3.0.1

Load TAB after PremiumVanish

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+name: Build
+on:
+  push:
+    branches:
+      - master
+      - v3
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Cache SonarCloud packages
+        uses: actions/cache@v1
+        with:
+          path: ~/.sonar/cache
+          key: ${{ runner.os }}-sonar
+          restore-keys: ${{ runner.os }}-sonar
+      - name: Cache Gradle
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: "${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}"
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Build and analyze
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+        run: ./gradlew clean build

.gitignore

@@ -35,3 +35,9 @@ hs_err_pid*
 # other
 .gitattributes
 *.iml
+run/
+
+# Gradle
+.gradle/
+build/
+!gradle/wrapper/gradle-wrapper.jar

README.md

@@ -1,46 +1,18 @@
-## Introduction  
-Here it is. After countless requests to go opensource, I did it to make those people quiet. It worked.  
-It's already been a year and I still can't see any positives of it. This way I just made it easier for everyone to make a plugin as good, so people can stop using it and switch to something better. Or just get premium version for free.  
+# About
+This is where you can download the plugin for free without needing to buy me a coffee or just grab some code inspiration for your plugin. God bless opensource.  
   
-  
-## Compiling
-Plugin can be compiled using maven. Once you've purchased the premium version, you can enable premium features by setting [this line to return true](https://github.com/NEZNAMY/TAB/blob/master/shared/src/main/java/me/neznamy/tab/shared/TAB.java#L78) and apply your code improvements. Enabling it without purchasing the plugin may result in the features not working correctly.  
-**No support is provided for self-compiled jars, only for official compilations.** If you compiled it yourself, it is highly likely you modified something, which might be the reason why is the plugin not working. If you didn't modify anything, you can just get the plugin from official download places.
-  
-  
-## Links
-Free version  
-    Spigot (releases): https://www.spigotmc.org/resources/57806/  
-    Pre-releases https://github.com/NEZNAMY/TAB/releases  
-Premium version  
-    Polymart (releases): https://polymart.org/resource/484  
-    MC-Market (releases): https://www.mc-market.org/resources/14009/  
-    Pre-releases on discord for verified buyers  
-Bukkit bridge https://www.spigotmc.org/resources/83966/  
-Wiki https://github.com/NEZNAMY/TAB/wiki  
-Discord invite link: https://discord.gg/EaSvdk6  
-  
-  
-## Downloads
-Official release: https://www.spigotmc.org/resources/57806/  
-Pre-releases: https://github.com/NEZNAMY/TAB/releases  
-  
-  
-## Maven Repository
-```
-<repositories>
-  <repository>
-    <id>jitpack.io</id>
-    <url>https://jitpack.io</url>
-  </repository>
-</repositories>
+# Compiling from source
+Compilation requires JDK 8 and up.  
+To compile the plugin, run `./gradlew build` from the terminal.  
+Once the plugin compiles, you can grab the jar from `jar/build/libs/` folder.
 
-<dependencies>
-  <!-- TAB -->
-  <dependency>
-    <groupId>com.github.NEZNAMY</groupId>
-    <artifactId>TAB-API</artifactId>
-    <version>2.8.10</version>
-  </dependency>
-</dependencies>
- ```
+# Links
+See [releases](https://github.com/NEZNAMY/TAB/releases) for precompiled jar.  
+
+Has the plugin helped you in any way, and you wish to support the development?  
+You can purchase the plugin on [MC-Market](https://www.mc-market.org/resources/20631/), [Polymart](https://polymart.org/resource/484) or just [send a donation](https://paypal.me/neznamy1).
+  
+Supporters have access to high-quality [discord support](https://discord.gg/EaSvdk6).  
+
+Want to know more about the plugin's functions? Check out the [wiki](https://github.com/NEZNAMY/TAB/wiki).
+  

api/build.gradle.kts

@@ -0,0 +1,9 @@
+dependencies {
+    compileOnlyApi(libs.netty)
+    api(libs.jsonSimple) {
+        exclude("junit", "junit")
+    }
+    compileOnlyApi(libs.snakeyaml)
+    api(libs.yamlAssist)
+    compileOnlyApi(libs.gson)
+}

api/src/main/java/me/neznamy/tab/api/ArmorStand.java

@@ -1,96 +1,82 @@
 package me.neznamy.tab.api;
 
-import java.util.Set;
-
-import me.neznamy.tab.shared.Property;
-
 public interface ArmorStand {
 
 	/**
 	 * Returns true if offset is static, false if not
 	 * @return true if static, false if dynamic
 	 */
-	public boolean hasStaticOffset();
+	boolean hasStaticOffset();
 	
 	/**
 	 * Changes offset of the armor stand
 	 * @param offset - new offset
 	 */
-	public void setOffset(double offset);
-	
+	void setOffset(double offset);
+
 	/**
 	 * Returns offset of the armor stand
 	 * @return offset from base
 	 */
-	public double getOffset();
+	double getOffset();
 	
 	/**
 	 * Returns property for armor stand's name
 	 * @return property for armor stand's name
 	 */
-	public Property getProperty();
+	Property getProperty();
 	
 	/**
 	 * Teleports armor stand to owner's current location for everyone in range
 	 */
-	public void teleport();
+	void teleport();
 	
 	/**
 	 * Teleports armor stand to owner's current location for specified player
 	 * @param viewer - player to send packet to
 	 */
-	public void teleport(TabPlayer viewer);
+	void teleport(TabPlayer viewer);
 	
 	/**
 	 * Changes sneaking flag and sends packets to everyone in range
-	 * @param sneaking
+	 * @param	sneaking
+	 * 			new sneaking status
 	 */
-	public void sneak(boolean sneaking);
+	void sneak(boolean sneaking);
 	
 	/**
-	 * Despawns armor stand for everyone
+	 * DeSpawns armor stand for everyone
 	 */
-	public void destroy();
+	void destroy();
 	
 	/**
-	 * Despawns armor stand for specified player
+	 * DeSpawns armor stand for specified player
 	 * @param viewer - player to send packet to
 	 */
-	public void destroy(TabPlayer viewer);
+	void destroy(TabPlayer viewer);
 	
 	/**
 	 * Updates armor stand's name if needed
 	 */
