, SENDER, 0x18, "CustomChatCompletions");
-            public static final PacketType CUSTOM_PAYLOAD =               new PacketType(PROTOCOL, SENDER, 0x19, "CustomPayload", "SPacketCustomPayload");
-            public static final PacketType DAMAGE_EVENT =                 new PacketType(PROTOCOL, SENDER, 0x1A, "DamageEvent", "ClientboundDamageEventPacket");
-            public static final PacketType DEBUG_SAMPLE =                 new PacketType(PROTOCOL, SENDER, 0x1B, "DebugSample");
-            public static final PacketType DELETE_CHAT_MESSAGE =          new PacketType(PROTOCOL, SENDER, 0x1C, "DeleteChat");
-            public static final PacketType KICK_DISCONNECT =              new PacketType(PROTOCOL, SENDER, 0x1D, "Disconnect", "KickDisconnect", "SPacketDisconnect");
-            public static final PacketType DISGUISED_CHAT =               new PacketType(PROTOCOL, SENDER, 0x1E, "DisguisedChat");
-            public static final PacketType ENTITY_STATUS =                new PacketType(PROTOCOL, SENDER, 0x1F, "EntityEvent", "EntityStatus", "SPacketEntityStatus");
-            public static final PacketType EXPLOSION =                    new PacketType(PROTOCOL, SENDER, 0x20, "Explode", "Explosion", "SPacketExplosion");
-            public static final PacketType UNLOAD_CHUNK =                 new PacketType(PROTOCOL, SENDER, 0x21, "ForgetLevelChunk", "UnloadChunk", "SPacketUnloadChunk");
-            public static final PacketType GAME_STATE_CHANGE =            new PacketType(PROTOCOL, SENDER, 0x22, "GameEvent", "GameStateChange", "SPacketChangeGameState");
-            public static final PacketType OPEN_WINDOW_HORSE =            new PacketType(PROTOCOL, SENDER, 0x23, "HorseScreenOpen", "OpenWindowHorse");
-            public static final PacketType HURT_ANIMATION =               new PacketType(PROTOCOL, SENDER, 0x24, "HurtAnimation", "ClientboundHurtAnimationPacket");
-            public static final PacketType INITIALIZE_BORDER =            new PacketType(PROTOCOL, SENDER, 0x25, "InitializeBorder");
-            public static final PacketType KEEP_ALIVE =                   new PacketType(PROTOCOL, SENDER, 0x26, "KeepAlive", "SPacketKeepAlive");
-            public static final PacketType MAP_CHUNK =                    new PacketType(PROTOCOL, SENDER, 0x27, "LevelChunkWithLight", "MapChunk", "SPacketChunkData");
-            public static final PacketType WORLD_EVENT =                  new PacketType(PROTOCOL, SENDER, 0x28, "LevelEvent", "WorldEvent", "SPacketEffect");
-            public static final PacketType WORLD_PARTICLES =              new PacketType(PROTOCOL, SENDER, 0x29, "LevelParticles", "WorldParticles", "SPacketParticles");
-            public static final PacketType LIGHT_UPDATE =                 new PacketType(PROTOCOL, SENDER, 0x2A, "LightUpdate");
-            public static final PacketType LOGIN =                        new PacketType(PROTOCOL, SENDER, 0x2B, "Login", "SPacketJoinGame");
-            public static final PacketType MAP =                          new PacketType(PROTOCOL, SENDER, 0x2C, "MapItemData", "Map", "SPacketMaps");
-            public static final PacketType OPEN_WINDOW_MERCHANT =         new PacketType(PROTOCOL, SENDER, 0x2D, "MerchantOffers", "OpenWindowMerchant");
-            public static final PacketType REL_ENTITY_MOVE =              new PacketType(PROTOCOL, SENDER, 0x2E, "net.minecraft.network.protocol.game.ClientboundMoveEntityPacket$Pos", "Entity$RelEntityMove", "Entity$PacketPlayOutRelEntityMove");
-            public static final PacketType REL_ENTITY_MOVE_LOOK =         new PacketType(PROTOCOL, SENDER, 0x2F, "net.minecraft.network.protocol.game.ClientboundMoveEntityPacket$PosRot", "Entity$RelEntityMoveLook", "Entity$PacketPlayOutRelEntityMoveLook");
-            public static final PacketType ENTITY_LOOK =                  new PacketType(PROTOCOL, SENDER, 0x30, "net.minecraft.network.protocol.game.ClientboundMoveEntityPacket$Rot", "Entity$EntityLook", "Entity$PacketPlayOutEntityLook");
-            public static final PacketType VEHICLE_MOVE =                 new PacketType(PROTOCOL, SENDER, 0x31, "MoveVehicle", "VehicleMove", "SPacketMoveVehicle");
-            public static final PacketType OPEN_BOOK =                    new PacketType(PROTOCOL, SENDER, 0x32, "OpenBook");
-            public static final PacketType OPEN_WINDOW =                  new PacketType(PROTOCOL, SENDER, 0x33, "OpenScreen", "OpenWindow", "SPacketOpenWindow");
-            public static final PacketType OPEN_SIGN_EDITOR =             new PacketType(PROTOCOL, SENDER, 0x34, "OpenSignEditor", "SPacketSignEditorOpen");
-            public static final PacketType PING =                         new PacketType(PROTOCOL, SENDER, 0x35, "Ping");
-            public static final PacketType PONG_RESPONSE =                new PacketType(PROTOCOL, SENDER, 0x36, "PongResponse");
-            public static final PacketType AUTO_RECIPE =                  new PacketType(PROTOCOL, SENDER, 0x37, "PlaceGhostRecipe", "AutoRecipe", "SPacketPlaceGhostRecipe");
-            public static final PacketType ABILITIES =                    new PacketType(PROTOCOL, SENDER, 0x38, "PlayerAbilities", "Abilities", "SPacketPlayerAbilities");
-            public static final PacketType CHAT =                         new PacketType(PROTOCOL, SENDER, 0x39, "PlayerChat", "Chat", "SPacketChat");
-            public static final PacketType PLAYER_COMBAT_END =            new PacketType(PROTOCOL, SENDER, 0x3A, "PlayerCombatEnd");
-            public static final PacketType PLAYER_COMBAT_ENTER =          new PacketType(PROTOCOL, SENDER, 0x3B, "PlayerCombatEnter");
-            public static final PacketType PLAYER_COMBAT_KILL =           new PacketType(PROTOCOL, SENDER, 0x3C, "PlayerCombatKill");
-            public static final PacketType PLAYER_INFO_REMOVE =           new PacketType(PROTOCOL, SENDER, 0x3D, "PlayerInfoRemove");
-            public static final PacketType PLAYER_INFO =                  new PacketType(PROTOCOL, SENDER, 0x3E, "PlayerInfoUpdate", "PlayerInfo");
-            public static final PacketType LOOK_AT =                      new PacketType(PROTOCOL, SENDER, 0x3F, "PlayerLookAt", "LookAt", "SPacketPlayerPosLook");
-            public static final PacketType POSITION =                     new PacketType(PROTOCOL, SENDER, 0x40, "PlayerPosition", "Position");
-            public static final PacketType RECIPES =                      new PacketType(PROTOCOL, SENDER, 0x41, "Recipe", "Recipes", "SPacketRecipeBook");
-            public static final PacketType ENTITY_DESTROY =               new PacketType(PROTOCOL, SENDER, 0x42, "RemoveEntities", "EntityDestroy", "SPacketDestroyEntities");
-            public static final PacketType REMOVE_ENTITY_EFFECT =         new PacketType(PROTOCOL, SENDER, 0x43, "RemoveMobEffect", "RemoveEntityEffect", "SPacketRemoveEntityEffect");
-            public static final PacketType RESET_SCORE =                  new PacketType(PROTOCOL, SENDER, 0x44, "ResetScore", "ResetScorePacket");
-            public static final PacketType REMOVE_RESOURCE_PACK =         new PacketType(PROTOCOL, SENDER, 0x45, "ResourcePackPop", "ResourcePackPopPacket");
-            public static final PacketType ADD_RESOURCE_PACK =            new PacketType(PROTOCOL, SENDER, 0x46, "ResourcePackPush", "ResourcePackPushPacket");
-            public static final PacketType RESPAWN =                      new PacketType(PROTOCOL, SENDER, 0x47, "Respawn", "SPacketRespawn");
-            public static final PacketType ENTITY_HEAD_ROTATION =         new PacketType(PROTOCOL, SENDER, 0x48, "RotateHead", "EntityHeadRotation", "SPacketEntityHeadLook");
-            public static final PacketType MULTI_BLOCK_CHANGE =           new PacketType(PROTOCOL, SENDER, 0x49, "SectionBlocksUpdate", "MultiBlockChange", "SPacketMultiBlockChange");
-            public static final PacketType SELECT_ADVANCEMENT_TAB =       new PacketType(PROTOCOL, SENDER, 0x4A, "SelectAdvancementsTab", "SelectAdvancementTab", "SPacketSelectAdvancementsTab");
-            public static final PacketType SERVER_DATA =                  new PacketType(PROTOCOL, SENDER, 0x4B, "ServerData");
-            public static final PacketType SET_ACTION_BAR_TEXT =          new PacketType(PROTOCOL, SENDER, 0x4C, "SetActionBarText");
-            public static final PacketType SET_BORDER_CENTER =            new PacketType(PROTOCOL, SENDER, 0x4D, "SetBorderCenter");
-            public static final PacketType SET_BORDER_LERP_SIZE =         new PacketType(PROTOCOL, SENDER, 0x4E, "SetBorderLerpSize");
-            public static final PacketType SET_BORDER_SIZE =              new PacketType(PROTOCOL, SENDER, 0x4F, "SetBorderSize");
-            public static final PacketType SET_BORDER_WARNING_DELAY =     new PacketType(PROTOCOL, SENDER, 0x50, "SetBorderWarningDelay");
-            public static final PacketType SET_BORDER_WARNING_DISTANCE =  new PacketType(PROTOCOL, SENDER, 0x51, "SetBorderWarningDistance");
-            public static final PacketType CAMERA =                       new PacketType(PROTOCOL, SENDER, 0x52, "SetCamera", "Camera", "SPacketCamera");
-            public static final PacketType HELD_ITEM_SLOT =               new PacketType(PROTOCOL, SENDER, 0x53, "SetCarriedItem", "HeldItemSlot", "SPacketHeldItemChange");
-            public static final PacketType VIEW_CENTRE =                  new PacketType(PROTOCOL, SENDER, 0x54, "SetChunkCacheCenter", "ViewCentre");
-            public static final PacketType VIEW_DISTANCE =                new PacketType(PROTOCOL, SENDER, 0x55, "SetChunkCacheRadius", "ViewDistance");
-            public static final PacketType SPAWN_POSITION =               new PacketType(PROTOCOL, SENDER, 0x56, "SetDefaultSpawnPosition", "SpawnPosition", "SPacketSpawnPosition");
-            public static final PacketType SCOREBOARD_DISPLAY_OBJECTIVE = new PacketType(PROTOCOL, SENDER, 0x57, "SetDisplayObjective", "ScoreboardDisplayObjective", "SPacketDisplayObjective");
-            public static final PacketType ENTITY_METADATA =              new PacketType(PROTOCOL, SENDER, 0x58, "SetEntityData", "EntityMetadata", "SPacketEntityMetadata");
-            public static final PacketType ATTACH_ENTITY =                new PacketType(PROTOCOL, SENDER, 0x59, "SetEntityLink", "AttachEntity", "SPacketEntityAttach");
-            public static final PacketType ENTITY_VELOCITY =              new PacketType(PROTOCOL, SENDER, 0x5A, "SetEntityMotion", "EntityVelocity", "SPacketEntityVelocity");
-            public static final PacketType ENTITY_EQUIPMENT =             new PacketType(PROTOCOL, SENDER, 0x5B, "SetEquipment", "EntityEquipment", "SPacketEntityEquipment");
-            public static final PacketType EXPERIENCE =                   new PacketType(PROTOCOL, SENDER, 0x5C, "SetExperience", "Experience", "SPacketSetExperience");
-            public static final PacketType UPDATE_HEALTH =                new PacketType(PROTOCOL, SENDER, 0x5D, "SetHealth", "UpdateHealth", "SPacketUpdateHealth");
-            public static final PacketType SCOREBOARD_OBJECTIVE =         new PacketType(PROTOCOL, SENDER, 0x5E, "SetObjective", "ScoreboardObjective", "SPacketScoreboardObjective");
-            public static final PacketType MOUNT =                        new PacketType(PROTOCOL, SENDER, 0x5F, "SetPassengers", "Mount", "SPacketSetPassengers");
-            public static final PacketType SCOREBOARD_TEAM =              new PacketType(PROTOCOL, SENDER, 0x60, "SetPlayerTeam", "ScoreboardTeam", "SPacketTeams");
-            public static final PacketType SCOREBOARD_SCORE =             new PacketType(PROTOCOL, SENDER, 0x61, "SetScore", "ScoreboardScore", "SPacketUpdateScore");
-            public static final PacketType UPDATE_SIMULATION_DISTANCE =   new PacketType(PROTOCOL, SENDER, 0x62, "SetSimulationDistance");
-            public static final PacketType SET_SUBTITLE_TEXT =            new PacketType(PROTOCOL, SENDER, 0x63, "SetSubtitleText");
-            public static final PacketType UPDATE_TIME =                  new PacketType(PROTOCOL, SENDER, 0x64, "SetTime", "UpdateTime", "SPacketTimeUpdate");
-            public static final PacketType SET_TITLE_TEXT =               new PacketType(PROTOCOL, SENDER, 0x65, "SetTitleText");
-            public static final PacketType SET_TITLES_ANIMATION =         new PacketType(PROTOCOL, SENDER, 0x66, "SetTitlesAnimation");
-            public static final PacketType ENTITY_SOUND =                 new PacketType(PROTOCOL, SENDER, 0x67, "SoundEntity", "EntitySound", "SPacketSoundEffect");
-            public static final PacketType NAMED_SOUND_EFFECT =           new PacketType(PROTOCOL, SENDER, 0x68, "Sound", "NamedSoundEffect");
-            public static final PacketType START_CONFIGURATION =          new PacketType(PROTOCOL, SENDER, 0x69, "StartConfiguration");
-            public static final PacketType STOP_SOUND =                   new PacketType(PROTOCOL, SENDER, 0x6A, "StopSound");
-            public static final PacketType STORE_COOKIE =                 new PacketType(PROTOCOL, SENDER, 0x6B, "StoreCookie");
-            public static final PacketType SYSTEM_CHAT =                  new PacketType(PROTOCOL, SENDER, 0x6C, "SystemChat");
-            public static final PacketType PLAYER_LIST_HEADER_FOOTER =    new PacketType(PROTOCOL, SENDER, 0x6D, "TabList", "PlayerListHeaderFooter", "SPacketPlayerListHeaderFooter");
-            public static final PacketType NBT_QUERY =                    new PacketType(PROTOCOL, SENDER, 0x6E, "TagQuery", "NBTQuery");
-            public static final PacketType COLLECT =                      new PacketType(PROTOCOL, SENDER, 0x6F, "TakeItemEntity", "Collect", "SPacketCollectItem");
-            public static final PacketType ENTITY_TELEPORT =              new PacketType(PROTOCOL, SENDER, 0x70, "TeleportEntity", "EntityTeleport", "SPacketEntityTeleport");
-            public static final PacketType TICKING_STATE =                new PacketType(PROTOCOL, SENDER, 0x71, "TickingState", "TickingStatePacket");
-            public static final PacketType TICKING_STEP_STATE =           new PacketType(PROTOCOL, SENDER, 0x72, "TickingStep", "TickingStepPacket");
-            public static final PacketType TRANSFER =                     new PacketType(PROTOCOL, SENDER, 0x73, "Transfer");
-            public static final PacketType ADVANCEMENTS =                 new PacketType(PROTOCOL, SENDER, 0x74, "UpdateAdvancements", "Advancements", "SPacketAdvancementInfo");
-            public static final PacketType UPDATE_ATTRIBUTES =            new PacketType(PROTOCOL, SENDER, 0x75, "UpdateAttributes", "SPacketEntityProperties");
-            public static final PacketType ENTITY_EFFECT =                new PacketType(PROTOCOL, SENDER, 0x76, "UpdateMobEffect", "EntityEffect", "SPacketEntityEffect");
-            public static final PacketType RECIPE_UPDATE =                new PacketType(PROTOCOL, SENDER, 0x77, "UpdateRecipes", "RecipeUpdate");
-            public static final PacketType TAGS =                         new PacketType(PROTOCOL, SENDER, 0x78, "UpdateTags", "Tags");
-            public static final PacketType PROJECTILE_POWER =             new PacketType(PROTOCOL, SENDER, 0x79, "ProjectilePower");
-            public static final PacketType REPORT_DETAILS =               new PacketType(PROTOCOL, SENDER, 0x7A, "CustomReportDetails");
-            public static final PacketType SERVER_LINKS =                 new PacketType(PROTOCOL, SENDER, 0x7B, "ServerLinks");
-
-            // ---- Removed in 1.9
+            public static final PacketType ANIMATION =                    new PacketType(PROTOCOL, SENDER, 0x02, "Animate", "Animation", "SPacketAnimation");
+            public static final PacketType STATISTIC =                    new PacketType(PROTOCOL, SENDER, 0x03, "AwardStats", "Statistic", "SPacketStatistics");
+            public static final PacketType BLOCK_CHANGED_ACK =            new PacketType(PROTOCOL, SENDER, 0x04, "BlockChangedAck");
+            public static final PacketType BLOCK_BREAK_ANIMATION =        new PacketType(PROTOCOL, SENDER, 0x05, "BlockDestruction", "BlockBreakAnimation", "SPacketBlockBreakAnim");
+            public static final PacketType TILE_ENTITY_DATA =             new PacketType(PROTOCOL, SENDER, 0x06, "BlockEntityData", "TileEntityData", "SPacketUpdateTileEntity");
+            public static final PacketType BLOCK_ACTION =                 new PacketType(PROTOCOL, SENDER, 0x07, "BlockEvent", "BlockAction", "SPacketBlockAction");
+            public static final PacketType BLOCK_CHANGE =                 new PacketType(PROTOCOL, SENDER, 0x08, "BlockUpdate", "BlockChange", "SPacketBlockChange");
+            public static final PacketType BOSS =                         new PacketType(PROTOCOL, SENDER, 0x09, "BossEvent", "Boss", "SPacketUpdateBossInfo");
+            public static final PacketType SERVER_DIFFICULTY =            new PacketType(PROTOCOL, SENDER, 0x0A, "ChangeDifficulty", "ServerDifficulty", "SPacketServerDifficulty");
+            public static final PacketType CHUNK_BATCH_FINISHED =         new PacketType(PROTOCOL, SENDER, 0x0B, "ChunkBatchFinished");
+            public static final PacketType CHUNK_BATCH_START =            new PacketType(PROTOCOL, SENDER, 0x0C, "ChunkBatchStart");
+            public static final PacketType CHUNKS_BIOMES =                new PacketType(PROTOCOL, SENDER, 0x0D, "ChunksBiomes", "ClientboundChunksBiomesPacket");
+            public static final PacketType CLEAR_TITLES =                 new PacketType(PROTOCOL, SENDER, 0x0E, "ClearTitles");
+            public static final PacketType TAB_COMPLETE =                 new PacketType(PROTOCOL, SENDER, 0x0F, "CommandSuggestions", "TabComplete", "SPacketTabComplete");
+            public static final PacketType COMMANDS =                     new PacketType(PROTOCOL, SENDER, 0x10, "Commands");
+            public static final PacketType CLOSE_WINDOW =                 new PacketType(PROTOCOL, SENDER, 0x11, "ContainerClose", "CloseWindow", "SPacketCloseWindow");
+            public static final PacketType WINDOW_ITEMS =                 new PacketType(PROTOCOL, SENDER, 0x12, "ContainerSetContent", "WindowItems", "SPacketWindowItems");
+            public static final PacketType WINDOW_DATA =                  new PacketType(PROTOCOL, SENDER, 0x13, "ContainerSetData", "WindowData", "SPacketWindowProperty");
+            public static final PacketType SET_SLOT =                     new PacketType(PROTOCOL, SENDER, 0x14, "ContainerSetSlot", "SetSlot", "SPacketSetSlot");
+            public static final PacketType COOKIE_REQUEST =               new PacketType(PROTOCOL, SENDER, 0x15, "CookieRequest");
+            public static final PacketType SET_COOLDOWN =                 new PacketType(PROTOCOL, SENDER, 0x16, "Cooldown", "SetCooldown", "SPacketCooldown");
+            public static final PacketType CUSTOM_CHAT_COMPLETIONS =      new PacketType(PROTOCOL, SENDER, 0x17, "CustomChatCompletions");
+            public static final PacketType CUSTOM_PAYLOAD =               new PacketType(PROTOCOL, SENDER, 0x18, "CustomPayload", "SPacketCustomPayload");
+            public static final PacketType DAMAGE_EVENT =                 new PacketType(PROTOCOL, SENDER, 0x19, "DamageEvent", "ClientboundDamageEventPacket");
+            public static final PacketType DEBUG_BLOCK_VALUE =            new PacketType(PROTOCOL, SENDER, 0x1A, "DebugBlockValue");
+            public static final PacketType DEBUG_CHUNK_VALUE =            new PacketType(PROTOCOL, SENDER, 0x1B, "DebugChunkValue");
+            public static final PacketType DEBUG_ENTITY_VALUE =           new PacketType(PROTOCOL, SENDER, 0x1C, "DebugEntityValue");
+            public static final PacketType DEBUG_EVENT =                  new PacketType(PROTOCOL, SENDER, 0x1D, "DebugEvent");
+            public static final PacketType DEBUG_SAMPLE =                 new PacketType(PROTOCOL, SENDER, 0x1E, "DebugSample");
+            public static final PacketType DELETE_CHAT_MESSAGE =          new PacketType(PROTOCOL, SENDER, 0x1F, "DeleteChat");
+            public static final PacketType KICK_DISCONNECT =              new PacketType(PROTOCOL, SENDER, 0x20, "Disconnect", "KickDisconnect", "SPacketDisconnect");
+            public static final PacketType DISGUISED_CHAT =               new PacketType(PROTOCOL, SENDER, 0x21, "DisguisedChat");
+            public static final PacketType ENTITY_STATUS =                new PacketType(PROTOCOL, SENDER, 0x22, "EntityEvent", "EntityStatus", "SPacketEntityStatus");
+            public static final PacketType ENTITY_POSITION_SYNC =         new PacketType(PROTOCOL, SENDER, 0x23, "EntityPositionSync");
+            public static final PacketType EXPLOSION =                    new PacketType(PROTOCOL, SENDER, 0x24, "Explode", "Explosion", "SPacketExplosion");
+            public static final PacketType ADD_TRANSIENT_BLOCK =          new PacketType(PROTOCOL, SENDER, 0x25, MinecraftVersion.v26_3, "AddTransientBlock");
+            public static final PacketType UNLOAD_CHUNK =                 new PacketType(PROTOCOL, SENDER, 0x26, MinecraftVersion.v26_3, "ForgetLevelChunk", "UnloadChunk", "SPacketUnloadChunk");
+            public static final PacketType GAME_STATE_CHANGE =            new PacketType(PROTOCOL, SENDER, 0x27, MinecraftVersion.v26_3, "GameEvent", "GameStateChange", "SPacketChangeGameState");
+            public static final PacketType GAME_RULE_VALUES =             new PacketType(PROTOCOL, SENDER, 0x28, MinecraftVersion.v26_3, "GameRuleValues");
+            public static final PacketType GAME_TEST_HIGHLIGHT_POS =      new PacketType(PROTOCOL, SENDER, 0x29, MinecraftVersion.v26_3, "GameTestHighlightPos");
+            public static final PacketType OPEN_WINDOW_HORSE =            new PacketType(PROTOCOL, SENDER, 0x2A, MinecraftVersion.v26_3, "MountScreenOpen", "HorseScreenOpen", "OpenWindowHorse");
+            public static final PacketType HURT_ANIMATION =               new PacketType(PROTOCOL, SENDER, 0x2B, MinecraftVersion.v26_3, "HurtAnimation", "ClientboundHurtAnimationPacket");
+            public static final PacketType INITIALIZE_BORDER =            new PacketType(PROTOCOL, SENDER, 0x2C, MinecraftVersion.v26_3, "InitializeBorder");
+            public static final PacketType KEEP_ALIVE =                   new PacketType(PROTOCOL, SENDER, 0x2D, MinecraftVersion.v26_3, "KeepAlive", "SPacketKeepAlive");
+            public static final PacketType MAP_CHUNK =                    new PacketType(PROTOCOL, SENDER, 0x2E, MinecraftVersion.v26_3, "LevelChunkWithLight", "MapChunk", "SPacketChunkData");
+            public static final PacketType WORLD_EVENT =                  new PacketType(PROTOCOL, SENDER, 0x2F, MinecraftVersion.v26_3, "LevelEvent", "WorldEvent", "SPacketEffect");
+            public static final PacketType WORLD_PARTICLES =              new PacketType(PROTOCOL, SENDER, 0x30, MinecraftVersion.v26_3, "LevelParticles", "WorldParticles", "SPacketParticles");
+            public static final PacketType LIGHT_UPDATE =                 new PacketType(PROTOCOL, SENDER, 0x31, MinecraftVersion.v26_3, "LightUpdate");
+            public static final PacketType LOGIN =                        new PacketType(PROTOCOL, SENDER, 0x32, MinecraftVersion.v26_3, "Login", "SPacketJoinGame");
+            public static final PacketType LOW_DISK_SPACE_WARNING =       new PacketType(PROTOCOL, SENDER, 0x33, MinecraftVersion.v26_3, "LowDiskSpaceWarning");
+            public static final PacketType MAP =                          new PacketType(PROTOCOL, SENDER, 0x34, MinecraftVersion.v26_3, "MapItemData", "Map", "SPacketMaps");
+            public static final PacketType OPEN_WINDOW_MERCHANT =         new PacketType(PROTOCOL, SENDER, 0x35, MinecraftVersion.v26_3, "MerchantOffers", "OpenWindowMerchant");
+            public static final PacketType REL_ENTITY_MOVE =              new PacketType(PROTOCOL, SENDER, 0x36, MinecraftVersion.v26_3, "net.minecraft.network.protocol.game.ClientboundMoveEntityPacket$Pos", "Entity$RelEntityMove", "Entity$PacketPlayOutRelEntityMove");
+            public static final PacketType REL_ENTITY_MOVE_LOOK =         new PacketType(PROTOCOL, SENDER, 0x37, MinecraftVersion.v26_3, "net.minecraft.network.protocol.game.ClientboundMoveEntityPacket$PosRot", "Entity$RelEntityMoveLook", "Entity$PacketPlayOutRelEntityMoveLook");
+            public static final PacketType MOVE_MINECART =                new PacketType(PROTOCOL, SENDER, 0x38, MinecraftVersion.v26_3, "MoveMinecart");
+            public static final PacketType ENTITY_LOOK =                  new PacketType(PROTOCOL, SENDER, 0x39, MinecraftVersion.v26_3, "net.minecraft.network.protocol.game.ClientboundMoveEntityPacket$Rot", "Entity$EntityLook", "Entity$PacketPlayOutEntityLook");
+            public static final PacketType VEHICLE_MOVE =                 new PacketType(PROTOCOL, SENDER, 0x3A, MinecraftVersion.v26_3, "MoveVehicle", "VehicleMove", "SPacketMoveVehicle");
+            public static final PacketType OPEN_BOOK =                    new PacketType(PROTOCOL, SENDER, 0x3B, MinecraftVersion.v26_3, "OpenBook");
+            public static final PacketType OPEN_WINDOW =                  new PacketType(PROTOCOL, SENDER, 0x3C, MinecraftVersion.v26_3, "OpenScreen", "OpenWindow", "SPacketOpenWindow");
+            public static final PacketType OPEN_SIGN_EDITOR =             new PacketType(PROTOCOL, SENDER, 0x3D, MinecraftVersion.v26_3, "OpenSignEditor", "SPacketSignEditorOpen");
+            public static final PacketType PING =                         new PacketType(PROTOCOL, SENDER, 0x3E, MinecraftVersion.v26_3, "Ping");
+            public static final PacketType PONG_RESPONSE =                new PacketType(PROTOCOL, SENDER, 0x3F, MinecraftVersion.v26_3, "PongResponse");
+            public static final PacketType AUTO_RECIPE =                  new PacketType(PROTOCOL, SENDER, 0x40, MinecraftVersion.v26_3, "PlaceGhostRecipe", "AutoRecipe", "SPacketPlaceGhostRecipe");
+            public static final PacketType ABILITIES =                    new PacketType(PROTOCOL, SENDER, 0x41, MinecraftVersion.v26_3, "PlayerAbilities", "Abilities", "SPacketPlayerAbilities");
+            public static final PacketType CHAT =                         new PacketType(PROTOCOL, SENDER, 0x42, MinecraftVersion.v26_3, "PlayerChat", "Chat", "SPacketChat");
+            public static final PacketType PLAYER_COMBAT_END =            new PacketType(PROTOCOL, SENDER, 0x43, MinecraftVersion.v26_3, "PlayerCombatEnd");
+            public static final PacketType PLAYER_COMBAT_ENTER =          new PacketType(PROTOCOL, SENDER, 0x44, MinecraftVersion.v26_3, "PlayerCombatEnter");
+            public static final PacketType PLAYER_COMBAT_KILL =           new PacketType(PROTOCOL, SENDER, 0x45, MinecraftVersion.v26_3, "PlayerCombatKill");
+            public static final PacketType PLAYER_INFO_REMOVE =           new PacketType(PROTOCOL, SENDER, 0x46, MinecraftVersion.v26_3, "PlayerInfoRemove");
+            public static final PacketType PLAYER_INFO =                  new PacketType(PROTOCOL, SENDER, 0x47, MinecraftVersion.v26_3, "PlayerInfoUpdate", "PlayerInfo");
+            public static final PacketType LOOK_AT =                      new PacketType(PROTOCOL, SENDER, 0x48, MinecraftVersion.v26_3, "PlayerLookAt", "LookAt", "SPacketPlayerPosLook");
+            public static final PacketType POSITION =                     new PacketType(PROTOCOL, SENDER, 0x49, MinecraftVersion.v26_3, "PlayerPosition", "Position");
+            public static final PacketType PLAYER_ROTATION =              new PacketType(PROTOCOL, SENDER, 0x4A, MinecraftVersion.v26_3, "PlayerRotation");
+            public static final PacketType RECIPE_BOOK_ADD =              new PacketType(PROTOCOL, SENDER, 0x4B, MinecraftVersion.v26_3, "RecipeBookAdd");
+            public static final PacketType RECIPE_BOOK_REMOVE =           new PacketType(PROTOCOL, SENDER, 0x4C, MinecraftVersion.v26_3, "RecipeBookRemove");
+            public static final PacketType RECIPE_BOOK_SETTINGS =         new PacketType(PROTOCOL, SENDER, 0x4D, MinecraftVersion.v26_3, "RecipeBookSettings");
+            public static final PacketType ENTITY_DESTROY =               new PacketType(PROTOCOL, SENDER, 0x4E, MinecraftVersion.v26_3, "RemoveEntities", "EntityDestroy", "SPacketDestroyEntities");
+            public static final PacketType REMOVE_ENTITY_EFFECT =         new PacketType(PROTOCOL, SENDER, 0x4F, MinecraftVersion.v26_3, "RemoveMobEffect", "RemoveEntityEffect", "SPacketRemoveEntityEffect");
+            public static final PacketType RESET_SCORE =                  new PacketType(PROTOCOL, SENDER, 0x50, MinecraftVersion.v26_3, "ResetScore", "ResetScorePacket");
+            public static final PacketType REMOVE_RESOURCE_PACK =         new PacketType(PROTOCOL, SENDER, 0x51, MinecraftVersion.v26_3, "ResourcePackPop", "ResourcePackPopPacket");
+            public static final PacketType ADD_RESOURCE_PACK =            new PacketType(PROTOCOL, SENDER, 0x52, MinecraftVersion.v26_3, "ResourcePackPush", "ResourcePackPushPacket");
+            public static final PacketType POST_EFFECTS =                 new PacketType(PROTOCOL, SENDER, 0x53, MinecraftVersion.v26_3, "PostEffects");
+            public static final PacketType RESPAWN =                      new PacketType(PROTOCOL, SENDER, 0x54, MinecraftVersion.v26_3, "Respawn", "SPacketRespawn");
+            public static final PacketType ENTITY_HEAD_ROTATION =         new PacketType(PROTOCOL, SENDER, 0x55, MinecraftVersion.v26_3, "RotateHead", "EntityHeadRotation", "SPacketEntityHeadLook");
+            public static final PacketType MULTI_BLOCK_CHANGE =           new PacketType(PROTOCOL, SENDER, 0x56, MinecraftVersion.v26_3, "SectionBlocksUpdate", "MultiBlockChange", "SPacketMultiBlockChange");
+            public static final PacketType SELECT_ADVANCEMENT_TAB =       new PacketType(PROTOCOL, SENDER, 0x57, MinecraftVersion.v26_3, "SelectAdvancementsTab", "SelectAdvancementTab", "SPacketSelectAdvancementsTab");
+            public static final PacketType SERVER_DATA =                  new PacketType(PROTOCOL, SENDER, 0x58, MinecraftVersion.v26_3, "ServerData");
+            public static final PacketType SET_ACTION_BAR_TEXT =          new PacketType(PROTOCOL, SENDER, 0x59, MinecraftVersion.v26_3, "SetActionBarText");
+            public static final PacketType SET_BORDER_CENTER =            new PacketType(PROTOCOL, SENDER, 0x5A, MinecraftVersion.v26_3, "SetBorderCenter");
+            public static final PacketType SET_BORDER_LERP_SIZE =         new PacketType(PROTOCOL, SENDER, 0x5B, MinecraftVersion.v26_3, "SetBorderLerpSize");
+            public static final PacketType SET_BORDER_SIZE =              new PacketType(PROTOCOL, SENDER, 0x5C, MinecraftVersion.v26_3, "SetBorderSize");
+            public static final PacketType SET_BORDER_WARNING_DELAY =     new PacketType(PROTOCOL, SENDER, 0x5D, MinecraftVersion.v26_3, "SetBorderWarningDelay");
+            public static final PacketType SET_BORDER_WARNING_DISTANCE =  new PacketType(PROTOCOL, SENDER, 0x5E, MinecraftVersion.v26_3, "SetBorderWarningDistance");
+            public static final PacketType CAMERA =                       new PacketType(PROTOCOL, SENDER, 0x5F, MinecraftVersion.v26_3, "SetCamera", "Camera", "SPacketCamera");
+            public static final PacketType VIEW_CENTRE =                  new PacketType(PROTOCOL, SENDER, 0x60, MinecraftVersion.v26_3, "SetChunkCacheCenter", "ViewCentre");
+            public static final PacketType VIEW_DISTANCE =                new PacketType(PROTOCOL, SENDER, 0x61, MinecraftVersion.v26_3, "SetChunkCacheRadius", "ViewDistance");
+            public static final PacketType SET_CURSOR_ITEM =              new PacketType(PROTOCOL, SENDER, 0x62, MinecraftVersion.v26_3, "SetCursorItem");
+            public static final PacketType SPAWN_POSITION =               new PacketType(PROTOCOL, SENDER, 0x63, MinecraftVersion.v26_3, "SetDefaultSpawnPosition", "SpawnPosition", "SPacketSpawnPosition");
+            public static final PacketType SCOREBOARD_DISPLAY_OBJECTIVE = new PacketType(PROTOCOL, SENDER, 0x64, MinecraftVersion.v26_3, "SetDisplayObjective", "ScoreboardDisplayObjective", "SPacketDisplayObjective");
+            public static final PacketType ENTITY_METADATA =              new PacketType(PROTOCOL, SENDER, 0x65, MinecraftVersion.v26_3, "SetEntityData", "EntityMetadata", "SPacketEntityMetadata");
+            public static final PacketType ATTACH_ENTITY =                new PacketType(PROTOCOL, SENDER, 0x66, MinecraftVersion.v26_3, "SetEntityLink", "AttachEntity", "SPacketEntityAttach");
+            public static final PacketType ENTITY_VELOCITY =              new PacketType(PROTOCOL, SENDER, 0x67, MinecraftVersion.v26_3, "SetEntityMotion", "EntityVelocity", "SPacketEntityVelocity");
+            public static final PacketType ENTITY_EQUIPMENT =             new PacketType(PROTOCOL, SENDER, 0x68, MinecraftVersion.v26_3, "SetEquipment", "EntityEquipment", "SPacketEntityEquipment");
+            public static final PacketType EXPERIENCE =                   new PacketType(PROTOCOL, SENDER, 0x69, MinecraftVersion.v26_3, "SetExperience", "Experience", "SPacketSetExperience");
+            public static final PacketType UPDATE_HEALTH =                new PacketType(PROTOCOL, SENDER, 0x6A, MinecraftVersion.v26_3, "SetHealth", "UpdateHealth", "SPacketUpdateHealth");
+            public static final PacketType HELD_ITEM_SLOT =               new PacketType(PROTOCOL, SENDER, 0x6B, MinecraftVersion.v26_3, "SetHeldSlot", "SetCarriedItem", "HeldItemSlot", "SPacketHeldItemChange");
+            public static final PacketType SCOREBOARD_OBJECTIVE =         new PacketType(PROTOCOL, SENDER, 0x6C, MinecraftVersion.v26_3, "SetObjective", "ScoreboardObjective", "SPacketScoreboardObjective");
+            public static final PacketType MOUNT =                        new PacketType(PROTOCOL, SENDER, 0x6D, MinecraftVersion.v26_3, "SetPassengers", "Mount", "SPacketSetPassengers");
+            public static final PacketType SET_PLAYER_INVENTORY =         new PacketType(PROTOCOL, SENDER, 0x6E, MinecraftVersion.v26_3, "SetPlayerInventory");
+            public static final PacketType SCOREBOARD_TEAM =              new PacketType(PROTOCOL, SENDER, 0x6F, MinecraftVersion.v26_3, "SetPlayerTeam", "ScoreboardTeam", "SPacketTeams");
+            public static final PacketType SCOREBOARD_SCORE =             new PacketType(PROTOCOL, SENDER, 0x70, MinecraftVersion.v26_3, "SetScore", "ScoreboardScore", "SPacketUpdateScore");
+            public static final PacketType UPDATE_SIMULATION_DISTANCE =   new PacketType(PROTOCOL, SENDER, 0x71, MinecraftVersion.v26_3, "SetSimulationDistance");
+            public static final PacketType SET_SUBTITLE_TEXT =            new PacketType(PROTOCOL, SENDER, 0x72, MinecraftVersion.v26_3, "SetSubtitleText");
+            public static final PacketType UPDATE_TIME =                  new PacketType(PROTOCOL, SENDER, 0x73, MinecraftVersion.v26_3, "SetTime", "UpdateTime", "SPacketTimeUpdate");
+            public static final PacketType SET_TITLE_TEXT =               new PacketType(PROTOCOL, SENDER, 0x74, MinecraftVersion.v26_3, "SetTitleText");
+            public static final PacketType SET_TITLES_ANIMATION =         new PacketType(PROTOCOL, SENDER, 0x75, MinecraftVersion.v26_3, "SetTitlesAnimation");
+            public static final PacketType ENTITY_SOUND =                 new PacketType(PROTOCOL, SENDER, 0x76, MinecraftVersion.v26_3, "SoundEntity", "EntitySound", "SPacketSoundEffect");
+            public static final PacketType NAMED_SOUND_EFFECT =           new PacketType(PROTOCOL, SENDER, 0x77, MinecraftVersion.v26_3, "Sound", "NamedSoundEffect");
+            public static final PacketType START_CONFIGURATION =          new PacketType(PROTOCOL, SENDER, 0x78, MinecraftVersion.v26_3, "StartConfiguration");
+            public static final PacketType STOP_SOUND =                   new PacketType(PROTOCOL, SENDER, 0x79, MinecraftVersion.v26_3, "StopSound");
+            public static final PacketType STORE_COOKIE =                 new PacketType(PROTOCOL, SENDER, 0x7A, MinecraftVersion.v26_3, "StoreCookie");
+            public static final PacketType SWING_ANIMATION =              new PacketType(PROTOCOL, SENDER, 0x7B, MinecraftVersion.v26_3, "SwingAnimation");
+            public static final PacketType SYSTEM_CHAT =                  new PacketType(PROTOCOL, SENDER, 0x7C, MinecraftVersion.v26_3, "SystemChat");
+            public static final PacketType PLAYER_LIST_HEADER_FOOTER =    new PacketType(PROTOCOL, SENDER, 0x7D, MinecraftVersion.v26_3, "TabList", "PlayerListHeaderFooter", "SPacketPlayerListHeaderFooter");
+            public static final PacketType NBT_QUERY =                    new PacketType(PROTOCOL, SENDER, 0x7E, MinecraftVersion.v26_3, "TagQuery", "NBTQuery");
+            public static final PacketType COLLECT =                      new PacketType(PROTOCOL, SENDER, 0x7F, MinecraftVersion.v26_3, "TakeItemEntity", "Collect", "SPacketCollectItem");
+            public static final PacketType ENTITY_TELEPORT =              new PacketType(PROTOCOL, SENDER, 0x80, MinecraftVersion.v26_3, "TeleportEntity", "EntityTeleport", "SPacketEntityTeleport");
+            public static final PacketType TEST_INSTANCE_BLOCK_STATUS =   new PacketType(PROTOCOL, SENDER, 0x81, MinecraftVersion.v26_3, "ClientboundTestInstanceBlockStatus");
+            public static final PacketType TICKING_STATE =                new PacketType(PROTOCOL, SENDER, 0x82, MinecraftVersion.v26_3, "TickingState", "TickingStatePacket");
+            public static final PacketType TICKING_STEP_STATE =           new PacketType(PROTOCOL, SENDER, 0x83, MinecraftVersion.v26_3, "TickingStep", "TickingStepPacket");
+            public static final PacketType TRANSFER =                     new PacketType(PROTOCOL, SENDER, 0x84, MinecraftVersion.v26_3, "Transfer");
+            public static final PacketType ADVANCEMENTS =                 new PacketType(PROTOCOL, SENDER, 0x85, MinecraftVersion.v26_3, "UpdateAdvancements", "Advancements", "SPacketAdvancementInfo");
+            public static final PacketType UPDATE_ATTRIBUTES =            new PacketType(PROTOCOL, SENDER, 0x86, MinecraftVersion.v26_3, "UpdateAttributes", "SPacketEntityProperties");
+            public static final PacketType ENTITY_EFFECT =                new PacketType(PROTOCOL, SENDER, 0x87, MinecraftVersion.v26_3, "UpdateMobEffect", "EntityEffect", "SPacketEntityEffect");
+            public static final PacketType RECIPE_UPDATE =                new PacketType(PROTOCOL, SENDER, 0x88, MinecraftVersion.v26_3, "UpdateRecipes", "RecipeUpdate");
+            public static final PacketType TAGS =                         new PacketType(PROTOCOL, SENDER, 0x89, MinecraftVersion.v26_3, "UpdateTags", "Tags");
+            public static final PacketType PROJECTILE_POWER =             new PacketType(PROTOCOL, SENDER, 0x8A, MinecraftVersion.v26_3, "ProjectilePower");
+            public static final PacketType REPORT_DETAILS =               new PacketType(PROTOCOL, SENDER, 0x8B, MinecraftVersion.v26_3, "CustomReportDetails");
+            public static final PacketType SERVER_LINKS =                 new PacketType(PROTOCOL, SENDER, 0x8C, MinecraftVersion.v26_3, "ServerLinks");
+            public static final PacketType TRACKED_WAYPOINT =             new PacketType(PROTOCOL, SENDER, 0x8D, MinecraftVersion.v26_3, "TrackedWaypoint");
+            public static final PacketType CLEAR_DIALOG =                 new PacketType(PROTOCOL, SENDER, 0x8E, MinecraftVersion.v26_3, "ClearDialog");
+            public static final PacketType SHOW_DIALOG =                  new PacketType(PROTOCOL, SENDER, 0x8F, MinecraftVersion.v26_3, "ShowDialog");
 
             /**
              * @deprecated Removed in 1.9
@@ -252,8 +270,6 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             @Deprecated
             public static final PacketType UPDATE_ENTITY_NBT =           new PacketType(PROTOCOL, SENDER, 253, "UpdateEntityNBT");
 
-            // ----- Renamed packets
-
             /**
              * @deprecated Renamed to {@link #WINDOW_DATA}
              */
@@ -278,8 +294,6 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             @Deprecated
             public static final PacketType OPEN_SIGN_ENTITY =             OPEN_SIGN_EDITOR.clone();
 
-            // ----- Replaced in 1.9.4
-
             /**
              * @deprecated Replaced by {@link #TILE_ENTITY_DATA}
              */
@@ -287,8 +301,6 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             public static final PacketType UPDATE_SIGN =                  MinecraftReflection.signUpdateExists() ? new PacketType(PROTOCOL, SENDER, 252, "UpdateSign") :
                                                                               TILE_ENTITY_DATA.clone();
 
-            // ---- Removed in 1.14
-
             /**
              * @deprecated Removed in 1.14
              */
@@ -403,6 +415,18 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             @Deprecated
             public static final PacketType RESOURCE_PACK_SEND =           new PacketType(PROTOCOL, SENDER, 234, "ResourcePackSend", "SPacketResourcePackSend");
 
+            /**
+             * @deprecated Removed in 1.21.2: replaced with individual packets for adding/removing recipes
+             */
+            @Deprecated
+            public static final PacketType RECIPES =                      new PacketType(PROTOCOL, SENDER, 233, "Recipe", "Recipes", "SPacketRecipeBook");
+
+            /**
+             * @deprecated Removed in 1.21.5; replace by SPAWN_ENTITY
+             */
+            @Deprecated
+            public static final PacketType SPAWN_ENTITY_EXPERIENCE_ORB =  new PacketType(PROTOCOL, SENDER, 232, "AddExperienceOrb", "SpawnEntityExperienceOrb", "SPacketSpawnExperienceOrb");
+
             private static final Server INSTANCE = new Server();
 