-	public void refresh();
+	void refresh();
 	
 	/**
 	 * Updates visibility if needed
 	 * @param force - if refresh should be forced
 	 */
-	public void updateVisibility(boolean force);
-	
-	/**
-	 * Removes specified player from list of players in range
-	 * @param viewer - player to remove
-	 */
-	public void removeFromRegistered(TabPlayer viewer);
+	void updateVisibility(boolean force);
 	
 	/**
 	 * Returns entity ID of this armor stand
 	 * @return entity ID of this armor stand
 	 */
-	public int getEntityId();
+	int getEntityId();
 	
 	/**
 	 * Spawns armor stand for specified player
 	 * @param viewer - player to spawn for
-	 * @param addToRegistered - if player should be added to players in range
 	 */
-	public void spawn(TabPlayer viewer);
+	void spawn(TabPlayer viewer);
 	
-	/**
-	 * Returns list of players in entity tracking range (48 blocks)
-	 * @return list of nearby players
-	 */
-	public Set<TabPlayer> getNearbyPlayers();
+	void respawn(TabPlayer viewer);
 }

api/src/main/java/me/neznamy/tab/api/ArmorStandManager.java

@@ -0,0 +1,178 @@
+package me.neznamy.tab.api;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A helper class for easy management of armor stands of a player
+ */
+public class ArmorStandManager {
+
+	//map of registered armor stands
+	private final Map<String, ArmorStand> armorStands = new LinkedHashMap<>();
+	
+	//players in entity tracking range
+	private final List<TabPlayer> nearbyPlayers = Collections.synchronizedList(new ArrayList<>());
+	
+	//array to iterate over to avoid concurrent modification and slightly boost performance & memory
+	private ArmorStand[] armorStandArray = new ArmorStand[0];
+	
+	private TabPlayer[] nearbyPlayerArray = new TabPlayer[0];
+	
+	/**
+	 * Adds armor stand into list
+	 * @param name - key name of the armor stand
+	 * @param as - armor stand to add
+	 */
+	public synchronized void addArmorStand(String name, ArmorStand as) {
+		armorStands.put(name, as);
+		armorStandArray = armorStands.values().toArray(new ArmorStand[0]);
+		for (TabPlayer p : nearbyPlayerArray) as.spawn(p);
+	}
+	
+	/**
+	 * Returns armor stand with given name or null if not present
+	 * @param name - name of armor stand registered with
+	 * @return armor stand with given name
+	 */
+	public ArmorStand getArmorStand(String name) {
+		return armorStands.get(name);
+	}
+
+	/**
+	 * Removes armor stand from list. It is not automatically destroyed for players
+	 * @param name - name of armor stand to remove
+	 */
+	public void removeArmorStand(String name) {
+		armorStands.get(name).destroy();
+		armorStands.remove(name);
+		armorStandArray = armorStands.values().toArray(new ArmorStand[0]);
+	}
+
+	/**
+	 * Spawns all armor stands for specified viewer and adds them into nearby players
+	 * @param viewer - player to spawn armor stands for
+	 */
+	public void spawn(TabPlayer viewer) {
+		synchronized (nearbyPlayers) {
+			nearbyPlayers.add(viewer);
+			nearbyPlayerArray = nearbyPlayers.toArray(new TabPlayer[0]);
+		}
+		if (viewer.getVersion().getMinorVersion() < 8) return;
+		for (ArmorStand a : armorStandArray) a.spawn(viewer);
+	}
+
+	/**
+	 * Sets sneak value of armor stands to specified value
+	 * @param sneaking - new sneaking status
+	 */
+	public void sneak(boolean sneaking) {
+		for (ArmorStand a : armorStandArray) a.sneak(sneaking);
+	}
+
+	/**
+	 * Teleports armor stands to player's current location for all nearby players
+	 */
+	public void teleport() {
+		for (ArmorStand a : armorStandArray) a.teleport();
+	}
+
+	/**
+	 * Teleports armor stands to player's current location for specified viewer
+	 * @param viewer - player to teleport armor stands for
+	 */
+	public void teleport(TabPlayer viewer) {
+		for (ArmorStand a : armorStandArray) a.teleport(viewer);
+	}
+
+	/**
+	 * Refreshes name of all armor stands for all nearby players
+	 */
+	public void refresh() {
+		for (ArmorStand a : armorStandArray) a.refresh();
+	}
+
+	/**
+	 * Updates armor stand visibility for all armor stands
+	 * @param force - true if packets should be sent despite seemingly not needed
+	 */
+	public void updateVisibility(boolean force) {
+		for (ArmorStand a : armorStandArray) a.updateVisibility(force);
+	}
+
+	/**
+	 * Removes specified player from list of nearby players
+	 * @param viewer - player to remove
+	 */
+	public void unregisterPlayer(TabPlayer viewer) {
+		synchronized (nearbyPlayers) {
+			nearbyPlayers.remove(viewer);
+			nearbyPlayerArray = nearbyPlayers.toArray(new TabPlayer[0]);
+		}
+	}
+
+	/**
+	 * Sends destroy packet of all armor stands to everyone and clears nearby players list
+	 */
+	public void destroy() {
+		for (ArmorStand a : armorStandArray) a.destroy();
+		synchronized (nearbyPlayers) {
+			nearbyPlayers.clear();
+			nearbyPlayerArray = new TabPlayer[0];
+		}
+	}
+
+	/**
+	 * Sends destroy packet of all armor stands to specified player and removes them from nearby players list
+	 * @param viewer - player to destroy armor stands for
+	 */
+	public void destroy(TabPlayer viewer) {
+		for (ArmorStand a : armorStandArray) a.destroy(viewer);
+		unregisterPlayer(viewer);
+	}
+
+	/**
+	 * Returns true if manager contains armor stand with specified entity id, false if not
+	 * @param entityId - entity id
+	 * @return true if armor stand with specified entity id exists, false if not
+	 */
+	public boolean hasArmorStandWithID(int entityId) {
+		for (ArmorStand a : armorStandArray) {
+			if (a.getEntityId() == entityId) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Returns array of all registered armor stands
+	 * @return armor stand array
+	 */
+	public ArmorStand[] getArmorStands(){
+		return armorStandArray;
+	}
+
+	/**
+	 * Returns array of nearby players
+	 * @return array of nearby players
+	 */
+	public TabPlayer[] getNearbyPlayers(){
+		return nearbyPlayerArray;
+	}
+	
+	public boolean isNearby(TabPlayer viewer) {
+		return nearbyPlayers.contains(viewer);
+	}
+	
+	public void respawn() {
+		for (ArmorStand a : armorStandArray) {
+			for (TabPlayer viewer : nearbyPlayerArray) {
+				a.respawn(viewer);
+			}
+		}
+	}
+}

api/src/main/java/me/neznamy/tab/api/FeatureManager.java

@@ -0,0 +1,35 @@
+package me.neznamy.tab.api;
+
+public interface FeatureManager {
+
+	/**
+	 * Registers a feature, which will start receiving events
+	 * 
+	 * @param name - name of feature
+	 * @param feature - the handler
+	 */
+	void registerFeature(String name, TabFeature feature);
+	
+	/**
+	 * Unregisters feature making it no longer receive events. This does not run unload method nor cancel
+	 * tasks created by the feature
+	 * @param name - feature name defined in registerFeature
+	 */
+	void unregisterFeature(String name);
+	
+	/**
+	 * Returns whether a feature with said name is registered or not
+	 * 
+	 * @param name - name of feature defined in registerFeature method
+	 * @return true if feature exists, false if not
+	 */
+	boolean isFeatureEnabled(String name);
+
+	/**
+	 * Returns feature handler by its name
+	 * 
+	 * @param name - name of feature defined in registerFeature method
+	 * @return the feature or null if feature does not exist
+	 */
+	TabFeature getFeature(String name);
+}

api/src/main/java/me/neznamy/tab/api/HeaderFooterManager.java

@@ -0,0 +1,16 @@
+package me.neznamy.tab.api;
+
+public interface HeaderFooterManager {
+
+	void setHeader(TabPlayer player, String header);
+	
+	void setFooter(TabPlayer player, String footer);
+	
+	void setHeaderAndFooter(TabPlayer player, String header, String footer);
+	
+	void resetHeader(TabPlayer player);
+	
+	void resetFooter(TabPlayer player);
+	
+	void resetHeaderAndFooter(TabPlayer player);
+}

api/src/main/java/me/neznamy/tab/api/Property.java

@@ -0,0 +1,60 @@
+package me.neznamy.tab.api;
+
+public interface Property {
+
+	/**
+	 * Changes raw value to new one
+	 * @param rawValue - new value to be used
+	 */
+	void changeRawValue(String rawValue);
+
+	/**
+	 * Returns original raw value ignoring API calls
+	 * @return original raw value
+	 */
+	String getOriginalRawValue();
+
+	/**
+	 * Temporarily overrides current raw value with an API call
+	 * @param temporaryValue - temporary value to be assigned
+	 */
+	void setTemporaryValue(String temporaryValue);
+	
+	/**
+	 * Returns current temporary value
+	 * @return temporary value or null if not set
+	 */
+	String getTemporaryValue();
+
+	/**
+	 * Returns temporary value (via API) if present, raw value otherwise
+	 * @return current raw value
+	 */
+	String getCurrentRawValue();
+
+	/**
+	 * Returns last known value
+	 * @return last known value
+	 */
+	String get();
+
+	/**
+	 * Replaces all placeholders in current raw value, colorizes it, removes remove-strings and returns whether value changed or not
+	 * @return if updating changed value or not
+	 */
+	boolean update();
+	
+	/**
+	 * Replaces all placeholders in current raw value, colorizes it, removes remove-strings and returns it.
+	 * Equal to calling update() and then get().
+	 * @return updated value
+	 */
+	String updateAndGet();
+
+	/**
+	 * Returns value for defined viewer by applying relational placeholders to last known value
+	 * @param viewer - the viewer
+	 * @return format for the viewer
+	 */
+	String getFormat(TabPlayer viewer);
+}

api/src/main/java/me/neznamy/tab/api/PropertyConfiguration.java

@@ -0,0 +1,10 @@
+package me.neznamy.tab.api;
+
+public interface PropertyConfiguration {
+
+	void setProperty(String name, String property, String server, String world, String value);
+	
+	String[] getProperty(String name, String property, String server, String world);
+	
+	void remove(String name);
+}

api/src/main/java/me/neznamy/tab/api/ProtocolVersion.java

@@ -0,0 +1,141 @@
+package me.neznamy.tab.api;
+
+/**
+ * Enum class representing all possibly used protocol versions
+ */
+public enum ProtocolVersion {
+
+	UNKNOWN	("Unknown"),
+	PROXY	("Proxy"),
+	V1_18_1	(757),
+	V1_18	(757),
+	V1_17_1	(756),
+	V1_17	(755),
+	V1_16_5 (754),
+	V1_16_4	(754),
+	V1_16_3	(753),
+	V1_16_2	(751),
+	V1_16_1	(736),
+	V1_16	(735),
+	V1_15_2	(578),
+	V1_15_1	(575),
+	V1_15	(573),
+	V1_14_4	(498),
+	V1_14_3	(490),
+	V1_14_2	(485),
+	V1_14_1	(480),
+	V1_14	(477),
+	V1_13_2	(404),
+	V1_13_1	(401),
+	V1_13	(393),
+	V1_12_2	(340),
+	V1_12_1	(338),
+	V1_12	(335),
+	V1_11_2	(316),
+	V1_11_1	(316),
+	V1_11	(315),
+	V1_10_2	(210),
+	V1_10_1	(210),
+	V1_10	(210),
+	V1_9_4	(110),
+	V1_9_3	(110),
+	V1_9_2	(109),
+	V1_9_1	(108),
+	V1_9	(107),
+	V1_8	(47),
+	V1_7_10	(5),
+	V1_7_9	(5),
+	V1_7_8	(5),
+	V1_7_7	(5),
+	V1_7_6	(5),
+	V1_7_5	(4),
+	V1_7_4	(4),
+	V1_7_2	(4),
+	V1_6_4	(78),
+	V1_6_2	(74),
+	V1_6_1	(73),
+	V1_5_2	(61),
+	V1_5_1	(60),
+	V1_5	(60),
+	V1_4_7	(51),
+	V1_4_6	(51);
+
+	//version's network id found at https://wiki.vg/Protocol_version_numbers
+	private final int networkId;
+	
+	//minor version, such as 16
+	private final int minorVersion;
+	
+	//friendly name displayed in %player-version% placeholder
+	private final String friendlyName;
+
+	/**
+	 * Constructs new instance with given network id
+	 * @param networkId - network id of this version
+	 */
+	ProtocolVersion(int networkId){
+		this.networkId = networkId;
+		this.minorVersion = Integer.parseInt(toString().split("_")[1]);
+		this.friendlyName = toString().substring(1).replace("_", ".");
+	}
+	
+	/**
+	 * Constructs new instance with given friendly name
+	 * @param friendlyName - friendly name to display
+	 */
+	ProtocolVersion(String friendlyName){
+		this.networkId = 999;
+		this.minorVersion = 18;
+		this.friendlyName = friendlyName;
+	}
+
+	/**
+	 * Returns the version's network id
+	 * @return version's network id
+	 */
+	public int getNetworkId() {
+		return networkId;
+	}
+
+	/**
+	 * Returns user-friendly name of the version (such as 1.16.2 instead of V1_16_2)
+	 * @return	user-friendly name of the version
+	 */
+	public String getFriendlyName() {
+		return friendlyName;
+	}
+
+	/**
+	 * Returns minor version of this release, such as 8 for 1.8.x or 13 for 1.13.x
+	 * @return version's minor version
+	 */
+	public int getMinorVersion() {