             // Prevent accidental construction
@@ -424,63 +448,74 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             private static final Sender SENDER = Sender.CLIENT;
 
             public static final PacketType TELEPORT_ACCEPT =              new PacketType(PROTOCOL, SENDER, 0x00, "AcceptTeleportation", "TeleportAccept", "CPacketConfirmTeleport");
-            public static final PacketType TILE_NBT_QUERY =               new PacketType(PROTOCOL, SENDER, 0x01, "BlockEntityTagQuery", "TileNBTQuery");
-            public static final PacketType DIFFICULTY_CHANGE =            new PacketType(PROTOCOL, SENDER, 0x02, "ChangeDifficulty", "DifficultyChange");
-            public static final PacketType CHAT_ACK =                     new PacketType(PROTOCOL, SENDER, 0x03, "ChatAck");
-            public static final PacketType CHAT_COMMAND =                 new PacketType(PROTOCOL, SENDER, 0x04, "ChatCommand");
-            public static final PacketType CHAT_COMMAND_SIGNED =          new PacketType(PROTOCOL, SENDER, 0x05, "ChatCommandSigned");
-            public static final PacketType CHAT =                         new PacketType(PROTOCOL, SENDER, 0x06, "Chat", "CPacketChatMessage");
-            public static final PacketType CHAT_SESSION_UPDATE =          new PacketType(PROTOCOL, SENDER, 0x07, "ChatSessionUpdate");
-            public static final PacketType CHUNK_BATCH_RECEIVED =         new PacketType(PROTOCOL, SENDER, 0x08, "ChunkBatchReceived");
-            public static final PacketType CLIENT_COMMAND =               new PacketType(PROTOCOL, SENDER, 0x09, "ClientCommand", "CPacketClientStatus");
-            public static final PacketType SETTINGS =                     new PacketType(PROTOCOL, SENDER, 0x0A, "ClientInformation", "Settings", "CPacketClientSettings");
-            public static final PacketType TAB_COMPLETE =                 new PacketType(PROTOCOL, SENDER, 0x0B, "CommandSuggestion", "TabComplete", "CPacketTabComplete");
-            public static final PacketType CONFIGURATION_ACK =            new PacketType(PROTOCOL, SENDER, 0x0C, "ConfigurationAcknowledged");
-            public static final PacketType ENCHANT_ITEM =                 new PacketType(PROTOCOL, SENDER, 0x0D, "ContainerButtonClick", "EnchantItem", "CPacketEnchantItem");
-            public static final PacketType WINDOW_CLICK =                 new PacketType(PROTOCOL, SENDER, 0x0E, "ContainerClick", "WindowClick", "CPacketClickWindow");
-            public static final PacketType CLOSE_WINDOW =                 new PacketType(PROTOCOL, SENDER, 0x0F, "ContainerClose", "CloseWindow", "CPacketCloseWindow");
-            public static final PacketType CONTAINER_SLOT_STATE_CHANGED = new PacketType(PROTOCOL, SENDER, 0x10, "ContainerSlotStateChanged", "ContainerSlotStateChangedPacket");
-            public static final PacketType COOKIE_RESPONSE =              new PacketType(PROTOCOL, SENDER, 0x11, "CookieResponse");
-            public static final PacketType CUSTOM_PAYLOAD =               new PacketType(PROTOCOL, SENDER, 0x12, "CustomPayload", "CPacketCustomPayload");
-            public static final PacketType DEBUG_SAMPLE_SUBSCRIPTION =    new PacketType(PROTOCOL, SENDER, 0x13, "DebugSampleSubscription");
-            public static final PacketType B_EDIT =                       new PacketType(PROTOCOL, SENDER, 0x14, "EditBook", "BEdit");
-            public static final PacketType ENTITY_NBT_QUERY =             new PacketType(PROTOCOL, SENDER, 0x15, "EntityTagQuery", "EntityNBTQuery");
-            public static final PacketType USE_ENTITY =                   new PacketType(PROTOCOL, SENDER, 0x16, "Interact", "UseEntity", "CPacketUseEntity");
-            public static final PacketType JIGSAW_GENERATE =              new PacketType(PROTOCOL, SENDER, 0x17, "JigsawGenerate");
-            public static final PacketType KEEP_ALIVE =                   new PacketType(PROTOCOL, SENDER, 0x18, "KeepAlive", "CPacketKeepAlive");
-            public static final PacketType DIFFICULTY_LOCK =              new PacketType(PROTOCOL, SENDER, 0x19, "LockDifficulty", "DifficultyLock");
-            public static final PacketType POSITION =                     new PacketType(PROTOCOL, SENDER, 0x1A, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$Pos", "Flying$Position", "Flying$PacketPlayInPosition", "CPacketPlayer$Position");
-            public static final PacketType POSITION_LOOK =                new PacketType(PROTOCOL, SENDER, 0x1B, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$PosRot", "Flying$PositionLook", "Flying$PacketPlayInPositionLook", "CPacketPlayer$PositionRotation");
-            public static final PacketType LOOK =                         new PacketType(PROTOCOL, SENDER, 0x1C, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$Rot", "Flying$Look", "Flying$PacketPlayInLook", "CPacketPlayer$Rotation");
-            public static final PacketType GROUND =                       new PacketType(PROTOCOL, SENDER, 0x1D, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$StatusOnly", "Flying$d");
-            public static final PacketType VEHICLE_MOVE =                 new PacketType(PROTOCOL, SENDER, 0x1E, "MoveVehicle", "VehicleMove", "CPacketVehicleMove");
-            public static final PacketType BOAT_MOVE =                    new PacketType(PROTOCOL, SENDER, 0x1F, "PaddleBoat", "BoatMove", "CPacketSteerBoat");
-            public static final PacketType PICK_ITEM =                    new PacketType(PROTOCOL, SENDER, 0x20, "PickItem");
-            public static final PacketType PING_REQUEST =                 new PacketType(PROTOCOL, SENDER, 0x21, "PingRequest");
-            public static final PacketType AUTO_RECIPE =                  new PacketType(PROTOCOL, SENDER, 0x22, "PlaceRecipe", "AutoRecipe", "CPacketPlaceRecipe");
-            public static final PacketType ABILITIES =                    new PacketType(PROTOCOL, SENDER, 0x23, "PlayerAbilities", "Abilities", "CPacketPlayerAbilities");
-            public static final PacketType BLOCK_DIG =                    new PacketType(PROTOCOL, SENDER, 0x24, "PlayerAction", "BlockDig", "CPacketPlayerDigging");
-            public static final PacketType ENTITY_ACTION =                new PacketType(PROTOCOL, SENDER, 0x25, "PlayerCommand", "EntityAction", "CPacketEntityAction");
-            public static final PacketType STEER_VEHICLE =                new PacketType(PROTOCOL, SENDER, 0x26, "PlayerInput", "SteerVehicle", "CPacketInput");
-            public static final PacketType PONG =                         new PacketType(PROTOCOL, SENDER, 0x27, "Pong");
-            public static final PacketType RECIPE_SETTINGS =              new PacketType(PROTOCOL, SENDER, 0x28, "RecipeBookChangeSettings", "RecipeSettings");
-            public static final PacketType RECIPE_DISPLAYED =             new PacketType(PROTOCOL, SENDER, 0x29, "RecipeBookSeenRecipe", "RecipeDisplayed", "CPacketRecipeInfo");
-            public static final PacketType ITEM_NAME =                    new PacketType(PROTOCOL, SENDER, 0x2A, "RenameItem", "ItemName");
-            public static final PacketType RESOURCE_PACK_STATUS =         new PacketType(PROTOCOL, SENDER, 0x2B, "ResourcePack", "ResourcePackStatus", "CPacketResourcePackStatus");
-            public static final PacketType ADVANCEMENTS =                 new PacketType(PROTOCOL, SENDER, 0x2C, "SeenAdvancements", "Advancements", "CPacketSeenAdvancements");
-            public static final PacketType TR_SEL =                       new PacketType(PROTOCOL, SENDER, 0x2D, "SelectTrade", "TrSel");
-            public static final PacketType BEACON =                       new PacketType(PROTOCOL, SENDER, 0x2E, "SetBeacon", "Beacon");
-            public static final PacketType HELD_ITEM_SLOT =               new PacketType(PROTOCOL, SENDER, 0x2F, "SetCarriedItem", "HeldItemSlot", "CPacketHeldItemChange");
-            public static final PacketType SET_COMMAND_BLOCK =            new PacketType(PROTOCOL, SENDER, 0x30, "SetCommandBlock");
-            public static final PacketType SET_COMMAND_MINECART =         new PacketType(PROTOCOL, SENDER, 0x31, "SetCommandMinecart");
-            public static final PacketType SET_CREATIVE_SLOT =            new PacketType(PROTOCOL, SENDER, 0x32, "SetCreativeModeSlot", "SetCreativeSlot", "CPacketCreativeInventoryAction");
-            public static final PacketType SET_JIGSAW =                   new PacketType(PROTOCOL, SENDER, 0x33, "SetJigsawBlock", "SetJigsaw");
-            public static final PacketType STRUCT =                       new PacketType(PROTOCOL, SENDER, 0x34, "SetStructureBlock", "Struct");
-            public static final PacketType UPDATE_SIGN =                  new PacketType(PROTOCOL, SENDER, 0x35, "SignUpdate", "UpdateSign", "CPacketUpdateSign");
-            public static final PacketType ARM_ANIMATION =                new PacketType(PROTOCOL, SENDER, 0x36, "Swing", "ArmAnimation", "CPacketAnimation");
-            public static final PacketType SPECTATE =                     new PacketType(PROTOCOL, SENDER, 0x37, "TeleportToEntity", "Spectate", "CPacketSpectate");
-            public static final PacketType USE_ITEM_ON =                  new PacketType(PROTOCOL, SENDER, 0x38, "UseItemOn", "BlockPlace", "CPacketPlayerTryUseItemOnBlock");
-            public static final PacketType USE_ITEM =                     new PacketType(PROTOCOL, SENDER, 0x39, "UseItem", "CPacketPlayerTryUseItem");
+            public static final PacketType ATTACK =                       new PacketType(PROTOCOL, SENDER, 0x01, "Attack");
+            public static final PacketType TILE_NBT_QUERY =               new PacketType(PROTOCOL, SENDER, 0x02, "BlockEntityTagQuery", "TileNBTQuery");
+            public static final PacketType SELECT_BUNDLE_ITEM =           new PacketType(PROTOCOL, SENDER, 0x03, "SelectBundleItem");
+            public static final PacketType DIFFICULTY_CHANGE =            new PacketType(PROTOCOL, SENDER, 0x04, "ChangeDifficulty", "DifficultyChange");
+            public static final PacketType CHANGE_GAME_MODE =             new PacketType(PROTOCOL, SENDER, 0x05, "ChangeGameMode");
+            public static final PacketType CHAT_ACK =                     new PacketType(PROTOCOL, SENDER, 0x06, "ChatAck");
+            public static final PacketType CHAT_COMMAND =                 new PacketType(PROTOCOL, SENDER, 0x07, "ChatCommand");
+            public static final PacketType CHAT_COMMAND_SIGNED =          new PacketType(PROTOCOL, SENDER, 0x08, "ChatCommandSigned");
+            public static final PacketType CHAT =                         new PacketType(PROTOCOL, SENDER, 0x09, "Chat", "CPacketChatMessage");
+            public static final PacketType CHAT_SESSION_UPDATE =          new PacketType(PROTOCOL, SENDER, 0x0A, "ChatSessionUpdate");
+            public static final PacketType CHUNK_BATCH_RECEIVED =         new PacketType(PROTOCOL, SENDER, 0x0B, "ChunkBatchReceived");
+            public static final PacketType CLIENT_COMMAND =               new PacketType(PROTOCOL, SENDER, 0x0C, "ClientCommand", "CPacketClientStatus");
+            public static final PacketType CLIENT_TICK_END =              new PacketType(PROTOCOL, SENDER, 0x0D, "ClientTickEnd");
+            public static final PacketType SETTINGS =                     new PacketType(PROTOCOL, SENDER, 0x0E, "ClientInformation", "Settings", "CPacketClientSettings");
+            public static final PacketType TAB_COMPLETE =                 new PacketType(PROTOCOL, SENDER, 0x0F, "CommandSuggestion", "TabComplete", "CPacketTabComplete");
+            public static final PacketType CONFIGURATION_ACK =            new PacketType(PROTOCOL, SENDER, 0x10, "ConfigurationAcknowledged");
+            public static final PacketType ENCHANT_ITEM =                 new PacketType(PROTOCOL, SENDER, 0x11, "ContainerButtonClick", "EnchantItem", "CPacketEnchantItem");
+            public static final PacketType WINDOW_CLICK =                 new PacketType(PROTOCOL, SENDER, 0x12, "ContainerClick", "WindowClick", "CPacketClickWindow");
+            public static final PacketType CLOSE_WINDOW =                 new PacketType(PROTOCOL, SENDER, 0x13, "ContainerClose", "CloseWindow", "CPacketCloseWindow");
+            public static final PacketType CONTAINER_SLOT_STATE_CHANGED = new PacketType(PROTOCOL, SENDER, 0x14, "ContainerSlotStateChanged", "ContainerSlotStateChangedPacket");
+            public static final PacketType COOKIE_RESPONSE =              new PacketType(PROTOCOL, SENDER, 0x15, "CookieResponse");
+            public static final PacketType CUSTOM_PAYLOAD =               new PacketType(PROTOCOL, SENDER, 0x16, "CustomPayload", "CPacketCustomPayload");
+            public static final PacketType DEBUG_SUBSCRIPTION_REQUEST =   new PacketType(PROTOCOL, SENDER, 0x17, "DebugSubscriptionRequest");
+            public static final PacketType B_EDIT =                       new PacketType(PROTOCOL, SENDER, 0x18, "EditBook", "BEdit");
+            public static final PacketType ENTITY_NBT_QUERY =             new PacketType(PROTOCOL, SENDER, 0x19, "EntityTagQuery", "EntityNBTQuery");
+            public static final PacketType USE_ENTITY =                   new PacketType(PROTOCOL, SENDER, 0x1A, "Interact", "UseEntity", "CPacketUseEntity");
+            public static final PacketType JIGSAW_GENERATE =              new PacketType(PROTOCOL, SENDER, 0x1B, "JigsawGenerate");
+            public static final PacketType KEEP_ALIVE =                   new PacketType(PROTOCOL, SENDER, 0x1C, "KeepAlive", "CPacketKeepAlive");
+            public static final PacketType DIFFICULTY_LOCK =              new PacketType(PROTOCOL, SENDER, 0x1D, "LockDifficulty", "DifficultyLock");
+            public static final PacketType POSITION =                     new PacketType(PROTOCOL, SENDER, 0x1E, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$Pos", "Flying$Position", "Flying$PacketPlayInPosition", "CPacketPlayer$Position");
+            public static final PacketType POSITION_LOOK =                new PacketType(PROTOCOL, SENDER, 0x1F, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$PosRot", "Flying$PositionLook", "Flying$PacketPlayInPositionLook", "CPacketPlayer$PositionRotation");
+            public static final PacketType LOOK =                         new PacketType(PROTOCOL, SENDER, 0x20, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$Rot", "Flying$Look", "Flying$PacketPlayInLook", "CPacketPlayer$Rotation");
+            public static final PacketType GROUND =                       new PacketType(PROTOCOL, SENDER, 0x21, "net.minecraft.network.protocol.game.ServerboundMovePlayerPacket$StatusOnly", "Flying$d");
+            public static final PacketType VEHICLE_MOVE =                 new PacketType(PROTOCOL, SENDER, 0x22, "MoveVehicle", "VehicleMove", "CPacketVehicleMove");
+            public static final PacketType BOAT_MOVE =                    new PacketType(PROTOCOL, SENDER, 0x23, "PaddleBoat", "BoatMove", "CPacketSteerBoat");
+            public static final PacketType PICK_ITEM_FROM_BLOCK =         new PacketType(PROTOCOL, SENDER, 0x24, "PickItemFromBlock");
+            public static final PacketType PICK_ITEM =                    new PacketType(PROTOCOL, SENDER, 0x25, "PickItemFromEntity", "PickItem");
+            public static final PacketType PING_REQUEST =                 new PacketType(PROTOCOL, SENDER, 0x26, "PingRequest");
+            public static final PacketType AUTO_RECIPE =                  new PacketType(PROTOCOL, SENDER, 0x27, "PlaceRecipe", "AutoRecipe", "CPacketPlaceRecipe");
+            public static final PacketType ABILITIES =                    new PacketType(PROTOCOL, SENDER, 0x28, "PlayerAbilities", "Abilities", "CPacketPlayerAbilities");
+            public static final PacketType BLOCK_DIG =                    new PacketType(PROTOCOL, SENDER, 0x29, "PlayerAction", "BlockDig", "CPacketPlayerDigging");
+            public static final PacketType ENTITY_ACTION =                new PacketType(PROTOCOL, SENDER, 0x2A, "PlayerCommand", "EntityAction", "CPacketEntityAction");
+            public static final PacketType STEER_VEHICLE =                new PacketType(PROTOCOL, SENDER, 0x2B, "PlayerInput", "SteerVehicle", "CPacketInput");
+            public static final PacketType PLAYER_LOADED =                new PacketType(PROTOCOL, SENDER, 0x2C, "PlayerLoaded");
+            public static final PacketType PONG =                         new PacketType(PROTOCOL, SENDER, 0x2D, "Pong");
+            public static final PacketType PUNCH =                        new PacketType(PROTOCOL, SENDER, 0x2E, MinecraftVersion.v26_3, "Punch");
+            public static final PacketType RECIPE_SETTINGS =              new PacketType(PROTOCOL, SENDER, 0x2F, MinecraftVersion.v26_3, "RecipeBookChangeSettings", "RecipeSettings");
+            public static final PacketType RECIPE_DISPLAYED =             new PacketType(PROTOCOL, SENDER, 0x30, MinecraftVersion.v26_3, "RecipeBookSeenRecipe", "RecipeDisplayed", "CPacketRecipeInfo");
+            public static final PacketType ITEM_NAME =                    new PacketType(PROTOCOL, SENDER, 0x31, MinecraftVersion.v26_3, "RenameItem", "ItemName");
+            public static final PacketType RESOURCE_PACK_STATUS =         new PacketType(PROTOCOL, SENDER, 0x32, MinecraftVersion.v26_3, "ResourcePack", "ResourcePackStatus", "CPacketResourcePackStatus");
+            public static final PacketType ADVANCEMENTS =                 new PacketType(PROTOCOL, SENDER, 0x33, MinecraftVersion.v26_3, "SeenAdvancements", "Advancements", "CPacketSeenAdvancements");
+            public static final PacketType TR_SEL =                       new PacketType(PROTOCOL, SENDER, 0x34, MinecraftVersion.v26_3, "SelectTrade", "TrSel");
+            public static final PacketType BEACON =                       new PacketType(PROTOCOL, SENDER, 0x35, MinecraftVersion.v26_3, "SetBeacon", "Beacon");
+            public static final PacketType HELD_ITEM_SLOT =               new PacketType(PROTOCOL, SENDER, 0x36, MinecraftVersion.v26_3, "SetCarriedItem", "HeldItemSlot", "CPacketHeldItemChange");
+            public static final PacketType SET_COMMAND_BLOCK =            new PacketType(PROTOCOL, SENDER, 0x37, MinecraftVersion.v26_3, "SetCommandBlock");
+            public static final PacketType SET_COMMAND_MINECART =         new PacketType(PROTOCOL, SENDER, 0x38, MinecraftVersion.v26_3, "SetCommandMinecart");
+            public static final PacketType SET_CREATIVE_SLOT =            new PacketType(PROTOCOL, SENDER, 0x39, MinecraftVersion.v26_3, "SetCreativeModeSlot", "SetCreativeSlot", "CPacketCreativeInventoryAction");
+            public static final PacketType SET_GAME_RULE =                new PacketType(PROTOCOL, SENDER, 0x3A, MinecraftVersion.v26_3, "SetGameRule");
+            public static final PacketType SET_JIGSAW =                   new PacketType(PROTOCOL, SENDER, 0x3B, MinecraftVersion.v26_3, "SetJigsawBlock", "SetJigsaw");
+            public static final PacketType STRUCT =                       new PacketType(PROTOCOL, SENDER, 0x3C, MinecraftVersion.v26_3, "SetStructureBlock", "Struct");
+            public static final PacketType SET_TEST_BLOCK =               new PacketType(PROTOCOL, SENDER, 0x3D, MinecraftVersion.v26_3, "SetTestBlock");
+            public static final PacketType UPDATE_SIGN =                  new PacketType(PROTOCOL, SENDER, 0x3E, MinecraftVersion.v26_3, "SignUpdate", "UpdateSign", "CPacketUpdateSign");
+            public static final PacketType SPECTATE_ENTITY =              new PacketType(PROTOCOL, SENDER, 0x3F, MinecraftVersion.v26_3, "SpectatorAction", "SpectateEntity");
+            public static final PacketType SPECTATE =                     new PacketType(PROTOCOL, SENDER, 0x40, "TeleportToEntity", "Spectate", "CPacketSpectate");
+            public static final PacketType TEST_INSTANCE_BLOCK_ACTION =   new PacketType(PROTOCOL, SENDER, 0x41, "TestInstanceBlockAction");
+            public static final PacketType USE_ITEM_ON =                  new PacketType(PROTOCOL, SENDER, 0x42, "UseItemOn", "BlockPlace", "CPacketPlayerTryUseItemOnBlock");
+            public static final PacketType USE_ITEM =                     new PacketType(PROTOCOL, SENDER, 0x43, "UseItem", "CPacketPlayerTryUseItem");
+            public static final PacketType CUSTOM_CLICK_ACTION =          new PacketType(PROTOCOL, SENDER, 0x44, "CustomClickAction");
 
             /**
              * @deprecated Removed in 1.17
@@ -500,6 +535,18 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             @Deprecated
             public static final PacketType CHAT_PREVIEW =                 new PacketType(PROTOCOL, SENDER, 253, "ChatPreview");
 
+            /**
+             * deprecated Removed in 1.21.9
+             */
+            @Deprecated
+            public static final PacketType DEBUG_SAMPLE_SUBSCRIPTION =    new PacketType(PROTOCOL, SENDER, 0x16, "DebugSampleSubscription");
+
+            /**
+             * @deprecated Removed in 26.3
+             */
+            @Deprecated
+            public static final PacketType ARM_ANIMATION =                new PacketType(PROTOCOL, SENDER, 252, "Swing", "ArmAnimation", "CPacketAnimation");
+
             /**
              * @deprecated Renamed to USE_ITEM_ON
              */
@@ -609,7 +656,7 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             @ForceAsync
             public static final PacketType DISCONNECT =                   new PacketType(PROTOCOL, SENDER, 0x00, "LoginDisconnect", "Disconnect", "SPacketDisconnect");
             public static final PacketType ENCRYPTION_BEGIN =             new PacketType(PROTOCOL, SENDER, 0x01, "Hello", "EncryptionBegin", "SPacketEncryptionRequest");
-            public static final PacketType SUCCESS =                      new PacketType(PROTOCOL, SENDER, 0x02, "GameProfile", "Success", "SPacketLoginSuccess");
+            public static final PacketType SUCCESS =                      new PacketType(PROTOCOL, SENDER, 0x02, "LoginFinished", "GameProfile", "Success", "SPacketLoginSuccess");
             public static final PacketType SET_COMPRESSION =              new PacketType(PROTOCOL, SENDER, 0x03, "LoginCompression", "SetCompression", "SPacketEnableCompression");
             public static final PacketType CUSTOM_PAYLOAD =               new PacketType(PROTOCOL, SENDER, 0x04, "CustomQuery", "CustomPayload", "SPacketCustomPayload");
             public static final PacketType COOKIE_REQUEST =               new PacketType(PROTOCOL, SENDER, 0x05, "CookieRequest");
@@ -681,13 +728,17 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             public static final PacketType REGISTRY_DATA =                new PacketType(PROTOCOL, SENDER, 0x07, "RegistryData");
             public static final PacketType REMOVE_RESOURCE_PACK =         new PacketType(PROTOCOL, SENDER, 0x08, "ResourcePackPop");
             public static final PacketType ADD_RESOURCE_PACK =            new PacketType(PROTOCOL, SENDER, 0x09, "ResourcePackPush");
-            public static final PacketType STORE_COOKIE =                 new PacketType(PROTOCOL, SENDER, 0x0A, "StoreCookie");
-            public static final PacketType TRANSFER =                     new PacketType(PROTOCOL, SENDER, 0x0B, "Transfer");
-            public static final PacketType UPDATE_ENABLED_FEATURES =      new PacketType(PROTOCOL, SENDER, 0x0C, "UpdateEnabledFeatures");
-            public static final PacketType UPDATE_TAGS =                  new PacketType(PROTOCOL, SENDER, 0x0D, "UpdateTags");
-            public static final PacketType SELECT_KNOWN_PACKS =           new PacketType(PROTOCOL, SENDER, 0x0E, "ClientboundSelectKnownPacks");
-            public static final PacketType REPORT_DETAILS =               new PacketType(PROTOCOL, SENDER, 0x0F, "CustomReportDetails");
-            public static final PacketType SERVER_LINKS =                 new PacketType(PROTOCOL, SENDER, 0x10, "ServerLinks");
+            public static final PacketType POST_EFFECTS =                 new PacketType(PROTOCOL, SENDER, 0x0A, "PostEffects");
+            public static final PacketType STORE_COOKIE =                 new PacketType(PROTOCOL, SENDER, 0x0B, "StoreCookie");
+            public static final PacketType TRANSFER =                     new PacketType(PROTOCOL, SENDER, 0x0C, "Transfer");
+            public static final PacketType UPDATE_ENABLED_FEATURES =      new PacketType(PROTOCOL, SENDER, 0x0D, "UpdateEnabledFeatures");
+            public static final PacketType UPDATE_TAGS =                  new PacketType(PROTOCOL, SENDER, 0x0E, "UpdateTags");
+            public static final PacketType SELECT_KNOWN_PACKS =           new PacketType(PROTOCOL, SENDER, 0x0F, "ClientboundSelectKnownPacks");
+            public static final PacketType REPORT_DETAILS =               new PacketType(PROTOCOL, SENDER, 0x10, "CustomReportDetails");
+            public static final PacketType SERVER_LINKS =                 new PacketType(PROTOCOL, SENDER, 0x11, "ServerLinks");
+            public static final PacketType CLEAR_DIALOG =                 new PacketType(PROTOCOL, SENDER, 0x12, "ClearDialog");
+            public static final PacketType SHOW_DIALOG =                  new PacketType(PROTOCOL, SENDER, 0x13, "ShowDialog");
+            public static final PacketType CODE_OF_CONDUCT =              new PacketType(PROTOCOL, SENDER, 0x14, "CodeOfConduct");
 
             /**
              * @deprecated Removed in 1.20.4: replaced with new packets for removing and sending resource packs
@@ -719,6 +770,8 @@ public class PacketType implements Serializable, Cloneable, Comparable<PacketTyp
             public static final PacketType PONG =                         new PacketType(PROTOCOL, SENDER, 0x05, "Pong");
             public static final PacketType RESOURCE_PACK_ACK =            new PacketType(PROTOCOL, SENDER, 0x06, "ResourcePack");
             public static final PacketType SELECT_KNOWN_PACKS =           new PacketType(PROTOCOL, SENDER, 0x07, "ServerboundSelectKnownPacks");
+            public static final PacketType CUSTOM_CLICK_ACTION =          new PacketType(PROTOCOL, SENDER, 0x08, "CustomClickAction");
+            public static final PacketType ACCEPT_CODE_OF_CONDUCT =       new PacketType(PROTOCOL, SENDER, 0x09, "AcceptCodeOfConduct");
 
             private static final Client INSTANCE = new Client();
 

src/main/java/com/comphenix/protocol/ProtocolLib.java

@@ -49,10 +49,11 @@ import java.util.logging.Logger;
 
 import org.bukkit.Server;
 import org.bukkit.command.CommandExecutor;
-import org.bukkit.command.PluginCommand;
 import org.bukkit.plugin.PluginManager;
 import org.bukkit.plugin.java.JavaPlugin;
 
+import com.comphenix.protocol.internal.PlatformProvider;
+
 /**
  * The main entry point for ProtocolLib.
  *
@@ -444,14 +445,7 @@ public class ProtocolLib extends JavaPlugin {
                 return;
             }
 
-            PluginCommand command = this.getCommand(name);
-
-            // Try to load the command
-            if (command != null) {
-                command.setExecutor(executor);
-            } else {
-                throw new RuntimeException("plugin.yml might be corrupt.");
-            }
+            PlatformProvider.get().registerCommand(this, name, executor);
         } catch (RuntimeException e) {
             reporter.reportWarning(this,
                     Report.newBuilder(REPORT_CANNOT_REGISTER_COMMAND).messageParam(name, e.getMessage()).error(e));
@@ -504,6 +498,17 @@ public class ProtocolLib extends JavaPlugin {
     }
 
     private void checkUpdates() {
+        // Do not run updater if no supported updater is loaded
+        if (this.updater == null) {
+            highlyVisibleError(
+                    " WARNING ",
+                    " ProtocolLib is unable to check for updates. ",
+                    " You are likely not using a supported version (Such as CraftBukkit). "
+            );
+            ProtocolLibrary.disableUpdates();
+            return;
+        }
+
         // Ignore milliseconds - it's pointless
         long currentTime = System.currentTimeMillis() / MILLI_PER_SECOND;
 

src/main/java/com/comphenix/protocol/ProtocolLibrary.java

@@ -35,12 +35,12 @@ public class ProtocolLibrary {
     /**
      * The maximum version ProtocolLib has been tested with.
      */
-    public static final String MAXIMUM_MINECRAFT_VERSION = "1.21.1";
+    public static final String MAXIMUM_MINECRAFT_VERSION = "26.3";
 
     /**
-     * The date (with ISO 8601 or YYYY-MM-DD) when the most recent version (1.20.4) was released.
+     * The date (with ISO 8601 or YYYY-MM-DD) when the most recent version (26.3) was released.
      */
-    public static final String MINECRAFT_LAST_RELEASE_DATE = "2024-08-08";
+    public static final String MINECRAFT_LAST_RELEASE_DATE = "2026-09-15";
 
     private static Plugin plugin;
     private static ProtocolConfig config;

src/main/java/com/comphenix/protocol/UpdateNotifyRunnable.java

@@ -0,0 +1,69 @@
+/**
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program;
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307 USA
+ */
+package com.comphenix.protocol;
+
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.updater.Updater;
+
+/**
+ * Callback invoked on the main thread after an asynchronous update check completes.
+ * <p>
+ * Extracted as a top-level class (instead of an anonymous inner class) so that
+ * {@code PaperPluginClassLoader} can always resolve its {@code .class} entry when
+ * {@link org.bukkit.scheduler.BukkitScheduler#runTask} dispatches it back onto the
+ * main server thread — the same pattern used by {@code SpigotUpdateRunnable}.
+ */
+final class UpdateNotifyRunnable implements Runnable {
+
+    private final CommandSender sender;
+    private final boolean command;
+    private final Updater updater;
+    private final ProtocolConfig config;
+    private final Plugin plugin;
+    private final CommandProtocol owner;
+
+    UpdateNotifyRunnable(CommandSender sender, boolean command,
+                         Updater updater, ProtocolConfig config,
+                         Plugin plugin, CommandProtocol owner) {
+        this.sender = sender;
+        this.command = command;
+        this.updater = updater;
+        this.config = config;
+        this.plugin = plugin;
+        this.owner = owner;
+    }
+
+    @Override
+    public void run() {
+        if (command) {
+            sender.sendMessage(ChatColor.YELLOW + "[ProtocolLib] " + updater.getResult());
+            String remoteVersion = updater.getRemoteVersion();
+            if (remoteVersion != null) {
+                sender.sendMessage(ChatColor.YELLOW + "Remote version: " + remoteVersion);
+                sender.sendMessage(ChatColor.YELLOW + "Current version: " + plugin.getDescription().getVersion());
+            }
+        } else if (updater.shouldNotify() || config.isDebug()) {
+            sender.sendMessage(ChatColor.YELLOW + "[ProtocolLib] " + updater.getResult());
+        }
+
+        updater.removeListener(this);
+        owner.updateFinished();
+    }
+}

src/main/java/com/comphenix/protocol/async/AsyncFilterManager.java

@@ -27,6 +27,7 @@ import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.events.PacketListener;
 import com.comphenix.protocol.injector.collection.InboundPacketListenerSet;
 import com.comphenix.protocol.injector.collection.OutboundPacketListenerSet;
+import com.comphenix.protocol.injector.netty.Injector;
 import com.comphenix.protocol.scheduler.ProtocolScheduler;
 import com.google.common.base.Objects;
 import com.google.common.collect.ImmutableList;
@@ -274,7 +275,7 @@ public class AsyncFilterManager implements AsynchronousManager {
      * @return TRUE if we are, FALSE otherwise.
      */
     private boolean onMainThread() {
-        return Thread.currentThread().getId() == mainThread.getId();
+        return Thread.currentThread() == mainThread;
     }
     
     @Override
@@ -308,12 +309,10 @@ public class AsyncFilterManager implements AsynchronousManager {
 
         asyncMarker.setQueuedSendingIndex(asyncMarker.getNewSendingIndex());
 
-        // The player is only be null when they're logged out,
-        // so this should be a pretty safe check
-        Player player = syncPacket.getPlayer();
-        if (player != null) {
+        PacketSendingQueue sendingQueue = getSendingQueue(syncPacket);
+        if (sendingQueue != null) {
             // Start the process
-            getSendingQueue(syncPacket).enqueue(newEvent);
+            sendingQueue.enqueue(newEvent);
 
             // We know this is occurring on the main thread, so pass TRUE
             getProcessingQueue(syncPacket).enqueue(newEvent, true);
@@ -322,12 +321,12 @@ public class AsyncFilterManager implements AsynchronousManager {
 
     @Override
     public Set<PacketType> getReceivingTypes() {
-        return serverProcessingQueue.keySet();
+        return clientProcessingQueue.keySet();
     }
 
     @Override
     public Set<PacketType> getSendingTypes() {
-        return clientProcessingQueue.keySet();
+        return serverProcessingQueue.keySet();
     }
     
     /**
@@ -347,8 +346,8 @@ public class AsyncFilterManager implements AsynchronousManager {
      * Construct a asynchronous marker with all the default values.
      * @return Asynchronous marker.
      */
-    public AsyncMarker createAsyncMarker() {
-        return createAsyncMarker(AsyncMarker.DEFAULT_TIMEOUT_DELTA);
+    public AsyncMarker createAsyncMarker(Injector injector) {
+        return createAsyncMarker(injector, AsyncMarker.DEFAULT_TIMEOUT_DELTA);
     }
     
     /**
@@ -356,13 +355,13 @@ public class AsyncFilterManager implements AsynchronousManager {
      * @param timeoutDelta - how long (in ms) until the packet expire.
      * @return An async marker.
      */
-    public AsyncMarker createAsyncMarker(long timeoutDelta) {
-        return createAsyncMarker(timeoutDelta, currentSendingIndex.incrementAndGet());
+    public AsyncMarker createAsyncMarker(Injector injector, long timeoutDelta) {
+        return createAsyncMarker(injector, timeoutDelta, currentSendingIndex.incrementAndGet());
     }
     
     // Helper method
-    private AsyncMarker createAsyncMarker(long timeoutDelta, long sendingIndex) {
-        return new AsyncMarker(manager, sendingIndex, System.currentTimeMillis(), timeoutDelta);
+    private AsyncMarker createAsyncMarker(Injector injector, long timeoutDelta, long sendingIndex) {
+        return new AsyncMarker(injector, sendingIndex, System.currentTimeMillis(), timeoutDelta);
     }
     
     @Override

src/main/java/com/comphenix/protocol/async/AsyncListenerHandler.java

@@ -538,7 +538,7 @@ public class AsyncListenerHandler {
      */
     private void listenerLoop(int workerID) {
         // Danger, danger!
-        if (Thread.currentThread().getId() == mainThread.getId())
+        if (Thread.currentThread() == mainThread)
             throw new IllegalStateException("Do not call this method from the main thread.");
         if (cancelled)
             throw new IllegalStateException("Listener has been cancelled. Create a new listener instead.");

src/main/java/com/comphenix/protocol/async/AsyncMarker.java

@@ -23,14 +23,18 @@ import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Level;
 
 import com.comphenix.protocol.PacketStream;
 import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
 import com.comphenix.protocol.ProtocolLogger;
 import com.comphenix.protocol.events.NetworkMarker;
 import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.netty.Injector;
 import com.comphenix.protocol.reflect.FieldAccessException;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.utility.MinecraftReflection;
@@ -64,7 +68,7 @@ public class AsyncMarker implements Serializable, Comparable<AsyncMarker> {
     /**
      * The packet stream responsible for transmitting the packet when it's done processing.
      */
-    private transient PacketStream packetStream;
+    private final Injector injector;
 
     /**
      * Current list of async packet listeners.
@@ -86,7 +90,7 @@ public class AsyncMarker implements Serializable, Comparable<AsyncMarker> {
     private volatile boolean processed;
 
     // Whether or not the packet has been sent
-    private volatile boolean transmitted;
+    private final AtomicBoolean transmitted = new AtomicBoolean(false);
 
     // Whether or not the asynchronous processing itself should be cancelled
     private volatile boolean asyncCancelled;
@@ -109,11 +113,8 @@ public class AsyncMarker implements Serializable, Comparable<AsyncMarker> {
      * Create a container for asyncronous packets.
      * @param initialTime - the current time in milliseconds since 01.01.1970 00:00.
      */
-    AsyncMarker(PacketStream packetStream, long sendingIndex, long initialTime, long timeoutDelta) {
-        if (packetStream == null)
-            throw new IllegalArgumentException("packetStream cannot be NULL");
-
-        this.packetStream = packetStream;
+    AsyncMarker(Injector injector, long sendingIndex, long initialTime, long timeoutDelta) {
+        this.injector = Objects.requireNonNull(injector, "injector is nul");
 
         // Timeout
         this.initialTime = initialTime;
@@ -180,16 +181,18 @@ public class AsyncMarker implements Serializable, Comparable<AsyncMarker> {
      * Retrieve the packet stream responsible for transmitting this packet.
      * @return The packet stream.
      */
+    @Deprecated
     public PacketStream getPacketStream() {
-        return packetStream;
+        return ProtocolLibrary.getProtocolManager();
     }
 
     /**
      * Sets the output packet stream responsible for transmitting this packet.
      * @param packetStream - new output packet stream.
      */
+    @Deprecated
     public void setPacketStream(PacketStream packetStream) {
-        this.packetStream = packetStream;
+        // NOOP
     }
 
     /**
@@ -285,7 +288,7 @@ public class AsyncMarker implements Serializable, Comparable<AsyncMarker> {
      * @return TRUE if it has been sent before, FALSE otherwise.
      */
     public boolean isTransmitted() {
-        return transmitted;
+        return transmitted.get();
     }
 
     /**
@@ -383,13 +386,18 @@ public class AsyncMarker implements Serializable, Comparable<AsyncMarker> {
      * @throws IOException If the packet couldn't be sent.
      */
     void sendPacket(PacketEvent event) throws IOException {
-        if (event.isServerPacket()) {
-            packetStream.sendServerPacket(event.getPlayer(), event.getPacket(), NetworkMarker.getNetworkMarker(event), false);
-        } else {
-            packetStream.receiveClientPacket(event.getPlayer(), event.getPacket(), NetworkMarker.getNetworkMarker(event),
-                    false);
+        if (!this.transmitted.compareAndSet(false, true)) {
+            return;
+        }
+
+        Object handle = event.getPacket().getHandle();
+
+        if (event.isServerPacket()) {
+            NetworkMarker marker = NetworkMarker.getNetworkMarker(event);
+            this.injector.sendClientboundPacket(handle, marker, false);
+        } else {
+            this.injector.readServerboundPacket(handle);
         }
-        transmitted = true;
     }
 
     /**

src/main/java/com/comphenix/protocol/async/PacketProcessingQueue.java

@@ -30,6 +30,8 @@ import com.comphenix.protocol.error.Report;
 import com.comphenix.protocol.error.ReportType;
 import com.comphenix.protocol.events.ListeningWhitelist;
 import com.comphenix.protocol.events.PacketEvent;
+
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.MinMaxPriorityQueue;
 
@@ -209,7 +211,7 @@ class PacketProcessingQueue {
     
     public void cleanupAll() {
         // Cancel all the threads and every listener
-        for (AsyncListenerHandler handler : map.values()) {
+        for (AsyncListenerHandler handler : ImmutableList.copyOf(map.values())) {
             handler.cancel();
         }
         

src/main/java/com/comphenix/protocol/async/PlayerSendingHandler.java

@@ -134,14 +134,18 @@ class PlayerSendingHandler {
      * @return The server or client sending queue the packet belongs to.
      */
     public PacketSendingQueue getSendingQueue(PacketEvent packet, boolean createNew) {
-        QueueContainer queues = playerSendingQueues.get(packet.getPlayer());
+        Player player = packet.getPlayer();
+        if (player == null)
+            return null;
+
+        QueueContainer queues = playerSendingQueues.get(player);
         
         // Safe concurrent initialization
         if (queues == null && createNew) {
             final QueueContainer newContainer = new QueueContainer();
 
             // Attempt to map the queue
-            queues = playerSendingQueues.putIfAbsent(packet.getPlayer(), newContainer);
+            queues = playerSendingQueues.putIfAbsent(player, newContainer);
             
             if (queues == null) {
                 queues = newContainer;

src/main/java/com/comphenix/protocol/collections/IntegerMap.java

@@ -58,6 +58,8 @@ public class IntegerMap<T> {
      * @return The old associated value, or NULL.
      */
     public T remove(int key) {
+        if (key < 0 || key >= array.length) return null;
+
         T old = array[key];
         array[key] = null;
 

src/main/java/com/comphenix/protocol/concurrency/ConcurrentPlayerMap.java

@@ -190,7 +190,8 @@ public class ConcurrentPlayerMap<TValue> extends AbstractMap<Player, TValue> imp
         Preconditions.checkNotNull(player, "player cannot be null");
 
         Object key = keyMethod.apply(player);
-        
+        Preconditions.checkState(key != null, "Unable to derive a key for the player.");
+
         keyLookup.put(key, player);
         return key;
     }

src/main/java/com/comphenix/protocol/events/AbstractStructure.java

@@ -55,6 +55,8 @@ import com.comphenix.protocol.wrappers.WrappedLevelChunkData;
 import com.comphenix.protocol.wrappers.WrappedMessageSignature;
 import com.comphenix.protocol.wrappers.WrappedNumberFormat;
 import com.comphenix.protocol.wrappers.WrappedParticle;
+import com.comphenix.protocol.wrappers.WrappedPositionMoveRotation;
+import com.comphenix.protocol.wrappers.WrappedPositionPath;
 import com.comphenix.protocol.wrappers.WrappedProfilePublicKey;
 import com.comphenix.protocol.wrappers.WrappedProfilePublicKey.WrappedProfileKeyData;
 import com.comphenix.protocol.wrappers.WrappedRegistrable;
@@ -64,6 +66,7 @@ import com.comphenix.protocol.wrappers.WrappedSaltedSignature;
 import com.comphenix.protocol.wrappers.WrappedServerPing;
 import com.comphenix.protocol.wrappers.WrappedStatistic;
 import com.comphenix.protocol.wrappers.WrappedTeamParameters;
+import com.comphenix.protocol.wrappers.WrappedVecDelta;
 import com.comphenix.protocol.wrappers.WrappedWatchableObject;
 import com.comphenix.protocol.wrappers.nbt.NbtBase;
 import com.comphenix.protocol.wrappers.nbt.NbtCompound;
@@ -597,9 +600,7 @@ public abstract class AbstractStructure {
      */
     public StructureModifier<List<PlayerInfoData>> getPlayerInfoDataLists() {
         // Convert to and from the ProtocolLib wrapper
-        return structureModifier.withType(
-                Collection.class,
-                BukkitConverters.getListConverter(PlayerInfoData.getConverter()));
+        return getLists(PlayerInfoData.getConverter());
     }
 
     /**
@@ -1165,9 +1166,35 @@ public abstract class AbstractStructure {
     }
 
     /**
+     * Since 26.3 the signature fields are optional, an absent signature is read and written as {@code null}.
+     *
      * @return read/writer structure direct access to unsalted signature data for example in chat message (since 1.19.3)
      */
     public StructureModifier<WrappedMessageSignature> getMessageSignatures() {
+        if (MinecraftVersion.v26_3.atOrAbove()) {
+            EquivalentConverter<WrappedMessageSignature> converter = BukkitConverters.getWrappedMessageSignatureConverter();
+            return structureModifier.withParamType(
+                    Optional.class,
+                    new EquivalentConverter<WrappedMessageSignature>() {
+                        @Override
+                        public Object getGeneric(WrappedMessageSignature specific) {
+                            return Optional.ofNullable(converter.getGeneric(specific));
+                        }
+
+                        @Override
+                        public WrappedMessageSignature getSpecific(Object generic) {
+                            return generic == null ? null : ((Optional<?>) generic).map(converter::getSpecific).orElse(null);
+                        }
+
+                        @Override
+                        public Class<WrappedMessageSignature> getSpecificType() {
+                            return WrappedMessageSignature.class;
+                        }
+                    },
+                    MinecraftReflection.getMessageSignatureClass()
+            );
+        }
+
         return structureModifier.withType(
                 MinecraftReflection.getMessageSignatureClass(),
                 BukkitConverters.getWrappedMessageSignatureConverter()
@@ -1297,6 +1324,48 @@ public abstract class AbstractStructure {
         ));
     }
 
+    /**
+     * Retrieve a read/write structure for {@link WrappedPositionMoveRotation} (available since Minecraft 1.21.2).
+     * <p>
+     * This is used in packets such as {@code ENTITY_TELEPORT} and {@code ENTITY_POSITION_SYNC} (before 26.3).
+     *
+     * @return A modifier for PositionMoveRotation fields.
+     */
+    public StructureModifier<WrappedPositionMoveRotation> getPositionMoveRotation() {
+        return structureModifier.withType(
+                MinecraftReflection.getPositionMoveRotationClass(),
+                WrappedPositionMoveRotation.getConverter()
+        );
+    }
+
+    /**
+     * Retrieve a read/write structure for {@link WrappedVecDelta} (available since Minecraft 26.3).
+     * <p>
+     * This is used in {@code REL_ENTITY_MOVE} and {@code REL_ENTITY_MOVE_LOOK}.
+     *
+     * @return A modifier for VecDelta fields.
+     */
+    public StructureModifier<WrappedVecDelta> getVecDeltas() {
+        return structureModifier.withType(
+                MinecraftReflection.getVecDeltaClass().orElse(void.class),
+                WrappedVecDelta.getConverter()
+        );
+    }
+
+    /**
+     * Retrieve a read/write structure for {@link WrappedPositionPath} (available since Minecraft 26.3).
+     * <p>
+     * This is used in {@code ENTITY_POSITION_SYNC}.
+     *
+     * @return A modifier for PositionPath fields.
+     */
+    public StructureModifier<WrappedPositionPath> getPositionPaths() {
+        return structureModifier.withType(
+                MinecraftReflection.getPositionPathClass().orElse(void.class),
+                WrappedPositionPath.getConverter()
+        );
+    }
+
     /**
      * Represents an equivalent converter for ItemStack arrays.
      * @author Kristian

src/main/java/com/comphenix/protocol/events/PacketAdapter.java

@@ -232,13 +232,13 @@ public abstract class PacketAdapter implements PacketListener {
     @Override
     public void onPacketReceiving(PacketEvent event) {
         // Lets prevent some bugs
-        throw new IllegalStateException("Override onPacketReceiving to get notifcations of received packets!");
+        throw new IllegalStateException("Override onPacketReceiving to get notifications of received packets!");
     }
 
     @Override
     public void onPacketSending(PacketEvent event) {
         // Lets prevent some bugs
-        throw new IllegalStateException("Override onPacketSending to get notifcations of sent packets!");
+        throw new IllegalStateException("Override onPacketSending to get notifications of sent packets!");
     }
 
     @Override

src/main/java/com/comphenix/protocol/events/PacketEvent.java

@@ -391,6 +391,8 @@ public class PacketEvent extends EventObject implements Cancellable {
      *     <li>getPlayer</li>
      *     <li>getAddress</li>
      *     <li>getServer</li>
+     *     <li>getName, after the login start packet</li>
+     *     <li>getUniqueId, when supplied by the login protocol</li>
      *     <li>chat</li>
      *     <li>sendMessage</li>
      *     <li>kickPlayer</li>

src/main/java/com/comphenix/protocol/events/SerializedOfflinePlayer.java

@@ -22,8 +22,10 @@ import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.io.Serializable;
 import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
 import java.time.Duration;
 import java.time.Instant;
 import java.util.Date;
@@ -68,7 +70,7 @@ import org.jetbrains.annotations.Nullable;
  *
  * @author Kristian
  */
-class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
+class SerializedOfflinePlayer implements Serializable {
 
     /**
      * Generated by Eclipse.
@@ -122,22 +124,18 @@ class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
         }
     }
 
-    @Override
     public boolean isOp() {
         return operator;
     }
 
-    @Override
     public void setOp(boolean operator) {
         this.operator = operator;
     }
 
-    @Override
     public Map<String, Object> serialize() {
         throw new UnsupportedOperationException();
     }
 
-    @Override
     public Location getBedSpawnLocation() {
         return bedSpawnLocation;
     }
@@ -152,12 +150,10 @@ class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
         return lastSeen;
     }
 