+		return minorVersion;
+	}
+
+	/**
+	 * Returns enum constant of entered version or UNKNOWN if unknown version
+	 * @param friendlyName - friendly name of the version
+	 * @return version or UNKNOWN if version is unknown
+	 */
+	public static ProtocolVersion fromFriendlyName(String friendlyName) {
+		if (friendlyName.startsWith("1.8")) return V1_8;
+		try {
+			return valueOf("V" + friendlyName.replace(".", "_"));
+		} catch (IllegalArgumentException e) {
+			return UNKNOWN;
+		}
+	}
+
+	/**
+	 * Returns version from given network id
+	 * @param networkId - network id of protocol version
+	 * @return version from given network id
+	 */
+	public static ProtocolVersion fromNetworkId(int networkId) {
+		for (ProtocolVersion v : values()) {
+			if (networkId == v.getNetworkId()) return v;
+		}
+		return UNKNOWN;
+	}
+}

api/src/main/java/me/neznamy/tab/api/TabAPI.java

@@ -0,0 +1,107 @@
+package me.neznamy.tab.api;
+
+import java.util.UUID;
+
+import me.neznamy.tab.api.bossbar.BossBarManager;
+import me.neznamy.tab.api.config.ConfigurationFile;
+import me.neznamy.tab.api.placeholder.PlaceholderManager;
+import me.neznamy.tab.api.scoreboard.ScoreboardManager;
+import me.neznamy.tab.api.task.ThreadManager;
+import me.neznamy.tab.api.team.TeamManager;
+
+/**
+ * The primary API class to get instances of other API classes
+ */
+public abstract class TabAPI {
+
+	private static TabAPI instance;
+	
+	public static TabAPI getInstance() {
+		return instance;
+	}
+	
+	public static void setInstance(TabAPI instance) {
+		TabAPI.instance = instance;
+	}
+
+	/**
+	 * Returns player object from given UUID
+	 * @return player object from given UUID
+	 * @param id - Player UUID
+	 */
+	public abstract TabPlayer getPlayer(UUID id);
+
+	/**
+	 * Returns player object from given name
+	 * @return player object from given name
+	 * @param name - Player name
+	 */
+	public abstract TabPlayer getPlayer(String name);
+	
+	/**
+	 * Returns collection of all online players. Will return empty list if plugin is disabled (due to a broken configuration file for example).
+	 * @return collection of online players
+	 */
+	public abstract TabPlayer[] getOnlinePlayers();
+
+	/**
+	 * Return BossBar manager instance if the feature is enabled. Returns null otherwise.
+	 * @return BossBar manager
+	 */
+	public abstract BossBarManager getBossBarManager();
+	
+	/**
+	 * Returns scoreboard manager instance if the feature is enabled. Returns null otherwise.
+	 * @return scoreboard manager
+	 */
+	public abstract ScoreboardManager getScoreboardManager();
+	
+	/**
+	 * Returns team manager instance if the feature is enabled, false otherwise
+	 * @return team manager
+	 */
+	public abstract TeamManager getTeamManager();
+	
+	public abstract HeaderFooterManager getHeaderFooterManager();
+	
+	/**
+	 * Returns PlaceholderManager instance
+	 * @return PlaceholderManager instance
+	 */
+	public abstract PlaceholderManager getPlaceholderManager();
+
+	/**
+	 * Returns feature manager instance
+	 * @return feature manager instance
+	 */
+	public abstract FeatureManager getFeatureManager();
+	
+	public abstract TablistFormatManager getTablistFormatManager();
+
+	/**
+	 * Returns server version. On proxy installation returns PROXY.
+	 * @return server version
+	 */
+	public abstract ProtocolVersion getServerVersion();
+	
+	/**
+	 * Prints message into console
+	 * @param message - message to print
+	 * @param translateColors - true if colors should be translated, false if not
+	 */
+	public abstract void sendConsoleMessage(String message, boolean translateColors);
+	
+	public abstract ThreadManager getThreadManager();
+	
+	public abstract ConfigurationFile getPlayerCache();
+	
+	public abstract ConfigurationFile getConfig();
+	
+	public abstract PropertyConfiguration getGroups();
+	
+	public abstract PropertyConfiguration getUsers();
+	
+	public abstract void debug(String message);
+	
+	public abstract void logError(String message, Throwable t);
+}

api/src/main/java/me/neznamy/tab/api/TabFeature.java

@@ -0,0 +1,262 @@
+package me.neznamy.tab.api;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import me.neznamy.tab.api.protocol.PacketPlayOutPlayerInfo;
+import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardDisplayObjective;
+import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardObjective;
+
+public abstract class TabFeature {
+
+	private final String featureName;
+	private final String refreshDisplayName;
+	protected final String[] disabledServers;
+	private final boolean serverWhitelistMode;
+	protected final String[] disabledWorlds;
+	private final boolean worldWhitelistMode;
+	private final List<TabPlayer> disabledPlayers = new ArrayList<>();
+	private final List<String> methodOverrides = new ArrayList<>();
+	
+	protected TabFeature(String featureName, String refreshDisplayName) {
+		this(featureName, refreshDisplayName, null, null);
+	}
+	
+	protected TabFeature(String featureName, String refreshDisplayName, List<String> disabledServers, List<String> disabledWorlds) {
+		this.featureName = featureName;
+		this.refreshDisplayName = refreshDisplayName;
+		if (disabledServers != null) {
+			this.disabledServers = disabledServers.toArray(new String[0]);
+			serverWhitelistMode = disabledServers.contains("WHITELIST");
+		} else {
+			this.disabledServers = new String[0];
+			serverWhitelistMode = false;
+		}
+		if (disabledWorlds != null) {
+			this.disabledWorlds = disabledWorlds.toArray(new String[0]);
+			worldWhitelistMode = disabledWorlds.contains("WHITELIST");
+		} else {
+			this.disabledWorlds = new String[0];
+			worldWhitelistMode = false;
+		}
+		try {
+			if (getClass().getMethod("onCommand", TabPlayer.class, String.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onCommand");
+			if (getClass().getMethod("onJoin", TabPlayer.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onJoin");
+			if (getClass().getMethod("onQuit", TabPlayer.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onQuit");