-    @Override
     public Location getRespawnLocation() {
         return null;
     }
 
-    @Override
     public Location getLocation() {
         return null;
     }
@@ -221,42 +217,34 @@ class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
     public void setStatistic(Statistic statistic, EntityType entityType, int i) {
     }
 
-    @Override
     public Location getLastDeathLocation() {
         return null;
     }
 
-    @Override
     public long getFirstPlayed() {
         return firstPlayed;
     }
 
-    @Override
     public long getLastPlayed() {
         return lastPlayed;
     }
 
-    @Override
     public UUID getUniqueId() {
         return uuid;
     }
 
-    @Override
     public @NotNull PlayerProfile getPlayerProfile() {
         return null;
     }
 
-    @Override
     public String getName() {
         return name;
     }
 
-    @Override
     public boolean hasPlayedBefore() {
         return playedBefore;
     }
 
-    @Override
     public boolean isBanned() {
         return banned;
     }
@@ -283,17 +271,14 @@ class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
         this.banned = banned;
     }
 
-    @Override
     public boolean isOnline() {
         return online;
     }
 
-    @Override
     public boolean isWhitelisted() {
         return whitelisted;
     }
 
-    @Override
     public void setWhitelisted(boolean whitelisted) {
         this.whitelisted = whitelisted;
     }
@@ -330,7 +315,6 @@ class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
         }
     }
 
-    @Override
     public Player getPlayer() {
         try {
             // Try to get the real player underneath
@@ -349,7 +333,7 @@ class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
      */
     public Player getProxyPlayer() {
         try {
-            return (Player) proxyPlayerConstructor.newInstance(this);
+            return (Player) proxyPlayerConstructor.newInstance(this.createOfflinePlayerProxy());
         } catch (IllegalAccessException e) {
             throw new RuntimeException("Cannot access reflection.", e);
         } catch (InstantiationException e) {
@@ -359,6 +343,38 @@ class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
         }
     }
 
+    private OfflinePlayer createOfflinePlayerProxy() {
+        return (OfflinePlayer) Proxy.newProxyInstance(
+                OfflinePlayer.class.getClassLoader(),
+                new Class<?>[]{OfflinePlayer.class},
+                (proxy, method, arguments) -> {
+                    if (method.getDeclaringClass() == Object.class) {
+                        return switch (method.getName()) {
+                            case "equals" -> proxy == arguments[0];
+                            case "hashCode" -> System.identityHashCode(proxy);
+                            case "toString" -> "SerializedOfflinePlayer[" + this.name + "]";
+                            default -> throw new UnsupportedOperationException("Unsupported Object method " + method);
+                        };
+                    }
+
+                    try {
+                        Method target = SerializedOfflinePlayer.class.getMethod(
+                                method.getName(),
+                                method.getParameterTypes());
+                        return target.invoke(this, arguments);
+                    } catch (NoSuchMethodException exception) {
+                        if (method.isDefault()) {
+                            return InvocationHandler.invokeDefault(proxy, method, arguments);
+                        }
+                        throw new UnsupportedOperationException(
+                                "The method " + method.getName() + " is not supported for offline players.",
+                                exception);
+                    } catch (InvocationTargetException exception) {
+                        throw exception.getCause();
+                    }
+                });
+    }
+
     private static Constructor<? extends Player> setupProxyPlayerConstructor() {
         final Method[] offlinePlayerMethods = OfflinePlayer.class.getMethods();
         final String[] methodNames = new String[offlinePlayerMethods.length];

src/main/java/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -43,6 +43,7 @@ import com.comphenix.protocol.injector.PluginVerifier.VerificationResult;
 import com.comphenix.protocol.injector.collection.InboundPacketListenerSet;
 import com.comphenix.protocol.injector.collection.OutboundPacketListenerSet;
 import com.comphenix.protocol.injector.collection.PacketListenerSet;
+import com.comphenix.protocol.injector.netty.Injector;
 import com.comphenix.protocol.injector.netty.WirePacket;
 import com.comphenix.protocol.injector.netty.manager.NetworkManagerInjector;
 import com.comphenix.protocol.injector.packet.PacketRegistry;
@@ -151,29 +152,20 @@ public class PacketFilterManager implements ListenerManager, InternalManager {
 
     @Override
     public void sendServerPacket(Player receiver, PacketContainer packet, NetworkMarker marker, boolean filters) {
-        if (!this.closed) {
-            // if we skip the packet events later when actually writing into the pipeline we at least notify all
-            // monitor listeners before doing so - they will not be able to change the event tho
-            if (!filters) {
-                // ensure we are on the main thread if any listener requires that
-                if (this.hasMainThreadListener(packet.getType()) && !this.server.isPrimaryThread()) {
-                    NetworkMarker copy = marker; // okay fine
-                    ProtocolLibrary.getScheduler().scheduleSyncDelayedTask(
-                            () -> this.sendServerPacket(receiver, packet, copy, false), 1L);
-                    return;
-                }
-
-                // construct the event and post to all monitor listeners
+        if (this.closed) {
+            return;
+        }
+        
+        // A monitor listener should never modify a packet/event so we can simply invoke monitor listeners
+        // independently of our injector pipeline 
+        if (!filters) {
+            this.runMonitorListeners(packet, () -> {
                 PacketEvent event = PacketEvent.fromServer(this, packet, marker, receiver, false);
                 this.outboundListeners.invoke(event, ListenerPriority.MONITOR);
-
-                // update the marker of the event without accidentally constructing it
-                marker = NetworkMarker.getNetworkMarker(event);
-            }
-
-            // process outbound
-            this.networkManagerInjector.getInjector(receiver).sendClientboundPacket(packet.getHandle(), marker, filters);
+            });
         }
+
+        this.networkManagerInjector.getInjector(receiver).sendClientboundPacket(packet.getHandle(), marker, filters);
     }
 
     @Override
@@ -200,34 +192,40 @@ public class PacketFilterManager implements ListenerManager, InternalManager {
 
     @Override
     public void receiveClientPacket(Player sender, PacketContainer packet, NetworkMarker marker, boolean filters) {
-        if (!this.closed) {
-            // make sure we are on the main thread if any listener of the packet needs it
-            if (this.hasMainThreadListener(packet.getType()) && !this.server.isPrimaryThread()) {
-                ProtocolLibrary.getScheduler().runTask(
-                        () -> this.receiveClientPacket(sender, packet, marker, filters));
+        if (this.closed) {
+            return;
+        }
+
+        // make sure we are on the main thread if any listener of the packet needs it
+        if (filters && this.requiresMainThread(packet)) {
+            ProtocolLibrary.getScheduler().runTask(
+                    () -> this.receiveClientPacket(sender, packet, marker, filters));
+            return;
+        }
+
+        Object nmsPacket = packet.getHandle();
+
+        if (filters) {
+            PacketEvent event = PacketEvent.fromClient(this, packet, marker, sender, false);
+            this.invokeInboundPacketListeners(event);
+
+            if (event.isCancelled()) {
                 return;
             }
 
-            Object nmsPacket = packet.getHandle();
-            // check to which listeners we need to post the packet
-            if (filters) {
-                // post to all listeners
-            	PacketEvent event = PacketEvent.fromClient(this.networkManagerInjector, packet, null, sender);
-                this.invokeInboundPacketListeners(event);
-                if (event.isCancelled()) {
-                    return;
-                }
-
-                // prevent possible de-sync
-                nmsPacket = event.getPacket().getHandle();
-            } else {
+            // Prevent possible de-sync if the packet was replaced by a listener.
+            nmsPacket = event.getPacket().getHandle();
+        } else {
+            // A monitor listener should never modify a packet/event so we can simply invoke monitor listeners
+            // independently of our injector pipeline 
+            this.runMonitorListeners(packet, () -> {
                 PacketEvent event = PacketEvent.fromClient(this, packet, marker, sender, false);
                 this.inboundListeners.invoke(event, ListenerPriority.MONITOR);
-            }
-
-            // post to the player inject, reset our cancel state change
-            this.networkManagerInjector.getInjector(sender).readServerboundPacket(nmsPacket);
+            });
         }
+
+        // post to the player inject, reset our cancel state change
+        this.networkManagerInjector.getInjector(sender).readServerboundPacket(nmsPacket);
     }
 
     @Override
@@ -428,14 +426,20 @@ public class PacketFilterManager implements ListenerManager, InternalManager {
             this.injected = true;
             this.networkManagerInjector.inject();
 
+            // Paper disables reconfiguration when any PlayerLoginEvent listener is registered.
+            if (!this.networkManagerInjector.isUsingPaperChannelInitializer()) {
+                manager.registerEvents(new Listener() {
+
+                    @EventHandler(priority = EventPriority.LOWEST)
+                    public void handleLogin(PlayerLoginEvent event) {
+                        networkManagerInjector.getInjector(event.getPlayer()).inject();
+                    }
+                }, plugin);
+            }
+
             // all listeners we need, this is a bit messy, but it makes the job correctly
             manager.registerEvents(new Listener() {
 
-                @EventHandler(priority = EventPriority.LOWEST)
-                public void handleLogin(PlayerLoginEvent event) {
-                	networkManagerInjector.getInjector(event.getPlayer()).inject();
-                }
-
                 @EventHandler(priority = EventPriority.LOWEST)
                 public void handleJoin(PlayerJoinEvent event) {
                 	networkManagerInjector.getInjector(event.getPlayer()).inject();
@@ -516,12 +520,25 @@ public class PacketFilterManager implements ListenerManager, InternalManager {
             this.postPacketToListeners(this.outboundListeners, event, true);
         }
     }
+    
+    private boolean requiresMainThread(PacketContainer packet) {
+        return this.hasMainThreadListener(packet.getType()) && !this.server.isPrimaryThread();
+    }
+
+    private void runMonitorListeners(PacketContainer packet, Runnable notifyMonitor) {
+        if (this.requiresMainThread(packet)) {
+            ProtocolLibrary.getScheduler().runTask(notifyMonitor);
+        } else {
+            notifyMonitor.run();
+        }
+    }
 
     private void postPacketToListeners(PacketListenerSet listeners, PacketEvent event, boolean outbound) {
         try {
             // append async marker if any async listener for the packet was registered
             if (this.asyncFilterManager.hasAsynchronousListeners(event)) {
-                event.setAsyncMarker(this.asyncFilterManager.createAsyncMarker());
+                Injector injector = this.networkManagerInjector.getInjector(event.getPlayer());
+                event.setAsyncMarker(this.asyncFilterManager.createAsyncMarker(injector));
             }
 
             // post to sync listeners

src/main/java/com/comphenix/protocol/injector/StructureCache.java

@@ -35,6 +35,7 @@ import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.reflect.accessors.Accessors;
 import com.comphenix.protocol.reflect.accessors.ConstructorAccessor;
 import com.comphenix.protocol.reflect.accessors.FieldAccessor;
+import com.comphenix.protocol.reflect.cloning.ImmutableDetector;
 import com.comphenix.protocol.reflect.fuzzy.FuzzyFieldContract;
 import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
 import com.comphenix.protocol.reflect.instances.DefaultInstances;
@@ -82,15 +83,26 @@ public class StructureCache {
         return newInstance(packetClass);
     }
 
+    // determineBestCreator can re-enter this cache (legacy 1.8 packet registry), which
+    // ConcurrentHashMap.computeIfAbsent rejects on Java 9+, so use get/put instead.
+    private static Optional<Supplier<Object>> creatorFor(Class<?> clazz) {
+        Optional<Supplier<Object>> creator = CACHED_INSTANCE_CREATORS.get(clazz);
+        if (creator == null) {
+            creator = Optional.ofNullable(determineBestCreator(clazz));
+            Optional<Supplier<Object>> existing = CACHED_INSTANCE_CREATORS.putIfAbsent(clazz, creator);
+            if (existing != null) {
+                creator = existing;
+            }
+        }
+        return creator;
+    }
+
     public static boolean canCreateInstance(Class<?> clazz) {
-        Optional<Supplier<Object>> creator = CACHED_INSTANCE_CREATORS.computeIfAbsent(clazz, x ->
-            Optional.ofNullable(determineBestCreator(clazz)));
-        return creator.isPresent();
+        return creatorFor(clazz).isPresent();
     }
 
     public static Object newInstance(Class<?> clazz) {
-        Optional<Supplier<Object>> creator = CACHED_INSTANCE_CREATORS.computeIfAbsent(clazz, x ->
-            Optional.ofNullable(determineBestCreator(clazz)));
+        Optional<Supplier<Object>> creator = creatorFor(clazz);
         if (!creator.isPresent()) {
             throw new IllegalArgumentException("Cannot create instance of " + clazz);
         }
@@ -98,15 +110,21 @@ public class StructureCache {
     }
 
     static Supplier<Object> determineBestCreator(Class<?> clazz) {
-        // certain packets are singletons which can't really be created
-        if (MinecraftReflection.isPacketClass(clazz)) {
+        boolean packetClass = MinecraftReflection.isPacketClass(clazz);
+        boolean immutableClass = ImmutableDetector.isImmutable(clazz);
+
+        // Certain packets are singletons which can't really be created. Immutable classes may also expose multiple
+        // constant instances as an enum replacement, which should be reused instead of invoking their constructors.
+        if (packetClass || immutableClass) {
             FuzzyReflection fuzzy = FuzzyReflection.fromClass(clazz, false);
             List<Field> singletons = fuzzy.getFieldList(FuzzyFieldContract.newBuilder()
                 .typeExact(clazz)
                 .requireModifier(Modifier.STATIC)
                 .requireModifier(Modifier.PUBLIC)
                 .build());
-            if (singletons.size() == 1) {
+
+            // Preserve the existing packet singleton behavior.
+            if (packetClass && singletons.size() == 1) {
                 FieldAccessor accessor = Accessors.getFieldAccessor(singletons.get(0));
                 try {
                     accessor.get(null);
@@ -114,6 +132,23 @@ public class StructureCache {
                 } catch (Exception ignored) {
                 }
             }
+
+            if (immutableClass) {
+                for (Field singleton : singletons) {
+                    if (!Modifier.isFinal(singleton.getModifiers())) {
+                        continue;
+                    }
+
+                    FieldAccessor accessor = Accessors.getFieldAccessor(singleton);
+                    try {
+                        Object instance = accessor.get(null);
+                        if (instance != null) {
+                            return () -> instance;
+                        }
+                    } catch (Exception ignored) {
+                    }
+                }
+            }
         }
 
         try {
@@ -124,7 +159,10 @@ public class StructureCache {
         } catch (Exception ignored) {
         }
 
-        WrappedStreamCodec streamCodec = PacketRegistry.getStreamCodec(clazz);
+        // stream codecs only exist on 1.20.5+; on legacy versions asking the registry re-enters its own
+        // initialization (createOldRegister builds StructureModifiers, which land back here)
+        WrappedStreamCodec streamCodec = MinecraftVersion.v1_20_5.atOrAbove()
+            ? PacketRegistry.getStreamCodec(clazz) : null;
 
         // use the new stream codec for versions above 1.20.5 if possible
         if (streamCodec != null && tryInitTrickDataSerializer()) {
@@ -287,8 +325,8 @@ public class StructureCache {
 
         if (registryByteBuf.isPresent()) {
             ConstructorAccessor accessor = Accessors.getConstructorAccessor(FuzzyReflection.fromClass(serializerBase, true).getConstructor(FuzzyMethodContract.newBuilder()
-                    .parameterDerivedOf(ByteBuf.class)
-                    .parameterDerivedOf(MinecraftReflection.getRegistryAccessClass())
+                    .parameterExactType(ByteBuf.class)
+                    .parameterExactType(MinecraftReflection.getRegistryAccessClass())
                     .build()));
             TRICKED_DATA_SERIALIZER_BASE = (buf) -> accessor.invoke(buf, MinecraftRegistryAccess.get());
         } else {

src/main/java/com/comphenix/protocol/injector/collection/OutboundPacketListenerSet.java

@@ -13,6 +13,7 @@ import com.comphenix.protocol.events.ListeningWhitelist;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.wrappers.Converters;
 
 public class OutboundPacketListenerSet extends PacketListenerSet {
 
@@ -31,38 +32,46 @@ public class OutboundPacketListenerSet extends PacketListenerSet {
 
         if (event.getPacketType() == PacketType.Play.Server.BUNDLE && !event.isCancelled()) {
             // unpack the bundle and invoke for each packet in the bundle
-            Iterable<PacketContainer> packets = event.getPacket().getPacketBundles().read(0);
-            List<PacketContainer> outPackets = new ArrayList<>();
-            for (PacketContainer subPacket : packets) {
-                // ignore null packets as the will throw an error in the packet encoder
-                if (subPacket == null) {
-                    continue;
+            List<PacketContainer> packets = Converters.toList(event.getPacket().getPacketBundles().read(0));
+            // lazily allocated when the first packet is removed or replaced
+            List<PacketContainer> outPackets = null;
+            for (int index = 0; index < packets.size(); index++) {
+                PacketContainer subPacket = packets.get(index);
+                PacketContainer packet = null;
+
+                if (subPacket != null) {
+                    PacketEvent subPacketEvent = PacketEvent.fromServer(this, subPacket, event.getNetworkMarker(),
+                            event.getPlayer(), event.isFiltered(), event);
+                    super.invoke(subPacketEvent, priorityFilter);
+
+                    if (!subPacketEvent.isCancelled()) {
+                        PacketContainer result = subPacketEvent.getPacket();
+                        if (result != null && result.getHandle() != null) {
+                            packet = result;
+                        }
+                    }
                 }
 
-                PacketEvent subPacketEvent = PacketEvent.fromServer(this, subPacket, event.getNetworkMarker(),
-                        event.getPlayer());
-                super.invoke(subPacketEvent, priorityFilter);
-
-                
-                // if the packet has been cancelled, the packet will not be add to the bundle
-                if (subPacketEvent.isCancelled()) {
-                    continue;
+                boolean changed = packet == null || packet.getHandle() != subPacket.getHandle();
+                if (outPackets == null && changed) {
+                    outPackets = new ArrayList<>(packets.size());
+                    outPackets.addAll(packets.subList(0, index));
                 }
-
-                PacketContainer packet = subPacketEvent.getPacket();
-                if (packet == null || packet.getHandle() == null) {
-                    // super.invoke() should prevent us from getting new null packet so we just ignore it here
-                    continue;
-                } else {
+                if (outPackets != null && packet != null) {
                     outPackets.add(packet);
                 }
             }
 
-            if (packets.iterator().hasNext()) {
-                event.getPacket().getPacketBundles().write(0, outPackets);
-            } else {
-                // cancel entire packet if each individual packet has been cancelled
-                event.setCancelled(true);
+            if (!event.isReadOnly() && outPackets != null) {
+                if (!outPackets.isEmpty()) {
+                    // the original bundle may be shared between multiple recipients
+                    PacketContainer bundle = event.getPacket().shallowClone();
+                    bundle.getPacketBundles().write(0, outPackets);
+                    event.setPacket(bundle);
+                } else {
+                    // cancel entire packet if each individual packet has been cancelled
+                    event.setCancelled(true);
+                }
             }
         }
     }

src/main/java/com/comphenix/protocol/injector/netty/Injector.java

@@ -1,6 +1,7 @@
 package com.comphenix.protocol.injector.netty;
 
 import java.net.SocketAddress;
+import java.util.UUID;
 
 import org.bukkit.entity.Player;
 
@@ -67,6 +68,24 @@ public interface Injector {
      */
     Player getPlayer();
 
+    /**
+     * Retrieve the player name captured during login.
+     *
+     * @return The player name, or NULL if it is not known yet.
+     */
+    default String getPlayerName() {
+        return null;
+    }
+
+    /**
+     * Retrieve the player UUID captured during login.
+     *
+     * @return The player UUID, or NULL if it is not available.
+     */
+    default UUID getPlayerUniqueId() {
+        return null;
+    }
+
     /**
      * Set the current player instance.
      *

src/main/java/com/comphenix/protocol/injector/netty/WirePacket.java

@@ -19,10 +19,13 @@ import static com.google.common.base.Preconditions.checkNotNull;
 
 import com.comphenix.protocol.PacketType;
 import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.reflect.accessors.MethodAccessor;
 import com.comphenix.protocol.utility.MinecraftMethods;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.MinecraftVersion;
 import com.comphenix.protocol.utility.StreamSerializer;
+import com.comphenix.protocol.wrappers.CustomPacketPayloadWrapper;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.util.ReferenceCountUtil;
@@ -81,6 +84,11 @@ public class WirePacket {
     public static byte[] bytesFromPacket(PacketContainer packet) {
         checkNotNull(packet, "packet cannot be null!");
 
+        // packets are written by their stream codec since 1.20.5
+        if (MinecraftVersion.v1_20_5.atOrAbove()) {
+            return bytesFromStreamCodec(packet);
+        }
+
         ByteBuf buffer = PacketContainer.createPacketBuffer();
         ByteBuf store = PacketContainer.createPacketBuffer();
 
@@ -107,6 +115,44 @@ public class WirePacket {
         return bytes;
     }
 
+    private static byte[] bytesFromStreamCodec(PacketContainer packet) {
+        // Spigot keeps the data of unknown custom payloads in a buffer and the codec reads from it,
+        // so the reader index is restored to keep the packet writable after this call
+        ByteBuf payloadData = getCustomPayloadData(packet);
+        int readerIndex = payloadData != null ? payloadData.readerIndex() : 0;
+
+        try {
+            ByteBuf buffer = (ByteBuf) packet.serializeToBuffer();
+            return StreamSerializer.getDefault().getBytesAndRelease(buffer);
+        } finally {
+            if (payloadData != null) {
+                payloadData.readerIndex(readerIndex);
+            }
+        }
+    }
+
+    private static ByteBuf getCustomPayloadData(PacketContainer packet) {
+        PacketType type = packet.getType();
+        if (type != PacketType.Play.Server.CUSTOM_PAYLOAD
+                && type != PacketType.Play.Client.CUSTOM_PAYLOAD
+                && type != PacketType.Configuration.Server.CUSTOM_PAYLOAD
+                && type != PacketType.Configuration.Client.CUSTOM_PAYLOAD) {
+            return null;
+        }
+
+        Object payload = packet.getModifier()
+                .withType(CustomPacketPayloadWrapper.getCustomPacketPayloadClass())
+                .readSafely(0);
+        if (payload == null) {
+            return null;
+        }
+
+        StructureModifier<ByteBuf> buffers = new StructureModifier<>(payload.getClass())
+                .withTarget(payload)
+                .withType(ByteBuf.class);
+        return buffers.readSafely(0);
+    }
+
     /**
      * Creates a WirePacket from an existing Minecraft packet
      *
@@ -118,6 +164,10 @@ public class WirePacket {
         checkNotNull(packet, "packet cannot be null!");
         checkArgument(MinecraftReflection.isPacketClass(packet), "packet must be a Minecraft packet");
 
+        if (MinecraftVersion.v1_20_5.atOrAbove()) {
+            return fromPacket(PacketContainer.fromPacket(packet));
+        }
+
         ByteBuf buffer = PacketContainer.createPacketBuffer();
 
         MethodAccessor write = MinecraftMethods.getPacketWriteByteBufMethod();

src/main/java/com/comphenix/protocol/injector/netty/channel/EmptyInjector.java

@@ -1,6 +1,7 @@
 package com.comphenix.protocol.injector.netty.channel;
 
 import java.net.SocketAddress;
+import java.util.UUID;
 
 import org.bukkit.entity.Player;
 
@@ -67,6 +68,16 @@ final class EmptyInjector implements Injector {
         return this.player;
     }
 
+    @Override
+    public String getPlayerName() {
+        return this.player != null ? this.player.getName() : null;
+    }
+
+    @Override
+    public UUID getPlayerUniqueId() {
+        return this.player != null ? this.player.getUniqueId() : null;
+    }
+
     @Override
     public void setPlayer(Player player) {
         this.player = player;

src/main/java/com/comphenix/protocol/injector/netty/channel/NettyChannelInjector.java

@@ -4,7 +4,9 @@ import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.net.SocketAddress;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
+import java.util.UUID;
 import java.util.WeakHashMap;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ConcurrentHashMap;
@@ -29,7 +31,9 @@ import com.comphenix.protocol.injector.NetworkProcessor;
 import com.comphenix.protocol.injector.netty.Injector;
 import com.comphenix.protocol.injector.netty.WirePacket;
 import com.comphenix.protocol.injector.packet.PacketRegistry;
+import com.comphenix.protocol.injector.temporary.TemporaryPlayer;
 import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.reflect.accessors.Accessors;
 import com.comphenix.protocol.reflect.accessors.FieldAccessor;
 import com.comphenix.protocol.reflect.fuzzy.FuzzyFieldContract;
@@ -99,6 +103,7 @@ public class NettyChannelInjector implements Injector {
 
     // information about the player belonging to this injector
     private String playerName;
+    private UUID playerUniqueId;
     private Player player;
 
     // lazy initialized fields, if we don't need them we don't bother about them
@@ -114,6 +119,10 @@ public class NettyChannelInjector implements Injector {
     ) {
         // bukkit stuff
         this.player = player;
+        if (player != null && !(player instanceof TemporaryPlayer)) {
+            this.playerName = player.getName();
+            this.playerUniqueId = player.getUniqueId();
+        }
 
         // protocol lib stuff
         this.errorReporter = errorReporter;
@@ -242,7 +251,7 @@ public class NettyChannelInjector implements Injector {
             this.uninject();
 
             // remove any outgoing references
-            this.channel.attr(INJECTOR).remove();
+            this.channel.attr(INJECTOR).set(null);
 
             // cleanup
             this.savedMarkers.clear();
@@ -289,8 +298,7 @@ public class NettyChannelInjector implements Injector {
         
         this.ensureInEventLoop(() -> {
             try {
-                // try to invoke the method, this should normally not fail
-                this.listenerInvoker.read(packet);
+                this.channel.pipeline().context(INBOUND_INTERCEPTOR_NAME).fireChannelRead(packet);
             } catch (Exception exception) {
                 this.errorReporter.reportWarning(this, Report.newBuilder(REPORT_CANNOT_READ_PACKET)
                         .messageParam(packet, this.playerName)
@@ -344,14 +352,15 @@ public class NettyChannelInjector implements Injector {
     @Override
     public Player getPlayer() {
         // if the player was already resolved there is no need to do further lookups
-        if (this.player != null) {
+        if (this.player != null && !(this.player instanceof TemporaryPlayer)) {
             return this.player;
         }
 
         // check if the name of the player is already known to the injector
         if (this.playerName != null) {
-            this.player = Bukkit.getPlayerExact(this.playerName);
-            if (this.player != null) {
+            Player bukkitPlayer = Bukkit.getPlayerExact(this.playerName);
+            if (bukkitPlayer != null) {
+                this.player = bukkitPlayer;
                 this.injectionFactory.cacheInjector(this.player, this);
             }
         }
@@ -360,12 +369,23 @@ public class NettyChannelInjector implements Injector {
         return this.player;
     }
 
+    @Override
+    public String getPlayerName() {
+        return this.playerName;
+    }
+
+    @Override
+    public UUID getPlayerUniqueId() {
+        return this.playerUniqueId;
+    }
+
     @Override
     public void setPlayer(Player player) {
         this.injectionFactory.invalidate(this.player, this.playerName);
 
         this.player = player;
         this.playerName = player.getName();
+        this.playerUniqueId = player.getUniqueId();
 
         this.injectionFactory.cacheInjector(player, this);
         this.injectionFactory.cacheInjector(player.getName(), this);
@@ -420,14 +440,19 @@ public class NettyChannelInjector implements Injector {
         // process login packets for the player name
         if (packet.getType() == PacketType.Login.Client.START) {
             String username;
+            UUID uniqueId;
             if (MinecraftVersion.WILD_UPDATE.atOrAbove()) {
                 // 1.19 replaced the gameprofile with username and uuid field
                 username = packet.getStrings().readSafely(0);
+                uniqueId = readLoginUniqueId(packet);
             } else {
                 WrappedGameProfile profile = packet.getGameProfiles().readSafely(0);
                 username = profile != null ? profile.getName() : null;
+                uniqueId = profile != null ? profile.getUUID() : null;
             }
 
+            this.playerUniqueId = uniqueId;
+
             if (username != null) {
                 this.playerName = username;
                 this.injectionFactory.cacheInjector(username, this);
@@ -442,6 +467,22 @@ public class NettyChannelInjector implements Injector {
         }
     }
 
+    private static UUID readLoginUniqueId(PacketContainer packet) {
+        UUID uniqueId = packet.getUUIDs().readSafely(0);
+        if (uniqueId != null) {
+            return uniqueId;
+        }
+
+        StructureModifier<Optional> optionals = packet.getModifier().withType(Optional.class);
+        for (int i = 0; i < optionals.size(); i++) {
+            Optional<?> optional = optionals.readSafely(i);
+            if (optional != null && optional.orElse(null) instanceof UUID optionalUniqueId) {
+                return optionalUniqueId;
+            }
+        }
+        return null;
+    }
+
     private void processInboundInternal(ChannelHandlerContext ctx, PacketContainer packetContainer) {
         if (this.listenerManager.hasMainThreadListener(packetContainer.getType()) && !Bukkit.isPrimaryThread()) {
             // not on the main thread but we are required to be reschedule the packet on the
@@ -515,15 +556,16 @@ public class NettyChannelInjector implements Injector {
             return action;
         }
 
+        PacketContainer packetContainer = new PacketContainer(packetType, packet);
+
         // ensure that we are on the main thread if we need to
-        if (this.listenerManager.hasMainThreadListener(packetType) && !Bukkit.isPrimaryThread()) {
+        if (!Bukkit.isPrimaryThread() && hasMainThreadListener(this.listenerManager, protocol, packetContainer)) {
             // not on the main thread but we are required to be - re-schedule the packet on the main thread
-            ProtocolLibrary.getScheduler().runTask(() -> this.sendClientboundPacket(packet, null, true));
+            ProtocolLibrary.getScheduler().runTask(() -> this.sendClientboundPacket(packet, marker, true));
             return null;
         }
 
         // create event and invoke listeners
-        PacketContainer packetContainer = new PacketContainer(packetType, packet);
         PacketEvent event = PacketEvent.fromServer(this, packetContainer, marker, this.player);
         this.listenerManager.invokeOutboundPacketListeners(event);
 
@@ -553,6 +595,44 @@ public class NettyChannelInjector implements Injector {
         return null;
     }
 
+    /**
+     * Checks if a listener that must be called on the main thread is going to be invoked for the given outbound packet.
+     * The packets inside a bundle are posted to their listeners together with the bundle, so their listeners count for
+     * the bundle as well.
+     *
+     * @param listenerManager the listener manager holding the registered listeners.
+     * @param protocol        the current outbound protocol of the connection.
+     * @param packet          the outbound packet.
+     * @return true if the packet must be processed on the main thread, false otherwise.
+     */
+    static boolean hasMainThreadListener(ListenerManager listenerManager, Protocol protocol, PacketContainer packet) {
+        if (listenerManager.hasMainThreadListener(packet.getType())) {
+            return true;
+        }
+
+        if (packet.getType() != PacketType.Play.Server.BUNDLE) {
+            return false;
+        }
+
+        Iterable<?> subPackets = packet.getModifier().<Iterable<?>>withType(Iterable.class).readSafely(0);
+        if (subPackets == null) {
+            return false;
+        }
+
+        for (Object subPacket : subPackets) {
+            if (subPacket == null) {
+                continue;
+            }
+
+            PacketType subPacketType = PacketRegistry.getPacketType(protocol, subPacket.getClass());
+            if (subPacketType != null && listenerManager.hasMainThreadListener(subPacketType)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     @SuppressWarnings("unchecked")
     private <T> T proxyAction(T action, PacketEvent event, NetworkMarker marker) {
         // hack - we only know that the given action is either a runnable or callable, but we need to work out which thing

src/main/java/com/comphenix/protocol/injector/netty/channel/NettyChannelProxy.java

@@ -5,6 +5,7 @@ import io.netty.buffer.ByteBufAllocator;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelConfig;
 import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelId;
 import io.netty.channel.ChannelMetadata;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.ChannelProgressivePromise;
@@ -33,6 +34,11 @@ final class NettyChannelProxy implements Channel {
         this.injector = injector;
     }
 
+    @Override
+    public ChannelId id() {
+        return this.delegate.id();
+    }
+
     @Override
     public EventLoop eventLoop() {
         return this.eventLoop;
@@ -238,6 +244,11 @@ final class NettyChannelProxy implements Channel {
         return this.delegate.attr(key);
     }
 
+    @Override
+    public <T> boolean hasAttr(AttributeKey<T> attributeKey) {
+        return this.delegate.hasAttr(attributeKey);
+    }
+
     @Override
     public int compareTo(@NotNull Channel o) {
         return this.delegate.compareTo(o);

src/main/java/com/comphenix/protocol/injector/netty/channel/NettyEventLoopProxy.java

@@ -10,11 +10,13 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.function.Consumer;
 
+import io.netty.channel.AbstractEventLoop;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelPromise;
 import io.netty.channel.EventLoop;
 import io.netty.channel.EventLoopGroup;
+import io.netty.util.concurrent.AbstractEventExecutor;
 import io.netty.util.concurrent.EventExecutor;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.ProgressivePromise;
@@ -25,7 +27,7 @@ import io.netty.util.concurrent.ScheduledFuture;
  * An abstract event loop implementation which delegates all calls to a given event loop, but proxies all calls which
  * schedule something on the event loop to methods which decide what should happen to the scheduled task.
  */
-final class NettyEventLoopProxy implements EventLoop {
+final class NettyEventLoopProxy extends AbstractEventLoop {
 
     private static final Callable<?> EMPTY_CALLABLE = () -> null;
     private static final Runnable EMPTY_RUNNABLE = () -> {
@@ -236,6 +238,15 @@ final class NettyEventLoopProxy implements EventLoop {
         }
     }
 
+    // ShreddedPaper uses this method
+    @Override
+    public void lazyExecute(Runnable command) {
+        Runnable proxied = this.proxyRunnable(command);
+        if (proxied != null) {
+            ((AbstractEventExecutor)this.delegate).lazyExecute(proxied);
+        }
+    }
+
     @Override
     public void forEach(Consumer<? super EventExecutor> action) {
         this.delegate.forEach(action);
@@ -251,6 +262,12 @@ final class NettyEventLoopProxy implements EventLoop {
         return this.delegate.register(channel);
     }
 
+    @Override
+    public ChannelFuture register(ChannelPromise channelPromise) {
+        return this.delegate.register(channelPromise);
+    }
+
+    @Deprecated
     @Override
     public ChannelFuture register(Channel channel, ChannelPromise promise) {
         return this.delegate.register(channel, promise);

src/main/java/com/comphenix/protocol/injector/netty/channel/PacketListenerInvoker.java

@@ -14,13 +14,11 @@ import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.wrappers.WrappedChatComponent;
 
-import io.netty.channel.ChannelHandlerContext;
-
 /**
  * This class facilitates the invocation of methods on the current packet listener.
- * It attempts to execute the <code>send</code>, <code>read</code>, and <code>disconnect</code> 
- * methods and, upon failure (either due to the absence of the method or the packet 
- * listener being of an incorrect type), it delegates the call to the network manager.
+ * It attempts to execute the <code>send</code>, and <code>disconnect</code> methods, upon failure
+ * (either due to the absence of the method or the packet listener being of an incorrect type),
+ * it delegates the call to the network manager.
  * 
  * <p>Supported packet listener types include CONFIGURATION and PLAY. If the packet
  * listener does not match these types, or if the required method is missing, the 
@@ -43,7 +41,6 @@ public class PacketListenerInvoker {
     private static final boolean DOES_PACKET_LISTENER_DISCONNECT_USE_COMPONENT = doesPacketListenerDisconnectUseComponent();
 
     private static final MethodAccessor NETWORK_MANAGER_SEND = getNetworkManagerSend();
-    private static final MethodAccessor NETWORK_MANAGER_READ = getNetworkManagerRead();
     private static final MethodAccessor NETWORK_MANAGER_DISCONNECT = getNetworkManagerDisconnect();
     private static final MethodAccessor NETWORK_MANAGER_PACKET_LISTENER = getNetworkManagerPacketListener();
 
@@ -117,15 +114,6 @@ public class PacketListenerInvoker {
         return Accessors.getMethodAccessor(send);
     }
 
-    private static MethodAccessor getNetworkManagerRead() {
-        FuzzyReflection networkManager = FuzzyReflection.fromClass(MinecraftReflection.getNetworkManagerClass(), true);
-
-        Method read = networkManager
-            .getMethodByParameters("read", ChannelHandlerContext.class, MinecraftReflection.getPacketClass());
-
-        return Accessors.getMethodAccessor(read);
-    }
-
     private static MethodAccessor getNetworkManagerDisconnect() {
         FuzzyReflection networkManager = FuzzyReflection.fromClass(MinecraftReflection.getNetworkManagerClass());
 
@@ -190,7 +178,7 @@ public class PacketListenerInvoker {
     }
 
     /**
-     * Sends a packet using the current packet listener if available and valid; otherwise, 
+     * Sends a packet using the current packet listener if available and valid; otherwise,
      * falls back to the network manager.
      *
      * @param packet The packet to be sent.
@@ -204,15 +192,6 @@ public class PacketListenerInvoker {
         }
     }
 
-    /**
-     * Reads a packet directly using the network manager.
-     *
-     * @param packet The packet to be read.
-     */
-    public void read(Object packet) {
-        NETWORK_MANAGER_READ.invoke(this.networkManager, null, packet);
-    }
-
     /**
      * Disconnects the player using the current packet listener if available and valid; otherwise, 
      * falls back to the network manager.

src/main/java/com/comphenix/protocol/injector/netty/manager/NetworkManagerInjector.java

@@ -15,6 +15,7 @@ import com.comphenix.protocol.error.ErrorReporter;
 import com.comphenix.protocol.injector.ListenerManager;
 import com.comphenix.protocol.injector.netty.Injector;
 import com.comphenix.protocol.injector.netty.channel.InjectionFactory;
+import com.comphenix.protocol.internal.PlatformProvider;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.accessors.Accessors;
 import com.comphenix.protocol.reflect.accessors.FieldAccessor;
@@ -23,7 +24,9 @@ import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.wrappers.Pair;
 
+import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandler;
 
 public class NetworkManagerInjector {
 
@@ -36,7 +39,9 @@ public class NetworkManagerInjector {
     private final InjectionFactory injectionFactory;
 
     // netty handler
+    private final InjectionChannelInboundHandler injectionHandler;
     private final InjectionChannelInitializer pipelineInjectorHandler;
+    private Runnable paperChannelInitializerCleanup;
 
     // status of this injector
     private boolean closed = false;
@@ -47,22 +52,35 @@ public class NetworkManagerInjector {
         this.injectionFactory = new InjectionFactory(plugin, reporter, listenerManager);
 
         // hooking netty handlers
-        InjectionChannelInboundHandler injectionHandler = new InjectionChannelInboundHandler(
+        this.injectionHandler = new InjectionChannelInboundHandler(
                 this.errorReporter,
                 this.injectionFactory);
-        this.pipelineInjectorHandler = new InjectionChannelInitializer(INBOUND_INJECT_HANDLER_NAME, injectionHandler);
+        this.pipelineInjectorHandler = new InjectionChannelInitializer(
+                INBOUND_INJECT_HANDLER_NAME,
+                this.injectionHandler);
     }
 
     public Injector getInjector(Player player) {
     	return this.injectionFactory.fromPlayer(player);
     }
 
+    public boolean isUsingPaperChannelInitializer() {
+        return this.paperChannelInitializerCleanup != null;
+    }
+
     @SuppressWarnings("unchecked")
     public void inject() {
         if (this.closed || this.injected) {
             return;
         }
 
+        PlatformProvider platformProvider = PlatformProvider.get();
+        if (platformProvider.hasEarlyChannelInitialization()) {
+            this.paperChannelInitializerCleanup = platformProvider.registerChannelInitializer(this::injectChannel);
+            this.injected = true;
+            return;
+        }
+
         // get all "server connections" defined in the minecraft server class
         FuzzyReflection server = FuzzyReflection.fromClass(MinecraftReflection.getMinecraftServerClass());
         List<Method> serverConnectionGetter = server.getMethodList(FuzzyMethodContract.newBuilder()
@@ -125,6 +143,23 @@ public class NetworkManagerInjector {
         this.injected = true;
     }
 
+    private void injectChannel(Channel channel) {
+        addInjectionHandler(channel, MinecraftReflection.getNetworkManagerClass(), this.injectionHandler);
+    }
+
+    static void addInjectionHandler(Channel channel, Class<?> networkManagerClass, ChannelHandler injectionHandler) {
+        for (String handlerName : channel.pipeline().names()) {
+            ChannelHandler handler = channel.pipeline().get(handlerName);
+            if (networkManagerClass.isInstance(handler)) {
+                channel.pipeline().addBefore(handlerName, INBOUND_INJECT_HANDLER_NAME, injectionHandler);
+                return;
+            }
+        }
+
+        // Preserve the existing behavior for forks with an unexpected pipeline layout.
+        channel.pipeline().addLast(INBOUND_INJECT_HANDLER_NAME, injectionHandler);
+    }
+
     public void close() {
         if (this.closed || !this.injected) {
             return;
@@ -153,6 +188,13 @@ public class NetworkManagerInjector {
 
         // clear up
         this.overriddenLists.clear();
-        this.injectionFactory.close();
+        try {
+            if (this.paperChannelInitializerCleanup != null) {
+                this.paperChannelInitializerCleanup.run();
+            }
+        } finally {
+            this.paperChannelInitializerCleanup = null;
+            this.injectionFactory.close();
+        }
     }
 }

src/main/java/com/comphenix/protocol/injector/packet/PacketRegistry.java

@@ -19,8 +19,6 @@ package com.comphenix.protocol.injector.packet;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
-import java.lang.reflect.ParameterizedType;
-import java.lang.reflect.Type;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -31,18 +29,15 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.function.Function;
 
 import javax.annotation.Nullable;
 
 import com.comphenix.protocol.PacketType;
 import com.comphenix.protocol.PacketType.Sender;
 import com.comphenix.protocol.ProtocolLogger;
+import com.comphenix.protocol.injector.packet.internal.ProtocolRegistry_1_20_5;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.StructureModifier;
-import com.comphenix.protocol.reflect.accessors.Accessors;
-import com.comphenix.protocol.reflect.accessors.FieldAccessor;
-import com.comphenix.protocol.reflect.accessors.MethodAccessor;
 import com.comphenix.protocol.reflect.fuzzy.FuzzyClassContract;
 import com.comphenix.protocol.reflect.fuzzy.FuzzyFieldContract;
 import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
@@ -70,7 +65,7 @@ public class PacketRegistry {
      * 
      * @author Kristian
      */
-    private static class Register {
+    public static class Register {
         // The main lookup table
         final Map<PacketType, Optional<Class<?>>> typeToClass = new ConcurrentHashMap<>();
 
@@ -82,14 +77,18 @@ public class PacketRegistry {
         volatile Set<PacketType> clientPackets = new HashSet<>();
         final List<MapContainer> containers = new ArrayList<>();
 
-        public Register() {
+        private Register() {
         }
 
-        public void registerPacket(PacketType type, Class<?> clazz, Sender sender) {
-            typeToClass.put(type, Optional.of(clazz));
+        public void registerPacket(PacketType type, Class<?> packetClass, Sender sender, WrappedStreamCodec codec) {
+            typeToClass.put(type, Optional.of(packetClass));
+            classToType.put(packetClass, type);
 
-            classToType.put(clazz, type);
-            protocolClassToType.computeIfAbsent(type.getProtocol(), __ -> new ConcurrentHashMap<>()).put(clazz, type);
+            if (codec != null) {
+                classToCodec.put(packetClass, codec);
+            }
+
+            protocolClassToType.computeIfAbsent(type.getProtocol(), __ -> new ConcurrentHashMap<>()).put(packetClass, type);
 
             if (sender == Sender.CLIENT) {
                 clientPackets.add(type);
@@ -293,206 +292,9 @@ public class PacketRegistry {
         return result;
     }
 
-    @SuppressWarnings("unchecked")
     private static synchronized Register createRegisterV1_20_5() {
-        Object[] protocols = ENUM_PROTOCOL.getEnumConstants();
-
-        // PacketType<?> to class map
-        final Map<Object, Class<?>> packetTypeMap = new HashMap<>();
-
-        // List of all class containing PacketTypes
-        String[] packetTypesClassNames = new String[] {
-                "common.CommonPacketTypes",
-                "configuration.ConfigurationPacketTypes",
-                "cookie.CookiePacketTypes",
-                "game.GamePacketTypes",
-                "handshake.HandshakePacketTypes",
-                "login.LoginPacketTypes",
-                "ping.PingPacketTypes",
-                "status.StatusPacketTypes"
-        };
-
-        Class<?> packetTypeClass = MinecraftReflection.getMinecraftClass("network.protocol.PacketType");
-
-        for (String packetTypesClassName : packetTypesClassNames) {
-            Class<?> packetTypesClass = MinecraftReflection
-                    .getOptionalNMS("network.protocol." + packetTypesClassName)
-                    .orElse(null);
-            if (packetTypesClass == null) {
-                ProtocolLogger.debug("Can't find PacketType class: {0}, will skip it", packetTypesClassName);
-                continue;
-            }
-
-            // check every field for "static final PacketType<?>"
-            for (Field field : packetTypesClass.getDeclaredFields()) {
-                try {
-                    if (!Modifier.isFinal(field.getModifiers()) || !Modifier.isStatic(field.getModifiers())) {
-                        continue;
-                    }
-
-                    Object packetType = field.get(null);
-                    if (!packetTypeClass.isInstance(packetType)) {
-                        continue;
-                    }
-
-                    // retrieve the generic type T of the PacketType<T> field
-                    Type packet = ((ParameterizedType) field.getGenericType()).getActualTypeArguments()[0];
-                    if (packet instanceof Class<?>) {
-                        packetTypeMap.put(packetType, (Class<?>) packet);
-                    }
-                } catch (Exception e) {
-                    e.printStackTrace();
-                    continue;
-                }
-            }
-        }
-
-        // ID to Packet class maps
-        final Map<Object, Map<Class<?>, Integer>> serverMaps = new LinkedHashMap<>();
-        final Map<Object, Map<Class<?>, Integer>> clientMaps = new LinkedHashMap<>();
-
-        // global registry instance
         final Register result = new Register();
-
-        // List of all class containing ProtocolInfos
-        String[] protocolClassNames = new String[] {
-                "configuration.ConfigurationProtocols",
-                "game.GameProtocols",
-                "handshake.HandshakeProtocols",
-                "login.LoginProtocols",
-                "status.StatusProtocols"
-        };
-
-        Class<?> protocolInfoClass = MinecraftReflection.getProtocolInfoClass();
-        Class<?> protocolInfoUnboundClass = MinecraftReflection.getProtocolInfoUnboundClass();
-        Class<?> streamCodecClass = MinecraftReflection.getStreamCodecClass();
-        Class<?> idCodecClass = MinecraftReflection.getMinecraftClass("network.codec.IdDispatchCodec");
-        Class<?> idCodecEntryClass = MinecraftReflection.getMinecraftClass("network.codec.IdDispatchCodec$Entry", "network.codec.IdDispatchCodec$b");
-        Class<?> protocolDirectionClass = MinecraftReflection.getPacketFlowClass();
-
-        Function<?, ?> emptyFunction = input -> input;
-
-        FuzzyReflection protocolInfoReflection = FuzzyReflection.fromClass(protocolInfoClass);
-
-        MethodAccessor protocolAccessor = Accessors.getMethodAccessor(protocolInfoReflection
-                .getMethodByReturnTypeAndParameters("id", MinecraftReflection.getEnumProtocolClass(), new Class[0]));
-
-        MethodAccessor directionAccessor = Accessors.getMethodAccessor(protocolInfoReflection
-                .getMethodByReturnTypeAndParameters("flow", protocolDirectionClass, new Class[0]));
-
-        MethodAccessor codecAccessor = Accessors.getMethodAccessor(
-                protocolInfoReflection.getMethodByReturnTypeAndParameters("codec", streamCodecClass, new Class[0]));
-
-        MethodAccessor bindAccessor = Accessors.getMethodAccessor(FuzzyReflection.fromClass(protocolInfoUnboundClass)
-                .getMethodByReturnTypeAndParameters("bind", protocolInfoClass, new Class[] { Function.class }));
-
-        FuzzyReflection idCodecReflection = FuzzyReflection.fromClass(idCodecClass, true);
-
-        FieldAccessor byIdAccessor = Accessors.getFieldAccessor(idCodecReflection
-                .getField(FuzzyFieldContract.newBuilder().typeDerivedOf(List.class).build()));
-
-        FieldAccessor toIdAccessor = Accessors.getFieldAccessor(idCodecReflection
-                .getField(FuzzyFieldContract.newBuilder().typeDerivedOf(Map.class).build()));
-
-        FuzzyReflection idCodecEntryReflection = FuzzyReflection.fromClass(idCodecEntryClass, true);
-
-        MethodAccessor idCodecEntryTypeAccessor = Accessors.getMethodAccessor(idCodecEntryReflection
-                .getMethodByReturnTypeAndParameters("type", Object.class, new Class[0]));
-
-        MethodAccessor idCodecEntrySerializerAccessor = Accessors.getMethodAccessor(idCodecEntryReflection
-                .getMethodByReturnTypeAndParameters("serializer", streamCodecClass, new Class[0]));
-
-        for (String protocolClassName : protocolClassNames) {
-            Class<?> protocolClass = MinecraftReflection
-                    .getOptionalNMS("network.protocol." + protocolClassName)
-                    .orElse(null);
-            if (protocolClass == null) {
-                ProtocolLogger.debug("Can't find protocol class: {0}, will skip it", protocolClassName);
-                continue;
-            }
-
-            for (Field field : protocolClass.getDeclaredFields()) {
-                try {
-                    // ignore none static and final fields
-                    if (!Modifier.isFinal(field.getModifiers()) || !Modifier.isStatic(field.getModifiers())) {
-                        continue;
-                    }
-
-                    Object protocolInfo = field.get(null);
-
-                    // bind unbound ProtocolInfo to empty function to get real ProtocolInfo
-                    if (protocolInfoUnboundClass.isInstance(protocolInfo)) {
-                        protocolInfo = bindAccessor.invoke(protocolInfo, new Object[] { emptyFunction });
-                    }
-
-                    // ignore any field that isn't a ProtocolInfo
-                    if (!protocolInfoClass.isInstance(protocolInfo)) {
-                        continue;
-                    }
-
-                    // get codec and check if codec is instance of IdDispatchCodec
-                    // since that is the only support codec as of now
-                    Object codec = codecAccessor.invoke(protocolInfo);
-                    if (!idCodecClass.isInstance(codec)) {
-                        continue;
-                    }
-
-                    // retrieve packetTypeMap and convert it to packetIdMap
-                    Map<Class<?>, Integer> packetMap = new HashMap<>();
-                    List<Object> serializerList = (List<Object>) byIdAccessor.get(codec);
-                    Map<Object, Integer> packetTypeIdMap = (Map<Object, Integer>) toIdAccessor.get(codec);
-
-                    for (Map.Entry<Object, Integer> entry : packetTypeIdMap.entrySet()) {
-                        Class<?> packetClass = packetTypeMap.get(entry.getKey());
-                        if (packetClass == null) {
-                            throw new RuntimeException("packetType missing packet " + entry.getKey());
-                        }
-
-                        packetMap.put(packetClass, entry.getValue());
-                    }
-
-                    // retrieve packet codecs for packet construction and write methods
-                    for (Object entry : serializerList) {
-                        Object packetType = idCodecEntryTypeAccessor.invoke(entry);
-
-                        Class<?> packetClass = packetTypeMap.get(packetType);
-                        if (packetClass == null) {
-                            throw new RuntimeException("packetType missing packet " + packetType);
-                        }
-
-                        Object serializer = idCodecEntrySerializerAccessor.invoke(entry);
-                        result.classToCodec.put(packetClass, new WrappedStreamCodec(serializer));
-                    }
-
-                    // get EnumProtocol and Direction of protocol info
-                    Object protocol = protocolAccessor.invoke(protocolInfo);
-                    String direction = directionAccessor.invoke(protocolInfo).toString();
-
-                    if (direction.contains("CLIENTBOUND")) { // Sent by Server
-                        serverMaps.put(protocol, packetMap);
-                    } else if (direction.contains("SERVERBOUND")) { // Sent by Client
-                        clientMaps.put(protocol, packetMap);
-                    }
-                } catch (Exception e) {
-                    e.printStackTrace();
-                    continue;
-                }
-            }
-        }
-
-        for (Object protocol : protocols) {
-            Enum<?> enumProtocol = (Enum<?>) protocol;
-            PacketType.Protocol equivalent = PacketType.Protocol.fromVanilla(enumProtocol);
-
-            // Associate known types
-            if (serverMaps.containsKey(protocol)) {
-                associatePackets(result, reverse(serverMaps.get(protocol)), equivalent, Sender.SERVER);
-            }
-            if (clientMaps.containsKey(protocol)) {
-                associatePackets(result, reverse(clientMaps.get(protocol)), equivalent, Sender.CLIENT);
-            }
-        }
-
+        ProtocolRegistry_1_20_5.fillRegister(result);
         return result;
     }
 
@@ -517,7 +319,7 @@ public class PacketRegistry {
             PacketType type = PacketType.fromCurrent(protocol, sender, packetId, packetClass);
 
             try {
-                register.registerPacket(type, packetClass, sender);
+                register.registerPacket(type, packetClass, sender, null);
             } catch (Exception ex) {
                 ProtocolLogger.debug("Encountered an exception associating packet " + type, ex);
             }
@@ -610,8 +412,8 @@ public class PacketRegistry {
     private static Class<?> searchForPacket(List<String> classNames) {
         for (String name : classNames) {
             try {
-                Class<?> clazz = MinecraftReflection.getMinecraftClass(name);
-                if (MinecraftReflection.getPacketClass().isAssignableFrom(clazz)
+                Class<?> clazz = resolvePacketClassName(name);
+                if (clazz != null && MinecraftReflection.getPacketClass().isAssignableFrom(clazz)
                         && !Modifier.isAbstract(clazz.getModifiers())) {
                     return clazz;
                 }
@@ -622,6 +424,22 @@ public class PacketRegistry {
         return null;
     }
 
+    /**
+     * Resolve a single packet class name. Fully-qualified names (those already containing their
+     * package, e.g. {@code net.minecraft.network.protocol.game.XPacket}) are loaded directly, since
+     * {@link MinecraftReflection#getMinecraftClass(String)} would otherwise prepend the Minecraft
+     * package and fail to find them. Relative names continue to be resolved against the Minecraft
+     * package.
+     */
+    private static Class<?> resolvePacketClassName(String name) {
+        Optional<Class<?>> direct = MinecraftReflection.getOptionalClass(name);
+        if (direct.isPresent()) {
+            return direct.get();
+        }
+
+        return MinecraftReflection.getMinecraftClass(name);
+    }
+
     /**
      * Retrieves the correct packet class from a given type.
      *

src/main/java/com/comphenix/protocol/injector/packet/internal/IdCodecWrapper.java

@@ -0,0 +1,71 @@
+package com.comphenix.protocol.injector.packet.internal;
+
+import java.util.Arrays;
+import java.util.List;
+
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.reflect.accessors.FieldAccessor;
+import com.comphenix.protocol.reflect.accessors.MethodAccessor;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyFieldContract;
+import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.wrappers.AbstractWrapper;
+import com.comphenix.protocol.wrappers.WrappedStreamCodec;
+
+/**
+ * Class only works for version 1.20.5+
+ */
+public class IdCodecWrapper extends AbstractWrapper {
+
+    private static final Class<?> ID_CODEC_CLASS;
+    private static final FieldAccessor BY_ID_ACCESSOR;
+
+    private static final Class<?> ID_CODEC_ENTRY_CLASS;
+    private static final MethodAccessor ENTRY_TYPE_ACCESSOR;
+    private static final MethodAccessor ENTRY_SERIALIZER_ACCESSOR;
+
+    static {
+        ID_CODEC_CLASS = MinecraftReflection.getMinecraftClass("network.codec.IdDispatchCodec");
+        BY_ID_ACCESSOR = Accessors.getFieldAccessor(FuzzyReflection.fromClass(ID_CODEC_CLASS, true)
+                .getField(FuzzyFieldContract.newBuilder().typeDerivedOf(List.class).build()));
+
+        ID_CODEC_ENTRY_CLASS = Arrays.stream(ID_CODEC_CLASS.getNestMembers())
+            .filter(Class::isRecord)
+            .findFirst()
+            .orElseThrow(() -> new RuntimeException("Failed to find entry class for: " + ID_CODEC_CLASS));
+
+        FuzzyReflection entryReflection = FuzzyReflection.fromClass(ID_CODEC_ENTRY_CLASS, true);
+        ENTRY_TYPE_ACCESSOR = Accessors.getMethodAccessor(entryReflection
+                .getMethodByReturnTypeAndParameters("type", Object.class, new Class[0]));
+        ENTRY_SERIALIZER_ACCESSOR = Accessors.getMethodAccessor(entryReflection
+                .getMethodByReturnTypeAndParameters("serializer", MinecraftReflection.getStreamCodecClass(), new Class[0]));
+    }
+
+    public IdCodecWrapper(Object handle) {
+        super(ID_CODEC_CLASS);
+        setHandle(handle);
+    }
+
+    public List<Entry> getById() {
+        // list represents a packet-id to {type, codec} lookup
+        List<?> byId = (List<?>) BY_ID_ACCESSOR.get(this.handle);
+        return byId.stream().map(Entry::new).toList();
+    }
+
+    public class Entry extends AbstractWrapper {
+
+        public Entry(Object handle) {
+            super(ID_CODEC_ENTRY_CLASS);
+            setHandle(handle);
+        }
+
+        public Object type() {
+            return ENTRY_TYPE_ACCESSOR.invoke(this.handle);
+        }
+
+        public WrappedStreamCodec serializer() {
+            Object serializer = ENTRY_SERIALIZER_ACCESSOR.invoke(this.handle);
+            return new WrappedStreamCodec(serializer);
+        }
+    }
+}

src/main/java/com/comphenix/protocol/injector/packet/internal/ProtocolContexts.java

@@ -0,0 +1,44 @@
+package com.comphenix.protocol.injector.packet.internal;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+
+import com.comphenix.protocol.utility.MinecraftReflection;
+
+/**
+ * Class only works for version 1.21.5+
+ */
+public class ProtocolContexts {
+
+    private static final Class<?> GAME_PROTOCOL_CONTEXT_CLASS;
+
+    static {
+        GAME_PROTOCOL_CONTEXT_CLASS = MinecraftReflection.getNullableNMS(
+                "network.protocol.game.GameProtocols$a" /*Spigot Mapping*/,
+                "network.protocol.game.GameProtocols$Context" /*Mojang Mapping*/);
+    }
+
+    public static Object createGameProtocolContext() {
+        return createContext(GAME_PROTOCOL_CONTEXT_CLASS, (proxy, method, args) -> {
+            if (method.getName().equals("hasInfiniteMaterials") || (method.getReturnType() == boolean.class && method.getParameterCount() == 0)) {
+                return true;
+            }
+            return null;
+        });
+    }
+
+    private static Object createContext(Class<?> interfaceClass, InvocationHandler handler) {
+    	if (interfaceClass == null) {
+    		return null;
+    	}
+
+        return Proxy.newProxyInstance(ProtocolContexts.class.getClassLoader(), new Class[] { interfaceClass }, new InvocationHandler() {
+
+            @Override
+            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+                return handler.invoke(proxy, method, args);
+            }
+        });
+    }
+}

src/main/java/com/comphenix/protocol/injector/packet/internal/ProtocolInfoWrapper.java

@@ -0,0 +1,102 @@
+package com.comphenix.protocol.injector.packet.internal;
+
+import java.util.Objects;
+import java.util.function.Function;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.reflect.accessors.MethodAccessor;
+import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.wrappers.AbstractWrapper;
+
+/**
+ * Class only works for version 1.20.5+
+ */
+public class ProtocolInfoWrapper extends AbstractWrapper {
+
+    private static final @NotNull Class<?> SIMPLE_UNBOUND_PROTOCOL_CLASS;
+    private static final @NotNull MethodAccessor BIND_SIMPLE_ACCESSOR;
+
+    private static final @Nullable Class<?> UNBOUND_PROTOCOL_CLASS;
+    private static final @Nullable MethodAccessor BIND_CONTEXT_ACCESSOR;
+
+    private static final @NotNull MethodAccessor ID_ACCESSOR;
+    private static final @NotNull MethodAccessor FLOW_ACCESSOR;
+    private static final @NotNull MethodAccessor CODEC_ACCESSOR;
+
+    static {
+        SIMPLE_UNBOUND_PROTOCOL_CLASS = MinecraftReflection.getMinecraftClass(
+                "network.protocol.SimpleUnboundProtocol" /* 1.21.5+ */,
+                "network.protocol.UnboundProtocol" /* 1.21.8+ Alternative */,
+                "network.ProtocolInfo$a" /* Spigot Mappings */,
+                "network.ProtocolInfo$Unbound" /* Mojang Mappings */);
+        BIND_SIMPLE_ACCESSOR = Accessors.getMethodAccessor(FuzzyReflection.fromClass(SIMPLE_UNBOUND_PROTOCOL_CLASS)
+                .getMethodByReturnTypeAndParameters("bind", MinecraftReflection.getProtocolInfoClass(), new Class[] { Function.class }));
+
+        UNBOUND_PROTOCOL_CLASS = MinecraftReflection.getNullableNMS("network.protocol.UnboundProtocol");
+        if (UNBOUND_PROTOCOL_CLASS != null) {
+            BIND_CONTEXT_ACCESSOR = Accessors.getMethodAccessor(FuzzyReflection.fromClass(UNBOUND_PROTOCOL_CLASS)
+                    .getMethodByReturnTypeAndParameters("bind", MinecraftReflection.getProtocolInfoClass(), new Class[] { Function.class, Object.class }));
+        } else {
+            BIND_CONTEXT_ACCESSOR = null;
+        }
+
+        FuzzyReflection protocolInfoReflection = FuzzyReflection.fromClass(MinecraftReflection.getProtocolInfoClass());
+        ID_ACCESSOR = Accessors.getMethodAccessor(protocolInfoReflection
+                .getMethodByReturnTypeAndParameters("id", MinecraftReflection.getEnumProtocolClass(), new Class[0]));
+        FLOW_ACCESSOR = Accessors.getMethodAccessor(protocolInfoReflection
+                .getMethodByReturnTypeAndParameters("flow", MinecraftReflection.getPacketFlowClass(), new Class[0]));
+        CODEC_ACCESSOR = Accessors.getMethodAccessor(protocolInfoReflection
+                .getMethodByReturnTypeAndParameters("codec", MinecraftReflection.getStreamCodecClass(), new Class[0]));
+    }
+
+    public static boolean isUnboundProtocol(Object protocol) {
+        return SIMPLE_UNBOUND_PROTOCOL_CLASS.isInstance(protocol) || (UNBOUND_PROTOCOL_CLASS != null && UNBOUND_PROTOCOL_CLASS.isInstance(protocol));
+    }
+
+    public static ProtocolInfoWrapper fromUnbound(Object protocol, Object context) {
+        // bind to identity function in-order to map directly to FriendlyByteBuf instead of ByteBuf
+
+        if (SIMPLE_UNBOUND_PROTOCOL_CLASS.isInstance(protocol)) {
+            Object protocolInfo = BIND_SIMPLE_ACCESSOR.invoke(protocol, Function.identity());
+            return new ProtocolInfoWrapper(protocolInfo);
+        }
+
+        if (UNBOUND_PROTOCOL_CLASS != null && UNBOUND_PROTOCOL_CLASS.isInstance(protocol)) {
+            Object protocolInfo = BIND_CONTEXT_ACCESSOR.invoke(protocol, Function.identity(), Objects.requireNonNull(context));
+            return new ProtocolInfoWrapper(protocolInfo);
+        }
+
+        throw new RuntimeException("Unknown protocol implementation: " + protocol);
+    }
+
+    private ProtocolInfoWrapper(Object handle) {
+        super(MinecraftReflection.getProtocolInfoClass());
+        setHandle(handle);
+    }
+
+    public PacketType.Protocol id() {
+        Object protocol = ID_ACCESSOR.invoke(this.handle);
+        return PacketType.Protocol.fromVanilla((Enum<?>) protocol);
+    }
+
+    public PacketType.Sender flow() {
+        String packetFlow = FLOW_ACCESSOR.invoke(this.handle).toString();
+
+        if (packetFlow.contains("CLIENTBOUND")) {
+            return PacketType.Sender.SERVER;
+        } else if (packetFlow.contains("SERVERBOUND")) {
+            return PacketType.Sender.CLIENT;
+        }
+
+        throw new RuntimeException("Unknown packet flow: " + packetFlow);
+    }
+
+    public IdCodecWrapper codec() {
+        return new IdCodecWrapper(CODEC_ACCESSOR.invoke(this.handle));
+    }
+}

src/main/java/com/comphenix/protocol/injector/packet/internal/ProtocolRegistry_1_20_5.java

@@ -0,0 +1,150 @@
+package com.comphenix.protocol.injector.packet.internal;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Supplier;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLogger;
+import com.comphenix.protocol.injector.packet.PacketRegistry.Register;
+import com.comphenix.protocol.utility.MinecraftReflection;
+
+/**
+ * Class only works for version 1.20.5+
+ */
+public class ProtocolRegistry_1_20_5 {
+
+    private static final Class<?> PACKET_TYPE_CLASS = MinecraftReflection.getMinecraftClass("network.protocol.PacketType");;
+
+    /**
+     * List of all class containing PacketTypes
+     */
+    public static final List<String> PACKET_TYPES_CLASS_NAMES = List.of(
+            "common.CommonPacketTypes",
+            "configuration.ConfigurationPacketTypes",
+            "cookie.CookiePacketTypes",
+            "game.GamePacketTypes",
+            "handshake.HandshakePacketTypes",
+            "login.LoginPacketTypes",
+            "ping.PingPacketTypes",
+            "status.StatusPacketTypes");
+
+    /**
+     * List of all class containing ProtocolInfos
+     */
+    public static final List<Protocol> PROTOCOLS = List.of(
+            new Protocol("configuration.ConfigurationProtocols", null),
+            new Protocol("game.GameProtocols", ProtocolContexts::createGameProtocolContext),
+            new Protocol("handshake.HandshakeProtocols", null),
+            new Protocol("login.LoginProtocols", null),
+            new Protocol("status.StatusProtocols", null));
+
+    public static void fillRegister(Register register) {
+        final Map<Object, Class<?>> packetTypeMap = getPacketTypes();
+
+        for (Protocol protocol : PROTOCOLS) {
+            Class<?> protocolClass = MinecraftReflection.getNullableNMS("network.protocol." + protocol.className());
+            if (protocolClass == null) {
+                ProtocolLogger.debug("Can't find protocol class: {0}, will skip it", protocol);
+                continue;
+            }
+
+            for (Field field : protocolClass.getDeclaredFields()) {
+                try {
+                    // ignore none static and final fields
+                    if (!Modifier.isFinal(field.getModifiers()) || !Modifier.isStatic(field.getModifiers())) {
+                        continue;
+                    }
+
+                    Object fieldValue = field.get(null);
+                    
+                    // Skip any field that isn't a unbound ProtocolInfo.
+                    // We need to bind the ProtocolInfo ourself as we apply our own stream mapping
+                    // inside the ProtocolInfoWrapper::fromUnbound method
+                    if (!ProtocolInfoWrapper.isUnboundProtocol(fieldValue)) {
+                        continue;
+                    }
+
+                    // create optional context object to bind protocol to
+                    Object context = protocol.context() != null
+                            ? protocol.context().get()
+                            : null;
+
+                    // wrap bound protocol info for ease of use
+                    ProtocolInfoWrapper protocolInfo = ProtocolInfoWrapper.fromUnbound(fieldValue, context);
+                    PacketType.Protocol packetProtocol = protocolInfo.id();
+                    PacketType.Sender packetSender = protocolInfo.flow();
+
+                    // register each packet to Register instance
+                    List<IdCodecWrapper.Entry> entries = protocolInfo.codec().getById();
+                    for (int id = 0; id < entries.size(); id++) {
+                        IdCodecWrapper.Entry entry = entries.get(id);
+
+                        Class<?> packetClass = packetTypeMap.get(entry.type());
+                        if (packetClass == null) {
+                            throw new RuntimeException("packetType missing packet " + entry.type());
+                        }
+
+                        PacketType packetType = PacketType.fromCurrent(packetProtocol, packetSender, id, packetClass);
+                        // TODO(fix): validate that every codec expects FriendlyByteBuf
+                        register.registerPacket(packetType, packetClass, packetSender, entry.serializer());
+                    }
+                } catch (Exception e) {
+                    e.printStackTrace();
+                    continue;
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns a PacketType to packet class lookup map
+     */
+    private static Map<Object, Class<?>> getPacketTypes() {
+        Map<Object, Class<?>> packetTypeMap = new HashMap<>();
+
+        for (String packetTypesClassName : PACKET_TYPES_CLASS_NAMES) {
+            Class<?> packetTypesClass = MinecraftReflection.getNullableNMS("network.protocol." + packetTypesClassName);
+            if (packetTypesClass == null) {
+                ProtocolLogger.debug("Can't find PacketType class: {0}, will skip it", packetTypesClassName);
+                continue;
+            }
+
+            // check every field for "static final PacketType<?>"
+            for (Field field : packetTypesClass.getDeclaredFields()) {
+                try {
+                    if (!Modifier.isFinal(field.getModifiers()) || !Modifier.isStatic(field.getModifiers())) {
+                        continue;
+                    }
+
+                    Object packetType = field.get(null);
+                    if (!PACKET_TYPE_CLASS.isInstance(packetType)) {
+                        continue;
+                    }
+
+                    // retrieve the generic type T of the PacketType<T> field
+                    Type packet = ((ParameterizedType) field.getGenericType()).getActualTypeArguments()[0];
+                    if (packet instanceof Class<?>) {
+                        packetTypeMap.put(packetType, (Class<?>) packet);
+                    }
+                } catch (Exception e) {
+                    e.printStackTrace();
+                    continue;
+                }
+            }
+        }
+
+        return packetTypeMap;
+    }
+
+    private record Protocol(@NotNull String className, @Nullable Supplier<Object> context) {
+    }
+}

src/main/java/com/comphenix/protocol/injector/temporary/TemporaryPlayerFactory.java

@@ -19,6 +19,7 @@ package com.comphenix.protocol.injector.temporary;
 
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
+import java.util.UUID;
 
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
@@ -132,7 +133,16 @@ public class TemporaryPlayerFactory {
                 if (methodName.equals("isOnline")) {
                     return injector.isConnected();
                 } else if (methodName.equals("getName")) {
+                    String playerName = injector.getPlayerName();
+                    if (playerName != null) {
+                        return playerName;
+                    }
                     return "UNKNOWN[" + injector.getAddress() + "]";
+                } else if (methodName.equals("getUniqueId")) {
+                    UUID playerUniqueId = injector.getPlayerUniqueId();
+                    if (playerUniqueId != null) {
+                        return playerUniqueId;
+                    }
                 }
 
                 // Ignore all other methods
@@ -184,14 +194,16 @@ public class TemporaryPlayerFactory {
      *   <li>getPlayer()</li>
      *   <li>getAddress()</li>
      *   <li>getServer()</li>
+     *   <li>getName()</li>
+     *   <li>getUniqueId(), when supplied by the login protocol</li>
      *   <li>chat(String)</li>
      *   <li>sendMessage(String)</li>
      *   <li>sendMessage(String[])</li>
      *   <li>kickPlayer(String)</li>
      * </ul>
      * <p>
-     * Note that a temporary player has not yet been assigned a name, and thus cannot be
-     * uniquely identified. Use the address instead.
+     * Before the login start packet is received, the player has no profile information
+     * and can only be identified by its address.
      *
      * @return A temporary player instance.
      */

src/main/java/com/comphenix/protocol/internal/PlatformProvider.java

@@ -0,0 +1,35 @@
+package com.comphenix.protocol.internal;
+
+import java.util.ServiceLoader;
+import java.util.function.Consumer;
+
+import org.bukkit.command.CommandExecutor;
+
+import com.comphenix.protocol.ProtocolLib;
+
+import io.netty.channel.Channel;
+
+public interface PlatformProvider {
+
+    static PlatformProvider get() {
+        return Holder.INSTANCE;
+    }
+
+    boolean hasEarlyChannelInitialization();
+
+    Runnable registerChannelInitializer(Consumer<Channel> channelInitializer);
+
+    void registerCommand(ProtocolLib plugin, String name, CommandExecutor executor);
+
+    final class Holder {
+
+        private static final PlatformProvider INSTANCE = ServiceLoader.load(
+                        PlatformProvider.class,
+                        PlatformProvider.class.getClassLoader())
+                .findFirst()
+                .orElseThrow(() -> new IllegalStateException("No ProtocolLib platform provider is available"));
+
+        private Holder() {
+        }
+    }
+}

src/main/java/com/comphenix/protocol/reflect/StructureModifier.java

@@ -90,6 +90,8 @@ public class StructureModifier<T> {
     protected Map<FieldAccessor, Integer> defaultFields;
     // Cache of previous types
     protected Map<Class<?>, StructureModifier<?>> subtypeCache;
+    // Cache of previous parameterized types
+    private Map<List<Type>, StructureModifier<?>> paramTypeCache = new HashMap<>();
 
     // Whether or subclasses should handle conversion
     protected boolean customConvertHandling;
@@ -201,6 +203,7 @@ public class StructureModifier<T> {
                 other.defaultFields,
                 other.converter,
                 other.subtypeCache);
+        this.paramTypeCache = other.paramTypeCache;
     }
 
     /**
@@ -531,8 +534,18 @@ public class StructureModifier<T> {
             return (StructureModifier<R>) NO_OP_MODIFIER;
         }
 
+        // parameterized lookups must not share a cache entry with the raw field type
+        List<Type> paramTypeKey = null;
+        if (paramTypes.length > 0) {
+            paramTypeKey = new ArrayList<>(paramTypes.length + 1);
+            paramTypeKey.add(fieldType);
+            paramTypeKey.addAll(Arrays.asList(paramTypes));
+        }
+
         // Do we need to update the cache?
-        StructureModifier<R> result = (StructureModifier<R>) this.subtypeCache.get(fieldType);
+        StructureModifier<R> result = (StructureModifier<R>) (paramTypeKey == null
+                ? this.subtypeCache.get(fieldType)
+                : this.paramTypeCache.get(paramTypeKey));
         if (result == null) {
             List<FieldAccessor> fields = new ArrayList<>();
             Map<FieldAccessor, Integer> defaults = new HashMap<>();
@@ -571,7 +584,11 @@ public class StructureModifier<T> {
 
             // Cache structure modifiers
             result = this.withFieldType(fieldType, fields, defaults);
-            this.subtypeCache.put(fieldType, result);
+            if (paramTypeKey == null) {
+                this.subtypeCache.put(fieldType, result);
+            } else {
+                this.paramTypeCache.put(paramTypeKey, result);
+            }
         }
 
         // Add the target too

src/main/java/com/comphenix/protocol/reflect/cloning/ImmutableDetector.java

@@ -63,6 +63,7 @@ public class ImmutableDetector implements Cloner {
         add(MinecraftReflection::getBlockClass);
         add(MinecraftReflection::getItemClass);
         add(MinecraftReflection::getSoundEffectClass);
+        add(MinecraftReflection::getWorldTypeClass);
 
         if (MinecraftVersion.AQUATIC_UPDATE.atOrAbove()) {
             add(MinecraftReflection::getFluidTypeClass);

src/main/java/com/comphenix/protocol/updater/SpigotUpdateRunnable.java

@@ -0,0 +1,58 @@
+/**
+ * ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ * Copyright (C) 2015 dmulloy2
+ * <p>
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ * <p>
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ * <p>
+ * You should have received a copy of the GNU General Public License along with this program;
+ * if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA
+ */
+package com.comphenix.protocol.updater;
+
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.error.Report;
+
+/**
+ * Update check worker (top-level class so the runtime always loads a single {@code .class} entry).
+ */
+final class SpigotUpdateRunnable implements Runnable {
+
+    private final SpigotUpdater updater;
+
+    SpigotUpdateRunnable(SpigotUpdater updater) {
+        this.updater = updater;
+    }
+
+    @Override
+    public void run() {
+        try {
+            String version = this.updater.getSpigotVersion();
+            this.updater.setRemoteVersion(version);
+
+            if (this.updater.versionCheck(version)) {
+                this.updater.result = Updater.UpdateResult.SPIGOT_UPDATE_AVAILABLE;
+            } else {
+                this.updater.result = Updater.UpdateResult.NO_UPDATE;
+            }
+        } catch (Throwable ex) {
+            if (ProtocolLibrary.getConfig().isDebug()) {
+                ProtocolLibrary.getErrorReporter().reportDetailed(
+                        this.updater,
+                        Report.newBuilder(Updater.REPORT_CANNOT_UPDATE_PLUGIN).error(ex).callerParam(this));
+            }
+
+            ProtocolLibrary.disableUpdates();
+        } finally {
+            for (Runnable listener : this.updater.listeners) {
+                ProtocolLibrary.getScheduler().runTask(listener);
+            }
+        }
+    }
+}

src/main/java/com/comphenix/protocol/updater/SpigotUpdater.java

@@ -16,8 +16,6 @@
  */
 package com.comphenix.protocol.updater;
 
-import com.comphenix.protocol.ProtocolLibrary;
-import com.comphenix.protocol.error.Report;
 import com.comphenix.protocol.utility.Closer;
 import org.bukkit.plugin.Plugin;
 
@@ -44,7 +42,7 @@ public final class SpigotUpdater extends Updater {
         waitForThread();
 
         this.type = type;
-        this.thread = new Thread(new SpigotUpdateRunnable());
+        this.thread = new Thread(new SpigotUpdateRunnable(this));
         this.thread.start();
     }
 
@@ -54,36 +52,8 @@ public final class SpigotUpdater extends Updater {
         return String.format(result.toString(), remoteVersion, plugin.getDescription().getVersion(), RESOURCE_URL);
     }
 
-    private class SpigotUpdateRunnable implements Runnable {
-
-        @Override
-        public void run() {
-            try {
-                String version = getSpigotVersion();
-                remoteVersion = version;
-
-                if (versionCheck(version)) {
-                    result = UpdateResult.SPIGOT_UPDATE_AVAILABLE;
-                } else {
-                    result = UpdateResult.NO_UPDATE;
-                }
-            } catch (Throwable ex) {
-                if (ProtocolLibrary.getConfig().isDebug()) {
-                    ProtocolLibrary.getErrorReporter().reportDetailed(
-                            SpigotUpdater.this, Report.newBuilder(REPORT_CANNOT_UPDATE_PLUGIN).error(ex).callerParam(this));
-                } else {
-                    // People don't care
-                    // plugin.getLogger().log(Level.WARNING, "Failed to check for updates: " + ex);
-                }
-
-                ProtocolLibrary.disableUpdates();
-            } finally {
-                // Invoke the listeners on the main thread
-                for (Runnable listener : listeners) {
-                    ProtocolLibrary.getScheduler().runTask(listener);
-                }
-            }
-        }
+    void setRemoteVersion(String remoteVersion) {
+        this.remoteVersion = remoteVersion;
     }
 
     private static final String RESOURCE_URL = "https://www.spigotmc.org/resources/protocollib.1997/";

src/main/java/com/comphenix/protocol/utility/CachedPackage.java

@@ -88,20 +88,23 @@ final class CachedPackage {
      * @throws RuntimeException If we are unable to find the given class.
      */
     public Optional<Class<?>> getPackageClass(String className, String... aliases) {
-        return cache.computeIfAbsent(className, x -> {
-            Optional<Class<?>> clazz = resolveClass(className);
-            if (clazz.isPresent()) {
-                return clazz;
-            }
+        Optional<Class<?>> cached = cache.get(className);
+        if (cached != null) {
+            return cached;
+        }
 
+        Optional<Class<?>> clazz = resolveClass(className);
+        if (!clazz.isPresent()) {
             for (String alias : aliases) {
-                clazz = resolveClass(alias);
-                if (clazz.isPresent()) {
-                    return clazz;
+                Optional<Class<?>> aliasClazz = resolveClass(alias);
+                if (aliasClazz.isPresent()) {
+                    clazz = aliasClazz;
+                    break;
                 }
             }
+        }
 
-            return Optional.empty();
-        });
+        cache.put(className, clazz);
+        return clazz;
     }
 }

src/main/java/com/comphenix/protocol/utility/MinecraftMethods.java

@@ -57,21 +57,25 @@ public final class MinecraftMethods {
     }
     
     public static Function<ByteBuf, Object> getFriendlyBufBufConstructor() {
-    	if (friendlyBufBufConstructor == null) {
-    		Optional<Class<?>> registryByteBuf = MinecraftReflection.getRegistryFriendlyByteBufClass();
-    		
-    		if (registryByteBuf.isPresent()) {
-    			ConstructorAccessor accessor = Accessors.getConstructorAccessor(FuzzyReflection.fromClass(registryByteBuf.get()).getConstructor(FuzzyMethodContract.newBuilder()
-    					.parameterDerivedOf(ByteBuf.class)
-    					.parameterDerivedOf(MinecraftReflection.getRegistryAccessClass())
-    					.build()));
-    			friendlyBufBufConstructor = (byteBuf) -> accessor.invoke(byteBuf, MinecraftRegistryAccess.get());
-    		} else {
-    			ConstructorAccessor accessor = Accessors.getConstructorAccessor(MinecraftReflection.getPacketDataSerializerClass(), ByteBuf.class);
-    			friendlyBufBufConstructor = (byteBuf) -> accessor.invoke(byteBuf);
-    		}
-    	}
-    	return friendlyBufBufConstructor;
+        if (friendlyBufBufConstructor == null) {
+            Optional<Class<?>> registryByteBuf = MinecraftReflection.getRegistryFriendlyByteBufClass();
+
+            if (registryByteBuf.isPresent()) {
+                ConstructorAccessor accessor = Accessors.getConstructorAccessor(
+                        FuzzyReflection.fromClass(registryByteBuf.get()).getConstructor(
+                                FuzzyMethodContract.newBuilder()
+                                        .parameterExactType(ByteBuf.class, 0)
+                                        .parameterExactType(MinecraftReflection.getRegistryAccessClass(), 1)
+                                        .build()));
+                friendlyBufBufConstructor = byteBuf -> accessor.invoke(byteBuf, MinecraftRegistryAccess.get());
+            } else {
+                ConstructorAccessor accessor = Accessors.getConstructorAccessor(
+                        MinecraftReflection.getPacketDataSerializerClass(),
+                        ByteBuf.class);
+                friendlyBufBufConstructor = byteBuf -> accessor.invoke(byteBuf);
+            }
+        }
+        return friendlyBufBufConstructor;
     }
 
     /**

src/main/java/com/comphenix/protocol/utility/MinecraftProtocolVersion.java

@@ -93,6 +93,15 @@ public final class MinecraftProtocolVersion {
         map.put(new MinecraftVersion(1, 20, 5), 766);
 
         map.put(new MinecraftVersion(1, 21, 0), 767);
+        map.put(new MinecraftVersion(1, 21, 2), 768);
+        map.put(new MinecraftVersion(1, 21, 6), 771);
+        map.put(new MinecraftVersion(1, 21, 8), 772);
+        map.put(new MinecraftVersion(1, 21, 9), 773);
+        map.put(new MinecraftVersion(1, 21, 11), 774);
+
+        map.put(new MinecraftVersion(26, 1, 0), 775);
+        map.put(new MinecraftVersion(26, 2, 0), 776);
+        map.put(new MinecraftVersion(26, 3, 0), 777);
         return map;
     }
 

src/main/java/com/comphenix/protocol/utility/MinecraftReflection.java

@@ -553,6 +553,10 @@ public final class MinecraftReflection {
         return getClass("com.mojang.authlib.GameProfile");
     }
 
+    public static Class<?> getGameProfilePropertyMapClass() {
+        return getClass("com.mojang.authlib.properties.PropertyMap");
+    }
+
     /**
      * Retrieve the entity (NMS) class.
      *
@@ -685,7 +689,8 @@ public final class MinecraftReflection {
      * @throws IllegalStateException If the class could not be found or deduced.
      */
     public static Class<?> getChatSerializerClass() {
-        return getMinecraftClass("network.chat.IChatBaseComponent$ChatSerializer", "network.chat.Component$Serializer", "IChatBaseComponent$ChatSerializer");
+        return getMinecraftClass("network.chat.IChatBaseComponent$ChatSerializer",
+                "network.chat.Component$Serializer", "network.chat.ComponentSerialization", "IChatBaseComponent$ChatSerializer");
     }
 
     /**
@@ -916,15 +921,19 @@ public final class MinecraftReflection {
     }
 
     public static Class<?> getMinecraftKeyClass() {
-        return getMinecraftClass("resources.MinecraftKey", "resources.ResourceLocation", "MinecraftKey");
+        return getMinecraftClass("resources.MinecraftKey", "resources.Identifier", "resources.ResourceLocation", "MinecraftKey");
     }
 
     public static Class<?> getMobEffectListClass() {
-        return getMinecraftClass("world.effect.MobEffectList", "MobEffectList", "world.effect.MobEffect");
+        return getMinecraftClass("world.effect.MobEffectList", "MobEffectList", "world.effect.MobEffect", "world.effect.MobEffects");
+    }
+
+    public static Class<?> getDamageTypeClass() {
+        return getMinecraftClass("world.damagesource.DamageType");
     }
 
     public static Class<?> getSoundEffectClass() {
-        return getNullableNMS("sounds.SoundEffect", "sounds.SoundEvent", "SoundEffect");
+        return getNullableNMS("sounds.SoundEffect", "sounds.SoundEvent", "SoundEffect", "sounds.SoundEvents");
     }
 
     /**
@@ -1113,6 +1122,15 @@ public final class MinecraftReflection {
         return getOptionalNMS("network.chat.numbers.StyledFormat");
     }
 
+    /**
+     * Retrieve the NMS TeamColor class, added in 26.2.
+     *
+     * @return The TeamColor class.
+     */
+    public static Optional<Class<?>> getTeamColorClass() {
+        return getOptionalNMS("world.scores.TeamColor");
+    }
+
     /**
      * Retrieve the Gson class used by Minecraft.
      *
@@ -1412,8 +1430,13 @@ public final class MinecraftReflection {
             try {
                 Method asMirrorMethod = getCraftItemStackClass().getMethod("asCraftMirror", getItemStackClass());
                 asCraftMirror = Accessors.getMethodAccessor(asMirrorMethod);
-            } catch (ReflectiveOperationException ex) {
-                throw new RuntimeException("Failed to obtain CraftItemStack.asCraftMirror", ex);
+            } catch (ReflectiveOperationException ex1) {
+                try {
+                    Method asMirrorMethod = getCraftItemStackClass().getMethod("asBukkitMirror", getItemStackClass());
+                    asCraftMirror = Accessors.getMethodAccessor(asMirrorMethod);
+                } catch (ReflectiveOperationException ex2) {
+                    throw new RuntimeException("Failed to obtain CraftItemStack.asCraftMirror", ex2);
+                }
             }
         }
 
@@ -1475,6 +1498,18 @@ public final class MinecraftReflection {
             .orElseThrow(() -> new RuntimeException("Cannot find class " + className));
     }
 
+    /**
+     * Attempt to load a class by its fully-qualified canonical name, without prepending the
+     * Minecraft package. Unlike {@link #getMinecraftClass(String)}, this can resolve names that
+     * already include their package (e.g. {@code net.minecraft.network.protocol.game.XPacket}).
+     *
+     * @param className - the fully-qualified class name.
+     * @return Optional that may contain the class.
+     */
+    public static Optional<Class<?>> getOptionalClass(String className) {
+        return getClassSource().loadClass(className);
+    }
+
     /**
      * Retrieve the class object of a specific CraftBukkit class.
      *
@@ -1679,7 +1714,7 @@ public final class MinecraftReflection {
     }
 
     public static Class<?> getEntityTypes() {
-        return getMinecraftClass("world.entity.EntityTypes", "world.entity.EntityType", "EntityTypes");
+        return getMinecraftClass("world.entity.EntityType", "world.entity.EntityTypes", "EntityTypes");
     }
 
     public static Class<?> getParticleParam() {
@@ -1898,4 +1933,31 @@ public final class MinecraftReflection {
 
         return isMojangMapped;
     }
+
+    /**
+     * Retrieves the PositionMoveRotation class (introduced in 1.21.2).
+     *
+     * @return The PositionMoveRotation class.
+     */
+    public static Class<?> getPositionMoveRotationClass() {
+        return getMinecraftClass("world.entity.PositionMoveRotation");
+    }
+
+    /**
+     * Retrieves the VecDelta class (since 26.3).
+     *
+     * @return The VecDelta class.
+     */
+    public static Optional<Class<?>> getVecDeltaClass() {
+        return getOptionalNMS("network.protocol.game.VecDelta");
+    }
+
+    /**
+     * Retrieves the PositionPath class (since 26.3).
+     *
+     * @return The PositionPath class.
+     */
+    public static Optional<Class<?>> getPositionPathClass() {
+        return getOptionalNMS("world.entity.PositionPath");
+    }
 }

src/main/java/com/comphenix/protocol/utility/MinecraftRegistryAccess.java

@@ -2,6 +2,7 @@ package com.comphenix.protocol.utility;
 
 import java.lang.reflect.Modifier;
 
+import com.comphenix.protocol.wrappers.codecs.WrappedDynamicOps;
 import org.bukkit.Bukkit;
 
 import com.comphenix.protocol.reflect.FuzzyReflection;
@@ -17,6 +18,7 @@ public class MinecraftRegistryAccess {
 
 	private static MethodAccessor GET_SERVER = null;
 	private static MethodAccessor REGISTRY_ACCESS = null;
+	private static MethodAccessor CREATE_SERIALIZATION_CONTEXT = null;
 
 	// lazy initialized
 	private static Object registryAccess = null;
@@ -36,6 +38,14 @@ public class MinecraftRegistryAccess {
 							.banModifier(Modifier.STATIC)
 							.returnDerivedOf(MinecraftReflection.getRegistryAccessClass())
 							.build()));
+
+			CREATE_SERIALIZATION_CONTEXT = Accessors.getMethodAccessor(
+					FuzzyReflection.fromClass(MinecraftReflection.getHolderLookupProviderClass(), false)
+							.getMethod(FuzzyMethodContract.newBuilder()
+									.banModifier(Modifier.STATIC)
+									.returnDerivedOf(MinecraftReflection.getDynamicOpsClass())
+									.parameterDerivedOf(MinecraftReflection.getDynamicOpsClass())
+									.build()));
 		}
 	}
 
@@ -57,4 +67,13 @@ public class MinecraftRegistryAccess {
 
 		return registryAccess;
 	}
+
+	/**
+	 * Returns a RegistryOps using the given DynamicOps as the underlying ops.
+	 *
+	 * @return a RegistryOps
+	 */
+	public static WrappedDynamicOps createSerializationContext(WrappedDynamicOps dynamicOps) {
+		return WrappedDynamicOps.fromHandle(CREATE_SERIALIZATION_CONTEXT.invoke(get(), dynamicOps.getHandle()));
+	}
 }

src/main/java/com/comphenix/protocol/utility/MinecraftVersion.java

@@ -36,6 +36,56 @@ import org.bukkit.Server;
  * @author Kristian
  */
 public final class MinecraftVersion implements Comparable<MinecraftVersion>, Serializable {
+    /**
+     * Version 26.3 - wilderness bound
+     */
+    public static final MinecraftVersion v26_3 = new MinecraftVersion("26.3");
+
+    /**
+     * Version 26.2 - chaos cubed
+     */
+    public static final MinecraftVersion v26_2 = new MinecraftVersion("26.2");
+
+    /**
+     * Version 26.1 - tiny takeover
+     */
+    public static final MinecraftVersion v26_1 = new MinecraftVersion("26.1");
+
+    /**
+     * Version 1.21.11 - mounts of mayhem
+     */
+    public static final MinecraftVersion v1_21_11 = new MinecraftVersion("1.21.11");
+
+    /**
+     * Version 1.21.10 - hotfix for 1.21.9
+     */
+    public static final MinecraftVersion v1_21_10 = new MinecraftVersion("1.21.10");
+
+    /**
+     * Version 1.21.9 - the copper age drop
+     */
+    public static final MinecraftVersion v1_21_9 = new MinecraftVersion("1.21.9");
+
+    /**
+     * Version 1.21.6 - chase the skies
+     */
+    public static final MinecraftVersion v1_21_6 = new MinecraftVersion("1.21.6");
+
+    /**
+     * Version 1.21.5 - spring to life drop
+     */
+    public static final MinecraftVersion v1_21_5 = new MinecraftVersion("1.21.5");
+
+    /**
+     * Version 1.21.4 - the garden awakens drop
+     */
+    public static final MinecraftVersion v1_21_4 = new MinecraftVersion("1.21.4");
+
+    /**
+     * Version 1.21.2 - the bundles of bravery drop
+     */
+    public static final MinecraftVersion v1_21_2 = new MinecraftVersion("1.21.2");
+
     /**
      * Version 1.21.0 - the tricky trials update
      */
@@ -149,7 +199,7 @@ public final class MinecraftVersion implements Comparable<MinecraftVersion>, Ser
     /**
      * The latest release version of minecraft.
      */
-    public static final MinecraftVersion LATEST = v1_21_0;
+    public static final MinecraftVersion LATEST = v26_3;
 
     // used when serializing
     private static final long serialVersionUID = -8695133558996459770L;

src/main/java/com/comphenix/protocol/utility/StreamSerializer.java

@@ -326,15 +326,9 @@ public class StreamSerializer {
 
     public byte[] getBytesAndRelease(ByteBuf buf) {
         try {
-            if (buf.hasArray()) {
-                // heap buffer, we can access the array directly
-                return buf.array();
-            } else {
-                // direct buffer, we need to copy the bytes into an array
-                byte[] bytes = new byte[buf.readableBytes()];
-                buf.readBytes(bytes);
-                return bytes;
-            }
+            byte[] bytes = new byte[buf.readableBytes()];
+            buf.getBytes(buf.readerIndex(), bytes);
+            return bytes;
         } finally {
             ReferenceCountUtil.safeRelease(buf);
         }

src/main/java/com/comphenix/protocol/utility/ZeroBuffer.java

@@ -2,12 +2,14 @@ package com.comphenix.protocol.utility;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufAllocator;
-import io.netty.buffer.ByteBufProcessor;
+import io.netty.util.ByteProcessor;
+
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
+import java.nio.channels.FileChannel;
 import java.nio.channels.GatheringByteChannel;
 import java.nio.channels.ScatteringByteChannel;
 import java.nio.charset.Charset;
@@ -54,6 +56,16 @@ public class ZeroBuffer extends ByteBuf {
         return false;
     }
 
+    @Override
+    public boolean isReadOnly() {
+        return false;
+    }
+
+    @Override
+    public ByteBuf asReadOnly() {
+        return null;
+    }
+
     @Override
     public int readerIndex() {
         return 0;
@@ -179,36 +191,71 @@ public class ZeroBuffer extends ByteBuf {
         return 0;
     }
 
+    @Override
+    public short getShortLE(int i) {
+        return 0;
+    }
+
     @Override
     public int getUnsignedShort(int i) {
         return 0;
     }
 