+			if (getClass().getMethod("onWorldChange", TabPlayer.class, String.class, String.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onWorldChange");
+			if (getClass().getMethod("onDisplayObjective", TabPlayer.class, PacketPlayOutScoreboardDisplayObjective.class).getDeclaringClass() != TabFeature.class) 
+				methodOverrides.add("onDisplayObjective");
+			if (getClass().getMethod("onLoginPacket", TabPlayer.class).getDeclaringClass() != TabFeature.class) 
+				methodOverrides.add("onLoginPacket");
+			if (getClass().getMethod("onObjective", TabPlayer.class, PacketPlayOutScoreboardObjective.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onObjective");
+			if (getClass().getMethod("onPlayerInfo", TabPlayer.class, PacketPlayOutPlayerInfo.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onPlayerInfo");
+			if (getClass().getMethod("onPacketReceive", TabPlayer.class, Object.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onPacketReceive");
+			if (getClass().getMethod("onPacketSend", TabPlayer.class, Object.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("onPacketSend");
+			if (getClass().getMethod("refresh", TabPlayer.class, boolean.class).getDeclaringClass() != TabFeature.class)
+				methodOverrides.add("refresh");
+		} catch (NoSuchMethodException e) {
+			//this will never happen
+		}
+	}
+	
+	/**
+	 * Loads all players and sends packets
+	 */
+	public void load() {
+		//empty by default
+	}
+	
+	/**
+	 * Unloads all players and sends clear packets
+	 */
+	public void unload() {
+		//empty by default
+	}
+	
+	/**
+	 * Processes command from player
+	 * @param sender - command sender
+	 * @param message - command line
+	 * @return true if event should be cancelled, false if not
+	 */
+	public boolean onCommand(TabPlayer sender, String message) {
+		return false;
+	}
+	
+	/**
+	 * Processes join event
+	 * @param connectedPlayer - player who connected
+	 */
+	public void onJoin(TabPlayer connectedPlayer) {
+		//empty by default
+	}
+	
+	/**
+	 * Processes quit event
+	 * @param disconnectedPlayer - player who disconnected
+	 */
+	public void onQuit(TabPlayer disconnectedPlayer) {
+		disabledPlayers.remove(disconnectedPlayer);
+	}
+	
+	/**
+	 * Processes world switch
+	 * @param changed - player who switched world
+	 * @param from - world player changed from
+	 * @param to - world player changed to
+	 */
+	public void onWorldChange(TabPlayer changed, String from, String to) {
+		//empty by default
+	}
+	
+	/**
+	 * Processes server switch
+	 * @param changed - player who switched server
+	 * @param from - server player changed from
+	 * @param to - server player changed to
+	 */
+	public void onServerChange(TabPlayer changed, String from, String to) {
+		onWorldChange(changed, null, null);
+	}
+	
+	/**
+	 * Processes the packet send and returns true if packet should be cancelled
+	 * @param receiver - player receiving packet
+	 * @param packet - received packet
+	 */
+	public void onDisplayObjective(TabPlayer receiver, PacketPlayOutScoreboardDisplayObjective packet) {
+		//empty by default
+	}
+	
+	/**
+	 * Processes login packet, only available on BungeeCord
+	 * @param packetReceiver - player receiving client reset packet
+	 */
+	public void onLoginPacket(TabPlayer packetReceiver) {
+		//empty by default
+	}
+	
+	/**
+	 * Processes the packet send
+	 * @param receiver - player receiving packet
+	 * @param packet - received packet
+	 */
+	public void onObjective(TabPlayer receiver, PacketPlayOutScoreboardObjective packet) {
+		//empty by default
+	}
+	
+	/**
+	 * Processes the packet send and possibly modifies it
+	 * @param receiver - player receiving packet
+	 * @param info - received packet
+	 */
+	public void onPlayerInfo(TabPlayer receiver, PacketPlayOutPlayerInfo info) {
+		//empty by default
+	}
+	
+	/**
+	 * Processes raw packet sent by client
+	 * @param sender - packet sender
+	 * @param packet - packet received
+	 * @return true if false should be cancelled, false if not
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
+	 */
+	public boolean onPacketReceive(TabPlayer sender, Object packet) throws ReflectiveOperationException {
+		return false;
+	}
+	
+	/**
+	 * Processes raw packet sent to client
+	 * @param receiver - packet receiver
+	 * @param packet - the packet
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
+	 */
+	public void onPacketSend(TabPlayer receiver, Object packet) throws ReflectiveOperationException {
+		//empty by default
+	}
+
+	/**
+	 * Performs refresh of specified player
+	 * @param refreshed - player to refresh
+	 * @param force - if refresh should be forced despite refresh seemingly not needed
+	 */
+	public void refresh(TabPlayer refreshed, boolean force) {
+		//empty by default
+	}
+
+	/**
+	 * Registers this feature as one using specified placeholders
+	 * @param placeholders - placeholders to add as used in this feature
+	 */
+	public void addUsedPlaceholders(Collection<String> placeholders) {
+		if (placeholders.isEmpty()) return;
+		placeholders.forEach(p -> TabAPI.getInstance().getPlaceholderManager().addUsedPlaceholder(p, this));
+	}
+	
+	/**
+	 * Returns true if world or server is disabled, false if not
+	 * @param world - world to check
+	 * @param server - server to check
+	 * @return true if feature should be disabled, false if not
+	 */
+	public boolean isDisabled(String server, String world) {
+		boolean contains = contains(disabledWorlds, world);
+		if (worldWhitelistMode) contains = !contains;
+		if (contains) return true;
+		contains = contains(disabledServers, server);
+		if (serverWhitelistMode) contains = !contains;
+		return contains;
+	}
+	
+	protected boolean contains(String[] list, String element) {
+		if (element == null) return false;
+		for (String s : list) {
+			if (s.endsWith("*")) {
+				if (element.toLowerCase().startsWith(s.substring(0, s.length()-1).toLowerCase())) return true;
+			} else {
+				if (element.equalsIgnoreCase(s)) return true;
+			}
+		}
+		return false;
+	}
+	
+	/**
+	 * Returns name of the feature displayed in /tab cpu.