+    @Override
+    public int getUnsignedShortLE(int i) {
+        return 0;
+    }
+
     @Override
     public int getMedium(int i) {
         return 0;
     }
 
+    @Override
+    public int getMediumLE(int i) {
+        return 0;
+    }
+
     @Override
     public int getUnsignedMedium(int i) {
         return 0;
     }
 
+    @Override
+    public int getUnsignedMediumLE(int i) {
+        return 0;
+    }
+
     @Override
     public int getInt(int i) {
         return 0;
     }
 
+    @Override
+    public int getIntLE(int i) {
+        return 0;
+    }
+
     @Override
     public long getUnsignedInt(int i) {
         return 0;
     }
 
+    @Override
+    public long getUnsignedIntLE(int i) {
+        return 0;
+    }
+
     @Override
     public long getLong(int i) {
         return 0;
     }
 
+    @Override
+    public long getLongLE(int i) {
+        return 0;
+    }
+
     @Override
     public char getChar(int i) {
         return 0;
@@ -264,6 +311,16 @@ public class ZeroBuffer extends ByteBuf {
         return 0;
     }
 
+    @Override
+    public int getBytes(int i, FileChannel fileChannel, long l, int i1) throws IOException {
+        return 0;
+    }
+
+    @Override
+    public CharSequence getCharSequence(int i, int i1, Charset charset) {
+        return "";
+    }
+
     @Override
     public ByteBuf setBoolean(int i, boolean b) {
         return null;
@@ -279,21 +336,41 @@ public class ZeroBuffer extends ByteBuf {
         return null;
     }
 
+    @Override
+    public ByteBuf setShortLE(int i, int i1) {
+        return null;
+    }
+
     @Override
     public ByteBuf setMedium(int i, int i1) {
         return null;
     }
 
+    @Override
+    public ByteBuf setMediumLE(int i, int i1) {
+        return null;
+    }
+
     @Override
     public ByteBuf setInt(int i, int i1) {
         return null;
     }
 
+    @Override
+    public ByteBuf setIntLE(int i, int i1) {
+        return null;
+    }
+
     @Override
     public ByteBuf setLong(int i, long l) {
         return null;
     }
 
+    @Override
+    public ByteBuf setLongLE(int i, long l) {
+        return null;
+    }
+
     @Override
     public ByteBuf setChar(int i, int i1) {
         return null;
@@ -349,11 +426,21 @@ public class ZeroBuffer extends ByteBuf {
         return 0;
     }
 
+    @Override
+    public int setBytes(int i, FileChannel fileChannel, long l, int i1) {
+        return 0;
+    }
+
     @Override
     public ByteBuf setZero(int i, int i1) {
         return null;
     }
 
+    @Override
+    public int setCharSequence(int i, CharSequence charSequence, Charset charset) {
+        return 0;
+    }
+
     @Override
     public boolean readBoolean() {
         return false;
@@ -374,36 +461,71 @@ public class ZeroBuffer extends ByteBuf {
         return 0;
     }
 
+    @Override
+    public short readShortLE() {
+        return 0;
+    }
+
     @Override
     public int readUnsignedShort() {
         return 0;
     }
 
+    @Override
+    public int readUnsignedShortLE() {
+        return 0;
+    }
+
     @Override
     public int readMedium() {
         return 0;
     }
 
+    @Override
+    public int readMediumLE() {
+        return 0;
+    }
+
     @Override
     public int readUnsignedMedium() {
         return 0;
     }
 
+    @Override
+    public int readUnsignedMediumLE() {
+        return 0;
+    }
+
     @Override
     public int readInt() {
         return 0;
     }
 
+    @Override
+    public int readIntLE() {
+        return 0;
+    }
+
     @Override
     public long readUnsignedInt() {
         return 0;
     }
 
+    @Override
+    public long readUnsignedIntLE() {
+        return 0;
+    }
+
     @Override
     public long readLong() {
         return 0;
     }
 
+    @Override
+    public long readLongLE() {
+        return 0;
+    }
+
     @Override
     public char readChar() {
         return 0;
@@ -429,6 +551,11 @@ public class ZeroBuffer extends ByteBuf {
         return null;
     }
 
+    @Override
+    public ByteBuf readRetainedSlice(int i) {
+        return null;
+    }
+
     @Override
     public ByteBuf readBytes(ByteBuf byteBuf) {
         return null;
@@ -469,6 +596,16 @@ public class ZeroBuffer extends ByteBuf {
         return 0;
     }
 
+    @Override
+    public CharSequence readCharSequence(int i, Charset charset) {
+        return "";
+    }
+
+    @Override
+    public int readBytes(FileChannel fileChannel, long l, int i) {
+        return 0;
+    }
+
     @Override
     public ByteBuf skipBytes(int i) {
         return null;
@@ -489,21 +626,41 @@ public class ZeroBuffer extends ByteBuf {
         return null;
     }
 
+    @Override
+    public ByteBuf writeShortLE(int i) {
+        return null;
+    }
+
     @Override
     public ByteBuf writeMedium(int i) {
         return null;
     }
 
+    @Override
+    public ByteBuf writeMediumLE(int i) {
+        return null;
+    }
+
     @Override
     public ByteBuf writeInt(int i) {
         return null;
     }
 
+    @Override
+    public ByteBuf writeIntLE(int i) {
+        return null;
+    }
+
     @Override
     public ByteBuf writeLong(long l) {
         return null;
     }
 
+    @Override
+    public ByteBuf writeLongLE(long l) {
+        return null;
+    }
+
     @Override
     public ByteBuf writeChar(int i) {
         return null;
@@ -559,11 +716,21 @@ public class ZeroBuffer extends ByteBuf {
         return 0;
     }
 
+    @Override
+    public int writeBytes(FileChannel fileChannel, long l, int i) {
+        return 0;
+    }
+
     @Override
     public ByteBuf writeZero(int i) {
         return null;
     }
 
+    @Override
+    public int writeCharSequence(CharSequence charSequence, Charset charset) {
+        return 0;
+    }
+
     @Override
     public int indexOf(int i, int i1, byte b) {
         return 0;
@@ -585,22 +752,22 @@ public class ZeroBuffer extends ByteBuf {
     }
 
     @Override
-    public int forEachByte(ByteBufProcessor byteBufProcessor) {
+    public int forEachByte(ByteProcessor byteProcessor) {
         return 0;
     }
 
     @Override
-    public int forEachByte(int i, int i1, ByteBufProcessor byteBufProcessor) {
+    public int forEachByte(int i, int i1, ByteProcessor byteProcessor) {
         return 0;
     }
 
     @Override
-    public int forEachByteDesc(ByteBufProcessor byteBufProcessor) {
+    public int forEachByteDesc(ByteProcessor byteProcessor) {
         return 0;
     }
 
     @Override
-    public int forEachByteDesc(int i, int i1, ByteBufProcessor byteBufProcessor) {
+    public int forEachByteDesc(int i, int i1, ByteProcessor byteProcessor) {
         return 0;
     }
 
@@ -619,16 +786,31 @@ public class ZeroBuffer extends ByteBuf {
         return null;
     }
 
+    @Override
+    public ByteBuf retainedSlice() {
+        return null;
+    }
+
     @Override
     public ByteBuf slice(int i, int i1) {
         return null;
     }
 
+    @Override
+    public ByteBuf retainedSlice(int i, int i1) {
+        return null;
+    }
+
     @Override
     public ByteBuf duplicate() {
         return null;
     }
 
+    @Override
+    public ByteBuf retainedDuplicate() {
+        return null;
+    }
+
     @Override
     public int nioBufferCount() {
         return 0;
@@ -738,4 +920,14 @@ public class ZeroBuffer extends ByteBuf {
     public ByteBuf retain() {
         return null;
     }
+
+    @Override
+    public ByteBuf touch() {
+        return null;
+    }
+
+    @Override
+    public ByteBuf touch(Object o) {
+        return null;
+    }
 }

src/main/java/com/comphenix/protocol/wrappers/BukkitConverters.java

@@ -70,6 +70,7 @@ import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
 import org.bukkit.Sound;
 import org.bukkit.World;
 import org.bukkit.WorldType;
@@ -873,6 +874,13 @@ public class BukkitConverters {
         return ignoreNull(new EquivalentConverter<EntityType>() {
             @Override
             public Object getGeneric(EntityType specific) {
+                if (MinecraftVersion.v26_2.atOrAbove()) {
+                    // EntityType.byString was removed in 26.2, resolve through the registry instead
+                    WrappedRegistry registry = WrappedRegistry.getRegistry(MinecraftReflection.getEntityTypes());
+                    NamespacedKey key = specific.getKey();
+                    return registry.get(new MinecraftKey(key.getNamespace(), key.getKey()));
+                }
+
                 if (entityTypeFromName == null) {
                     Class<?> entityTypesClass = MinecraftReflection.getEntityTypes();
                     entityTypeFromName = Accessors.getMethodAccessor(
@@ -1428,6 +1436,142 @@ public class BukkitConverters {
         });
     }
 
+    // Lazily-resolved CraftDamageType reflection. volatile + DCL keeps the publish safe
+    // and avoids re-running fuzzy lookups in concurrent injection paths.
+    private static volatile MethodAccessor damageTypeToNms = null;
+    private static volatile MethodAccessor damageTypeFromNms = null;
+    private static volatile MethodAccessor damageTypeHolderValue = null;
+    private static boolean damageTypeToNmsReturnsHolder;
+    private static boolean damageTypeFromNmsAcceptsHolder;
+    private static final Map<Object, Object> damageTypeHolders = new ConcurrentHashMap<>();
+
+    private static FuzzyReflection craftDamageTypeFuzzy() {
+        return FuzzyReflection.fromClass(getCraftBukkitClass("damage.CraftDamageType"), false);
+    }
+
+    private static MethodAccessor resolveDamageTypeToNms() {
+        MethodAccessor accessor = damageTypeToNms;
+        if (accessor != null) return accessor;
+        synchronized (BukkitConverters.class) {
+            accessor = damageTypeToNms;
+            if (accessor != null) return accessor;
+            try {
+                accessor = Accessors.getMethodAccessor(craftDamageTypeFuzzy().getMethod(FuzzyMethodContract.newBuilder()
+                        .parameterExactArray(org.bukkit.damage.DamageType.class)
+                        .returnTypeExact(MinecraftReflection.getDamageTypeClass())
+                        .requireModifier(Modifier.STATIC)
+                        .build()));
+            } catch (IllegalArgumentException exception) {
+                accessor = Accessors.getMethodAccessor(craftDamageTypeFuzzy().getMethod(FuzzyMethodContract.newBuilder()
+                        .parameterExactArray(org.bukkit.damage.DamageType.class)
+                        .returnTypeExact(MinecraftReflection.getHolderClass())
+                        .requireModifier(Modifier.STATIC)
+                        .build()));
+                damageTypeToNmsReturnsHolder = true;
+            }
+            damageTypeToNms = accessor;
+            return accessor;
+        }
+    }
+
+    private static MethodAccessor resolveDamageTypeFromNms() {
+        MethodAccessor accessor = damageTypeFromNms;
+        if (accessor != null) return accessor;
+        synchronized (BukkitConverters.class) {
+            accessor = damageTypeFromNms;
+            if (accessor != null) return accessor;
+            try {
+                accessor = Accessors.getMethodAccessor(craftDamageTypeFuzzy().getMethod(FuzzyMethodContract.newBuilder()
+                        .parameterExactArray(MinecraftReflection.getDamageTypeClass())
+                        .returnTypeExact(org.bukkit.damage.DamageType.class)
+                        .requireModifier(Modifier.STATIC)
+                        .build()));
+            } catch (IllegalArgumentException exception) {
+                accessor = Accessors.getMethodAccessor(craftDamageTypeFuzzy().getMethod(FuzzyMethodContract.newBuilder()
+                        .parameterExactArray(MinecraftReflection.getHolderClass())
+                        .returnTypeExact(org.bukkit.damage.DamageType.class)
+                        .requireModifier(Modifier.STATIC)
+                        .build()));
+                damageTypeFromNmsAcceptsHolder = true;
+            }
+            damageTypeFromNms = accessor;
+            return accessor;
+        }
+    }
+
+    private static Object getHolderValue(Object holder) {
+        MethodAccessor accessor = damageTypeHolderValue;
+        if (accessor == null) {
+            synchronized (BukkitConverters.class) {
+                accessor = damageTypeHolderValue;
+                if (accessor == null) {
+                    accessor = Accessors.getMethodAccessor(
+                            FuzzyReflection.fromClass(MinecraftReflection.getHolderClass(), false)
+                                    .getMethod(FuzzyMethodContract.newBuilder()
+                                            .parameterCount(0)
+                                            .banModifier(Modifier.STATIC)
+                                            .returnTypeExact(Object.class)
+                                            .build()));
+                    damageTypeHolderValue = accessor;
+                }
+            }
+        }
+        return accessor.invoke(holder);
+    }
+
+    private static Object getDamageTypeHolder(Object generic) {
+        Object holder = damageTypeHolders.get(generic);
+        if (holder != null) {
+            return holder;
+        }
+
+        MethodAccessor accessor = resolveDamageTypeToNms();
+        if (!damageTypeToNmsReturnsHolder) {
+            throw new IllegalStateException("CraftDamageType accepts holders but does not produce them");
+        }
+
+        for (org.bukkit.damage.DamageType damageType : org.bukkit.Registry.DAMAGE_TYPE) {
+            Object candidate = accessor.invoke(null, damageType);
+            Object candidateValue = getHolderValue(candidate);
+            damageTypeHolders.putIfAbsent(candidateValue, candidate);
+            if (Objects.equal(candidateValue, generic)) {
+                return candidate;
+            }
+        }
+
+        throw new IllegalArgumentException("Unable to resolve a holder for damage type " + generic);
+    }
+
+    public static EquivalentConverter<org.bukkit.damage.DamageType> getDamageTypeConverter() {
+        return ignoreNull(new EquivalentConverter<org.bukkit.damage.DamageType>() {
+
+            @Override
+            public Class<org.bukkit.damage.DamageType> getSpecificType() {
+                return org.bukkit.damage.DamageType.class;
+            }
+
+            @Override
+            public Object getGeneric(org.bukkit.damage.DamageType specific) {
+                Object generic = resolveDamageTypeToNms().invoke(null, specific);
+                if (damageTypeToNmsReturnsHolder) {
+                    Object value = getHolderValue(generic);
+                    damageTypeHolders.putIfAbsent(value, generic);
+                    return value;
+                }
+                return generic;
+            }
+
+            @Override
+            public org.bukkit.damage.DamageType getSpecific(Object generic) {
+                MethodAccessor accessor = resolveDamageTypeFromNms();
+                if (damageTypeFromNmsAcceptsHolder) {
+                    generic = getDamageTypeHolder(generic);
+                }
+                return (org.bukkit.damage.DamageType) accessor.invoke(null, generic);
+            }
+        });
+    }
+
     private static Class<?> dimensionManager;
     private static FauxEnumConverter<Dimension> dimensionConverter;
     private static FauxEnumConverter<DimensionImpl> dimensionImplConverter;

src/main/java/com/comphenix/protocol/wrappers/CustomPacketPayloadWrapper.java

@@ -18,6 +18,8 @@ import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.Objects;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
 
 import net.bytebuddy.ByteBuddy;
 import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
@@ -33,8 +35,8 @@ import net.bytebuddy.matcher.ElementMatchers;
  * by default. Constructing a new wrapper instance will give out a handle to a completely new implemented type, that
  * allows to set a key and some kind of data of any choice.
  * <p>
- * Note that constructing this class from a generic handle is only possible for the spigot-specific UnknownPayload type.
- * All other payloads should be accessed via a structure modifier directly.
+ * Constructing this class from a generic handle requires either retained raw byte data, such as {@code DiscardedPayload},
+ * or a writable serialization method on the concrete payload type.
  *
  * @author Pasqual Koschmieder
  */
@@ -46,7 +48,16 @@ public final class CustomPacketPayloadWrapper {
     private static final ConstructorAccessor PAYLOAD_WRAPPER_CONSTRUCTOR;
 
     private static final MethodAccessor GET_ID_PAYLOAD_METHOD;
+    private static final MethodAccessor GET_ID_HOLDER_PAYLOAD_METHOD;
+    private static final MethodAccessor GET_ID_PAYLOAD_HOLDER_METHOD;
     private static final MethodAccessor SERIALIZE_PAYLOAD_METHOD;
+    private static final Class<?> PAYLOAD_SERIALIZER_CLASS;
+    private static final ConcurrentHashMap<Class<?>, Optional<MethodAccessor>> SERIALIZE_PAYLOAD_METHODS =
+            new ConcurrentHashMap<>();
+
+    /** True when running on the nested-ID API where DiscardedPayload is used instead of the ByteBuddy proxy. */
+    private static final boolean USE_DISCARDED_PAYLOAD;
+    private static final boolean DISCARDED_PAYLOAD_USES_BYTE_ARRAY;
 
     private static final EquivalentConverter<CustomPacketPayloadWrapper> CONVERTER;
 
@@ -55,22 +66,73 @@ public final class CustomPacketPayloadWrapper {
             MINECRAFT_KEY_CLASS = MinecraftReflection.getMinecraftKeyClass();
             CUSTOM_PACKET_PAYLOAD_CLASS = MinecraftReflection.getMinecraftClass("network.protocol.common.custom.CustomPacketPayload");
 
-            Method getPayloadId = FuzzyReflection.fromClass(CUSTOM_PACKET_PAYLOAD_CLASS).getMethod(FuzzyMethodContract.newBuilder()
-                    .banModifier(Modifier.STATIC)
-                    .returnTypeExact(MINECRAFT_KEY_CLASS)
-                    .parameterCount(0)
-                    .build());
-            GET_ID_PAYLOAD_METHOD = Accessors.getMethodAccessor(getPayloadId);
+            Method getPayloadId = null;
+            Method getPayloadIdHolder = null;
+            Method getPayloadIdFromHolder = null;
+            boolean useDiscardedPayload = false;
+            try {
+                getPayloadId = FuzzyReflection.fromClass(CUSTOM_PACKET_PAYLOAD_CLASS).getMethod(FuzzyMethodContract.newBuilder()
+                        .banModifier(Modifier.STATIC)
+                        .returnTypeExact(MINECRAFT_KEY_CLASS)
+                        .parameterCount(0)
+                        .build());
+            } catch (IllegalArgumentException ignored) {
+                // Paper 26: the payload exposes its identifier through one intermediate record.
+                Method[] accessors = findChainedIdAccessors(CUSTOM_PACKET_PAYLOAD_CLASS, MINECRAFT_KEY_CLASS);
+                getPayloadIdHolder = accessors[0];
+                getPayloadIdFromHolder = accessors[1];
+                useDiscardedPayload = true;
+            }
+            GET_ID_PAYLOAD_METHOD = getPayloadId != null ? Accessors.getMethodAccessor(getPayloadId) : null;
+            GET_ID_HOLDER_PAYLOAD_METHOD = getPayloadIdHolder != null
+                    ? Accessors.getMethodAccessor(getPayloadIdHolder) : null;
+            GET_ID_PAYLOAD_HOLDER_METHOD = getPayloadIdFromHolder != null
+                    ? Accessors.getMethodAccessor(getPayloadIdFromHolder) : null;
+            USE_DISCARDED_PAYLOAD = useDiscardedPayload;
 
-            Method serializePayloadData = FuzzyReflection.fromClass(CUSTOM_PACKET_PAYLOAD_CLASS).getMethod(FuzzyMethodContract.newBuilder()
-                    .banModifier(Modifier.STATIC)
-                    .returnTypeVoid()
-                    .parameterCount(1)
-                    .parameterDerivedOf(ByteBuf.class, 0)
-                    .build());
-            SERIALIZE_PAYLOAD_METHOD = Accessors.getMethodAccessor(serializePayloadData);
+            Method serializePayloadData = null;
+            try {
+                serializePayloadData = FuzzyReflection.fromClass(CUSTOM_PACKET_PAYLOAD_CLASS).getMethod(FuzzyMethodContract.newBuilder()
+                        .banModifier(Modifier.STATIC)
+                        .returnTypeVoid()
+                        .parameterCount(1)
+                        .parameterDerivedOf(ByteBuf.class, 0)
+                        .build());
+            } catch (IllegalArgumentException ignored) {
+                // Paper 26 declares the write method on each concrete payload instead.
+            }
+            SERIALIZE_PAYLOAD_METHOD = serializePayloadData != null
+                    ? Accessors.getMethodAccessor(serializePayloadData) : null;
+            if (serializePayloadData == null) {
+                ByteBuf buffer = Unpooled.buffer();
+                try {
+                    PAYLOAD_SERIALIZER_CLASS = MinecraftReflection.getPacketDataSerializer(buffer).getClass();
+                } finally {
+                    if (buffer.refCnt() > 0) {
+                        buffer.release();
+                    }
+                }
+            } else {
+                PAYLOAD_SERIALIZER_CLASS = null;
+            }
 
-            Constructor<?> payloadWrapperConstructor = makePayloadWrapper();
+            Constructor<?> payloadWrapperConstructor;
+            boolean discardedPayloadUsesByteArray = false;
+            if (useDiscardedPayload) {
+                Class<?> discardedPayloadClass = MinecraftReflection.getMinecraftClass(
+                        "network.protocol.common.custom.DiscardedPayload");
+                try {
+                    payloadWrapperConstructor = discardedPayloadClass.getConstructor(
+                            MINECRAFT_KEY_CLASS, byte[].class);
+                    discardedPayloadUsesByteArray = true;
+                } catch (NoSuchMethodException exception) {
+                    payloadWrapperConstructor = discardedPayloadClass.getConstructor(
+                            MINECRAFT_KEY_CLASS, ByteBuf.class);
+                }
+            } else {
+                payloadWrapperConstructor = makePayloadWrapper();
+            }
+            DISCARDED_PAYLOAD_USES_BYTE_ARRAY = discardedPayloadUsesByteArray;
             PAYLOAD_WRAPPER_CONSTRUCTOR = Accessors.getConstructorAccessor(payloadWrapperConstructor);
 
             CONVERTER = new EquivalentConverter<CustomPacketPayloadWrapper>() {
@@ -94,6 +156,41 @@ public final class CustomPacketPayloadWrapper {
         }
     }
 
+    private static Method[] findChainedIdAccessors(Class<?> payloadClass, Class<?> keyClass) {
+        Method payloadAccessor = null;
+        Method keyAccessor = null;
+        FuzzyMethodContract keyAccessorContract = FuzzyMethodContract.newBuilder()
+                .banModifier(Modifier.STATIC)
+                .returnTypeExact(keyClass)
+                .parameterCount(0)
+                .build();
+
+        for (Method candidate : payloadClass.getMethods()) {
+            if (Modifier.isStatic(candidate.getModifiers()) || candidate.getParameterCount() != 0) {
+                continue;
+            }
+
+            Method candidateKeyAccessor;
+            try {
+                candidateKeyAccessor = FuzzyReflection.fromClass(candidate.getReturnType(), true)
+                        .getMethod(keyAccessorContract);
+            } catch (IllegalArgumentException ignored) {
+                continue;
+            }
+
+            if (payloadAccessor != null) {
+                throw new IllegalArgumentException("Multiple CustomPacketPayload identifier accessors found");
+            }
+            payloadAccessor = candidate;
+            keyAccessor = candidateKeyAccessor;
+        }
+
+        if (payloadAccessor == null) {
+            throw new IllegalArgumentException("Unable to find a CustomPacketPayload identifier accessor");
+        }
+        return new Method[]{payloadAccessor, keyAccessor};
+    }
+
     private static Constructor<?> makePayloadWrapper() throws Exception {
         return new ByteBuddy()
                 .subclass(Object.class)
@@ -116,6 +213,64 @@ public final class CustomPacketPayloadWrapper {
                 .getConstructor(MinecraftReflection.getMinecraftKeyClass(), byte[].class);
     }
 
+    private static Optional<MethodAccessor> findSerializePayloadMethod(Class<?> payloadClass) {
+        Method serializeMethod = null;
+        for (Method candidate : FuzzyReflection.fromClass(payloadClass, true).getMethods()) {
+            if (Modifier.isStatic(candidate.getModifiers())
+                    || candidate.getReturnType() != void.class
+                    || candidate.getParameterCount() != 1) {
+                continue;
+            }
+
+            Class<?> parameterClass = candidate.getParameterTypes()[0];
+            if (parameterClass == Object.class || !parameterClass.isAssignableFrom(PAYLOAD_SERIALIZER_CLASS)) {
+                continue;
+            }
+            if (serializeMethod != null) {
+                throw new IllegalArgumentException("Multiple CustomPacketPayload serialization methods found on "
+                        + payloadClass.getName());
+            }
+            serializeMethod = candidate;
+        }
+
+        if (serializeMethod == null) {
+            return Optional.empty();
+        }
+        serializeMethod.setAccessible(true);
+        return Optional.of(Accessors.getMethodAccessor(serializeMethod));
+    }
+
+    private static MethodAccessor getSerializePayloadMethod(Object payload) {
+        if (SERIALIZE_PAYLOAD_METHOD != null) {
+            return SERIALIZE_PAYLOAD_METHOD;
+        }
+        return SERIALIZE_PAYLOAD_METHODS
+                .computeIfAbsent(payload.getClass(), CustomPacketPayloadWrapper::findSerializePayloadMethod)
+                .orElse(null);
+    }
+
+    private static byte[] serializePayload(Object payload) {
+        MethodAccessor serializeMethod = getSerializePayloadMethod(payload);
+        if (serializeMethod == null) {
+            throw new UnsupportedOperationException(
+                    "Cannot extract raw custom payload bytes from " + payload.getClass().getName()
+                            + ": payload has no byte array, ByteBuf, or serialization method");
+        }
+
+        ByteBuf buffer = Unpooled.buffer();
+        try {
+            Object serializer = MinecraftReflection.getPacketDataSerializer(buffer);
+            serializeMethod.invoke(payload, serializer);
+            byte[] result = new byte[buffer.readableBytes()];
+            buffer.getBytes(buffer.readerIndex(), result);
+            return result;
+        } finally {
+            if (buffer.refCnt() > 0) {
+                buffer.release();
+            }
+        }
+    }
+
     // ====== api methods ======
 
     /**
@@ -171,29 +326,39 @@ public final class CustomPacketPayloadWrapper {
      * @return a wrapper holding the minecraft key and payload of the given custom payload instance.
      */
     public static CustomPacketPayloadWrapper fromUnknownPayload(Object payload) {
-        Object messageId = GET_ID_PAYLOAD_METHOD.invoke(payload);
-        MinecraftKey id = MinecraftKey.getConverter().getSpecific(messageId);
+        MinecraftKey id = getPayloadId(payload);
 
         // we read and retain the underlying buffer in case the class uses a buffer to store the data
         // this way, when passing the packet to further handling, the buffer is not released and can be re-used
         StructureModifier<Object> modifier = new StructureModifier<>(payload.getClass()).withTarget(payload);
-        byte[] messagePayload = modifier.withType(ByteBuf.class).optionRead(0)
-                .map(buffer -> {
-                    ByteBuf buf = (ByteBuf) buffer;
-                    byte[] data = StreamSerializer.getDefault().getBytesAndRelease(buf.markReaderIndex().retain());
-                    buf.resetReaderIndex();
-                    return data;
-                })
-                .orElseGet(() -> {
-                    ByteBuf buffer = Unpooled.buffer();
-                    Object serializer = MinecraftReflection.getPacketDataSerializer(buffer);
-                    SERIALIZE_PAYLOAD_METHOD.invoke(payload, serializer);
-                    return StreamSerializer.getDefault().getBytesAndRelease(buffer);
-                });
+        byte[] messagePayload = (byte[]) modifier.withType(byte[].class).readSafely(0);
+        if (messagePayload != null) {
+            messagePayload = messagePayload.clone();
+        } else {
+            messagePayload = modifier.withType(ByteBuf.class).optionRead(0)
+                    .map(buffer -> {
+                        ByteBuf buf = (ByteBuf) buffer;
+                        byte[] data = StreamSerializer.getDefault().getBytesAndRelease(buf.markReaderIndex().retain());
+                        buf.resetReaderIndex();
+                        return data;
+                    })
+                    .orElseGet(() -> serializePayload(payload));
+        }
 
         return new CustomPacketPayloadWrapper(messagePayload, id);
     }
 
+    private static MinecraftKey getPayloadId(Object payload) {
+        Object messageId;
+        if (GET_ID_PAYLOAD_METHOD != null) {
+            messageId = GET_ID_PAYLOAD_METHOD.invoke(payload);
+        } else {
+            Object idHolder = GET_ID_HOLDER_PAYLOAD_METHOD.invoke(payload);
+            messageId = GET_ID_PAYLOAD_HOLDER_METHOD.invoke(idHolder);
+        }
+        return MinecraftKey.getConverter().getSpecific(messageId);
+    }
+
     /**
      * Get the generic id of the wrapped message id.
      *
@@ -230,6 +395,13 @@ public final class CustomPacketPayloadWrapper {
      * @return a new payload wrapper instance using the provided message id and payload.
      */
     public Object newHandle() {
+        if (USE_DISCARDED_PAYLOAD) {
+            if (DISCARDED_PAYLOAD_USES_BYTE_ARRAY) {
+                return PAYLOAD_WRAPPER_CONSTRUCTOR.invoke(this.getGenericId(), this.payload);
+            }
+            ByteBuf buf = Unpooled.copiedBuffer(this.payload);
+            return PAYLOAD_WRAPPER_CONSTRUCTOR.invoke(this.getGenericId(), buf);
+        }
         return PAYLOAD_WRAPPER_CONSTRUCTOR.invoke(this.getGenericId(), this.payload);
     }
 

src/main/java/com/comphenix/protocol/wrappers/EnumWrappers.java

@@ -36,6 +36,12 @@ public abstract class EnumWrappers {
     public enum ClientCommand {
         PERFORM_RESPAWN,
         REQUEST_STATS,
+        REQUEST_GAMERULE_VALUES,
+
+        /**
+         * @deprecated Removed in 26.1
+         */
+        @Deprecated
         OPEN_INVENTORY_ACHIEVEMENT
     }
 
@@ -140,6 +146,8 @@ public abstract class EnumWrappers {
         UPDATE_LISTED,
         UPDATE_LATENCY,
         UPDATE_DISPLAY_NAME,
+        UPDATE_LIST_ORDER,
+        UPDATE_HAT,
         /**
          * @deprecated Removed in 1.19.3
          */
@@ -178,7 +186,9 @@ public abstract class EnumWrappers {
         DROP_ALL_ITEMS,
         DROP_ITEM,
         RELEASE_USE_ITEM,
-        SWAP_HELD_ITEMS("SWAP_ITEM_WITH_OFFHAND");
+        SWAP_HELD_ITEMS("SWAP_ITEM_WITH_OFFHAND"),
+        STAB,
+        CHANGE_DESTROY_DIRECTION;
 
         final String[] aliases;
         PlayerDigType(String... aliases) {
@@ -191,8 +201,18 @@ public abstract class EnumWrappers {
     }
 
     public enum PlayerAction implements AliasedEnum {
+        /**
+         * @deprecated Removed in 1.21.6
+         */
+        @Deprecated
         START_SNEAKING("PRESS_SHIFT_KEY"),
+
+        /**
+         * @deprecated Removed in 1.21.6
+         */
+        @Deprecated
         STOP_SNEAKING("RELEASE_SHIFT_KEY"),
+
         STOP_SLEEPING,
         START_SPRINTING,
         STOP_SPRINTING,
@@ -332,7 +352,8 @@ public abstract class EnumWrappers {
         NEUTRAL("neutral"),
         PLAYERS("player"),
         AMBIENT("ambient"),
-        VOICE("voice");
+        VOICE("voice"),
+        UI("ui");
 
         private static final Map<String, SoundCategory> LOOKUP;
         static {
@@ -364,7 +385,8 @@ public abstract class EnumWrappers {
         LEGS,
         CHEST,
         HEAD,
-        BODY
+        BODY,
+        SADDLE
     }
 
     public enum Hand {
@@ -638,6 +660,71 @@ public abstract class EnumWrappers {
         TRANSFER;
     }
 
+    public enum TeamCollisionRule {
+
+        ALWAYS("always"),
+        NEVER("never"),
+        PUSH_OTHER_TEAMS("pushOtherTeams"),
+        PUSH_OWN_TEAM("pushOwnTeam");
+
+        public static TeamCollisionRule fromName(String name) {
+            for (TeamCollisionRule value : values()) {
+                if (value.name.equals(name)) {
+                    return value;
+                }
+            }
+            throw new IllegalArgumentException("Unknown team collision rule: " + name);
+        }
+
+        private final String name;
+
+        TeamCollisionRule(String name) {
+            this.name = name;
+        }
+
+        @Override
+        public String toString() {
+            return name;
+        }
+    }
+
+    public enum TeamVisibility {
+
+        ALWAYS("always"),
+        NEVER("never"),
+        HIDE_FOR_OTHER_TEAMS("hideForOtherTeams"),
+        HIDE_FOR_OWN_TEAM("hideForOwnTeam");
+
+        public static TeamVisibility fromName(String name) {
+            for (TeamVisibility value : values()) {
+                if (value.name.equals(name)) {
+                    return value;
+                }
+            }
+            throw new IllegalArgumentException("Unknown team visibility: " + name);
+        }
+
+        private final String name;
+
+        TeamVisibility(String name) {
+            this.name = name;
+        }
+
+        @Override
+        public String toString() {
+            return name;
+        }
+    }
+
+    public enum HeightmapType {
+        WORLD_SURFACE_WG,
+        WORLD_SURFACE,
+        OCEAN_FLOOR_WG,
+        OCEAN_FLOOR,
+        MOTION_BLOCKING,
+        MOTION_BLOCKING_NO_LEAVES,
+    }
+
     private static Class<?> PROTOCOL_CLASS = null;
     private static Class<?> CLIENT_COMMAND_CLASS = null;
     private static Class<?> CHAT_VISIBILITY_CLASS = null;
@@ -663,6 +750,9 @@ public abstract class EnumWrappers {
     private static Class<?> RENDER_TYPE_CLASS = null;
     private static Class<?> CHAT_FORMATTING_CLASS = null;
     private static Class<?> CLIENT_INTENT_CLASS = null;
+    private static Class<?> TEAM_COLLISION_RULE_CLASS = null;
+    private static Class<?> TEAM_VISIBILITY_CLASS = null;
+    private static Class<?> HEIGHTMAP_TYPE_CLASS = null;
 
     private static boolean INITIALIZING = false;
     private static boolean INITIALIZED = false;
@@ -714,7 +804,10 @@ public abstract class EnumWrappers {
             PLAYER_DIG_TYPE_CLASS = getEnum(PacketType.Play.Client.BLOCK_DIG.getPacketClass(), 1);
             PLAYER_ACTION_CLASS = getEnum(PacketType.Play.Client.ENTITY_ACTION.getPacketClass(), 0);
             SCOREBOARD_ACTION_CLASS = getEnum(PacketType.Play.Server.SCOREBOARD_SCORE.getPacketClass(), 0);
-            PARTICLE_CLASS = getEnum(PacketType.Play.Server.WORLD_PARTICLES.getPacketClass(), 0);
+            // the particle enum was removed in 1.13, later packets may contain unrelated enums
+            if (!MinecraftVersion.AQUATIC_UPDATE.atOrAbove()) {
+                PARTICLE_CLASS = getEnum(PacketType.Play.Server.WORLD_PARTICLES.getPacketClass(), 0);
+            }
 
             PLAYER_INFO_ACTION_CLASS = getEnum(PacketType.Play.Server.PLAYER_INFO.getPacketClass(), 0);
             if (PLAYER_INFO_ACTION_CLASS == null) {
@@ -723,7 +816,7 @@ public abstract class EnumWrappers {
             }
 
             try {
-                SOUND_CATEGORY_CLASS = MinecraftReflection.getMinecraftClass("sounds.SoundCategory");
+                SOUND_CATEGORY_CLASS = MinecraftReflection.getMinecraftClass("sounds.SoundCategory", "sounds.SoundSource");
             } catch (Exception ex) {
                 SOUND_CATEGORY_CLASS = getEnum(PacketType.Play.Server.NAMED_SOUND_EFFECT.getPacketClass(), 0);
             }
@@ -739,13 +832,17 @@ public abstract class EnumWrappers {
             if (MinecraftVersion.CAVES_CLIFFS_1.atOrAbove()) {
                 HAND_CLASS = MinecraftReflection.getMinecraftClass("world.EnumHand", "world.InteractionHand");
 
-                FuzzyReflection fuzzy = FuzzyReflection.fromClass(MinecraftReflection.getEnumEntityUseActionClass(), true);
-                Method getType = fuzzy.getMethod(FuzzyMethodContract.newBuilder()
-                    .parameterCount(0)
-                    .returnTypeMatches(FuzzyMatchers.except(Void.class))
-                    .build());
+                if (MinecraftVersion.v26_1.atOrAbove()) {
+                    // TODO
+                } else {
+                    FuzzyReflection fuzzy = FuzzyReflection.fromClass(MinecraftReflection.getEnumEntityUseActionClass(), true);
+                    Method getType = fuzzy.getMethod(FuzzyMethodContract.newBuilder()
+                            .parameterCount(0)
+                            .returnTypeMatches(FuzzyMatchers.except(Void.class))
+                            .build());
 
-                ENTITY_USE_ACTION_CLASS = getType.getReturnType();
+                    ENTITY_USE_ACTION_CLASS = getType.getReturnType();
+                }
             } else {
                 HAND_CLASS = getEnum(PacketType.Play.Client.USE_ENTITY.getPacketClass(), 1);
                 ENTITY_USE_ACTION_CLASS = getEnum(PacketType.Play.Client.USE_ENTITY.getPacketClass(), 0);
@@ -770,6 +867,17 @@ public abstract class EnumWrappers {
 
             CLIENT_INTENT_CLASS = getEnum(PacketType.Handshake.Client.SET_PROTOCOL.getPacketClass(), 0);
 
+            TEAM_COLLISION_RULE_CLASS = MinecraftReflection.getNullableNMS(
+                    "world.scores.ScoreboardTeamBase$EnumTeamPush" /* Spigot Mapping */,
+                    "world.scores.Team$CollisionRule" /* Mojang Mapping */);
+            TEAM_VISIBILITY_CLASS = MinecraftReflection.getNullableNMS(
+                    "world.scores.ScoreboardTeamBase$EnumNameTagVisibility" /* Spigot Mapping */,
+                    "world.scores.Team$Visibility" /* Mojang Mapping */);
+
+            HEIGHTMAP_TYPE_CLASS = MinecraftReflection.getNullableNMS(
+                    "world.level.levelgen.HeightMap$Type" /* Spigot Mapping */,
+                    "world.level.levelgen.Heightmap$Types" /* Mojang Mapping */);
+
             associate(PROTOCOL_CLASS, Protocol.class, getProtocolConverter());
             associate(CLIENT_COMMAND_CLASS, ClientCommand.class, getClientCommandConverter());
             associate(CHAT_VISIBILITY_CLASS, ChatVisibility.class, getChatVisibilityConverter());
@@ -794,6 +902,9 @@ public abstract class EnumWrappers {
             associate(RENDER_TYPE_CLASS, RenderType.class, getRenderTypeConverter());
             associate(CHAT_FORMATTING_CLASS, ChatFormatting.class, getChatFormattingConverter());
             associate(CLIENT_INTENT_CLASS, ClientIntent.class, getClientIntentConverter());
+            associate(TEAM_COLLISION_RULE_CLASS, TeamCollisionRule.class, getTeamCollisionRuleConverter());
+            associate(TEAM_VISIBILITY_CLASS, TeamVisibility.class, getTeamVisibilityConverter());
+            associate(HEIGHTMAP_TYPE_CLASS, HeightmapType.class, getHeightmapTypeConverter());
 
             if (ENTITY_POSE_CLASS != null) {
                 associate(ENTITY_POSE_CLASS, EntityPose.class, getEntityPoseConverter());
@@ -968,6 +1079,21 @@ public abstract class EnumWrappers {
         return CLIENT_INTENT_CLASS;
     }
 
+    public static Class<?> getTeamCollisionRuleClass() {
+        initialize();
+        return TEAM_COLLISION_RULE_CLASS;
+    }
+
+    public static Class<?> getTeamVisibilityClass() {
+        initialize();
+        return TEAM_VISIBILITY_CLASS;
+    }
+
+    public static Class<?> getHeightmapTypeClass() {
+        initialize();
+        return HEIGHTMAP_TYPE_CLASS;
+    }
+
     // Get the converters
     public static EquivalentConverter<Protocol> getProtocolConverter() {
         return new EnumConverter<>(getProtocolClass(), Protocol.class);
@@ -1065,6 +1191,18 @@ public abstract class EnumWrappers {
         return new EnumConverter<>(getClientIntentClass(), ClientIntent.class);
     }
 
+    public static EquivalentConverter<TeamCollisionRule> getTeamCollisionRuleConverter() {
+        return new EnumConverter<>(getTeamCollisionRuleClass(), TeamCollisionRule.class);
+    }
+
+    public static EquivalentConverter<TeamVisibility> getTeamVisibilityConverter() {
+        return new EnumConverter<>(getTeamVisibilityClass(), TeamVisibility.class);
+    }
+
+    public static EquivalentConverter<HeightmapType> getHeightmapTypeConverter() {
+        return new EnumConverter<>(getHeightmapTypeClass(), HeightmapType.class);
+    }
+
     /**
      * @since 1.13+
      * @return {@link EnumConverter} or null (if bellow 1.13 / nms EnumPose class cannot be found)

src/main/java/com/comphenix/protocol/wrappers/LegacyDataWatcher.java

@@ -105,17 +105,22 @@ public class LegacyDataWatcher extends AbstractWrapper implements IDataWatcher {
      */
     @Deprecated
     public LegacyDataWatcher(List<WrappedWatchableObject> objects) {
-        this(newHandle(fakeEntity(), objects));
+        this(newHandle(fakeEntity()));
+
+        for (WrappedWatchableObject object : objects) {
+            WrappedDataWatcherObject watcherObject = MinecraftReflection.watcherObjectExists()
+                    ? object.getWatcherObject()
+                    : WrappedDataWatcherObject.fromIndex(object.getIndex());
+            setObject(watcherObject, object, false);
+        }
     }
 
-    private static Object newHandle(Object entity, List<WrappedWatchableObject> objects) {
+    private static Object newHandle(Object entity) {
         if (constructor == null) {
-            constructor = Accessors.getConstructorAccessor(HANDLE_TYPE, MinecraftReflection.getEntityClass(),
-                MinecraftReflection.getArrayClass(MinecraftReflection.getDataWatcherItemClass()));
+            constructor = Accessors.getConstructorAccessor(HANDLE_TYPE, MinecraftReflection.getEntityClass());
         }
 
-        Object[] genericItems = new Object[0];// (Object[]) ITEMS_CONVERTER.getGeneric(objects);
-        return constructor.invoke(entity, genericItems);
+        return constructor.invoke(entity);
     }
 
     private static Object fakeEntity() {

src/main/java/com/comphenix/protocol/wrappers/MutablePropertyMap.java

@@ -0,0 +1,29 @@
+package com.comphenix.protocol.wrappers;
+
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.ImmutableMultimap;
+import com.google.common.collect.Multimap;
+import com.mojang.authlib.properties.Property;
+import com.mojang.authlib.properties.PropertyMap;
+
+/**
+ * Mutable version of PropertyMap
+ * Credit to PaperMC: https://github.com/PaperMC/Paper/blob/main/paper-server/src/main/java/io/papermc/paper/profile/MutablePropertyMap.java
+ */
+public class MutablePropertyMap extends PropertyMap {
+    private final Multimap<String, Property> properties = HashMultimap.create();
+
+    public MutablePropertyMap() {
+        super(ImmutableMultimap.of());
+    }
+
+    public MutablePropertyMap(final Multimap<String, Property> properties) {
+        this();
+        this.putAll(properties);
+    }
+
+    @Override
+    protected Multimap<String, Property> delegate() {
+        return this.properties;
+    }
+}

src/main/java/com/comphenix/protocol/wrappers/PlayerInfoData.java

@@ -16,12 +16,12 @@
  */
 package com.comphenix.protocol.wrappers;
 
-import com.comphenix.protocol.wrappers.WrappedProfilePublicKey.WrappedProfileKeyData;
 import java.lang.reflect.Constructor;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 import java.util.UUID;
+import javax.annotation.Nullable;
 
 import com.comphenix.protocol.PacketType;
 import com.comphenix.protocol.reflect.EquivalentConverter;
@@ -29,8 +29,7 @@ import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.utility.MinecraftVersion;
 import com.comphenix.protocol.wrappers.EnumWrappers.NativeGameMode;
-
-import javax.annotation.Nullable;
+import com.comphenix.protocol.wrappers.WrappedProfilePublicKey.WrappedProfileKeyData;
 
 /**
  * Represents an immutable PlayerInfoData in the PLAYER_INFO packet.
@@ -41,7 +40,9 @@ public class PlayerInfoData {
 
     private final UUID profileId;
     private final int latency;
+    private final int listOrder;
     private final boolean listed;
+    private final boolean showHat;
     private final NativeGameMode gameMode;
     private final WrappedGameProfile profile;
     private final WrappedChatComponent displayName;
@@ -74,6 +75,21 @@ public class PlayerInfoData {
         this(profileId, latency, listed, gameMode, profile, displayName, (WrappedRemoteChatSessionData) null);
     }
 
+    /**
+     * Constructs a new PlayerInfoData for Minecraft 1.19.3 or later.
+     *
+     * @param profileId the id of the profile (has to be non-null)
+     * @param latency the latency in milliseconds
+     * @param listed whether the player is listed in the tab list
+     * @param gameMode the game mode
+     * @param profile the game profile
+     * @param displayName display name in tab list (optional)
+     * @param remoteChatSession the remote chat session for this profile or null
+     */
+    public PlayerInfoData(UUID profileId, int latency, boolean listed, NativeGameMode gameMode, WrappedGameProfile profile, WrappedChatComponent displayName, @Nullable WrappedRemoteChatSessionData remoteChatSession) {
+        this(profileId, latency, listed, gameMode, profile, displayName, false, remoteChatSession);
+    }
+
     /**
      * Constructs a new PlayerInfoData for Minecraft 1.19. This is incompatible on 1.19.3.
      * @see PlayerInfoData#PlayerInfoData(UUID, int, boolean, NativeGameMode, WrappedGameProfile, WrappedChatComponent, WrappedRemoteChatSessionData)
@@ -96,10 +112,12 @@ public class PlayerInfoData {
         this.displayName = displayName;
         this.profileKeyData = profileKeyData;
         this.remoteChatSessionData = null;
+        this.showHat = false;
+        this.listOrder = 0;
     }
 