+	 * @return name of the feature displayed in /tab cpu
+	 */
+	public String getFeatureName() {
+		return featureName;
+	}
+
+	public boolean overridesMethod(String method) {
+		return methodOverrides.contains(method);
+	}
+
+	public boolean isDisabledPlayer(TabPlayer p) {
+		return disabledPlayers.contains(p);
+	}
+	
+	public void addDisabledPlayer(TabPlayer p) {
+		if (disabledPlayers.contains(p)) return;
+		disabledPlayers.add(p);
+	}
+	
+	public void removeDisabledPlayer(TabPlayer p) {
+		disabledPlayers.remove(p);
+	}
+
+	public String getRefreshDisplayName() {
+		return refreshDisplayName;
+	}
+}

api/src/main/java/me/neznamy/tab/api/TabPlayer.java

@@ -0,0 +1,261 @@
+package me.neznamy.tab.api;
+
+import java.util.UUID;
+
+import io.netty.channel.Channel;
+import me.neznamy.tab.api.chat.IChatBaseComponent;
+import me.neznamy.tab.api.protocol.TabPacket;
+
+/**
+ * An interface representing a player
+ */
+public interface TabPlayer {
+
+	/**
+	 * Refreshes all visuals on the player
+	 */
+	void forceRefresh();
+
+	/**
+	 * Returns player's name
+	 * @return Player's name
+	 */
+	String getName();
+
+	/**
+	 * Returns player's UUID
+	 * @return Player's UUID
+	 */
+	UUID getUniqueId();
+
+	/**
+	 * Returns player's uuid used in TabList. This may only be different from real uuid if
+	 * TAB is installed on velocity with some specific velocity setup
+	 * @return player's uuid in TabList
+	 */
+	UUID getTablistUUID();
+
+	/**
+	 * Returns player's protocol version
+	 * @return player's protocol version
+	 */
+	ProtocolVersion getVersion();
+
+	/**
+	 * Returns platform-specific entity
+	 * @return an instance of bukkit/bungee player depending on platform
+	 */
+	Object getPlayer();
+
+	/**
+	 * Returns player's current world name (on BungeeCord this requires bridge installed)
+	 * @return name of world where player is currently in, null on BungeeCord if bridge is not installed
+	 */
+	String getWorld();
+	
+	/**
+	 * Returns player's current server name on BungeeCord (on bukkit this returns null)
+	 * @return name of server where player is currently in, null on bukkit
+	 */
+	String getServer();
+
+	/**
+	 * Performs platform-specific API call to check for permission and returns the result
+	 * @param permission - the permission to check for
+	 * @return - true if player has permission, false if not
+	 */
+	boolean hasPermission(String permission);
+
+	/**
+	 * Sends the player a custom universal packet
+	 * @param packet - packet to send
+	 */
+	void sendCustomPacket(TabPacket packet);
+
+	/**
+	 * Sends the player a custom universal packet and adds that packet into counter that
+	 * is displayed in /tab cpu
+	 * @param packet - packet to send
+	 * @param feature - feature to increment sent packet counter of 
+	 */
+	void sendCustomPacket(TabPacket packet, TabFeature feature);
+	
+	/**
+	 * Sends the player a custom universal packet and adds that packet into counter that
+	 * is displayed in /tab cpu
+	 * @param packet - packet to send
+	 * @param feature - feature to increment sent packet counter of 
+	 */
+	void sendCustomPacket(TabPacket packet, String feature);
+
+	/**
+	 * Sends the player a platform-specific packet
+	 * @param packet - an instance of packet depending on platform
+	 */
+	void sendPacket(Object packet);
+
+	/**
+	 * Sends the player a platform-specific packet and adds that packet into counter that
+	 * is displayed in /tab cpu
+	 * @param packet - an instance of packet depending on platform
+	 * @param feature - feature to increment sent packet counter of 
+	 */
+	void sendPacket(Object packet, TabFeature feature);
+
+	/**
+	 * Sends the player a platform-specific packet and adds that packet into counter that
+	 * is displayed in /tab cpu
+	 * @param packet - an instance of packet depending on platform
+	 * @param feature - feature to increment sent packet counter of
+	 */
+	void sendPacket(Object packet, String feature);
+
+	/**
+	 * Returns player's property by name
+	 * @param name - name of property
+	 * @return the property or null if not found
+	 */
+	Property getProperty(String name);
+
+	/**
+	 * Sends a message to the player
+	 * @param message - message to be sent
+	 * @param translateColors - whether colors should be translated or not
+	 */
+	void sendMessage(String message, boolean translateColors);
+
+	/**
+	 * Sends specified component as a chat message
+	 * @param message - message to send
+	 */
+	void sendMessage(IChatBaseComponent message);
+
+	/**
+	 * Returns player's primary permission group
+	 * @return player's group depending on configuration
+	 */
+	String getGroup();
+
+	/**
+	 * Toggles armor stands preview mode for the player
+	 */
+	void toggleNametagPreview();
+
+	/**
+	 * Returns whether player is previewing NameTag or not
+	 * @return true if previewing, false if not
+	 */
+	boolean isPreviewingNametag();
+
+	/**
+	 * Returns player's channel or null if server is 1.7 or older
+	 * @return player's channel
+	 */
+	Channel getChannel();
+
+	/**
+	 * Returns player's ping calculated by server
+	 * @return player's ping
+	 */
+	int getPing();
+
+	/**
+	 * Returns player's platform-specific skin data
+	 * @return player's skin
+	 */
+	Object getSkin();
+
+	/**
+	 * Returns true once the player is successfully loaded (onJoin method ran through all methods)
+	 * @return true if player is fully loaded, false otherwise
+	 */
+	boolean isLoaded();
+
+	/**
+	 * Sets property with specified name to new value. If property did not exist before, it is
+	 * created and true is returned. If it existed, it is overridden and true is returned. False is returned otherwise.
+	 * @param feature - feature using this property to get placeholders registered
+	 * @param identifier - property name
+	 * @param rawValue - new raw value
+	 * @return true if value changed / did not exist, false if value did not change
+	 */
+	boolean setProperty(TabFeature feature, String identifier, String rawValue);
+
+	/**
+	 * Loads property from config using standard property loading algorithm
+	 * @param property - property name to load
+	 */
+	void loadPropertyFromConfig(TabFeature feature, String property);
+
+	/**
+	 * Loads property from config using standard property loading algorithm. If the property is
+	 * not set in config, sets it to ifNotSet value
+	 * @param property - property name to load
+	 * @param ifNotSet - value to use if property is not defined in config
+	 */
+	void loadPropertyFromConfig(TabFeature feature, String property, String ifNotSet);
+
+	/**
+	 * Returns name of player's scoreboard team or null if NameTag feature is disabled
+	 * @return name of player's team
+	 */
+	String getTeamName();
+
+	/**
+	 * Returns user-friendly explanation of team name
+	 * @return explanation behind team name
+	 */
+	String getTeamNameNote();
+
+	/**
+	 * Returns true if player is disguised using LibsDisguises
+	 * @return true if player is disguised, false if not
+	 */
+	boolean isDisguised();
+
+	/**
+	 * Returns true if player has invisibility potion, false if not. For bukkit, API is used, for BungeeCord
+	 * bukkit bridge is used
+	 * @return true if player has invisibility potion, false if not
+	 */
+	boolean hasInvisibilityPotion();
+
+	/**
+	 * Currently only PV hook on BungeeCord for global PlayerList function. Looking to expand this
+	 * in the future
+	 * @return true if vanished with PV on BungeeCord
+	 */
+	boolean isVanished();
+
+	/**
+	 * Returns true if player is online according to server
+	 * @return true if online, false if not
+	 */
+	boolean isOnline();
+
+	/**
+	 * Returns player's armor stand manager if unlimited GameMode mode is enabled, null if disabled
+	 * @return player's armor stand manager
+	 */
+	ArmorStandManager getArmorStandManager();
+
+	/**
+	 * Sets player's armor stands manager to new instance
+	 * @param armorStandManager - new instance
+	 */
+	void setArmorStandManager(ArmorStandManager armorStandManager);
+	
+	/**
+	 * Returns GameMode of the player (0 for survival, 1 creative, 2 adventure, 3 spectator)
+	 * @return GameMode of the player
+	 */
+	int getGamemode();
+	
+	boolean isBedrockPlayer();
+
+	void setTemporaryGroup(String group);
+
+	boolean hasTemporaryGroup();
+
+	void resetTemporaryGroup();
+}

api/src/main/java/me/neznamy/tab/api/TablistFormatManager.java

@@ -0,0 +1,29 @@
+package me.neznamy.tab.api;
+
+public interface TablistFormatManager {
+
+	void setPrefix(TabPlayer player, String prefix);
+	
+	void setName(TabPlayer player, String customName);
+	
+	void setSuffix(TabPlayer player, String suffix);
+	
+	void resetPrefix(TabPlayer player);
+	
+	void resetName(TabPlayer player);
+	
+	void resetSuffix(TabPlayer player);
+	
+	String getCustomPrefix(TabPlayer player);
+	
+	String getCustomName(TabPlayer player);
+	
+	String getCustomSuffix(TabPlayer player);
+	
+	String getOriginalPrefix(TabPlayer player);
+	
+	String getOriginalName(TabPlayer player);
+	
+	String getOriginalSuffix(TabPlayer player);
+	
+}

api/src/main/java/me/neznamy/tab/api/bossbar/BarColor.java

@@ -1,7 +1,8 @@
 package me.neznamy.tab.api.bossbar;
 
 /**
- * An enum representing bossbar colors
+ * An enum representing all available BossBar colors.
+ * Calling ordinal() will return color's network ID.
  */
 public enum BarColor {
 
@@ -11,5 +12,5 @@ public enum BarColor {
 	GREEN,
 	YELLOW,
 	PURPLE,
-	WHITE;
+	WHITE
 }

api/src/main/java/me/neznamy/tab/api/bossbar/BarStyle.java

@@ -0,0 +1,36 @@
+package me.neznamy.tab.api.bossbar;
+
+/**
+ * An enum representing all available BossBar styles.
+ * Calling ordinal() will return style's network ID.
+ * Style names are equal to NMS names.
+ */
+public enum BarStyle {
+
+	PROGRESS("SOLID"),
+	NOTCHED_6("SEGMENTED_6"),
+	NOTCHED_10("SEGMENTED_10"),
+	NOTCHED_12("SEGMENTED_12"),
+	NOTCHED_20("SEGMENTED_20");
+
+	/** Style's name used in Bukkit API */
+	private final String bukkitName;
+
+	/**
+	 * Initializes enum constant with given bukkit name
+	 * 
+	 * @param 	bukkitName
+	 * 			Name of color to be returned in {@code getBukkitName()}
+	 */
+	BarStyle(String bukkitName){
+		this.bukkitName = bukkitName;
+	}
+
+	/**
+	 * Returns name of this style in Bukkit API
+	 * @return	name of this style in Bukkit API
+	 */
+	public String getBukkitName() {
+		return bukkitName;
+	}
+}

api/src/main/java/me/neznamy/tab/api/bossbar/BossBar.java

@@ -0,0 +1,185 @@
+package me.neznamy.tab.api.bossbar;
+
+import java.util.List;
+import java.util.UUID;
+
+import me.neznamy.tab.api.TabPlayer;
+
+/**
+ * An interface representing a BossBar line.
+ * <p>
+ * For clients 1.8 and lower it uses wither, which only allows 1 bar 
+ * to be displayed at a time. Entity packets are not available on BungeeCord,
+ * where nothing will be displayed for these players.
+ * <p>
+ * For 1.9+ it uses the new BossBar feature, allowing configurable styles
+ * and colors, as well as display several bars at once. Limit of maximum 
+ * displayed BossBars depends on client resolution and GUI scale, up to
+ * 9 concurrent BossBars displayed at once.
+ */
+public interface BossBar {
+
+	/**
+	 * Returns name of this BossBar. If it was defined in config, returns
+	 * the name specified in config. If it was made using the API, returns
+	 * randomly generated ID given to this BossBar when creating.
+	 * @return	name of BossBar
+	 */
+	String getName();
+
+	/**
+	 * Returns randomly generated uuid of this BossBar used internally to match
+	 * the BossBar in client with packets or with Bukkit API BossBar instances.
+	 * @return	uuid of this BossBar
+	 */
+	UUID getUniqueId();
+
+	/**
+	 * Changes BossBar title to specified string, supporting placeholders.