     /**
-     * Constructs a new PlayerInfoData for Minecraft 1.19.3 or later.
+     * Constructs a new PlayerInfoData for Minecraft 1.21.2 or later.
      *
      * @param profileId the id of the profile (has to be non-null)
      * @param latency the latency in milliseconds
@@ -107,9 +125,43 @@ public class PlayerInfoData {
      * @param gameMode the game mode
      * @param profile the game profile
      * @param displayName display name in tab list (optional)
+     * @param listOrder the priority of this entry in the tab list
      * @param remoteChatSession the remote chat session for this profile or null
      */
-    public PlayerInfoData(UUID profileId, int latency, boolean listed, NativeGameMode gameMode, WrappedGameProfile profile, WrappedChatComponent displayName, @Nullable WrappedRemoteChatSessionData remoteChatSession) {
+    public PlayerInfoData(UUID profileId, int latency, boolean listed, NativeGameMode gameMode, WrappedGameProfile profile, WrappedChatComponent displayName, int listOrder, @Nullable WrappedRemoteChatSessionData remoteChatSession) {
+        this(profileId, latency, listed, gameMode, profile, displayName, false, listOrder, remoteChatSession);
+    }
+
+    /**
+     * Constructs a new PlayerInfoData for Minecraft 1.21.4 or later.
+     *
+     * @param profileId the id of the profile (has to be non-null)
+     * @param latency the latency in milliseconds
+     * @param listed whether the player is listed in the tab list
+     * @param gameMode the game mode
+     * @param profile the game profile
+     * @param displayName display name in tab list (optional)
+     * @param showHat whether a hat should be shown
+     * @param remoteChatSession the remote chat session for this profile or null
+     */
+    public PlayerInfoData(UUID profileId, int latency, boolean listed, NativeGameMode gameMode, WrappedGameProfile profile, WrappedChatComponent displayName, boolean showHat, @Nullable WrappedRemoteChatSessionData remoteChatSession) {
+        this(profileId, latency, listed, gameMode, profile, displayName, showHat, 0, remoteChatSession);
+    }
+
+    /**
+     * Constructs a new PlayerInfoData for Minecraft 1.21.4 or later.
+     *
+     * @param profileId the id of the profile (has to be non-null)
+     * @param latency the latency in milliseconds
+     * @param listed whether the player is listed in the tab list
+     * @param gameMode the game mode
+     * @param profile the game profile
+     * @param displayName display name in tab list (optional)
+     * @param showHat whether a hat should be shown
+     * @param listOrder the priority of this entry in the tab list
+     * @param remoteChatSession the remote chat session for this profile or null
+     */
+    public PlayerInfoData(UUID profileId, int latency, boolean listed, NativeGameMode gameMode, WrappedGameProfile profile, WrappedChatComponent displayName, boolean showHat, int listOrder, @Nullable WrappedRemoteChatSessionData remoteChatSession) {
         this.profileId = profileId;
         this.latency = latency;
         this.listed = listed;
@@ -118,6 +170,8 @@ public class PlayerInfoData {
         this.displayName = displayName;
         this.profileKeyData = null;
         this.remoteChatSessionData = remoteChatSession;
+        this.showHat = showHat;
+        this.listOrder = listOrder;
     }
 
     /**
@@ -179,6 +233,22 @@ public class PlayerInfoData {
         return displayName;
     }
 
+    /**
+     * Gets if a hat is shown (since 1.21.4)
+     * @return if the hat is shown
+     */
+    public boolean isShowHat() {
+        return showHat;
+    }
+
+    /**
+     * Gets the priority of this entry in the tab list (since 1.21.2)
+     * @return the priority of this entry in the tab list
+     */
+    public int getListOrder() {
+        return listOrder;
+    }
+
     /**
      * Returns the public key of the profile (since 1.19). Returns the public key of the remote chat session since 1.19.3
      * @return The public key of the profile.
@@ -202,7 +272,9 @@ public class PlayerInfoData {
      * @return A new converter.
      */
     public static EquivalentConverter<PlayerInfoData> getConverter() {
-        return new EquivalentConverter<PlayerInfoData>() {
+        return new EquivalentConverter<>() {
+            private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
+
             @Override
             public Object getGeneric(PlayerInfoData specific) {
                 if (constructor == null) {
@@ -225,13 +297,20 @@ public class PlayerInfoData {
                         args.add(EnumWrappers.getGameModeClass());
                         args.add(MinecraftReflection.getIChatBaseComponentClass());
 
+                        if (MinecraftVersion.v1_21_4.atOrAbove()) {
+                            args.add(boolean.class);
+                        }
+                        if (MinecraftVersion.v1_21_2.atOrAbove()) {
+                            args.add(int.class);
+                        }
+
                         if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
                             args.add(MinecraftReflection.getRemoteChatSessionDataClass());
                         } else if (MinecraftVersion.WILD_UPDATE.atOrAbove()) {
                             args.add(MinecraftReflection.getProfilePublicKeyDataClass());
                         }
 
-                        constructor = MinecraftReflection.getPlayerInfoDataClass().getConstructor(args.toArray(new Class<?>[0]));
+                        constructor = MinecraftReflection.getPlayerInfoDataClass().getConstructor(args.toArray(EMPTY_CLASS_ARRAY));
                     } catch (Exception e) {
                         throw new RuntimeException("Cannot find PlayerInfoData constructor.", e);
                     }
@@ -240,32 +319,72 @@ public class PlayerInfoData {
                 // Attempt to construct the underlying PlayerInfoData
 
                 try {
-                    Object gameMode = EnumWrappers.getGameModeConverter().getGeneric(specific.gameMode);
+                    Object gameMode = Converters.ignoreNull(EnumWrappers.getGameModeConverter()).getGeneric(specific.gameMode);
                     Object displayName = specific.displayName != null ? specific.displayName.handle : null;
-
                     Object profile = specific.profile != null ? specific.profile.handle : null;
-                    if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
-                        return constructor.newInstance(
-                                specific.profileId,
-                                profile,
-                                specific.listed,
-                                specific.latency,
-                                gameMode,
-                                displayName,
-                                specific.remoteChatSessionData != null ? BukkitConverters.getWrappedRemoteChatSessionDataConverter().getGeneric(specific.remoteChatSessionData) : null
-                        );
+                    Object remoteChatSessionData = specific.remoteChatSessionData != null ? BukkitConverters.getWrappedRemoteChatSessionDataConverter().getGeneric(specific.remoteChatSessionData) : null;
+
+                    Object[] args;
+
+                    if (MinecraftVersion.v1_21_4.atOrAbove()) {
+                        args = new Object[] {
+                            specific.profileId,
+                            profile,
+                            specific.listed,
+                            specific.latency,
+                            gameMode,
+                            displayName,
+                            specific.showHat,
+                            specific.listOrder,
+                            remoteChatSessionData
+                        };
+                    } else if (MinecraftVersion.v1_21_2.atOrAbove()) {
+                        args = new Object[] {
+                            specific.profileId,
+                            profile,
+                            specific.listed,
+                            specific.latency,
+                            gameMode,
+                            displayName,
+                            specific.listOrder,
+                            remoteChatSessionData
+                        };
+                    } else if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
+                        args = new Object[] {
+                            specific.profileId,
+                            profile,
+                            specific.listed,
+                            specific.latency,
+                            gameMode,
+                            displayName,
+                            remoteChatSessionData
+                        };
                     } else if (MinecraftVersion.WILD_UPDATE.atOrAbove()) {
-                        return constructor.newInstance(
-                                profile,
-                                specific.latency,
-                                gameMode,
-                                displayName,
-                                specific.profileKeyData == null ? null : specific.profileKeyData.handle);
+                        args = new Object[] {
+                            profile,
+                            specific.latency,
+                            gameMode,
+                            displayName,
+                            specific.profileKeyData == null ? null : specific.profileKeyData.handle
+                        };
                     } else if (MinecraftVersion.CAVES_CLIFFS_1.atOrAbove()) {
-                        return constructor.newInstance(profile, specific.latency, gameMode, displayName);
+                        args = new Object[] {
+                            profile,
+                            specific.latency,
+                            gameMode,
+                            displayName
+                        };
                     } else {
-                        return constructor.newInstance(null, profile, specific.latency, gameMode, displayName);
+                        args = new Object[] {
+                            null,
+                            profile,
+                            specific.latency,
+                            gameMode,
+                            displayName
+                        };
                     }
+
+                    return constructor.newInstance(args);
                 } catch (Exception e) {
                     throw new RuntimeException("Failed to construct PlayerInfoData.", e);
                 }
@@ -275,37 +394,60 @@ public class PlayerInfoData {
             public PlayerInfoData getSpecific(Object generic) {
                 if (MinecraftReflection.isPlayerInfoData(generic)) {
                     StructureModifier<Object> modifier = new StructureModifier<>(generic.getClass(), null, false)
-                            .withTarget(generic);
+                        .withTarget(generic);
 
                     StructureModifier<WrappedGameProfile> gameProfiles = modifier.withType(
-                            MinecraftReflection.getGameProfileClass(), BukkitConverters.getWrappedGameProfileConverter());
+                        MinecraftReflection.getGameProfileClass(), BukkitConverters.getWrappedGameProfileConverter());
                     WrappedGameProfile gameProfile = gameProfiles.read(0);
 
                     StructureModifier<Integer> ints = modifier.withType(int.class);
                     int latency = ints.read(0);
 
                     StructureModifier<NativeGameMode> gameModes = modifier.withType(
-                            EnumWrappers.getGameModeClass(), EnumWrappers.getGameModeConverter());
+                        EnumWrappers.getGameModeClass(), Converters.ignoreNull(EnumWrappers.getGameModeConverter()));
                     NativeGameMode gameMode = gameModes.read(0);
 
                     StructureModifier<WrappedChatComponent> displayNames = modifier.withType(
-                            MinecraftReflection.getIChatBaseComponentClass(), BukkitConverters.getWrappedChatComponentConverter());
+                        MinecraftReflection.getIChatBaseComponentClass(), BukkitConverters.getWrappedChatComponentConverter());
                     WrappedChatComponent displayName = displayNames.read(0);
 
-                    if(MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
+                    if (MinecraftVersion.v1_21_4.atOrAbove()) {
                         return new PlayerInfoData(modifier.<UUID>withType(UUID.class).read(0),
-                                latency,
-                                modifier.<Boolean>withType(boolean.class).read(0),
-                                gameMode,
-                                gameProfile,
-                                displayName,
-                                modifier.withType(MinecraftReflection.getRemoteChatSessionDataClass(), BukkitConverters.getWrappedRemoteChatSessionDataConverter()).read(0)
-                                );
+                            latency,
+                            modifier.<Boolean>withType(boolean.class).read(0),
+                            gameMode,
+                            gameProfile,
+                            displayName,
+                            modifier.<Boolean>withType(boolean.class).read(1),
+                            ints.read(1),
+                            modifier.withType(MinecraftReflection.getRemoteChatSessionDataClass(), BukkitConverters.getWrappedRemoteChatSessionDataConverter()).read(0)
+                        );
+                    }
+                    if (MinecraftVersion.v1_21_2.atOrAbove()) {
+                        return new PlayerInfoData(modifier.<UUID>withType(UUID.class).read(0),
+                            latency,
+                            modifier.<Boolean>withType(boolean.class).read(0),
+                            gameMode,
+                            gameProfile,
+                            displayName,
+                            ints.read(1),
+                            modifier.withType(MinecraftReflection.getRemoteChatSessionDataClass(), BukkitConverters.getWrappedRemoteChatSessionDataConverter()).read(0)
+                        );
+                    }
+                    if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
+                        return new PlayerInfoData(modifier.<UUID>withType(UUID.class).read(0),
+                            latency,
+                            modifier.<Boolean>withType(boolean.class).read(0),
+                            gameMode,
+                            gameProfile,
+                            displayName,
+                            modifier.withType(MinecraftReflection.getRemoteChatSessionDataClass(), BukkitConverters.getWrappedRemoteChatSessionDataConverter()).read(0)
+                        );
                     }
                     WrappedProfileKeyData key = null;
                     if (MinecraftVersion.WILD_UPDATE.atOrAbove()) {
                         StructureModifier<WrappedProfileKeyData> keyData = modifier.withType(
-                                MinecraftReflection.getProfilePublicKeyDataClass(), BukkitConverters.getWrappedPublicKeyDataConverter());
+                            MinecraftReflection.getProfilePublicKeyDataClass(), BukkitConverters.getWrappedPublicKeyDataConverter());
                         key = keyData.read(0);
                     }
 

src/main/java/com/comphenix/protocol/wrappers/WrappedBlockData.java

@@ -45,7 +45,7 @@ public abstract class WrappedBlockData extends AbstractWrapper implements Clonab
         private static MethodAccessor TO_LEGACY_DATA;
         private static MethodAccessor GET_BLOCK;
         private static MethodAccessor BLOCK_FROM_MATERIAL;
-        private static MethodAccessor GET_BLOCK_DATA;
+        private static MethodAccessor DEFAULT_BLOCK_DATA;
         private static MethodAccessor FROM_LEGACY_DATA;
         private static MethodAccessor GET_HANDLE;
 
@@ -100,7 +100,7 @@ public abstract class WrappedBlockData extends AbstractWrapper implements Clonab
                         .parameterCount(0)
                         .returnTypeExact(IBLOCK_DATA)
                         .build();
-                GET_BLOCK_DATA = Accessors.getMethodAccessor(fuzzy.getMethod(contract));
+                DEFAULT_BLOCK_DATA = Accessors.getMethodAccessor(fuzzy.getMethod(contract));
 
                 fuzzy = FuzzyReflection.fromClass(MinecraftReflection.getCraftBukkitClass("block.data.CraftBlockData"));
                 contract = FuzzyMethodContract
@@ -131,7 +131,7 @@ public abstract class WrappedBlockData extends AbstractWrapper implements Clonab
         @Override
         public void setType(Material material) {
             Object block = BLOCK_FROM_MATERIAL.invoke(null, material);
-            setHandle(GET_BLOCK_DATA.invoke(block));
+            setHandle(DEFAULT_BLOCK_DATA.invoke(block));
         }
 
         @Override
@@ -141,7 +141,7 @@ public abstract class WrappedBlockData extends AbstractWrapper implements Clonab
 
         @Override
         public void setTypeAndData(Material material, int data) {
-            setHandle(TO_LEGACY_DATA.invoke(null, material, (byte) data));
+            setHandle(FROM_LEGACY_DATA.invoke(null, material, (byte) data));
         }
 
         @Override
@@ -151,7 +151,7 @@ public abstract class WrappedBlockData extends AbstractWrapper implements Clonab
 
         private static WrappedBlockData createNewData(Material material) {
             Object block = BLOCK_FROM_MATERIAL.invoke(null, material);
-            return new NewBlockData(GET_BLOCK_DATA.invoke(block));
+            return new NewBlockData(DEFAULT_BLOCK_DATA.invoke(block));
         }
 
         private static WrappedBlockData createNewData(Material material, int data) {

src/main/java/com/comphenix/protocol/wrappers/WrappedChatComponent.java

@@ -1,8 +1,13 @@
 package com.comphenix.protocol.wrappers;
 
 import java.io.StringReader;
+import java.lang.reflect.Field;
 import java.util.Optional;
 
+import com.comphenix.protocol.wrappers.codecs.WrappedCodec;
+import com.comphenix.protocol.wrappers.codecs.WrappedDynamicOps;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonParser;
 import org.bukkit.ChatColor;
 
 import com.comphenix.protocol.reflect.FuzzyReflection;
@@ -35,41 +40,51 @@ public class WrappedChatComponent extends AbstractWrapper implements ClonableWra
 
     private static ConstructorAccessor CONSTRUCT_TEXT_COMPONENT = null;
 
-    static {
-        FuzzyReflection reflection = FuzzyReflection.fromClass(SERIALIZER, true);
+    private static WrappedCodec CODEC;
+    private static WrappedDynamicOps REGISTRY_JSON_OPS;
 
-        // Retrieve the correct methods
-        if (MinecraftVersion.v1_20_5.atOrAbove()) {
-            SERIALIZE_COMPONENT = Accessors.getMethodAccessor(reflection.getMethod(FuzzyMethodContract.newBuilder()
+    static {
+        FuzzyReflection fuzzy = FuzzyReflection.fromClass(SERIALIZER, true);
+
+        if (MinecraftVersion.v1_21_6.atOrAbove()) {
+            Field codecField = fuzzy.getFieldByType("CODEC", MinecraftReflection.getCodecClass());
+            CODEC = WrappedCodec.fromHandle(Accessors.getFieldAccessor(codecField).get(null));
+            REGISTRY_JSON_OPS = MinecraftRegistryAccess.createSerializationContext(WrappedDynamicOps.json(false));
+        } else if (MinecraftVersion.v1_20_5.atOrAbove()) {
+            SERIALIZE_COMPONENT = Accessors.getMethodAccessor(fuzzy.getMethod(FuzzyMethodContract.newBuilder()
         			.returnTypeExact(String.class)
         			.parameterDerivedOf(COMPONENT)
         			.parameterDerivedOf(MinecraftReflection.getHolderLookupProviderClass())
         			.build()));
         } else {
-            SERIALIZE_COMPONENT = Accessors.getMethodAccessor(reflection.getMethodByReturnTypeAndParameters("serialize", /* a */
+            SERIALIZE_COMPONENT = Accessors.getMethodAccessor(fuzzy.getMethodByReturnTypeAndParameters("serialize", /* a */
                     String.class, new Class<?>[] { COMPONENT }));
         }
 
-        GSON = Accessors.getFieldAccessor(reflection.getFieldByType("gson", GSON_CLASS)).get(null);
+        if (!MinecraftVersion.v1_20_4.atOrAbove()) {
+            GSON = Accessors.getFieldAccessor(fuzzy.getFieldByType("gson", GSON_CLASS)).get(null);
+        }
 
-        if (MinecraftVersion.v1_20_5.atOrAbove()) {
-			DESERIALIZE = Accessors.getMethodAccessor(reflection.getMethod(FuzzyMethodContract.newBuilder()
-        			.returnDerivedOf(COMPONENT)
-        			.parameterExactType(String.class)
-        			.parameterDerivedOf(MinecraftReflection.getHolderLookupProviderClass())
-        			.build()));
-        } else if (MinecraftVersion.v1_20_4.atOrAbove()) {
-			DESERIALIZE = Accessors.getMethodAccessor(reflection
-					.getMethodByReturnTypeAndParameters("fromJson", MUTABLE_COMPONENT_CLASS.get(), new Class[] { String.class }));
-		} else {
-			try {
-				DESERIALIZE = Accessors.getMethodAccessor(FuzzyReflection.fromClass(MinecraftReflection.getChatDeserializer(), true)
-					.getMethodByReturnTypeAndParameters("deserialize", Object.class, new Class<?>[] { GSON_CLASS, String.class, Class.class, boolean.class }));
-			} catch (IllegalArgumentException ex) {
-				// We'll handle it in the ComponentParser
-				DESERIALIZE = null;
-			}
-		}
+        if (!MinecraftVersion.v1_21_6.atOrAbove()) {
+            if (MinecraftVersion.v1_20_5.atOrAbove()) {
+                DESERIALIZE = Accessors.getMethodAccessor(fuzzy.getMethod(FuzzyMethodContract.newBuilder()
+                        .returnDerivedOf(COMPONENT)
+                        .parameterExactType(String.class)
+                        .parameterDerivedOf(MinecraftReflection.getHolderLookupProviderClass())
+                        .build()));
+            } else if (MinecraftVersion.v1_20_4.atOrAbove()) {
+                DESERIALIZE = Accessors.getMethodAccessor(fuzzy
+                        .getMethodByReturnTypeAndParameters("fromJson", MUTABLE_COMPONENT_CLASS.get(), new Class[]{String.class}));
+            } else {
+                try {
+                    DESERIALIZE = Accessors.getMethodAccessor(FuzzyReflection.fromClass(MinecraftReflection.getChatDeserializer(), true)
+                            .getMethodByReturnTypeAndParameters("deserialize", Object.class, new Class<?>[]{GSON_CLASS, String.class, Class.class, boolean.class}));
+                } catch (IllegalArgumentException ex) {
+                    // We'll handle it in the ComponentParser
+                    DESERIALIZE = null;
+                }
+            }
+        }
 
         // Get a component from a standard Minecraft message
         CONSTRUCT_COMPONENT = Accessors.getMethodAccessor(MinecraftReflection.getCraftChatMessage(), "fromString", String.class, boolean.class);
@@ -83,6 +98,11 @@ public class WrappedChatComponent extends AbstractWrapper implements ClonableWra
     }
 
     private static Object serialize(Object handle) {
+        if (CODEC != null) {
+            Object jobj = CODEC.encode(handle, REGISTRY_JSON_OPS).getOrThrow(JsonParseException::new);
+            return jobj.toString();
+        }
+
     	if (MinecraftVersion.v1_20_5.atOrAbove()) {
     		return SERIALIZE_COMPONENT.invoke(null, handle, MinecraftRegistryAccess.get());
     	}
@@ -91,6 +111,10 @@ public class WrappedChatComponent extends AbstractWrapper implements ClonableWra
     }
 
     private static Object deserialize(String json) {
+        if (CODEC != null) {
+            return CODEC.parse(JsonParser.parseString(json), REGISTRY_JSON_OPS).getOrThrow(JsonParseException::new);
+        }
+
     	if (MinecraftVersion.v1_20_5.atOrAbove()) {
     		return DESERIALIZE.invoke(null, json, MinecraftRegistryAccess.get());
     	}

src/main/java/com/comphenix/protocol/wrappers/WrappedDataWatcher.java

@@ -24,6 +24,7 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
@@ -40,7 +41,6 @@ import com.comphenix.protocol.wrappers.EnumWrappers.EntityPose;
 import com.comphenix.protocol.wrappers.nbt.NbtCompound;
 
 import com.google.common.collect.ImmutableBiMap;
-import com.google.common.collect.ImmutableMap;
 import org.apache.commons.lang.Validate;
 import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
@@ -66,7 +66,7 @@ public class WrappedDataWatcher implements IDataWatcher {
      * Constructs a new DataWatcher wrapper around a NMS handle. The resulting
      * DataWatcher will likely have existing values that can be removed with
      * {@link #clear()}.
-     * 
+     *
      * @param handle DataWatcher handle
      */
     public WrappedDataWatcher(Object handle) {
@@ -90,7 +90,7 @@ public class WrappedDataWatcher implements IDataWatcher {
      * Constructs a new DataWatcher using a real entity. The resulting
      * DataWatcher will not have any keys or values and new ones will have to
      * be added using watcher objects.
-     * 
+     *
      * @param entity The entity
      */
     public WrappedDataWatcher(Entity entity) {
@@ -102,7 +102,7 @@ public class WrappedDataWatcher implements IDataWatcher {
     /**
      * Constructs a new DataWatcher using a fake egg entity and a given
      * list of watchable objects.
-     * 
+     *
      * @param objects The list of objects
      */
     public WrappedDataWatcher(List<WrappedWatchableObject> objects) {
@@ -152,7 +152,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Gets the item at a given index.
-     * 
+     *
      * @param index Index to get
      * @return The watchable object, or null if none exists
      */
@@ -170,7 +170,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Removes the item at a given index.
-     * 
+     *
      * @param index Index to remove
      * @return The previous value, or null if none existed
      */
@@ -180,7 +180,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Whether or not this DataWatcher has an object at a given index.
-     * 
+     *
      * @param index Index to check for
      * @return True if it does, false if not
      */
@@ -209,7 +209,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Get a watched byte.
-     * 
+     *
      * @param index - index of the watched byte.
      * @return The watched byte, or NULL if this value doesn't exist.
      */
@@ -225,7 +225,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Get a watched short.
-     * 
+     *
      * @param index - index of the watched short.
      * @return The watched short, or NULL if this value doesn't exist.
      */
@@ -237,7 +237,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Get a watched integer.
-     * 
+     *
      * @param index - index of the watched integer.
      * @return The watched integer, or NULL if this value doesn't exist.
      */
@@ -263,7 +263,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Get a watched float.
-     * 
+     *
      * @param index - index of the watched float.
      * @return The watched float, or NULL if this value doesn't exist.
      */
@@ -279,7 +279,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Get a watched string.
-     * 
+     *
      * @param index - index of the watched string.
      * @return The watched string, or NULL if this value doesn't exist.
      */
@@ -315,7 +315,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Get a watched string.
-     * 
+     *
      * @param index - index of the watched string.
      * @return The watched string, or NULL if this value doesn't exist.
      */
@@ -477,7 +477,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Retrieve a watchable object by index.
-     * 
+     *
      * @param index Index of the object to retrieve.
      * @return The watched object or null if it doesn't exist.
      */
@@ -487,7 +487,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Retrieve a watchable object by watcher object.
-     * 
+     *
      * @param object The watcher object
      * @return The watched object or null if it doesn't exist.
      */
@@ -500,11 +500,11 @@ public class WrappedDataWatcher implements IDataWatcher {
     /**
      * Sets the DataWatcher Item at a given index to a new value. In 1.9 and up,
      * you cannot register objects without a watcher object.
-     * 
+     *
      * @param index Index of the object to set
      * @param value New value
      * @param update Whether or not to inform the client
-     * 
+     *
      * @see WrappedDataWatcher#setObject(WrappedDataWatcherObject, Object, boolean)
      * @throws IllegalArgumentException in 1.9 and up if there isn't already an
      *      object at this index
@@ -526,12 +526,12 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Sets the DataWatcher Item at a given index to a new value.
-     * 
+     *
      * @param index Index of the object to set
      * @param serializer Serializer from {@link Registry#get(Class)}
      * @param value New value
      * @param update Whether or not to inform the client
-     * 
+     *
      * @see WrappedDataWatcher#setObject(WrappedDataWatcherObject, Object)
      */
     public void setObject(int index, Serializer serializer, Object value, boolean update) {
@@ -547,11 +547,11 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Sets the DataWatcher Item at a given index to a new value.
-     * 
+     *
      * @param index Index of the object to set
      * @param value New value
      * @param update Whether or not to inform the client
-     * 
+     *
      * @see WrappedDataWatcher#setObject(int, Object, boolean)
      */
     public void setObject(int index, WrappedWatchableObject value, boolean update) {
@@ -567,11 +567,11 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Sets the DataWatcher Item associated with a given watcher object to a new value.
-     * 
+     *
      * @param object Associated watcher object
      * @param value Wrapped value
      * @param update Whether or not to inform the client
-     * 
+     *
      * @see #setObject(WrappedDataWatcherObject, Object)
      */
     public void setObject(WrappedDataWatcherObject object, WrappedWatchableObject value, boolean update) {
@@ -589,10 +589,10 @@ public class WrappedDataWatcher implements IDataWatcher {
      * Sets the DataWatcher Item associated with a given watcher object to a
      * new value. If there is not already an object at this index, the
      * specified watcher object must have a serializer.
-     * 
+     *
      * @param object Associated watcher object
      * @param value New value
-     * 
+     *
      * @throws IllegalArgumentException If the watcher object is null or must
      *          have a serializer and does not have one.
      */
@@ -611,7 +611,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Clone the content of the current DataWatcher.
-     * 
+     *
      * @return A cloned data watcher.
      */
     public WrappedDataWatcher deepClone() {
@@ -628,7 +628,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
     /**
      * Retrieve the data watcher associated with an entity.
-     * 
+     *
      * @param entity - the entity to read from.
      * @return Associated data watcher.
      */
@@ -682,7 +682,7 @@ public class WrappedDataWatcher implements IDataWatcher {
     /**
      * Retrieves the type ID associated with a given class. No longer supported
      * in 1.9 and up due to the removal of type IDs.
-     * 
+     *
      * @param clazz Class to find ID for
      * @return The ID, or null if not found
      */
@@ -693,7 +693,7 @@ public class WrappedDataWatcher implements IDataWatcher {
     /**
      * Retrieves the class associated with a given type ID. No longer
      * supported in 1.9 and up due to the removal of type IDs.
-     * 
+     *
      * @param typeID ID to find Class for
      * @return The Class, or null if not found
      */
@@ -729,7 +729,7 @@ public class WrappedDataWatcher implements IDataWatcher {
     /**
      * Represents a DataWatcherObject in 1.9. In order to register an object,
      * the serializer must be specified.
-     * 
+     *
      * @author dmulloy2
      */
     public static class WrappedDataWatcherObject {
@@ -745,7 +745,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
         /**
          * Creates a new watcher object from a NMS handle.
-         * 
+         *
          * @param handle The handle
          */
         public WrappedDataWatcherObject(Object handle) {
@@ -755,7 +755,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
         /**
          * Creates a new watcher object from an index and serializer.
-         * 
+         *
          * @param index Index
          * @param serializer Serializer, see {@link Registry}
          */
@@ -795,7 +795,7 @@ public class WrappedDataWatcher implements IDataWatcher {
 
         /**
          * Gets this watcher object's index.
-         * 
+         *
          * @return The index
          */
         public int getIndex() {
@@ -805,7 +805,7 @@ public class WrappedDataWatcher implements IDataWatcher {
         /**
          * Gets this watcher object's serializer. Will return null if the
          * serializer was never specified.
-         * 
+         *
          * @return The serializer, or null
          */
         public Serializer getSerializer() {
@@ -911,23 +911,36 @@ public class WrappedDataWatcher implements IDataWatcher {
     /**
      * Represents a DataWatcherSerializer in 1.9. If a Serializer is optional,
      * values must be wrapped in a {@link Optional}.
-     * 
+     *
      * @author dmulloy2
      */
     public static class Serializer extends AbstractWrapper {
         private static final Class<?> HANDLE_TYPE = MinecraftReflection.getDataWatcherSerializerClass();
 
-        private final Class<?> type;
+        private final Type type;
         private final boolean optional;
 
         /**
          * Constructs a new Serializer
-         * 
+         *
+         * @param type Type it serializes
+         * @param handle NMS handle
+         * @param optional Whether or not it's {@link Optional}
+         * @deprecated Use {@link Serializer#Serializer(Type, Object, boolean)} instead.
+         */
+        @Deprecated(forRemoval = true)
+        public Serializer(Class<?> type, Object handle, boolean optional) {
+            this((Type) type, handle, optional);
+        }
+
+        /**
+         * Constructs a new Serializer
+         *
          * @param type Type it serializes
          * @param handle NMS handle
          * @param optional Whether or not it's {@link Optional}
          */
-        public Serializer(Class<?> type, Object handle, boolean optional) {
+        public Serializer(Type type, Object handle, boolean optional) {
             super(HANDLE_TYPE);
             this.type = type;
             this.optional = optional;
@@ -937,17 +950,32 @@ public class WrappedDataWatcher implements IDataWatcher {
 
         /**
          * Gets the type this serializer serializes.
-         * 
+         *
          * @return The type
+         * @deprecated use {@link #getGenericType()} instead.
          */
+        @Deprecated(forRemoval = true)
         public Class<?> getType() {
-            return type;
+            if (this.type instanceof Class<?> c) {
+                return c;
+            }
+
+            throw new IllegalStateException("Serializer does not serialize a class");
+        }
+
+        /**
+         * Gets the type this serializer serializes.
+         *
+         * @return The type.
+         */
+        public Type getGenericType() {
+            return this.type;
         }
 
         /**
          * Whether or not this serializer is optional, that is whether or not
          * the return type is wrapped in a {@link Optional}.
-         * 
+         *
          * @return True if it is, false if not
          */
         public boolean isOptional() {
@@ -986,11 +1014,19 @@ public class WrappedDataWatcher implements IDataWatcher {
     public static class Registry {
         private static boolean INITIALIZED = false;
 
-        private static Map<Class<?>, Serializer> RAW_REGISTRY = null;
-        private static Map<Class<?>, Serializer> OPTIONAL_REGISTRY = null;
+        private static Map<Type, Serializer> RAW_REGISTRY = null;
+        private static Map<Type, Serializer> OPTIONAL_REGISTRY = null;
 
         /**
-         * Gets the first serializer associated with a given class.
+         * @deprecated use {@link #get(Type)} instead.
+         */
+        @Deprecated(forRemoval = true)
+        public static Serializer get(Class<?> clazz) {
+            return get((Type) clazz);
+        }
+
+        /**
+         * Gets the first serializer associated with a given type.
          *
          * <p><b>Note</b>: If {@link Serializer#isOptional() the serializer is optional},
          *   values <i>must</i> be wrapped in an {@link Optional}.</p>
@@ -998,39 +1034,46 @@ public class WrappedDataWatcher implements IDataWatcher {
          * <p>If there are multiple serializers for a given class (i.e. BlockPosition),
          *   you should use {@link #get(Class, boolean)} for more precision.</p>
          *
-         * @param clazz Class to find serializer for
+         * @param type Type to find serializer for
          * @return The serializer, or null if none exists
          */
-        public static Serializer get(Class<?> clazz) {
-            Validate.notNull(clazz,"Class cannot be null!");
+        public static Serializer get(Type type) {
+            Validate.notNull(type,"Type cannot be null!");
             initialize();
 
-            Serializer serializer = RAW_REGISTRY.getOrDefault(clazz,
-                OPTIONAL_REGISTRY.getOrDefault(clazz, null));
+            Serializer serializer = RAW_REGISTRY.getOrDefault(type, OPTIONAL_REGISTRY.get(type));
             if (serializer == null) {
-                throw new IllegalArgumentException("No serializer found for " + clazz);
+                throw new IllegalArgumentException("No serializer found for " + type);
             }
 
             return serializer;
         }
 
         /**
-         * Gets the first serializer associated with a given class and optional state.
+         * @deprecated use {@link #get(Type, boolean)} instead.
+         */
+        @Deprecated(forRemoval = true)
+        public static Serializer get(Class<?> clazz, boolean optional) {
+            return get((Type) clazz, optional);
+        }
+
+        /**
+         * Gets the first serializer associated with a given type and optional state.
          * <br/>
          * <b>Note</b>: If the serializer is optional, values <i>must</i> be
          * wrapped in an {@link Optional}
          *
-         * @param clazz Class to find serializer for
+         * @param type Type to find serializer for
          * @param optional Optional state
          * @return The serializer, or null if none exists
          */
-        public static Serializer get(Class<?> clazz, boolean optional) {
-            Validate.notNull(clazz, "Class cannot be null!");
+        public static Serializer get(Type type, boolean optional) {
+            Validate.notNull(type, "Type cannot be null!");
             initialize();
 
-            Serializer serializer = optional ? OPTIONAL_REGISTRY.get(clazz) : RAW_REGISTRY.get(clazz);
+            Serializer serializer = optional ? OPTIONAL_REGISTRY.get(type) : RAW_REGISTRY.get(type);
             if (serializer == null) {
-                throw new IllegalArgumentException("No serializer found for " + (optional ? "Optional<" + clazz + ">" : clazz));
+                throw new IllegalArgumentException("No serializer found for " + (optional ? "Optional<" + type + ">" : type));
             }
 
             return serializer;
@@ -1067,52 +1110,41 @@ public class WrappedDataWatcher implements IDataWatcher {
                 return;
             }
 
-            Map<Class<?>, Serializer> rawRegistry = new HashMap<>();
-            Map<Class<?>, Serializer> optionalRegistry = new HashMap<>();
+            Map<Type, Serializer> rawRegistry = new HashMap<>();
+            Map<Type, Serializer> optionalRegistry = new HashMap<>();
 
             List<Field> candidates = FuzzyReflection.fromClass(MinecraftReflection.getDataWatcherRegistryClass(), true)
                     .getFieldListByType(MinecraftReflection.getDataWatcherSerializerClass());
             for (Field candidate : candidates) {
-                Type generic = candidate.getGenericType();
-                if (generic instanceof ParameterizedType) {
-                    ParameterizedType type = (ParameterizedType) generic;
-                    Type[] args = type.getActualTypeArguments();
-                    Type arg = args[0];
-
-                    Class<?> innerClass;
-                    boolean optional = false;
-
-                    if (arg instanceof Class<?>) {
-                        innerClass = (Class<?>) arg;
-                    } else if (arg instanceof ParameterizedType) {
-                        innerClass = (Class<?>) ((ParameterizedType) arg).getActualTypeArguments()[0];
-                        optional = true;
-                    } else {
-                        throw new IllegalStateException("Failed to find inner class of field " + candidate);
-                    }
-
+                if (candidate.getGenericType() instanceof ParameterizedType cpt) {
                     Object serializer;
-
                     try {
                         serializer = candidate.get(null);
+                        Objects.requireNonNull(serializer, "Failed to read serializer: " + candidate.getName());
                     } catch (ReflectiveOperationException e) {
                         throw new IllegalStateException("Failed to read field " + candidate);
                     }
 
-                    if (serializer == null) {
-                        throw new RuntimeException("Failed to read serializer: " + candidate.getName());
+                    // all types are wrapped in EntityDataSerializer<?>
+                    Type serializingType = cpt.getActualTypeArguments()[0];
+                    if (serializingType instanceof ParameterizedType spt) {
+                        Class<?> root = (Class<?>) spt.getRawType();
+                        if (root == Optional.class) {
+                            // special case: EntityDataSerializer<Optional<?>>
+                            Type actualType = spt.getActualTypeArguments()[0];
+                            Serializer wrappedSerializer = new Serializer(actualType, serializer, true);
+                            optionalRegistry.put(actualType, wrappedSerializer);
+                            continue;
+                        }
                     }
 
-                    if (optional) {
-                        optionalRegistry.put(innerClass, new Serializer(innerClass, serializer, true));
-                    } else {
-                        rawRegistry.put(innerClass, new Serializer(innerClass, serializer, false));
-                    }
+                    Serializer wrappedSerializer = new Serializer(serializingType, serializer, false);
+                    rawRegistry.put(serializingType, wrappedSerializer);
                 }
             }
 
-            RAW_REGISTRY = ImmutableMap.copyOf(rawRegistry);
-            OPTIONAL_REGISTRY = ImmutableMap.copyOf(optionalRegistry);
+            RAW_REGISTRY = Map.copyOf(rawRegistry);
+            OPTIONAL_REGISTRY = Map.copyOf(optionalRegistry);
         }
 
         // ---- Helper methods

src/main/java/com/comphenix/protocol/wrappers/WrappedGameProfile.java

@@ -35,18 +35,23 @@ public class WrappedGameProfile extends AbstractWrapper {
             GAME_PROFILE, String.class, String.class);
     private static final ConstructorAccessor CREATE_UUID_STRING = Accessors.getConstructorAccessorOrNull(
             GAME_PROFILE, UUID.class, String.class);
+    private static final ConstructorAccessor CREATE_UUID_STRING_PROPERTIES = Accessors.getConstructorAccessorOrNull(
+            GAME_PROFILE, UUID.class, String.class, MinecraftReflection.getGameProfilePropertyMapClass());
 
     private static final FieldAccessor GET_UUID_STRING = Accessors.getFieldAccessorOrNull(
             GAME_PROFILE, "id", String.class);
 
-    private static final MethodAccessor GET_ID = Accessors.getMethodAccessorOrNull(
-            GAME_PROFILE, "getId");
-    private static final MethodAccessor GET_NAME = Accessors.getMethodAccessorOrNull(
-            GAME_PROFILE, "getName");
-    private static final MethodAccessor GET_PROPERTIES = Accessors.getMethodAccessorOrNull(
-            GAME_PROFILE, "getProperties");
-    private static final MethodAccessor IS_COMPLETE = Accessors.getMethodAccessorOrNull(
-            GAME_PROFILE, "isComplete");
+    private static final MethodAccessor GET_ID = findMethodAccessor(GAME_PROFILE, "id", "getId");
+    private static final MethodAccessor GET_NAME = findMethodAccessor(GAME_PROFILE, "name", "getName");
+    private static final MethodAccessor GET_PROPERTIES = findMethodAccessor(
+            GAME_PROFILE, "properties", "getProperties");
+    private static final MethodAccessor IS_COMPLETE = findMethodAccessor(
+            GAME_PROFILE, "complete", "isComplete");
+
+    static MethodAccessor findMethodAccessor(Class<?> type, String methodName, String fallbackName) {
+        MethodAccessor accessor = Accessors.getMethodAccessorOrNull(type, methodName);
+        return accessor != null ? accessor : Accessors.getMethodAccessorOrNull(type, fallbackName);
+    }
 
     // Fetching game profile
     private static FieldAccessor PLAYER_PROFILE;
@@ -117,6 +122,51 @@ public class WrappedGameProfile extends AbstractWrapper {
         this(parseUUID(id), name);
     }
 
+    private static Object createHandle(UUID uuid, String name, Multimap<String, WrappedSignedProperty> properties) {
+        if (CREATE_STRING_STRING != null) {
+            return CREATE_STRING_STRING.invoke(uuid != null ? uuid.toString() : null, name);
+        }
+
+        if (CREATE_UUID_STRING == null) {
+            throw new IllegalArgumentException("Unsupported GameProfile constructor.");
+        }
+
+        if (!MinecraftVersion.CONFIG_PHASE_PROTOCOL_UPDATE.atOrAbove()) {
+            return CREATE_UUID_STRING.invoke(uuid, name);
+        }
+
+        // 1.20.2+ requires all fields to have a value: null uuid -> UUID(0,0), null name -> empty name
+        // it's not allowed to pass null for both, so we need to pre-check that
+        if (uuid == null && (name == null || name.isEmpty())) {
+            throw new IllegalArgumentException("Name and ID cannot both be blank");
+        }
+
+        // 1.21.9+ made PropertyMap's underlying map immutable, so we need to override it with a mutable map
+        if (MinecraftVersion.v1_21_9.atOrAbove()) {
+            return CREATE_UUID_STRING_PROPERTIES.invoke(uuid == null ? MinecraftGenerator.SYS_UUID : uuid, name == null ? "" : name,
+                    convertPropertyMap(properties));
+        }
+
+        return CREATE_UUID_STRING.invoke(uuid == null ? MinecraftGenerator.SYS_UUID : uuid, name == null ? "" : name);
+    }
+
+    private static Object convertPropertyMap(Multimap<String, WrappedSignedProperty> properties) {
+        com.comphenix.protocol.wrappers.MutablePropertyMap map =
+                new com.comphenix.protocol.wrappers.MutablePropertyMap();
+
+        if (properties == null || properties.isEmpty()) {
+            return map;
+        }
+
+        for (String key : properties.keySet()) {
+            for (WrappedSignedProperty property : properties.get(key)) {
+                map.put(key, (com.mojang.authlib.properties.Property) property.getHandle());
+            }
+        }
+
+        return map;
+    }
+
     /**
      * Construct a new game profile with the given properties.
      * <p>
@@ -127,24 +177,12 @@ public class WrappedGameProfile extends AbstractWrapper {
      */
     public WrappedGameProfile(UUID uuid, String name) {
         super(GAME_PROFILE);
+        setHandle(createHandle(uuid, name, null));
+    }
 
-        if (CREATE_STRING_STRING != null) {
-            setHandle(CREATE_STRING_STRING.invoke(uuid != null ? uuid.toString() : null, name));
-        } else if (CREATE_UUID_STRING != null) {
-            if (MinecraftVersion.CONFIG_PHASE_PROTOCOL_UPDATE.atOrAbove()) {
-                // 1.20.2+ requires all fields to have a value: null uuid -> UUID(0,0), null name -> empty name
-                // it's not allowed to pass null for both, so we need to pre-check that
-                if (uuid == null && (name == null || name.isEmpty())) {
-                    throw new IllegalArgumentException("Name and ID cannot both be blank");
-                }
-
-                setHandle(CREATE_UUID_STRING.invoke(uuid == null ? MinecraftGenerator.SYS_UUID : uuid, name == null ? "" : name));
-            } else {
-                setHandle(CREATE_UUID_STRING.invoke(uuid, name));
-            }
-        } else {
-            throw new IllegalArgumentException("Unsupported GameProfile constructor.");
-        }
+    public WrappedGameProfile(UUID uuid, String name, Multimap<String, WrappedSignedProperty> properties) {
+        super(GAME_PROFILE);
+        setHandle(createHandle(uuid, name, properties));
     }
 
     /**
@@ -157,7 +195,12 @@ public class WrappedGameProfile extends AbstractWrapper {
         if (handle == null)
             return null;
 
-        return new WrappedGameProfile(handle);
+        WrappedGameProfile delegate = new WrappedGameProfile(handle);
+        if (MinecraftVersion.v1_21_9.atOrAbove()) {
+            return new WrappedGameProfile(delegate.getUUID(), delegate.getName(), delegate.getProperties());
+        } else {
+            return delegate;
+        }
     }
 
     /**
@@ -269,7 +312,15 @@ public class WrappedGameProfile extends AbstractWrapper {
 
         if (result == null) {
             Multimap properties = (Multimap) GET_PROPERTIES.invoke(handle);
-            result = new ConvertedMultimap<String, Object, WrappedSignedProperty>(GuavaWrappers.getBukkitMultimap(properties)) {
+
+            Multimap inner;
+            if (MinecraftVersion.v1_21_9.atOrAbove()) {
+                inner = properties;
+            } else {
+                inner = GuavaWrappers.getBukkitMultimap(properties);
+            }
+
+            result = new ConvertedMultimap<String, Object, WrappedSignedProperty>(inner) {
                 @Override
                 protected Object toInner(WrappedSignedProperty outer) {
                     return outer.handle;

src/main/java/com/comphenix/protocol/wrappers/WrappedLevelChunkData.java

@@ -3,8 +3,13 @@ package com.comphenix.protocol.wrappers;
 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.BitSet;
+import java.util.Collections;
 import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Function;
 
+import com.comphenix.protocol.reflect.EquivalentConverter;
 import org.jetbrains.annotations.Nullable;
 
 import com.comphenix.protocol.injector.StructureCache;
@@ -41,22 +46,39 @@ public final class WrappedLevelChunkData {
 
         private static final FieldAccessor BLOCK_ENTITIES_DATA_ACCESSOR;
         private static final FieldAccessor HEIGHTMAPS_ACCESSOR;
+        private static final EquivalentConverter<Map<EnumWrappers.HeightmapType, long[]>> HEIGHTMAPS_CONVERTER;
         private static final FieldAccessor BUFFER_ACCESSOR;
 
         static {
             FuzzyReflection reflection = FuzzyReflection.fromClass(HANDLE_TYPE, true);
 
-            LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR = Accessors.getConstructorAccessor(reflection.getConstructor(FuzzyMethodContract.newBuilder()
-            		.parameterDerivedOf(MinecraftReflection.getPacketDataSerializerClass())
-            		.parameterExactType(int.class)
-            		.parameterExactType(int.class)
-            		.build()));
+            if (MinecraftVersion.v26_3.atOrAbove()) {
+                LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR = Accessors.getConstructorAccessor(reflection.getConstructor(FuzzyMethodContract.newBuilder()
+                        .parameterExactType(Map.class)
+                        .parameterExactType(byte[].class)
+                        .parameterExactType(List.class)
+                        .build()));
+            } else {
+                LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR = Accessors.getConstructorAccessor(reflection.getConstructor(FuzzyMethodContract.newBuilder()
+                        .parameterDerivedOf(MinecraftReflection.getPacketDataSerializerClass())
+                        .parameterExactType(int.class)
+                        .parameterExactType(int.class)
+                        .build()));
+            }
             BLOCK_ENTITIES_DATA_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
                     .typeExact(List.class)
                     .build()));
-            HEIGHTMAPS_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
-                    .typeExact(MinecraftReflection.getNBTCompoundClass())
-                    .build()));
+            if (MinecraftVersion.v1_21_5.atOrAbove()) {
+                HEIGHTMAPS_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
+                        .typeExact(Map.class)
+                        .build()));
+                HEIGHTMAPS_CONVERTER = BukkitConverters.getMapConverter(EnumWrappers.getHeightmapTypeConverter(), Converters.passthrough(long[].class));
+            } else {
+                HEIGHTMAPS_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
+                        .typeExact(MinecraftReflection.getNBTCompoundClass())
+                        .build()));
+                HEIGHTMAPS_CONVERTER = null;
+            }
             BUFFER_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder().typeExact(byte[].class).build()));
         }
 
@@ -68,22 +90,50 @@ public final class WrappedLevelChunkData {
 
         /**
          * The heightmap of this chunk.
+         * <p>
+         * Removed in Minecraft 1.21.5.
          *
          * @return an NBT-Tag
+         * @deprecated Use {@link ChunkData#getHeightmaps()} instead.
          */
+        @Deprecated
         public NbtCompound getHeightmapsTag() {
             return NbtFactory.fromNMSCompound(HEIGHTMAPS_ACCESSOR.get(handle));
         }
 
         /**
          * Sets the heightmap tag of this chunk.
+         * <p>
+         * Removed in Minecraft 1.21.5.
          *
          * @param heightmapsTag the new heightmaps tag.
+         * @deprecated Use {@link ChunkData#setHeightmaps(Map)} instead.
          */
+        @Deprecated
         public void setHeightmapsTag(NbtCompound heightmapsTag) {
             HEIGHTMAPS_ACCESSOR.set(handle, NbtFactory.fromBase(heightmapsTag).getHandle());
         }
 
+        /**
+         * The heightmap of this chunk.
+         *
+         * @return a map containing the heightmaps
+         */
+        public Map<EnumWrappers.HeightmapType, long[]> getHeightmaps() {
+            return HEIGHTMAPS_CONVERTER.getSpecific(HEIGHTMAPS_ACCESSOR.get(handle));
+        }
+
+        /**
+         * Sets the heightmap tag of this chunk.
+         * <p>
+         * Removed in Minecraft 1.21.5.
+         *
+         * @param heightmaps the new heightmaps.
+         */
+        public void setHeightmaps(Map<EnumWrappers.HeightmapType, long[]> heightmaps) {
+            HEIGHTMAPS_ACCESSOR.set(handle, HEIGHTMAPS_CONVERTER.getGeneric(heightmaps));
+        }
+
         /**
          * The actual structural data of this chunk as bytes.
          *
@@ -130,14 +180,23 @@ public final class WrappedLevelChunkData {
 
         /**
          * Creates a new wrapper using predefined values.
+         * <p>
+         * Removed in Minecraft 1.21.5.
          *
          * @param heightmapsTag   the heightmaps tag
          * @param buffer          the buffer
          * @param blockEntityInfo a list of wrapped block entities
          * @return a newly created wrapper
+         * @deprecated Use {@link ChunkData#fromValues(Map, byte[], List)} instead.
          */
+        @Deprecated
         public static ChunkData fromValues(NbtCompound heightmapsTag, byte[] buffer, List<BlockEntityInfo> blockEntityInfo) {
-            ChunkData data = new ChunkData(LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR.invoke(StructureCache.newNullDataSerializer(), 0, 0));
+            ChunkData data;
+            if (MinecraftVersion.v26_3.atOrAbove()) {
+                data = new ChunkData(LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR.invoke(Collections.emptyMap(), new byte[0], Collections.emptyList()));
+            } else {
+                data = new ChunkData(LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR.invoke(StructureCache.newNullDataSerializer(), 0, 0));
+            }
 
             data.setHeightmapsTag(heightmapsTag);
             data.setBuffer(buffer);
@@ -145,6 +204,29 @@ public final class WrappedLevelChunkData {
 
             return new ChunkData(data);
         }
+
+        /**
+         * Creates a new wrapper using predefined values.
+         *
+         * @param heightmaps      the heightmaps
+         * @param buffer          the buffer
+         * @param blockEntityInfo a list of wrapped block entities
+         * @return a newly created wrapper
+         */
+        public static ChunkData fromValues(Map<EnumWrappers.HeightmapType, long[]> heightmaps, byte[] buffer, List<BlockEntityInfo> blockEntityInfo) {
+            ChunkData data;
+            if (MinecraftVersion.v26_3.atOrAbove()) {
+                data = new ChunkData(LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR.invoke(Collections.emptyMap(), new byte[0], Collections.emptyList()));
+            } else {
+                data = new ChunkData(LEVEL_CHUNK_PACKET_DATA_CONSTRUCTOR.invoke(StructureCache.newNullDataSerializer(), 0, 0));
+            }
+
+            data.setHeightmaps(heightmaps);
+            data.setBuffer(buffer);
+            data.setBlockEntityInfo(blockEntityInfo);
+
+            return new ChunkData(data);
+        }
     }
 
     /**
@@ -372,18 +454,29 @@ public final class WrappedLevelChunkData {
 
         static {
             FuzzyReflection reflection = FuzzyReflection.fromClass(HANDLE_TYPE, true);
-            List<Field> posFields = reflection.getFieldList(FuzzyFieldContract.newBuilder().typeExact(int.class).build());
 
-            BLOCK_ENTITY_INFO_CONSTRUCTOR = Accessors.getConstructorAccessor(HANDLE_TYPE, int.class, int.class,
-                    MinecraftReflection.getBlockEntityTypeClass(), MinecraftReflection.getNBTCompoundClass());
-            PACKED_XZ_ACCESSOR = Accessors.getFieldAccessor(posFields.get(0));
-            Y_ACCESSOR = Accessors.getFieldAccessor(posFields.get(1));
+            if (MinecraftVersion.v26_3.atOrAbove()) {
+                BLOCK_ENTITY_INFO_CONSTRUCTOR = Accessors.getConstructorAccessor(HANDLE_TYPE, byte.class, short.class,
+                        MinecraftReflection.getBlockEntityTypeClass(), Optional.class);
+                PACKED_XZ_ACCESSOR = new IntegerFieldAccessor(Accessors.getFieldAccessor(HANDLE_TYPE, byte.class, true), Number::byteValue);
+                Y_ACCESSOR = new IntegerFieldAccessor(Accessors.getFieldAccessor(HANDLE_TYPE, short.class, true), Number::shortValue);
+                TAG_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
+                    .typeExact(Optional.class)
+                    .build()));
+            } else {
+                List<Field> posFields = reflection.getFieldList(FuzzyFieldContract.newBuilder().typeExact(int.class).build());
+
+                BLOCK_ENTITY_INFO_CONSTRUCTOR = Accessors.getConstructorAccessor(HANDLE_TYPE, int.class, int.class,
+                        MinecraftReflection.getBlockEntityTypeClass(), MinecraftReflection.getNBTCompoundClass());
+                PACKED_XZ_ACCESSOR = Accessors.getFieldAccessor(posFields.get(0));
+                Y_ACCESSOR = Accessors.getFieldAccessor(posFields.get(1));
+                TAG_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
+                    .typeExact(MinecraftReflection.getNBTCompoundClass())
+                    .build()));
+            }
             TYPE_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
                     .typeExact(MinecraftReflection.getBlockEntityTypeClass())
                     .build()));
-            TAG_ACCESSOR = Accessors.getFieldAccessor(reflection.getField(FuzzyFieldContract.newBuilder()
-                    .typeExact(MinecraftReflection.getNBTCompoundClass())
-                    .build()));
         }
 
         public BlockEntityInfo(Object handle) {
@@ -472,6 +565,9 @@ public final class WrappedLevelChunkData {
         @Nullable
         public NbtCompound getAdditionalData() {
             Object tagHandle = TAG_ACCESSOR.get(handle);
+            if (MinecraftVersion.v26_3.atOrAbove()) {
+                tagHandle = ((Optional<Object>) tagHandle).orElse(null);
+            }
 
             return tagHandle == null ? null : NbtFactory.fromNMSCompound(tagHandle);
         }
@@ -482,7 +578,11 @@ public final class WrappedLevelChunkData {
          * @param additionalData the additional data for this block entity, can be {@code null}
          */
         public void setAdditionalData(@Nullable NbtCompound additionalData) {
-            TAG_ACCESSOR.set(handle, additionalData == null ? null : NbtFactory.fromBase(additionalData).getHandle());
+            if (MinecraftVersion.v26_3.atOrAbove()) {
+                TAG_ACCESSOR.set(handle, Optional.ofNullable(additionalData).map(data -> NbtFactory.fromBase(data).getHandle()));
+            } else {
+                TAG_ACCESSOR.set(handle, additionalData == null ? null : NbtFactory.fromBase(additionalData).getHandle());
+            }
         }
 
         /**
@@ -507,12 +607,46 @@ public final class WrappedLevelChunkData {
          * @param additionalData An NBT-Tag containing additional information. Can be {@code null}.
          */
         public static BlockEntityInfo fromValues(int sectionX, int sectionZ, int y, MinecraftKey typeKey, @Nullable NbtCompound additionalData) {
-            return new BlockEntityInfo(BLOCK_ENTITY_INFO_CONSTRUCTOR.invoke(
+            if (MinecraftVersion.v26_3.atOrAbove()) {
+                return new BlockEntityInfo(BLOCK_ENTITY_INFO_CONSTRUCTOR.invoke(
+                    (byte) (sectionX << 4 | sectionZ),
+                    (short) y,
+                    REGISTRY.get(typeKey),
+                    Optional.ofNullable(additionalData).map(data -> NbtFactory.fromBase(data).getHandle())
+                ));
+            } else {
+                return new BlockEntityInfo(BLOCK_ENTITY_INFO_CONSTRUCTOR.invoke(
                     sectionX << 4 | sectionZ,
                     y,
                     REGISTRY.get(typeKey),
                     additionalData == null ? null : NbtFactory.fromBase(additionalData).getHandle()
-            ));
+                ));
+            }
+        }
+    }
+
+    private final static class IntegerFieldAccessor implements FieldAccessor {
+        private final FieldAccessor inner;
+        private final Function<Number, Object> toType;
+
+        public IntegerFieldAccessor(FieldAccessor inner, Function<Number, Object> toType) {
+            this.inner = inner;
+            this.toType = toType;
+        }
+
+        @Override
+        public Object get(Object instance) {
+            return ((Number) this.inner.get(instance)).intValue();
+        }
+
+        @Override
+        public void set(Object instance, Object value) {
+            this.inner.set(instance, this.toType.apply((Integer) value));
+        }
+
+        @Override
+        public Field getField() {
+            return this.inner.getField();
         }
     }
 }

src/main/java/com/comphenix/protocol/wrappers/WrappedParticle.java

@@ -27,6 +27,15 @@ public class WrappedParticle<T> {
     private static MethodAccessor toNMS;
     private static MethodAccessor toCraftData;
 
+    private static final class ItemStackTemplateAccessor {
+        private static final Class<?> TYPE = MinecraftReflection.getMinecraftClass("world.item.ItemStackTemplate");
+        private static final MethodAccessor CREATE_ITEM_STACK = Accessors.getMethodAccessor(
+                FuzzyReflection.fromClass(TYPE).getMethod(FuzzyMethodContract.newBuilder()
+                        .returnTypeExact(MinecraftReflection.getItemStackClass())
+                        .parameterCount(0)
+                        .build()));
+    }
+
     private static void ensureMethods() {
         if (toBukkit != null && toNMS != null) {
             return;
@@ -176,6 +185,15 @@ public class WrappedParticle<T> {
     }
 
     private static Object getItem(Object handle) {
+        if (MinecraftVersion.v26_1.atOrAbove()) {
+            Object template = new StructureModifier<>(handle.getClass())
+                    .withTarget(handle)
+                    .withType(ItemStackTemplateAccessor.TYPE)
+                    .read(0);
+            Object itemStack = ItemStackTemplateAccessor.CREATE_ITEM_STACK.invoke(template);
+            return BukkitConverters.getItemStackConverter().getSpecific(itemStack);
+        }
+
         return new StructureModifier<>(handle.getClass())
                 .withTarget(handle)
                 .withType(MinecraftReflection.getItemStackClass(), BukkitConverters.getItemStackConverter())
@@ -183,59 +201,80 @@ public class WrappedParticle<T> {
     }
 
     private static Object getRedstone(Object handle) {
-        int r, g, b;
-        float size;
+        Color color;
+        float scale;
 
-        if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
-            StructureModifier<Object> modifier = new StructureModifier<>(handle.getClass()).withTarget(handle);
+        StructureModifier<Object> modifier = new StructureModifier<>(handle.getClass()).withTarget(handle);
+
+        if (MinecraftVersion.v1_21_2.atOrAbove()) {
+            int rgb = (int) modifier.withType(int.class).read(0);
+            color = Color.fromRGB(rgb);
+            scale = (float) modifier.withType(float.class).read(0);
+        } else if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
             org.joml.Vector3f rgb = (org.joml.Vector3f) modifier.withType(org.joml.Vector3f.class).read(0);
 
-            r = (int) (rgb.x() * 255);
-            g = (int) (rgb.y() * 255);
-            b = (int) (rgb.z() * 255);
-            size = (float) modifier.withType(float.class).read(0);
+            int red = (int) (rgb.x() * 255);
+            int green = (int) (rgb.y() * 255);
+            int blue = (int) (rgb.z() * 255);
+
+            color = Color.fromRGB(red, green, blue);
+            scale = (float) modifier.withType(float.class).read(0);
         } else if (MinecraftVersion.CAVES_CLIFFS_1.atOrAbove()) {
             if (VECTOR_3FA == null) {
                 VECTOR_3FA = MinecraftReflection.getLibraryClass("com.mojang.math.Vector3fa");
             }
 
-            StructureModifier<Object> modifier = new StructureModifier<>(handle.getClass()).withTarget(handle);
-
             Object rgb = modifier.withType(VECTOR_3FA).read(0);
             StructureModifier<Object> rgbModifier = new StructureModifier<>(VECTOR_3FA).withTarget(rgb);
 
-            r = (int) (rgbModifier.<Float>withType(float.class).read(0) * 255);
-            g = (int) (rgbModifier.<Float>withType(float.class).read(1) * 255);
-            b = (int) (rgbModifier.<Float>withType(float.class).read(2) * 255);
-            size = (float) modifier.withType(float.class).read(0);
+            int red = (int) (rgbModifier.<Float>withType(float.class).read(0) * 255);
+            int green = (int) (rgbModifier.<Float>withType(float.class).read(1) * 255);
+            int blue = (int) (rgbModifier.<Float>withType(float.class).read(2) * 255);
+
+            color = Color.fromRGB(red, green, blue);
+            scale = (float) modifier.withType(float.class).read(0);
         } else {
-            StructureModifier<Float> modifier = new StructureModifier<>(handle.getClass()).withTarget(handle).withType(float.class);
-            r = (int) (modifier.read(0) * 255);
-            g = (int) (modifier.read(1) * 255);
-            b = (int) (modifier.read(2) * 255);
-            size = modifier.read(3);
+            StructureModifier<Float> floatModifier = modifier.withType(float.class);
+
+            int red = (int) (floatModifier.read(0) * 255);
+            int green = (int) (floatModifier.read(1) * 255);
+            int blue = (int) (floatModifier.read(2) * 255);
+
+            color = Color.fromRGB(red, green, blue);
+            scale = floatModifier.read(3);
         }
 
-        return new Particle.DustOptions(Color.fromRGB(r, g, b), size);
+        return new Particle.DustOptions(color, scale);
     }
 
     private static Object getDustTransition(Object handle) {
-        int fromR, fromG, fromB, toR, toG, toB;
-        float size;
+        Color fromColor, toColor;
+        float scale;
 
-        if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
+        if (MinecraftVersion.v1_21_2.atOrAbove()) {
+            StructureModifier<Object> modifier = new StructureModifier<>(handle.getClass()).withTarget(handle);
+            int fromRgb = (int) modifier.withType(int.class).read(0);
+            fromColor = Color.fromRGB(fromRgb);
+
+            int toRgb = (int) modifier.withType(int.class).read(1);
+            toColor = Color.fromRGB(toRgb);
+
+            scale = (float) modifier.withType(float.class).read(0);
+        } else if (MinecraftVersion.FEATURE_PREVIEW_UPDATE.atOrAbove()) {
             StructureModifier<Object> modifier = new StructureModifier<>(handle.getClass()).withTarget(handle);
             org.joml.Vector3f toRGB = (org.joml.Vector3f) modifier.withType(org.joml.Vector3f.class).read(1);
             org.joml.Vector3f fromRGB = (org.joml.Vector3f) modifier.withType(org.joml.Vector3f.class).read(0);
-            size = (float) modifier.withType(float.class).read(0);
+            scale = (float) modifier.withType(float.class).read(0);
 
-            fromR = (int) (fromRGB.x() * 255);
-            fromG = (int) (fromRGB.y() * 255);
-            fromB = (int) (fromRGB.z() * 255);
+            int fromR = (int) (fromRGB.x() * 255);
+            int fromG = (int) (fromRGB.y() * 255);
+            int fromB = (int) (fromRGB.z() * 255);
+            fromColor = Color.fromRGB(fromR, fromG, fromB);
 
-            toR = (int) (toRGB.x() * 255);
-            toG = (int) (toRGB.y() * 255);
-            toB = (int) (toRGB.z() * 255);
+            int toR = (int) (toRGB.x() * 255);
+            int toG = (int) (toRGB.y() * 255);
+            int toB = (int) (toRGB.z() * 255);
+            toColor = Color.fromRGB(toR, toG, toB);
         } else if (MinecraftVersion.CAVES_CLIFFS_1.atOrAbove()) {
             if (VECTOR_3FA == null) {
                 VECTOR_3FA = MinecraftReflection.getLibraryClass("com.mojang.math.Vector3fa");
@@ -245,37 +284,42 @@ public class WrappedParticle<T> {
 
             Object toRGB = modifier.withType(VECTOR_3FA).read(0);
             Object fromRGB = modifier.withType(VECTOR_3FA).read(1);
-            size = (float) modifier.withType(float.class).read(0);
+            scale = (float) modifier.withType(float.class).read(0);
             StructureModifier<Object> rgbModifier = new StructureModifier<>(VECTOR_3FA).withTarget(fromRGB);
             StructureModifier<Object> rgbModifier2 = new StructureModifier<>(VECTOR_3FA).withTarget(toRGB);
 
-            fromR = (int) (rgbModifier.<Float>withType(float.class).read(0) * 255);
-            fromG = (int) (rgbModifier.<Float>withType(float.class).read(1) * 255);
-            fromB = (int) (rgbModifier.<Float>withType(float.class).read(2) * 255);
+            int fromR = (int) (rgbModifier.<Float>withType(float.class).read(0) * 255);
+            int fromG = (int) (rgbModifier.<Float>withType(float.class).read(1) * 255);
+            int fromB = (int) (rgbModifier.<Float>withType(float.class).read(2) * 255);
+            fromColor = Color.fromRGB(fromR, fromG, fromB);
 
-            toR = (int) (rgbModifier2.<Float>withType(float.class).read(0) * 255);
-            toG = (int) (rgbModifier2.<Float>withType(float.class).read(1) * 255);
-            toB = (int) (rgbModifier2.<Float>withType(float.class).read(2) * 255);
+            int toR = (int) (rgbModifier2.<Float>withType(float.class).read(0) * 255);
+            int toG = (int) (rgbModifier2.<Float>withType(float.class).read(1) * 255);
+            int toB = (int) (rgbModifier2.<Float>withType(float.class).read(2) * 255);
+            toColor = Color.fromRGB(toR, toG, toB);
         } else {
             StructureModifier<Float> modifier = new StructureModifier<>(handle.getClass()).withTarget(handle).withType(float.class);
-            toR = (int) (modifier.read(0) * 255);
-            toG = (int) (modifier.read(1) * 255);
-            toB = (int) (modifier.read(2) * 255);
-            size = modifier.read(3);
-            fromR = (int) (modifier.read(4) * 255);
-            fromG = (int) (modifier.read(5) * 255);
-            fromB = (int) (modifier.read(6) * 255);
+            int toR = (int) (modifier.read(0) * 255);
+            int toG = (int) (modifier.read(1) * 255);
+            int toB = (int) (modifier.read(2) * 255);
+            toColor = Color.fromRGB(toR, toG, toB);
+
+            scale = modifier.read(3);
+
+            int fromR = (int) (modifier.read(4) * 255);
+            int fromG = (int) (modifier.read(5) * 255);
+            int fromB = (int) (modifier.read(6) * 255);
+            fromColor = Color.fromRGB(fromR, fromG, fromB);
         }
 
-        return new Particle.DustTransition(Color.fromRGB(fromR, fromG, fromB), Color.fromRGB(toR, toG, toB), size);
+        return new Particle.DustTransition(fromColor, toColor, scale);
     }
 
     public static <T> WrappedParticle<T> create(Particle particle, T data) {
         ensureMethods();
 
         Object bukkitData = data;
-        if (data instanceof WrappedBlockData) {
-            WrappedBlockData blockData = (WrappedBlockData) data;
+        if (data instanceof WrappedBlockData blockData) {
             bukkitData = toCraftData.invoke(null, blockData.getHandle());
         }
 

src/main/java/com/comphenix/protocol/wrappers/WrappedPositionMoveRotation.java

@@ -0,0 +1,183 @@
+package com.comphenix.protocol.wrappers;
+
+import com.comphenix.protocol.reflect.EquivalentConverter;
+import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.reflect.accessors.ConstructorAccessor;
+import com.comphenix.protocol.utility.MinecraftReflection;
+
+import org.bukkit.util.Vector;
+
+/**
+ * Wrapper around the NMS {@code PositionMoveRotation} record, introduced in Minecraft 1.21.2.
+ * <p>
+ * This type is used in packets such as {@code ENTITY_TELEPORT} and {@code ENTITY_POSITION_SYNC}
+ * to represent combined position, movement delta and rotation.
+ * <p>
+ * Example usage:
+ * <pre>{@code
+ * WrappedPositionMoveRotation posRot = WrappedPositionMoveRotation.create(
+ *         new Vector(x, y, z),   // position
+ *         new Vector(0, 0, 0),   // deltaMovement
+ *         yaw,                   // yRot
+ *         pitch                  // xRot
+ * );
+ * packet.getPositionMoveRotation().write(0, posRot);
+ * }</pre>
+ */
+public class WrappedPositionMoveRotation extends AbstractWrapper {
+
+    private static Class<?> NMS_CLASS;
+    private static ConstructorAccessor CONSTRUCTOR;
+    private static StructureModifier<Object> BASE_MODIFIER;
+
+    private final StructureModifier<Object> modifier;
+
+    private WrappedPositionMoveRotation(Object handle) {
+        super(getNmsClass());
+        setHandle(handle);
+        this.modifier = getBaseModifier().withTarget(handle);
+    }
+
+    private static Class<?> getNmsClass() {
+        if (NMS_CLASS == null) {
+            NMS_CLASS = MinecraftReflection.getPositionMoveRotationClass();
+        }
+        return NMS_CLASS;
+    }
+
+    private static StructureModifier<Object> getBaseModifier() {
+        if (BASE_MODIFIER == null) {
+            BASE_MODIFIER = new StructureModifier<>(getNmsClass());
+        }
+        return BASE_MODIFIER;
+    }
+
+    private static ConstructorAccessor getConstructor() {
+        if (CONSTRUCTOR == null) {
+            CONSTRUCTOR = Accessors.getConstructorAccessor(
+                    getNmsClass(),
+                    MinecraftReflection.getVec3DClass(),
+                    MinecraftReflection.getVec3DClass(),
+                    float.class,
+                    float.class
+            );
+        }
+        return CONSTRUCTOR;
+    }
+
+    /**
+     * Creates a new {@code WrappedPositionMoveRotation} from the given NMS handle.
+     *
+     * @param handle - the NMS {@code PositionMoveRotation} instance.
+     * @return the wrapper.
+     */
+    public static WrappedPositionMoveRotation fromHandle(Object handle) {
+        return new WrappedPositionMoveRotation(handle);
+    }
+
+    /**
+     * Creates a new {@code WrappedPositionMoveRotation} with the given values.
+     *
+     * @param position      - the absolute position.
+     * @param deltaMovement - the movement delta (velocity).
+     * @param yRot          - the yaw rotation.
+     * @param xRot          - the pitch rotation.
+     * @return a new wrapper instance.
+     */
+    public static WrappedPositionMoveRotation create(Vector position, Vector deltaMovement, float yRot, float xRot) {
+        EquivalentConverter<Vector> conv = BukkitConverters.getVectorConverter();
+        Object handle = getConstructor().invoke(
+                conv.getGeneric(position),
+                conv.getGeneric(deltaMovement),
+                yRot,
+                xRot
+        );
+        return new WrappedPositionMoveRotation(handle);
+    }
+
+    /**
+     * Retrieves the absolute position component.
+     *
+     * @return the position as a Bukkit {@link Vector}.
+     */
+    public Vector getPosition() {
+        return modifier.withType(MinecraftReflection.getVec3DClass(), BukkitConverters.getVectorConverter()).read(0);
+    }
+
+    /**
+     * Sets the absolute position component.
+     *
+     * @param position - the new position.
+     */
+    public void setPosition(Vector position) {
+        modifier.withType(MinecraftReflection.getVec3DClass(), BukkitConverters.getVectorConverter()).write(0, position);
+    }
+
+    /**
+     * Retrieves the movement delta (velocity) component.
+     *
+     * @return the delta movement as a Bukkit {@link Vector}.
+     */
+    public Vector getDeltaMovement() {
+        return modifier.withType(MinecraftReflection.getVec3DClass(), BukkitConverters.getVectorConverter()).read(1);
+    }
+
+    /**
+     * Sets the movement delta (velocity) component.
+     *
+     * @param deltaMovement - the new delta movement.
+     */
+    public void setDeltaMovement(Vector deltaMovement) {
+        modifier.withType(MinecraftReflection.getVec3DClass(), BukkitConverters.getVectorConverter()).write(1, deltaMovement);
+    }
+
+    /**
+     * Retrieves the yaw rotation (y-axis rotation).
+     *
+     * @return the yaw as a float.
+     */
+    public float getYRot() {
+        StructureModifier<Float> floats = modifier.withType(float.class);
+        return floats.read(0);
+    }
+
+    /**
+     * Sets the yaw rotation (y-axis rotation).
+     *
+     * @param yRot - the new yaw value.
+     */
+    public void setYRot(float yRot) {
+        modifier.withType(float.class).write(0, yRot);
+    }
+
+    /**
+     * Retrieves the pitch rotation (x-axis rotation).
+     *
+     * @return the pitch as a float.
+     */
+    public float getXRot() {
+        StructureModifier<Float> floats = modifier.withType(float.class);
+        return floats.read(1);
+    }
+
+    /**
+     * Sets the pitch rotation (x-axis rotation).
+     *
+     * @param xRot - the new pitch value.
+     */
+    public void setXRot(float xRot) {
+        modifier.withType(float.class).write(1, xRot);
+    }
+
+    /**
+     * Returns an {@link EquivalentConverter} that converts between {@code WrappedPositionMoveRotation}
+     * and the underlying NMS handle.
+     *
+     * @return the converter.
+     */
+    public static EquivalentConverter<WrappedPositionMoveRotation> getConverter() {
+        return Converters.handle(AbstractWrapper::getHandle,
+                WrappedPositionMoveRotation::fromHandle, WrappedPositionMoveRotation.class);
+    }
+}

src/main/java/com/comphenix/protocol/wrappers/WrappedPositionPath.java

@@ -0,0 +1,207 @@
+package com.comphenix.protocol.wrappers;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.ParameterizedType;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+import com.comphenix.protocol.reflect.EquivalentConverter;
+import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.reflect.accessors.ConstructorAccessor;
+import com.comphenix.protocol.utility.MinecraftReflection;
+
+import com.google.common.base.Preconditions;
+import org.bukkit.util.Vector;
+
+/**
+ * Wrapper around the NMS {@code PositionPath} type, introduced in Minecraft 26.3.
+ * <p>
+ * Used by {@code ENTITY_POSITION_SYNC} to store the entity position. A path is either linear (a single position) or
+ * stepped (several positions reached at given ticks).
+ * <pre>{@code
+ * packet.getPositionPaths().write(0, WrappedPositionPath.linear(new Vector(x, y, z)));
+ * }</pre>
+ */
+public final class WrappedPositionPath extends AbstractWrapper {
+
+    private static Class<?> STEPPED_CLASS;
+
+    private static ConstructorAccessor LINEAR_CONSTRUCTOR;
+    private static ConstructorAccessor STEPPED_CONSTRUCTOR;
+    private static ConstructorAccessor STEP_CONSTRUCTOR;
+
+    private static StructureModifier<Object> LINEAR_MODIFIER;
+    private static StructureModifier<Object> STEPPED_MODIFIER;
+    private static StructureModifier<Object> STEP_MODIFIER;
+
+    private static volatile boolean initialized;
+
+    private WrappedPositionPath(Object handle) {
+        super(getPositionPathClass());
+        setHandle(handle);
+    }
+
+    private static Class<?> getPositionPathClass() {
+        return MinecraftReflection.getPositionPathClass()
+                .orElseThrow(() -> new UnsupportedOperationException("PositionPath requires Minecraft 26.3 or newer"));
+    }
+
+    private static void initialize() {
+        if (initialized) {
+            return;
+        }
+
+        Class<?> pathClass = getPositionPathClass();
+        Class<?> vec3Class = MinecraftReflection.getVec3DClass();
+        Class<?> linearClass = null;
+        Class<?> stepClass = null;
+
+        for (Class<?> nested : pathClass.getDeclaredClasses()) {
+            if (!pathClass.isAssignableFrom(nested)) {
+                continue;
+            }
+
+            Field steps = getListField(nested);
+            if (steps != null) {
+                STEPPED_CLASS = nested;
+                stepClass = (Class<?>) ((ParameterizedType) steps.getGenericType()).getActualTypeArguments()[0];
+            } else {
+                linearClass = nested;
+            }
+        }
+
+        Preconditions.checkState(linearClass != null && STEPPED_CLASS != null, "Unable to find PositionPath implementations");
+
+        LINEAR_CONSTRUCTOR = Accessors.getConstructorAccessor(linearClass, vec3Class);
+        STEPPED_CONSTRUCTOR = Accessors.getConstructorAccessor(STEPPED_CLASS, List.class);
+        STEP_CONSTRUCTOR = Accessors.getConstructorAccessor(stepClass, vec3Class, int.class);
+
+        LINEAR_MODIFIER = new StructureModifier<>(linearClass);
+        STEPPED_MODIFIER = new StructureModifier<>(STEPPED_CLASS);
+        STEP_MODIFIER = new StructureModifier<>(stepClass);
+        initialized = true;
+    }
+
+    private static Field getListField(Class<?> clazz) {
+        for (Field field : clazz.getDeclaredFields()) {
+            if (List.class.equals(field.getType())) {
+                return field;
+            }
+        }
+        return null;
+    }
+
+    public static WrappedPositionPath fromHandle(Object handle) {
+        return new WrappedPositionPath(handle);
+    }
+
+    /**
+     * Creates a linear path.
+     *
+     * @param position - the absolute position.
+     * @return the path.
+     */
+    public static WrappedPositionPath linear(Vector position) {
+        Preconditions.checkNotNull(position, "position cannot be NULL");
+        initialize();
+        return new WrappedPositionPath(LINEAR_CONSTRUCTOR.invoke(BukkitConverters.getVectorConverter().getGeneric(position)));
+    }
+
+    /**
+     * Creates a stepped path ending at the position of the last step.
+     *
+     * @param steps - the steps in order, must not be empty.
+     * @return the path.
+     */
+    public static WrappedPositionPath stepped(List<Step> steps) {
+        Preconditions.checkArgument(steps != null && !steps.isEmpty(), "steps cannot be empty");
+        initialize();
+
+        EquivalentConverter<Vector> vectorConverter = BukkitConverters.getVectorConverter();
+        List<Object> handles = new ArrayList<>(steps.size());
+        for (Step step : steps) {
+            handles.add(STEP_CONSTRUCTOR.invoke(vectorConverter.getGeneric(step.getPosition()), step.getTickOffset()));
+        }
+
+        return new WrappedPositionPath(STEPPED_CONSTRUCTOR.invoke(Collections.unmodifiableList(handles)));
+    }
+
+    public boolean isStepped() {
+        initialize();
+        return STEPPED_CLASS.isInstance(handle);
+    }
+
+    /**
+     * @return the final position of the path.
+     */
+    public Vector getEndPosition() {
+        StructureModifier<Object> modifier = isStepped() ? STEPPED_MODIFIER : LINEAR_MODIFIER;
+        return modifier.withTarget(handle)
+                .withType(MinecraftReflection.getVec3DClass(), BukkitConverters.getVectorConverter())
+                .read(0);
+    }
+
+    /**
+     * @return the steps of a stepped path.
+     * @throws IllegalStateException if the path is linear.
+     */
+    public List<Step> getSteps() {
+        Preconditions.checkState(isStepped(), "Linear paths have no steps");
+
+        List<?> handles = STEPPED_MODIFIER.withTarget(handle).<List<?>>withType(List.class).read(0);
+        List<Step> steps = new ArrayList<>(handles.size());
+        for (Object stepHandle : handles) {
+            StructureModifier<Object> step = STEP_MODIFIER.withTarget(stepHandle);
+            Vector position = step.withType(MinecraftReflection.getVec3DClass(), BukkitConverters.getVectorConverter()).read(0);
+            steps.add(new Step(position, step.<Integer>withType(int.class).read(0)));
+        }
+
+        return Collections.unmodifiableList(steps);
+    }
+
+    public static EquivalentConverter<WrappedPositionPath> getConverter() {
+        return Converters.ignoreNull(Converters.handle(AbstractWrapper::getHandle,
+                WrappedPositionPath::fromHandle, WrappedPositionPath.class));
+    }
+
+    public static final class Step {
+
+        private final Vector position;
+        private final int tickOffset;
+
+        public Step(Vector position, int tickOffset) {
+            this.position = Preconditions.checkNotNull(position, "position cannot be NULL").clone();
+            this.tickOffset = tickOffset;
+        }
+
+        public Vector getPosition() {
+            return position.clone();
+        }
+
+        public int getTickOffset() {
+            return tickOffset;
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) return true;
+            if (!(obj instanceof Step)) return false;
+
+            Step that = (Step) obj;
+            return tickOffset == that.tickOffset && position.equals(that.position);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(position, tickOffset);
+        }
+
+        @Override
+        public String toString() {
+            return "Step[position=" + position + ", tickOffset=" + tickOffset + "]";
+        }
+    }
+}

src/main/java/com/comphenix/protocol/wrappers/WrappedStatistic.java

@@ -16,15 +16,26 @@ import com.comphenix.protocol.utility.MinecraftReflection;
 public class WrappedStatistic extends AbstractWrapper {
     private static final Class<?> STATISTIC = MinecraftReflection.getStatisticClass();
     private static final Class<?> STATISTIC_LIST = MinecraftReflection.getStatisticListClass();
-
+    private static final FieldAccessor GET_NAME_FIELD;
+    private static final MethodAccessor GET_NAME_METHOD;
 
     static {
+        FieldAccessor[] nameFields = Accessors.getFieldAccessorArray(STATISTIC, String.class, true);
+        if (nameFields.length > 0) {
+            GET_NAME_FIELD = nameFields[0];
+            GET_NAME_METHOD = null;
+        } else {
+            GET_NAME_FIELD = null;
+            GET_NAME_METHOD = Accessors.getMethodAccessor(
+                    FuzzyReflection.fromClass(STATISTIC.getSuperclass(), true)
+                            .getMethodByReturnTypeAndParameters("getName", String.class));
+        }
+
         try {
             FIND_STATISTICS = Accessors.getMethodAccessor(
                     FuzzyReflection.fromClass(STATISTIC_LIST).getMethodByReturnTypeAndParameters(
                             "findStatistic", STATISTIC, new Class<?>[]{String.class}));
             MAP_ACCESSOR = Accessors.getFieldAccessor(STATISTIC_LIST, Map.class, true);
-            GET_NAME = Accessors.getFieldAccessor(STATISTIC, String.class, true);
         } catch (Exception ex) {
             // TODO - find an alternative
         }
@@ -32,7 +43,6 @@ public class WrappedStatistic extends AbstractWrapper {
 
     private static MethodAccessor FIND_STATISTICS;
     private static FieldAccessor MAP_ACCESSOR;
-    private static FieldAccessor GET_NAME;
     
     private final String name;
     
@@ -40,7 +50,9 @@ public class WrappedStatistic extends AbstractWrapper {
         super(STATISTIC);
         setHandle(handle);
         
-        this.name = (String) GET_NAME.get(handle);
+        this.name = GET_NAME_FIELD != null
+                ? (String) GET_NAME_FIELD.get(handle)
+                : (String) GET_NAME_METHOD.invoke(handle);
     }
     
     /**

src/main/java/com/comphenix/protocol/wrappers/WrappedTeamParameters.java

@@ -1,11 +1,17 @@
 package com.comphenix.protocol.wrappers;
 
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Optional;
+
 import com.comphenix.protocol.injector.StructureCache;
 import com.comphenix.protocol.reflect.StructureModifier;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.MinecraftVersion;
+import com.comphenix.protocol.wrappers.EnumWrappers.TeamCollisionRule;
+import com.comphenix.protocol.wrappers.EnumWrappers.TeamVisibility;
 import com.google.common.base.Preconditions;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 /**
  * A wrapper around the team parameters NMS class.
@@ -35,11 +41,16 @@ public class WrappedTeamParameters extends AbstractWrapper {
     }
 
     private final StructureModifier<Object> modifier;
+    private final StructureModifier<TeamVisibility> visiblityModifier;
+    private final StructureModifier<TeamCollisionRule> collisionRuleModifier;
 
     public WrappedTeamParameters(Object handle) {
         super(getNmsClassOrThrow());
         setHandle(handle);
+
         this.modifier = new StructureModifier<>(getNmsClassOrThrow()).withTarget(handle);
+        this.visiblityModifier = this.modifier.withType(EnumWrappers.getTeamVisibilityClass(), EnumWrappers.getTeamVisibilityConverter());
+        this.collisionRuleModifier = this.modifier.withType(EnumWrappers.getTeamCollisionRuleClass(), EnumWrappers.getTeamCollisionRuleConverter());
     }
 
     @NotNull
@@ -58,22 +69,49 @@ public class WrappedTeamParameters extends AbstractWrapper {
     }
 
     @NotNull
-    public String getNametagVisibility() {
-        return modifier.<String>withType(String.class).read(0);
+    public TeamVisibility getNametagVisibility() {
+        TeamVisibility visibility = this.visiblityModifier.readSafely(0);
+
+        if (visibility == null) {
+            return TeamVisibility.fromName(modifier.<String>withType(String.class).read(0));
+        } else {
+            return visibility;
+        }
     }
 
     @NotNull
-    public String getCollisionRule() {
-        return modifier.<String>withType(String.class).read(1);
+    public TeamCollisionRule getCollisionRule() {
+        TeamCollisionRule collisionRule = this.collisionRuleModifier.readSafely(0);
+
+        if (collisionRule == null) {
+            return TeamCollisionRule.fromName(modifier.<String>withType(String.class).read(1));
+        } else {
+            return collisionRule;
+        }
     }
 
     @NotNull
     public EnumWrappers.ChatFormatting getColor() {
-        Object handle = modifier.withType(EnumWrappers.getChatFormattingClass()).read(0);
-        return EnumWrappers.getChatFormattingConverter().getSpecific(handle);
+        if (MinecraftVersion.v26_2.atOrAbove()) {
+            Optional<?> optional = modifier.<Optional<?>>withType(Optional.class).read(0);
+            Object teamColor = optional != null ? optional.orElse(null) : null;
+            if (teamColor == null) {
+                return EnumWrappers.ChatFormatting.RESET;
+            }
+
+            return EnumWrappers.ChatFormatting.valueOf(((Enum<?>) teamColor).name());
+        }
+
+        return modifier
+                .withType(EnumWrappers.getChatFormattingClass(), EnumWrappers.getChatFormattingConverter())
+                .read(0);
     }
 
     public int getOptions() {
+        if (MinecraftVersion.v26_2.atOrAbove()) {
+            return (byte) modifier.withType(byte.class).read(0);
+        }
+
         return (int) modifier.withType(int.class).read(0);
     }
 
@@ -88,7 +126,8 @@ public class WrappedTeamParameters extends AbstractWrapper {
 
     public static class Builder {
         private WrappedChatComponent displayName, prefix, suffix;
-        private String nametagVisibility, collisionRule;
+        private TeamVisibility nametagVisibility;
+        private TeamCollisionRule collisionRule;
         private EnumWrappers.ChatFormatting color;
         private int options;
 
@@ -122,18 +161,36 @@ public class WrappedTeamParameters extends AbstractWrapper {
             return this;
         }
 
-        public Builder nametagVisibility(@NotNull String nametagVisibility) {
+        public Builder nametagVisibility(@NotNull TeamVisibility nametagVisibility) {
             Preconditions.checkNotNull(nametagVisibility);
             this.nametagVisibility = nametagVisibility;
             return this;
         }
 
-        public Builder collisionRule(@NotNull String collisionRule) {
+        /**
+         * Compatibility stub for FeatherBoard – accepts raw String visibility.
+         */
+        public Builder nametagVisibility(@NotNull String visibility) {
+            Preconditions.checkNotNull(visibility, "visibility string cannot be null");
+            this.nametagVisibility = TeamVisibility.fromName(visibility);
+            return this;
+        }
+
+        public Builder collisionRule(@NotNull TeamCollisionRule collisionRule) {
             Preconditions.checkNotNull(collisionRule);
             this.collisionRule = collisionRule;
             return this;
         }
 
+        /**
+         * Compatibility stub for FeatherBoard – accepts raw String collision rules.
+         */
+        public Builder collisionRule(@NotNull String rule) {
+            Preconditions.checkNotNull(rule, "collision rule cannot be null");
+            this.collisionRule = TeamCollisionRule.fromName(rule);
+            return this;
+        }
+
         public Builder color(@NotNull EnumWrappers.ChatFormatting color) {
             Preconditions.checkNotNull(color);
             this.color = color;
@@ -160,11 +217,36 @@ public class WrappedTeamParameters extends AbstractWrapper {
             wrapped.writeComponent(0, displayName);
             wrapped.writeComponent(1, prefix);
             wrapped.writeComponent(2, suffix);
-            wrapped.modifier.withType(String.class).write(0, nametagVisibility);
-            wrapped.modifier.withType(String.class).write(1, collisionRule);
-            wrapped.modifier.withType(EnumWrappers.getChatFormattingClass()).write(0, EnumWrappers.getChatFormattingConverter().getGeneric(color));
-            wrapped.modifier.withType(int.class).write(0, options);
+
+            if (MinecraftVersion.v1_21_5.atOrAbove()) {
+                wrapped.visiblityModifier.writeSafely(0, nametagVisibility);
+                wrapped.collisionRuleModifier.writeSafely(0, collisionRule);
+            } else {
+                wrapped.modifier.withType(String.class).writeSafely(0, nametagVisibility.toString());
+                wrapped.modifier.withType(String.class).writeSafely(1, collisionRule.toString());
+            }
+
+            if (MinecraftVersion.v26_2.atOrAbove()) {
+                wrapped.modifier.withType(Optional.class).write(0, Optional.ofNullable(toNmsTeamColor(color)));
+                wrapped.modifier.withType(byte.class).write(0, (byte) options);
+            } else {
+                wrapped.modifier.withType(EnumWrappers.getChatFormattingClass()).write(0, EnumWrappers.getChatFormattingConverter().getGeneric(color));
+                wrapped.modifier.withType(int.class).write(0, options);
+            }
             return wrapped;
         }
+
+        @SuppressWarnings({"unchecked", "rawtypes"})
+        private static Object toNmsTeamColor(EnumWrappers.ChatFormatting color) {
+            Class<?> teamColorClass = MinecraftReflection.getTeamColorClass()
+                    .orElseThrow(() -> new IllegalStateException("TeamColor class doesn't exist on this server version"));
+
+            try {
+                return Enum.valueOf((Class) teamColorClass, color.name());
+            } catch (IllegalArgumentException ex) {
+                // formatting-only values (e.g. RESET) don't map to a team color
+                return null;
+            }
+        }
     }
 }

src/main/java/com/comphenix/protocol/wrappers/WrappedVecDelta.java

@@ -0,0 +1,237 @@
+package com.comphenix.protocol.wrappers;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.ParameterizedType;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+import com.comphenix.protocol.reflect.EquivalentConverter;
+import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.reflect.accessors.ConstructorAccessor;
+import com.comphenix.protocol.utility.MinecraftReflection;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Wrapper around the NMS {@code VecDelta} type, introduced in Minecraft 26.3.
+ * <p>
+ * Used by {@code REL_ENTITY_MOVE} and {@code REL_ENTITY_MOVE_LOOK} to store the position change. A delta is either
+ * linear (a single offset) or stepped (several offsets reached at given ticks). Offsets use the same encoding as the
+ * short fields of older versions.
+ * <pre>{@code
+ * packet.getVecDeltas().write(0, WrappedVecDelta.linear(deltaX, deltaY, deltaZ));
+ * }</pre>
+ */
+public final class WrappedVecDelta extends AbstractWrapper {
+
+    private static Class<?> STEPPED_CLASS;
+
+    private static ConstructorAccessor LINEAR_CONSTRUCTOR;
+    private static ConstructorAccessor STEPPED_CONSTRUCTOR;
+    private static ConstructorAccessor STEP_CONSTRUCTOR;
+
+    private static StructureModifier<Object> LINEAR_MODIFIER;
+    private static StructureModifier<Object> STEPPED_MODIFIER;
+    private static StructureModifier<Object> STEP_MODIFIER;
+
+    private static volatile boolean initialized;
+
+    private WrappedVecDelta(Object handle) {
+        super(getVecDeltaClass());
+        setHandle(handle);
+    }
+
+    private static Class<?> getVecDeltaClass() {
+        return MinecraftReflection.getVecDeltaClass()
+                .orElseThrow(() -> new UnsupportedOperationException("VecDelta requires Minecraft 26.3 or newer"));
+    }
+
+    private static void initialize() {
+        if (initialized) {
+            return;
+        }
+
+        Class<?> vecDeltaClass = getVecDeltaClass();
+        Class<?> linearClass = null;
+        Class<?> stepClass = null;
+
+        for (Class<?> nested : vecDeltaClass.getDeclaredClasses()) {
+            if (!vecDeltaClass.isAssignableFrom(nested)) {
+                continue;
+            }
+
+            Field steps = getListField(nested);
+            if (steps != null) {
+                STEPPED_CLASS = nested;
+                stepClass = (Class<?>) ((ParameterizedType) steps.getGenericType()).getActualTypeArguments()[0];
+            } else {
+                linearClass = nested;
+            }
+        }
+
+        Preconditions.checkState(linearClass != null && STEPPED_CLASS != null, "Unable to find VecDelta implementations");
+
+        LINEAR_CONSTRUCTOR = Accessors.getConstructorAccessor(linearClass, short.class, short.class, short.class);
+        STEPPED_CONSTRUCTOR = Accessors.getConstructorAccessor(STEPPED_CLASS, List.class);
+        STEP_CONSTRUCTOR = Accessors.getConstructorAccessor(stepClass, short.class, short.class, short.class, int.class);
+
+        LINEAR_MODIFIER = new StructureModifier<>(linearClass);
+        STEPPED_MODIFIER = new StructureModifier<>(STEPPED_CLASS);
+        STEP_MODIFIER = new StructureModifier<>(stepClass);
+        initialized = true;
+    }
+
+    private static Field getListField(Class<?> clazz) {
+        for (Field field : clazz.getDeclaredFields()) {
+            if (List.class.equals(field.getType())) {
+                return field;
+            }
+        }
+        return null;
+    }
+
+    public static WrappedVecDelta fromHandle(Object handle) {
+        return new WrappedVecDelta(handle);
+    }
+
+    /**
+     * Creates a linear delta.
+     *
+     * @param deltaX - the encoded x offset.
+     * @param deltaY - the encoded y offset.
+     * @param deltaZ - the encoded z offset.
+     * @return the delta.
+     */
+    public static WrappedVecDelta linear(short deltaX, short deltaY, short deltaZ) {
+        initialize();
+        return new WrappedVecDelta(LINEAR_CONSTRUCTOR.invoke(deltaX, deltaY, deltaZ));
+    }
+
+    /**
+     * Creates a stepped delta.
+     *
+     * @param steps - the steps in order, must not be empty.
+     * @return the delta.
+     */
+    public static WrappedVecDelta stepped(List<Step> steps) {
+        Preconditions.checkArgument(steps != null && !steps.isEmpty(), "steps cannot be empty");
+        initialize();
+
+        List<Object> handles = new ArrayList<>(steps.size());
+        for (Step step : steps) {
+            handles.add(STEP_CONSTRUCTOR.invoke(step.getDeltaX(), step.getDeltaY(), step.getDeltaZ(), step.getTicks()));
+        }
+
+        return new WrappedVecDelta(STEPPED_CONSTRUCTOR.invoke(Collections.unmodifiableList(handles)));
+    }
+
+    public boolean isStepped() {
+        initialize();
+        return STEPPED_CLASS.isInstance(handle);
+    }
+
+    /**
+     * @return the encoded x offset of a linear delta.
+     * @throws IllegalStateException if the delta is stepped.
+     */
+    public short getDeltaX() {
+        return readLinear(0);
+    }
+
+    /**
+     * @return the encoded y offset of a linear delta.
+     * @throws IllegalStateException if the delta is stepped.
+     */
+    public short getDeltaY() {
+        return readLinear(1);
+    }
+
+    /**
+     * @return the encoded z offset of a linear delta.
+     * @throws IllegalStateException if the delta is stepped.
+     */
+    public short getDeltaZ() {
+        return readLinear(2);
+    }
+
+    private short readLinear(int index) {
+        Preconditions.checkState(!isStepped(), "Stepped deltas have no single offset");
+        return LINEAR_MODIFIER.withTarget(handle).<Short>withType(short.class).read(index);
+    }
+
+    /**
+     * @return the steps of a stepped delta.
+     * @throws IllegalStateException if the delta is linear.
+     */
+    public List<Step> getSteps() {
+        Preconditions.checkState(isStepped(), "Linear deltas have no steps");
+
+        List<?> handles = STEPPED_MODIFIER.withTarget(handle).<List<?>>withType(List.class).read(0);
+        List<Step> steps = new ArrayList<>(handles.size());
+        for (Object stepHandle : handles) {
+            StructureModifier<Object> step = STEP_MODIFIER.withTarget(stepHandle);
+            StructureModifier<Short> shorts = step.withType(short.class);
+            steps.add(new Step(shorts.read(0), shorts.read(1), shorts.read(2), step.<Integer>withType(int.class).read(0)));
+        }
+
+        return Collections.unmodifiableList(steps);
+    }
+
+    public static EquivalentConverter<WrappedVecDelta> getConverter() {
+        return Converters.ignoreNull(Converters.handle(AbstractWrapper::getHandle,
+                WrappedVecDelta::fromHandle, WrappedVecDelta.class));
+    }
+
+    public static final class Step {
+
+        private final short deltaX;
+        private final short deltaY;
+        private final short deltaZ;
+        private final int ticks;
+
+        public Step(short deltaX, short deltaY, short deltaZ, int ticks) {
+            this.deltaX = deltaX;
+            this.deltaY = deltaY;
+            this.deltaZ = deltaZ;
+            this.ticks = ticks;
+        }
+
+        public short getDeltaX() {
+            return deltaX;
+        }
+
+        public short getDeltaY() {
+            return deltaY;
+        }
+
+        public short getDeltaZ() {
+            return deltaZ;
+        }
+
+        public int getTicks() {
+            return ticks;
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) return true;
+            if (!(obj instanceof Step)) return false;
+
+            Step that = (Step) obj;
+            return deltaX == that.deltaX && deltaY == that.deltaY && deltaZ == that.deltaZ && ticks == that.ticks;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(deltaX, deltaY, deltaZ, ticks);
+        }
+
+        @Override
+        public String toString() {
+            return "Step[deltaX=" + deltaX + ", deltaY=" + deltaY + ", deltaZ=" + deltaZ + ", ticks=" + ticks + "]";
+        }
+    }
+}

src/main/java/com/comphenix/protocol/wrappers/nbt/NbtList.java

@@ -23,7 +23,7 @@ public interface NbtList<TType> extends NbtBase<List<NbtBase<TType>>>, Iterable<
     String EMPTY_NAME = "";
     
     /**
-     * Get the type of each element.
+     * Get the type of each element. For heterogeneous lists this will return {@link NbtType#TAG_COMPOUND TAG_COMPOUND}.
      * <p>
      * This will be {@link NbtType#TAG_END TAG_END} if the NBT list has just been created.
      * @return Element type.
@@ -32,8 +32,12 @@ public interface NbtList<TType> extends NbtBase<List<NbtBase<TType>>>, Iterable<
 
     /**
      * Set the type of each element.
+     * <p>
+     * In 1.21.5 and up lists can be heterogeneous, here the type is only used to convert elements added with {@link NbtList#addClosest(Object)}
      * @param type - type of each element.
+     * @deprecated since 1.21.5 lists can be heterogeneous
      */
+    @Deprecated
     void setElementType(NbtType type);
     
     /**
@@ -41,9 +45,19 @@ public interface NbtList<TType> extends NbtBase<List<NbtBase<TType>>>, Iterable<
      * <p>
      * Note that the list must be typed by setting {@link #setElementType(NbtType)} before calling this function.
      * @param value - the value to add.
+     * @deprecated since 1.21.5 lists can be heterogeneous. Use {@link NbtList#addClosest(Object, NbtType)}
      */
+    @Deprecated
     void addClosest(Object value);
-    
+
+    /**
+     * Add a value to a typed list by attempting to convert it to the nearest value.
+     * <p>
+     * @param value - the value to add.
+     * @param type - the resulting type of the entry
+     */
+    void addClosest(Object value, NbtType type);
+
     /**
      * Add a NBT list or NBT compound to the list.
      * @param element Element to add

src/main/java/com/comphenix/protocol/wrappers/nbt/TileEntityAccessor.java

@@ -1,29 +1,27 @@
 package com.comphenix.protocol.wrappers.nbt;
 
+import java.io.IOException;
+import java.lang.reflect.Modifier;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.bukkit.block.BlockState;
+
 import com.comphenix.protocol.injector.BukkitUnwrapper;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.accessors.Accessors;
 import com.comphenix.protocol.reflect.accessors.FieldAccessor;
 import com.comphenix.protocol.reflect.accessors.MethodAccessor;
 import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
-import com.comphenix.protocol.utility.ByteBuddyFactory;
-import com.comphenix.protocol.utility.MinecraftMethods;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.MinecraftRegistryAccess;
 import com.comphenix.protocol.utility.MinecraftVersion;
-import java.io.IOException;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.Modifier;
-import java.util.HashMap;
-import java.util.Map;
-import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
-import net.bytebuddy.implementation.InvocationHandlerAdapter;
+
 import net.bytebuddy.jar.asm.ClassReader;
 import net.bytebuddy.jar.asm.ClassVisitor;
 import net.bytebuddy.jar.asm.MethodVisitor;
 import net.bytebuddy.jar.asm.Opcodes;
 import net.bytebuddy.jar.asm.Type;
-import net.bytebuddy.matcher.ElementMatchers;
-import org.bukkit.block.BlockState;
 
 /**
  * Manipulate tile entities.
@@ -34,6 +32,10 @@ class TileEntityAccessor<T extends BlockState> {
 
     private static final boolean BLOCK_DATA_INCL = MinecraftVersion.NETHER_UPDATE.atOrAbove()
             && !MinecraftVersion.CAVES_CLIFFS_1.atOrAbove();
+    private static final boolean USE_HOLDER_LOOKUP = MinecraftVersion.v1_21_5.atOrAbove();
+    private static final boolean USE_TAG_VALUE_INPUT = MinecraftVersion.v1_21_6.atOrAbove();
+
+    private static final Class<?> TAG_VALUE_INPUT = MinecraftReflection.getNullableNMS("world.level.storage.TagValueInput");
 
     /**
      * Token indicating that the given block state doesn't contain any tile entities.
@@ -45,7 +47,7 @@ class TileEntityAccessor<T extends BlockState> {
      */
     private static final Map<Class<?>, TileEntityAccessor<?>> cachedAccessors = new HashMap<>();
 
-    private static Constructor<?> nbtCompoundParserConstructor;
+    private MethodAccessor createInputWrapper;
 
     private FieldAccessor tileEntityField;
     private MethodAccessor readCompound;
@@ -104,11 +106,50 @@ class TileEntityAccessor<T extends BlockState> {
     }
 
     void findMethods(Class<?> type, T state) {
-        if (BLOCK_DATA_INCL) {
-            Class<?> tileEntityClass = MinecraftReflection.getTileEntityClass();
-            Class<?> iBlockData = MinecraftReflection.getIBlockDataClass();
-            Class<?> nbtCompound = MinecraftReflection.getNBTCompoundClass();
+        Class<?> tileEntityClass = MinecraftReflection.getTileEntityClass();
+        Class<?> nbtCompound = MinecraftReflection.getNBTCompoundClass();
+        
+        if (USE_HOLDER_LOOKUP) {
+            Class<?> holderLookup = MinecraftReflection.getHolderLookupProviderClass();
 
+            FuzzyReflection fuzzy = FuzzyReflection.fromClass(tileEntityClass, false);
+            // should be equiv. to `CompoundTag saveWithFullMetadata(HolderLookup.Provider)`
+            writeCompound = Accessors.getMethodAccessor(fuzzy.getMethod(
+                    FuzzyMethodContract.newBuilder()
+                            .banModifier(Modifier.STATIC)
+                            .requireModifier(Modifier.FINAL)
+                            .returnTypeExact(nbtCompound)
+                            .parameterExactArray(holderLookup)
+                            .build()));
+
+            if (USE_TAG_VALUE_INPUT) {
+                createInputWrapper = Accessors.getMethodAccessor(FuzzyReflection.fromClass(TAG_VALUE_INPUT).getMethod(
+                        FuzzyMethodContract.newBuilder()
+                                .requireModifier(Modifier.STATIC)
+                                .parameterExactArray(MinecraftReflection.getMinecraftClass("util.ProblemReporter"), holderLookup, nbtCompound)
+                                .build()));
+
+                // should be equiv. to `void loadWithComponents(ValueInput)`
+                readCompound = Accessors.getMethodAccessor(fuzzy.getMethod(
+                        FuzzyMethodContract.newBuilder()
+                                .banModifier(Modifier.STATIC)
+                                .requireModifier(Modifier.FINAL)
+                                .returnTypeVoid()
+                                .parameterSuperOf(TAG_VALUE_INPUT)
+                                .build()));
+            } else {
+                // should be equiv. to `void loadWithComponents(CompoundTag, HolderLookup.Provider)`
+                readCompound = Accessors.getMethodAccessor(fuzzy.getMethod(
+                        FuzzyMethodContract.newBuilder()
+                                .banModifier(Modifier.STATIC)
+                                .requireModifier(Modifier.FINAL)
+                                .returnTypeVoid()
+                                .parameterExactArray(nbtCompound, holderLookup)
+                                .build()));
+            }
+        } else if (BLOCK_DATA_INCL) {
+            Class<?> iBlockData = MinecraftReflection.getIBlockDataClass();
+            
             FuzzyReflection fuzzy = FuzzyReflection.fromClass(tileEntityClass, false);
             writeCompound = Accessors.getMethodAccessor(fuzzy.getMethod(
                     FuzzyMethodContract.newBuilder()
@@ -214,12 +255,17 @@ class TileEntityAccessor<T extends BlockState> {
      * @return The compound.
      */
     public NbtCompound readBlockState(T state) {
-        NbtCompound output = NbtFactory.ofCompound("");
         Object tileEntity = tileEntityField.get(state);
 
         // Write the block state to the output compound
-        writeCompound.invoke(tileEntity, NbtFactory.fromBase(output).getHandle());
-        return output;
+        if (USE_HOLDER_LOOKUP) {
+            Object tag = writeCompound.invoke(tileEntity, MinecraftRegistryAccess.get());
+            return new WrappedCompound(tag);
+        } else {
+            NbtCompound output = NbtFactory.ofCompound("");
+            writeCompound.invoke(tileEntity, NbtFactory.fromBase(output).getHandle());
+            return output;
+        }
     }
 
     /**
@@ -232,7 +278,14 @@ class TileEntityAccessor<T extends BlockState> {
         Object tileEntity = tileEntityField.get(state);
 
         // Ensure the block state is set to the compound
-        if (BLOCK_DATA_INCL) {
+        if (USE_HOLDER_LOOKUP) {
+            if (USE_TAG_VALUE_INPUT) {
+                Object tagValueInput = createInputWrapper.invoke(null, null,  MinecraftRegistryAccess.get(), NbtFactory.fromBase(compound).getHandle());
+                readCompound.invoke(tileEntity, tagValueInput);
+            } else {
+                readCompound.invoke(tileEntity, NbtFactory.fromBase(compound).getHandle(), MinecraftRegistryAccess.get());
+            }
+        } else if (BLOCK_DATA_INCL) {
             Object blockData = BukkitUnwrapper.getInstance().unwrapItem(state);
             readCompound.invoke(tileEntity, blockData, NbtFactory.fromBase(compound).getHandle());
         } else {

src/main/java/com/comphenix/protocol/wrappers/nbt/WrappedList.java

@@ -17,6 +17,7 @@
 
 package com.comphenix.protocol.wrappers.nbt;
 
+import com.comphenix.protocol.utility.MinecraftVersion;
 import com.comphenix.protocol.wrappers.collection.ConvertedList;
 import com.comphenix.protocol.wrappers.nbt.io.NbtBinarySerializer;
 import com.google.common.base.Joiner;
@@ -103,7 +104,9 @@ class WrappedList<TType> implements NbtWrapper<List<NbtBase<TType>>>, NbtList<TT
      */
     public WrappedList(Object handle) {
         this.container = new WrappedElement<>(handle);
-        this.elementType = container.getSubType();
+        if (!MinecraftVersion.v1_21_5.atOrAbove()) {
+            this.elementType = container.getSubType();
+        }
     }
     
     /**
@@ -113,7 +116,9 @@ class WrappedList<TType> implements NbtWrapper<List<NbtBase<TType>>>, NbtList<TT
      */
     public WrappedList(Object handle, String name) {
         this.container = new WrappedElement<>(handle, name);
-        this.elementType = container.getSubType();
+        if (!MinecraftVersion.v1_21_5.atOrAbove()) {
+            this.elementType = container.getSubType();
+        }
     }
 
     @Override
@@ -141,13 +146,28 @@ class WrappedList<TType> implements NbtWrapper<List<NbtBase<TType>>>, NbtList<TT
     
     @Override
     public NbtType getElementType() {
-        return elementType;
+        if (!MinecraftVersion.v1_21_5.atOrAbove()) {
+            return elementType;
+        } else {
+            List<NbtBase<TType>> value = getValue();
+            NbtType type = NbtType.TAG_END;
+            for (NbtBase<TType> entry : value) {
+                if (type == NbtType.TAG_END) {
+                    type = entry.getType();
+                } else if (type != entry.getType()) {
+                    return NbtType.TAG_COMPOUND;
+                }
+            }
+            return type;
+        }
     }
     
     @Override
     public void setElementType(NbtType type) {
         this.elementType = type;
-        container.setSubType(type);
+        if (!MinecraftVersion.v1_21_5.atOrAbove()) {
+            container.setSubType(type);
+        }
     }
 
     @Override
@@ -171,14 +191,16 @@ class WrappedList<TType> implements NbtWrapper<List<NbtBase<TType>>>, NbtList<TT
                     if (!element.getName().equals(EMPTY_NAME))
                         throw new IllegalArgumentException("Cannot add a the named NBT tag " + element + " to a list.");
                     
-                    // Check element type
-                    if (getElementType() != NbtType.TAG_END) {
-                        if (!element.getType().equals(getElementType())) {
-                            throw new IllegalArgumentException(
-                                    "Cannot add " + element + " of " + element.getType() + " to a list of type " + getElementType());
+                    if (!MinecraftVersion.v1_21_5.atOrAbove()) {
+                        // Check element type
+                        if (getElementType() != NbtType.TAG_END) {
+                            if (!element.getType().equals(getElementType())) {
+                                throw new IllegalArgumentException(
+                                        "Cannot add " + element + " of " + element.getType() + " to a list of type " + getElementType());
+                            }
+                        } else {
+                            container.setSubType(element.getType());
                         }
-                    } else {
-                        container.setSubType(element.getType());
                     }
                 }
                 
@@ -235,16 +257,21 @@ class WrappedList<TType> implements NbtWrapper<List<NbtBase<TType>>>, NbtList<TT
     }
     
     @Override
-    @SuppressWarnings("unchecked")
     public void addClosest(Object value) {
-        if (getElementType() == NbtType.TAG_END)
+        if (elementType == NbtType.TAG_END)
             throw new IllegalStateException("This list has not been typed yet.");
-        
+
+        addClosest(value, elementType);
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public void addClosest(Object value, NbtType type) {
         if (value instanceof Number) {
             Number number = (Number) value;
             
             // Convert the number
-            switch (getElementType()) {
+            switch (type) {
                 case TAG_BYTE: add(number.byteValue()); break;
                 case TAG_SHORT: add(number.shortValue()); break;
                 case TAG_INT: add(number.intValue()); break;
@@ -262,7 +289,7 @@ class WrappedList<TType> implements NbtWrapper<List<NbtBase<TType>>>, NbtList<TT
             
         } else {
             // Just add it
-            add((NbtBase<TType>) NbtFactory.ofWrapper(getElementType(), EMPTY_NAME, value));
+            add((NbtBase<TType>) NbtFactory.ofWrapper(type, EMPTY_NAME, value));
         }
     }
     
@@ -355,7 +382,7 @@ class WrappedList<TType> implements NbtWrapper<List<NbtBase<TType>>>, NbtList<TT
         }
         
         // Update the sub type as well
-        if (lastElement != null) {
+        if (lastElement != null && !MinecraftVersion.v1_21_5.atOrAbove()) {
             container.setSubType(lastElement.getType());
         }
     }

src/main/java/com/comphenix/protocol/wrappers/nbt/io/NbtConfigurationSerializer.java

@@ -261,10 +261,9 @@ public class NbtConfigurationSerializer {
 
             if (node instanceof List) {
                 NbtList<Object> list = NbtFactory.ofList(decoded[0]);
-                list.setElementType(type);
                 
                 for (Object value : (List<Object>) node) {
-                    list.addClosest(toNodeValue(value, type));
+                    list.addClosest(toNodeValue(value, type), type);
                 }
                 
                 // Add the list

src/main/java/com/comphenix/protocol/wrappers/nbt/io/NbtTextSerializer.java

@@ -5,8 +5,7 @@ import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
-
-import org.yaml.snakeyaml.external.biz.base64Coder.Base64Coder;
+import java.util.Base64;
 
 import com.comphenix.protocol.wrappers.nbt.NbtBase;
 import com.comphenix.protocol.wrappers.nbt.NbtCompound;
@@ -23,7 +22,7 @@ public class NbtTextSerializer {
      * A default instance of this serializer.
      */
     public static final NbtTextSerializer DEFAULT = new NbtTextSerializer();
-    
+
     private NbtBinarySerializer binarySerializer;
     
     public NbtTextSerializer() {
@@ -59,7 +58,7 @@ public class NbtTextSerializer {
          binarySerializer.serialize(value, dataOutput);
          
          // Serialize that array
-         return Base64Coder.encodeLines(outputStream.toByteArray());
+         return Base64.getEncoder().encodeToString(outputStream.toByteArray());
     }
     
     /**
@@ -70,7 +69,7 @@ public class NbtTextSerializer {
      * @throws IOException If we are unable to parse the input.
      */
     public <TType> NbtWrapper<TType> deserialize(String input) throws IOException {
-        ByteArrayInputStream inputStream = new ByteArrayInputStream(Base64Coder.decodeLines(input));
+        ByteArrayInputStream inputStream = new ByteArrayInputStream(Base64.getDecoder().decode(input));
         
         return binarySerializer.deserialize(new DataInputStream(inputStream));
     }

src/main/java/com/comphenix/protocol/wrappers/ping/ServerPingRecord.java

@@ -7,6 +7,8 @@ import com.comphenix.protocol.reflect.accessors.Accessors;
 import com.comphenix.protocol.reflect.accessors.ConstructorAccessor;
 import com.comphenix.protocol.reflect.accessors.FieldAccessor;
 import com.comphenix.protocol.reflect.accessors.MethodAccessor;
+import com.comphenix.protocol.reflect.instances.DefaultInstances;
+import com.comphenix.protocol.reflect.instances.MinecraftGenerator;
 import com.comphenix.protocol.utility.MinecraftProtocolVersion;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.utility.MinecraftVersion;
@@ -23,6 +25,7 @@ public final class ServerPingRecord implements ServerPingImpl {
     private static Class<?> SERVER_PING;
     private static Class<?> PLAYER_SAMPLE_CLASS;
     private static Class<?> SERVER_DATA_CLASS;
+    private static Class<?> NAME_AND_ID_CLASS;
 
     private static Class<?> GSON_CLASS;
     private static MethodAccessor GSON_TO_JSON;
@@ -56,13 +59,37 @@ public final class ServerPingRecord implements ServerPingImpl {
                 PLAYER_SAMPLE_CLASS = MinecraftReflection.getServerPingPlayerSampleClass();
                 SERVER_DATA_CLASS = MinecraftReflection.getServerPingServerDataClass();
 
-                PING_CTOR = Accessors.getConstructorAccessor(SERVER_PING.getConstructors()[0]);
+                PING_CTOR = Accessors.getConstructorAccessor(SERVER_PING, MinecraftReflection.getIChatBaseComponentClass(), Optional.class, Optional.class, Optional.class, boolean.class);
 
                 DATA_WRAPPER = AutoWrapper.wrap(ServerData.class, SERVER_DATA_CLASS);
                 SAMPLE_WRAPPER = AutoWrapper.wrap(PlayerSample.class, PLAYER_SAMPLE_CLASS);
                 FAVICON_WRAPPER = AutoWrapper.wrap(Favicon.class, MinecraftReflection.getMinecraftClass("network.protocol.status.ServerPing$a", "network.protocol.status.ServerStatus$Favicon"));
 
-                PROFILE_LIST_CONVERTER = BukkitConverters.getListConverter(BukkitConverters.getWrappedGameProfileConverter());
+                if (MinecraftVersion.v1_21_10.atOrAbove()) {
+                    NAME_AND_ID_CLASS = MinecraftReflection.getMinecraftClass("server.players.NameAndId");
+                    NAME_AND_ID_WRAPPER = AutoWrapper.wrap(NameAndId.class, NAME_AND_ID_CLASS);
+
+                    PROFILE_LIST_CONVERTER = BukkitConverters.getListConverter(new EquivalentConverter<>() {
+                        @Override
+                        public Object getGeneric(WrappedGameProfile specific) {
+                            NameAndId wrapper = new NameAndId(specific.getUUID(), specific.getName());
+                            return NAME_AND_ID_WRAPPER.getGeneric(wrapper);
+                        }
+
+                        @Override
+                        public WrappedGameProfile getSpecific(Object generic) {
+                            NameAndId wrapper = NAME_AND_ID_WRAPPER.getSpecific(generic);
+                            return new WrappedGameProfile(wrapper.id, wrapper.name);
+                        }
+
+                        @Override
+                        public Class<WrappedGameProfile> getSpecificType() {
+                            return WrappedGameProfile.class;
+                        }
+                    });
+                } else {
+                    PROFILE_LIST_CONVERTER = BukkitConverters.getListConverter(BukkitConverters.getWrappedGameProfileConverter());
+                }
 
                 DEFAULT_DESCRIPTION = WrappedChatComponent.fromLegacyText("A Minecraft Server");
 
@@ -124,11 +151,24 @@ public final class ServerPingRecord implements ServerPingImpl {
         }
     }
 
+    public static final class NameAndId {
+        public UUID id;
+        public String name;
+
+        public NameAndId(UUID id, String name) {
+            this.id = id;
+            this.name = name;
+        }
+
+        public NameAndId() {
+            this(MinecraftGenerator.SYS_UUID, "");
+        }
+    }
+
     private static AutoWrapper<PlayerSample> SAMPLE_WRAPPER;
-
     private static AutoWrapper<ServerData> DATA_WRAPPER;
-
     private static AutoWrapper<Favicon> FAVICON_WRAPPER;
+    private static AutoWrapper<NameAndId> NAME_AND_ID_WRAPPER;
 
     private WrappedChatComponent description;
     private PlayerSample playerSample;

src/test/java/com/comphenix/integration/protocol/SimpleCraftBukkitITCase.java

@@ -1,8 +1,16 @@
 package com.comphenix.integration.protocol;
 
+import java.io.File;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
 import com.comphenix.protocol.ProtocolLibrary;
 import com.comphenix.protocol.reflect.ExactReflection;
 import com.comphenix.protocol.reflect.accessors.Accessors;
+
 import com.google.common.collect.Lists;
 import com.google.common.io.Files;
 import org.apache.logging.log4j.Logger;
@@ -13,13 +21,6 @@ import org.bukkit.plugin.PluginDescriptionFile;
 import org.bukkit.plugin.PluginLoadOrder;
 import org.bukkit.plugin.PluginManager;
 
-import java.io.File;
-import java.io.IOException;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.concurrent.TimeUnit;
-
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 

src/test/java/com/comphenix/integration/protocol/SimpleMinecraftClient.java

@@ -1,10 +1,5 @@
 package com.comphenix.integration.protocol;
 
-import com.comphenix.protocol.PacketType;
-import com.comphenix.protocol.PacketType.Protocol;
-import com.comphenix.protocol.PacketType.Sender;
-import com.comphenix.protocol.utility.StreamSerializer;
-import com.google.common.io.ByteStreams;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
@@ -15,6 +10,13 @@ import java.io.OutputStream;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.PacketType.Protocol;
+import com.comphenix.protocol.PacketType.Sender;
+import com.comphenix.protocol.utility.StreamSerializer;
+
+import com.google.common.io.ByteStreams;
+
 public class SimpleMinecraftClient {
 
     private static final int CONNECT_TIMEOUT = 2500;

src/test/java/com/comphenix/integration/protocol/TestPingPacket.java

@@ -1,17 +1,18 @@
 package com.comphenix.integration.protocol;
 
-import com.comphenix.protocol.PacketType;
-import com.comphenix.protocol.ProtocolLibrary;
-import com.comphenix.protocol.events.PacketAdapter;
-import com.comphenix.protocol.events.PacketEvent;
-import org.bukkit.plugin.Plugin;
-
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketEvent;
+
+import org.bukkit.plugin.Plugin;
+
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class TestPingPacket {

src/test/java/com/comphenix/protocol/BukkitInitialization.java

@@ -3,60 +3,70 @@ package com.comphenix.protocol;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
-import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.reflect.accessors.ConstructorAccessor;
 import com.comphenix.protocol.reflect.accessors.FieldAccessor;
 import com.comphenix.protocol.utility.MinecraftReflectionTestUtil;
 
 import com.google.common.base.Preconditions;
 import com.google.common.util.concurrent.MoreExecutors;
+import io.papermc.paper.configuration.GlobalConfiguration;
+import io.papermc.paper.configuration.WorldConfiguration;
+import io.papermc.paper.registry.PaperRegistryAccess;
+import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap;
 import net.minecraft.SharedConstants;
-import net.minecraft.commands.CommandDispatcher;
-import net.minecraft.core.IRegistry;
-import net.minecraft.core.IRegistryCustom;
+import net.minecraft.commands.Commands;
+import net.minecraft.core.HolderLookup;
 import net.minecraft.core.LayeredRegistryAccess;
+import net.minecraft.core.RegistryAccess;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.core.registries.Registries;
-import net.minecraft.resources.MinecraftKey;
 import net.minecraft.resources.RegistryDataLoader;
-import net.minecraft.server.DataPackResources;
-import net.minecraft.server.DispenserRegistry;
+import net.minecraft.resources.Identifier;
+import net.minecraft.server.Bootstrap;
+import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.RegistryLayer;
-import net.minecraft.server.WorldLoader;
+import net.minecraft.server.ReloadableServerResources;
 import net.minecraft.server.dedicated.DedicatedServer;
-import net.minecraft.server.level.WorldServer;
-import net.minecraft.server.packs.EnumResourcePackType;
-import net.minecraft.server.packs.repository.ResourcePackLoader;
-import net.minecraft.server.packs.repository.ResourcePackRepository;
-import net.minecraft.server.packs.repository.ResourcePackSourceVanilla;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.packs.PackType;
+import net.minecraft.server.packs.repository.PackRepository;
+import net.minecraft.server.packs.repository.ServerPacksSource;
+import net.minecraft.server.packs.resources.MultiPackResourceManager;
 import net.minecraft.server.packs.resources.ResourceManager;
+import net.minecraft.server.permissions.LevelBasedPermissionSet;
+import net.minecraft.server.permissions.PermissionSet;
 import net.minecraft.tags.TagKey;
-import net.minecraft.world.entity.EntityTypes;
+import net.minecraft.tags.TagLoader;
+import net.minecraft.util.Util;
+import net.minecraft.world.entity.EntityType;
 import net.minecraft.world.flag.FeatureFlags;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.enchantment.Enchantments;
+import net.minecraft.world.level.DataPackConfig;
+import net.minecraft.world.level.WorldDataConfiguration;
 import net.minecraft.world.level.block.Block;
-import net.minecraft.world.level.material.FluidType;
+import net.minecraft.world.level.material.Fluid;
 import org.apache.logging.log4j.LogManager;
 import org.bukkit.Bukkit;
 import org.bukkit.Keyed;
 import org.bukkit.NamespacedKey;
 import org.bukkit.Registry;
 import org.bukkit.World;
-import org.bukkit.craftbukkit.v1_21_R1.CraftLootTable;
-import org.bukkit.craftbukkit.v1_21_R1.CraftRegistry;
-import org.bukkit.craftbukkit.v1_21_R1.CraftServer;
-import org.bukkit.craftbukkit.v1_21_R1.CraftWorld;
-import org.bukkit.craftbukkit.v1_21_R1.inventory.CraftItemFactory;
-import org.bukkit.craftbukkit.v1_21_R1.tag.CraftBlockTag;
-import org.bukkit.craftbukkit.v1_21_R1.tag.CraftEntityTag;
-import org.bukkit.craftbukkit.v1_21_R1.tag.CraftFluidTag;
-import org.bukkit.craftbukkit.v1_21_R1.tag.CraftItemTag;
-import org.bukkit.craftbukkit.v1_21_R1.util.CraftMagicNumbers;
-import org.bukkit.craftbukkit.v1_21_R1.util.CraftNamespacedKey;
-import org.bukkit.craftbukkit.v1_21_R1.util.Versioning;
+import org.bukkit.craftbukkit.CraftLootTable;
+import org.bukkit.craftbukkit.CraftRegistry;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.inventory.CraftItemFactory;
+import org.bukkit.craftbukkit.tag.CraftBlockTag;
+import org.bukkit.craftbukkit.tag.CraftEntityTag;
+import org.bukkit.craftbukkit.tag.CraftFluidTag;
+import org.bukkit.craftbukkit.tag.CraftItemTag;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.craftbukkit.util.CraftNamespacedKey;
+import org.bukkit.craftbukkit.util.Versioning;
 import org.jetbrains.annotations.NotNull;
 import org.spigotmc.SpigotWorldConfig;
 
@@ -75,6 +85,15 @@ public class BukkitInitialization {
     private boolean initialized;
     private boolean packaged;
 
+    private static ServerLevel mockServerLevel;
+
+    /**
+     * @return the mocked NMS server level set up during initialization, usable as a Level for constructing test entities
+     */
+    public static ServerLevel getMockServerLevel() {
+        return mockServerLevel;
+    }
+
     private BukkitInitialization() {
         System.out.println("Created new BukkitInitialization on " + Thread.currentThread().getName());
     }
@@ -111,36 +130,89 @@ public class BukkitInitialization {
             instance.setPackage();
 
             // Minecraft Data Init
-            SharedConstants.a(); // .tryDetectVersion()
-            DispenserRegistry.a(); // .bootStrap()
+            SharedConstants.tryDetectVersion(); // .tryDetectVersion()
+            Bootstrap.bootStrap(); // .bootStrap()
+            Bootstrap.validate();
 
-            ResourcePackRepository resourcePackRepository = ResourcePackSourceVanilla.c(); // .createVanillaTrustedRepository()
-            resourcePackRepository.a(); // .reload()
+            PackRepository repo = ServerPacksSource.createVanillaTrustedRepository();
+            MinecraftServer.configurePackRepository(
+                    repo,
+                    new WorldDataConfiguration(
+                            new DataPackConfig(
+                                    FeatureFlags.REGISTRY.toNames(FeatureFlags.REGISTRY.allFlags())
+                                            .stream()
+                                            .map(Identifier::getPath)
+                                            .toList(),
+                                    List.of()),
+                            FeatureFlags.REGISTRY.allFlags()),
+                    true,
+                    false);
 
-            ResourceManager resourceManager = new ResourceManager(
-                    EnumResourcePackType.b /* SERVER_DATA */,
-                    resourcePackRepository.c() /* getAvailablePacks() */ .stream().map(ResourcePackLoader::f /* openFull() */).collect(Collectors.toList()));
-            LayeredRegistryAccess<RegistryLayer> layeredRegistryAccess = RegistryLayer.a(); // .createRegistryAccess()
-            layeredRegistryAccess = WorldLoader.b(resourceManager, layeredRegistryAccess, RegistryLayer.b /* WORLDGEN */, RegistryDataLoader.a /* WORLDGEN_REGISTRIES */); // .loadAndReplaceLayer()
-            IRegistryCustom.Dimension registryCustom = layeredRegistryAccess.a().d(); // .compositeAccess().freeze()
-            // IRegistryCustom.Dimension registryCustom = layeredRegistryAccess.a().c(); // .compositeAccess().freeze()
+            ResourceManager resourceManager = new MultiPackResourceManager(
+                PackType.SERVER_DATA,
+                repo.openAllSelected()
+            );
 
-            DataPackResources dataPackResources = DataPackResources.a(
-                    resourceManager,
-                    layeredRegistryAccess,
-                    FeatureFlags.d.a() /* REGISTRY.allFlags() */,
-                    CommandDispatcher.ServerType.b /* DEDICATED */,
-                    0,
-                    MoreExecutors.directExecutor(),
-                    MoreExecutors.directExecutor()
-            ).join();
-            dataPackResources.g();
+            LayeredRegistryAccess<RegistryLayer> layeredAccess1 = RegistryLayer.createRegistryAccess();
+            List<net.minecraft.core.Registry.PendingTags<?>> tags = TagLoader.loadTagsForExistingRegistries(resourceManager, layeredAccess1.getLayer(RegistryLayer.STATIC));
+            RegistryAccess.Frozen access1 = layeredAccess1.getAccessForLoading(RegistryLayer.WORLD);
+            List<HolderLookup.RegistryLookup<?>> list1 = TagLoader.buildUpdatedLookups(access1, tags);
+
+            RegistryAccess.Frozen access2;
 
             try {
+                access2 = RegistryDataLoader.load(
+                        resourceManager,
+                        list1,
+                        RegistryDataLoader.WORLD_REGISTRIES,
+                        Util.backgroundExecutor()).get();
+            } catch (Exception ex) {
+                throw new RuntimeException(ex);
+            }
+
+            LayeredRegistryAccess<RegistryLayer> layeredAccess2 =
+                    layeredAccess1.replaceFrom(RegistryLayer.WORLD, access2);
+            List<HolderLookup.RegistryLookup<?>> dimensionLookups =
+                    Stream.concat(list1.stream(), access2.listRegistries()).toList();
+            RegistryAccess.Frozen dimensions = RegistryDataLoader.load(
+                    resourceManager,
+                    dimensionLookups,
+                    RegistryDataLoader.DIMENSION_REGISTRIES,
+                    Util.backgroundExecutor()).join();
+            layeredAccess2 = layeredAccess2.replaceFrom(RegistryLayer.DIMENSIONS, dimensions);
+
+            try {
+                Class.forName(Registry.class.getName());
+            } catch (ClassNotFoundException exception) {
+                throw new RuntimeException(exception);
+            }
+
+            RegistryAccess.Frozen registryCustom = layeredAccess2.compositeAccess().freeze();
+            PaperRegistryAccess paperRegistryAccess = PaperRegistryAccess.instance();
+            GlobalConfiguration globalConfiguration = new GlobalConfiguration();
+            globalConfiguration.collisions = globalConfiguration.new Collisions();
+            Accessors.getMethodAccessor(
+                    GlobalConfiguration.class,
+                    "set",
+                    GlobalConfiguration.class).invoke(null, globalConfiguration);
+
+            ReloadableServerResources dataPackResources = ReloadableServerResources.loadResources(
+                resourceManager,
+                layeredAccess2,
+                tags,
+                FeatureFlags.REGISTRY.allFlags() /* REGISTRY.allFlags() */,
+                Commands.CommandSelection.DEDICATED /* DEDICATED */,
+                LevelBasedPermissionSet.ALL,
+                MoreExecutors.directExecutor(),
+                MoreExecutors.directExecutor()
+            ).join();
+            dataPackResources.updateComponentsAndStaticRegistryTags();
+
+            /* try {
                 IRegistry.class.getName();
             } catch (Throwable ex) {
                 ex.printStackTrace();
-            }
+            } */
 
             String releaseTarget = MinecraftReflectionTestUtil.RELEASE_TARGET;
             String serverVersion = CraftServer.class.getPackage().getImplementationVersion();
@@ -149,7 +221,14 @@ public class BukkitInitialization {
             CraftServer mockedServer = mock(CraftServer.class);
             DedicatedServer mockedGameServer = mock(DedicatedServer.class);
 
-            when(mockedGameServer.bc()/*registryAccess*/).thenReturn(registryCustom);
+            when(mockedGameServer.registryAccess()).thenReturn(registryCustom);
+            try {
+                FieldAccessor serverInstance = Accessors.getFieldAccessor(
+                        MinecraftServer.class.getDeclaredField("SERVER"));
+                serverInstance.set(null, mockedGameServer);
+            } catch (NoSuchFieldException exception) {
+                throw new RuntimeException(exception);
+            }
 
             when(mockedServer.getLogger()).thenReturn(java.util.logging.Logger.getLogger("Minecraft"));
             when(mockedServer.getName()).thenReturn("Mock Server");
@@ -162,11 +241,11 @@ public class BukkitInitialization {
             when(mockedServer.getUnsafe()).thenReturn(CraftMagicNumbers.INSTANCE);
             when(mockedServer.getLootTable(any())).thenAnswer(invocation -> {
                 NamespacedKey key = invocation.getArgument(0);
-                return new CraftLootTable(key, dataPackResources.b().b(CraftLootTable.bukkitKeyToMinecraft(key)));
+                return new CraftLootTable(key, dataPackResources.fullRegistries().getLootTable(CraftLootTable.bukkitKeyToMinecraft(key)));
             });
             when(mockedServer.getRegistry(any())).thenAnswer(invocation -> {
                 Class<Keyed> registryType = invocation.getArgument(0);
-                Object registry = CraftRegistry.createRegistry(registryType, registryCustom);
+                Object registry = paperRegistryAccess.getRegistry(registryType);
 
                 if (registry == null) {
                     System.err.println("WARN: Missing registry for " + registryType);
@@ -179,35 +258,35 @@ public class BukkitInitialization {
             when(mockedServer.getTag(any(), any(), any())).then(mock -> {
                 String registry = mock.getArgument(0);
                 Class<?> clazz = mock.getArgument(2);
-                MinecraftKey key = CraftNamespacedKey.toMinecraft(mock.getArgument(1));
+                Identifier key = CraftNamespacedKey.toMinecraft(mock.getArgument(1));
 
                 switch (registry) {
                     case org.bukkit.Tag.REGISTRY_BLOCKS -> {
                         Preconditions.checkArgument(clazz == org.bukkit.Material.class, "Block namespace must have block type");
-                        TagKey<Block> blockTagKey = TagKey.a(Registries.f, key);
-                        if (BuiltInRegistries.e.b(blockTagKey).isPresent()) {
-                            return new CraftBlockTag(BuiltInRegistries.e, blockTagKey);
+                        TagKey<Block> blockTagKey = TagKey.create(Registries.BLOCK, key);
+                        if (BuiltInRegistries.BLOCK.get(blockTagKey).isPresent()) {
+                            return new CraftBlockTag(BuiltInRegistries.BLOCK, blockTagKey);
                         }
                     }
                     case org.bukkit.Tag.REGISTRY_ITEMS -> {
                         Preconditions.checkArgument(clazz == org.bukkit.Material.class, "Item namespace must have item type");
-                        TagKey<Item> itemTagKey = TagKey.a(Registries.K, key);
-                        if (BuiltInRegistries.g.b(itemTagKey).isPresent()) {
-                            return new CraftItemTag(BuiltInRegistries.g, itemTagKey);
+                        TagKey<Item> itemTagKey = TagKey.create(Registries.ITEM, key);
+                        if (BuiltInRegistries.ITEM.get(itemTagKey).isPresent()) {
+                            return new CraftItemTag(BuiltInRegistries.ITEM, itemTagKey);
                         }
                     }
                     case org.bukkit.Tag.REGISTRY_FLUIDS -> {
                         Preconditions.checkArgument(clazz == org.bukkit.Fluid.class, "Fluid namespace must have fluid type");
-                        TagKey<FluidType> fluidTagKey = TagKey.a(Registries.D, key);
-                        if (BuiltInRegistries.c.b(fluidTagKey).isPresent()) {
-                            return new CraftFluidTag(BuiltInRegistries.c, fluidTagKey);
+                        TagKey<Fluid> fluidTagKey = TagKey.create(Registries.FLUID, key);
+                        if (BuiltInRegistries.FLUID.get(fluidTagKey).isPresent()) {
+                            return new CraftFluidTag(BuiltInRegistries.FLUID, fluidTagKey);
                         }
                     }
                     case org.bukkit.Tag.REGISTRY_ENTITY_TYPES -> {
                         Preconditions.checkArgument(clazz == org.bukkit.entity.EntityType.class, "Entity type namespace must have entity type");
-                        TagKey<EntityTypes<?>> entityTagKey = TagKey.a(Registries.z, key);
-                        if (BuiltInRegistries.f.b(entityTagKey).isPresent()) {
-                            return new CraftEntityTag(BuiltInRegistries.f, entityTagKey);
+                        TagKey<EntityType<?>> entityTagKey = TagKey.create(Registries.ENTITY_TYPE, key);
+                        if (BuiltInRegistries.ENTITY_TYPE.get(entityTagKey).isPresent()) {
+                            return new CraftEntityTag(BuiltInRegistries.ENTITY_TYPE, entityTagKey);
                         }
                     }
                     default -> throw new IllegalArgumentException();
@@ -216,8 +295,20 @@ public class BukkitInitialization {
                 return null;
             });
 
-            WorldServer nmsWorld = mock(WorldServer.class);
+            ServerLevel nmsWorld = mock(ServerLevel.class);
             SpigotWorldConfig mockWorldConfig = mock(SpigotWorldConfig.class);
+            ConstructorAccessor worldConfigurationConstructor = Accessors.getConstructorAccessor(
+                    WorldConfiguration.class,
+                    SpigotWorldConfig.class,
+                    Identifier.class);
+            WorldConfiguration worldConfiguration = (WorldConfiguration) worldConfigurationConstructor.invoke(
+                    mockWorldConfig,
+                    Identifier.parse("minecraft:test"));
+            worldConfiguration.entities = worldConfiguration.new Entities();
+            worldConfiguration.entities.spawning =
+                    worldConfiguration.entities.new Spawning();
+            worldConfiguration.entities.spawning.despawnTime = new Reference2ObjectOpenHashMap<>();
+            when(nmsWorld.paperConfig()).thenReturn(worldConfiguration);
 
             try {
                 FieldAccessor spigotConfig = Accessors.getFieldAccessor(nmsWorld.getClass().getField("spigotConfig"));
@@ -228,6 +319,7 @@ public class BukkitInitialization {
 
             CraftWorld world = mock(CraftWorld.class);
             when(world.getHandle()).thenReturn(nmsWorld);
+            mockServerLevel = nmsWorld;
 
             List<World> worlds = Collections.singletonList(world);
             when(mockedServer.getWorlds()).thenReturn(worlds);
@@ -237,8 +329,7 @@ public class BukkitInitialization {
             CraftRegistry.setMinecraftRegistry(registryCustom);
 
             // Init Enchantments
-            Enchantments.A.getClass();
-            // Enchantment.stopAcceptingRegistrations();
+            Enchantments.AQUA_AFFINITY.getClass();
 
             initialized = true;
         }
@@ -284,5 +375,35 @@ public class BukkitInitialization {
             List<T> empty = Collections.emptyList();
             return empty.stream();
         }
+
+        @Override
+        public Stream<NamespacedKey> keyStream() {
+            return Stream.empty();
+        }
+
+        @Override
+        public NamespacedKey getKey(T value) {
+            return null;
+        }
+
+        @Override
+        public boolean hasTag(io.papermc.paper.registry.tag.TagKey<T> key) {
+            return false;
+        }
+
+        @Override
+        public io.papermc.paper.registry.tag.Tag<T> getTag(io.papermc.paper.registry.tag.TagKey<T> key) {
+            return null;
+        }
+
+        @Override
+        public java.util.Collection<io.papermc.paper.registry.tag.Tag<T>> getTags() {
+            return Collections.emptyList();
+        }
+
+        @Override
+        public int size() {
+            return 0;
+        }
     }
 }

src/test/java/com/comphenix/protocol/PacketTypeTest.java

@@ -16,10 +16,13 @@ package com.comphenix.protocol;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -28,15 +31,14 @@ import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
-import com.comphenix.protocol.PacketType.Play.Server;
-import com.comphenix.protocol.PacketType.Protocol;
-import com.comphenix.protocol.PacketType.Sender;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.injector.packet.PacketRegistry;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.wrappers.WrappedChatComponent;
 
-import net.minecraft.network.protocol.login.PacketLoginInStart;
+import net.minecraft.network.protocol.common.ClientboundPostEffectsPacket;
+import net.minecraft.network.protocol.common.ClientboundStoreCookiePacket;
+import net.minecraft.network.protocol.login.ServerboundHelloPacket;
 
 /**
  * @author dmulloy2
@@ -62,7 +64,6 @@ public class PacketTypeTest {
     }
 
      public static void main(String[] args) throws Exception {
-//    public void generateNewPackets() throws Exception {
         BukkitInitialization.initializeAll();
 
         PacketType.onDynamicCreate = (type, className) -> {
@@ -257,10 +258,41 @@ public class PacketTypeTest {
         }
     }
 
+    @Test
+    public void testMinecraft263PacketMappings() {
+        assertEquals(0x25, PacketType.Play.Server.ADD_TRANSIENT_BLOCK.getCurrentId());
+        assertEquals(0x26, PacketType.Play.Server.UNLOAD_CHUNK.getCurrentId());
+        assertNotEquals(PacketType.Play.Server.ADD_TRANSIENT_BLOCK, PacketType.Play.Server.UNLOAD_CHUNK);
+
+        assertEquals(0x53, PacketType.Play.Server.POST_EFFECTS.getCurrentId());
+        assertEquals(0x7B, PacketType.Play.Server.SWING_ANIMATION.getCurrentId());
+        assertEquals(0x2E, PacketType.Play.Client.PUNCH.getCurrentId());
+        assertNotEquals(PacketType.Play.Client.PUNCH, PacketType.Play.Client.RECIPE_SETTINGS);
+    }
+
+    @Test
+    public void testMinecraft263ConfigurationPacketMappings() {
+        assertEquals(0x0A, PacketType.Configuration.Server.POST_EFFECTS.getCurrentId());
+        assertEquals(ClientboundPostEffectsPacket.class, PacketType.Configuration.Server.POST_EFFECTS.getPacketClass());
+        assertEquals(0x0B, PacketType.Configuration.Server.STORE_COOKIE.getCurrentId());
+        assertEquals(ClientboundStoreCookiePacket.class, PacketType.Configuration.Server.STORE_COOKIE.getPacketClass());
+        assertEquals(0x14, PacketType.Configuration.Server.CODE_OF_CONDUCT.getCurrentId());
+    }
+    
+    @Test
+    public void testPacketCodec() {
+        Set<PacketType> notSerializable = Set.of(PacketType.Play.Server.BUNDLE);
+        for (PacketType type : PacketType.values()) {
+            if (!notSerializable.contains(type) && type.isSupported()) {
+                assertNotNull(PacketRegistry.getStreamCodec(type.getPacketClass()), "missing serializer for " + type);
+            }
+        }
+    }
+
     @Test
     public void testLoginStart() {
         // This packet is critical for handleLoin
-        assertEquals(PacketLoginInStart.class, PacketType.Login.Client.START.getPacketClass());
+        assertEquals(ServerboundHelloPacket.class, PacketType.Login.Client.START.getPacketClass());
     }
 
     @Test