+	 * <p>
+	 * If title contains new placeholders not used before, they are registered using
+	 * standard registration logic and refreshed periodically. No need to call
+	 * this method to try to keep placeholder values up to date.
+	 * <p>
+	 * If specified title is equal to the current one, nothing happens.
+	 * 
+	 * @param	title
+	 * 			New title to display in this BossBar
+	 */
+	void setTitle(String title);
+
+	/**
+	 * Changes BossBar progress to specified string, supporting placeholders.
+	 * The string must be a string version of a float value, or a placeholder that 
+	 * outputs a float value with range 0-100.
+	 * <p>
+	 * If progress contains new placeholders not used before, they are registered using
+	 * standard registration logic and refreshed periodically. No need to call
+	 * this method to try to keep placeholder values up to date.
+	 * <p>
+	 * If specified progress is equal to the current one, nothing happens.
+	 * 
+	 * @param	progress
+	 * 			New progress to use in this BossBar
+	 */
+	void setProgress(String progress);
+
+	/**
+	 * Changes BossBar progress to specified value ranging from 0 to 100.
+	 * <p>
+	 * If specified progress is equal to the current one, nothing happens.
+	 * @param	progress
+	 * 			New progress to use in this BossBar
+	 */
+	void setProgress(float progress);
+
+	/**
+	 * Changes BossBar color to specified string, supporting placeholders.
+	 * The string must be a string version of one of the supported values, 
+	 * or a placeholder that outputs one of them.
+	 * <p>
+	 * If color contains new placeholders not used before, they are registered using
+	 * standard registration logic and refreshed periodically. No need to call
+	 * this method to try to keep placeholder values up to date.
+	 * <p>
+	 * If specified color is equal to the current one, nothing happens.
+	 * 
+	 * @param	color
+	 * 			New color to use in this BossBar
+	 */
+	void setColor(String color);
+
+	/**
+	 * Changes BossBar color to specified enum constant.
+	 * <p>
+	 * If specified color is equal to the current one, nothing happens.
+	 * 
+	 * @param	color
+	 * 			New color to use in this BossBar
+	 */
+	void setColor(BarColor color);
+
+	/**
+	 * Changes BossBar style to specified string, supporting placeholders.
+	 * The string must be a string version of one of the supported values, 
+	 * or a placeholder that outputs one of them.
+	 * <p>
+	 * If style contains new placeholders not used before, they are registered using
+	 * standard registration logic and refreshed periodically. No need to call
+	 * this method to try to keep placeholder values up to date.
+	 * <p>
+	 * If specified style is equal to the current one, nothing happens.
+	 * 
+	 * @param	style
+	 * 			New style to use in this BossBar
+	 */
+	void setStyle(String style);
+
+	/**
+	 * Changes BossBar style to specified enum constant.
+	 * <p>
+	 * If specified style is equal to the current one, nothing happens.
+	 * 
+	 * @param	style
+	 * 			New style to use in this BossBar
+	 */
+	void setStyle(BarStyle style);
+
+	/**
+	 * Returns current title of the BossBar in raw format. If it contains placeholders,
+	 * their raw identifiers are used in the result.
+	 * @return	title of the BossBar
+	 */
+	String getTitle();
+
+	/**
+	 * Returns progress of the BossBar as a string, which is either entered string
+	 * containing placeholders or entered number converted to string
+	 * @return	entered progress as a string
+	 */
+	String getProgress();
+
+	/**
+	 * Returns color of the BossBar as a string, which is either entered string
+	 * containing placeholders or entered enum value converted to string
+	 * @return	entered color as a string
+	 */
+	String getColor();
+
+	/**
+	 * Returns style of the BossBar as a string, which is either entered string
+	 * containing placeholders or entered enum value converted to string
+	 * @return	entered style as a string
+	 */
+	String getStyle();
+
+	/**
+	 * Registers this BossBar to specified player.
+	 * <p>
+	 * If the player already sees this BossBar, nothing happens.
+	 * 
+	 * @param	player
+	 * 			Player to register this BossBar to
+	 */
+	void addPlayer(TabPlayer player);
+
+	/**
+	 * Unregisters this BossBar from specified player.
+	 * <p>
+	 * If the player does not see this BossBar, nothing happens.
+	 * 
+	 * @param	player
+	 * 			Player to unregister this BossBar from
+	 */
+	void removePlayer(TabPlayer player);
+
+	/**
+	 * Returns list of players who can see this BossBar.
+	 * <p>
+	 * The returned list can only be used to read. Writing
+	 * will not work properly. For adding/removing players see {@link #addPlayer(TabPlayer)}
+	 * and {@link #removePlayer(TabPlayer)}.
+	 * @return	List of players seeing this BossBar
+	 */
+	List<TabPlayer> getPlayers();
+}

api/src/main/java/me/neznamy/tab/api/bossbar/BossBarManager.java

@@ -0,0 +1,167 @@
+package me.neznamy.tab.api.bossbar;
+
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import me.neznamy.tab.api.TabPlayer;
+
+/**
+ * An interface allowing work with BossBars such as creating, sending
+ * and toggling.
+ * <p>
+ * Instance can be obtained using {@link me.neznamy.tab.api.TabAPI#getBossBarManager()}.
+ * This requires the BossBar feature to be enabled in config, otherwise the method will
+ * return null.
+ */
+public interface BossBarManager {
+
+	/**
+	 * Creates BossBar with specified parameters and registers it to BossBar manager,
+	 * allowing to retrieve it later.
+	 * 
+	 * @param	title
+	 * 			Title to display, supports placeholders
+	 * 
+	 * @param	progress
+	 * 			Progress to use. Must be between 0 and 100
+	 * 
+	 * @param	color
+	 * 			Color to use
+	 * 
+	 * @param	style
+	 * 			Style to use
+	 * @return	The newly created BossBar
+	 */
+	BossBar createBossBar(String title, float progress, BarColor color, BarStyle style);
+
+	/**
+	 * Creates BossBar with specified parameters and registers it to BossBar manager,
+	 * allowing to retrieve it later.
+	 * 
+	 * @param	title
+	 * 			Title to display, supports placeholders
+	 * 
+	 * @param	progress
+	 * 			Progress to use. Must be a string version of a number, or
+	 * 			a placeholder that returns a number
+	 * 
+	 * @param	color
+	 * 			Color to use. Must be a string version of one of enum constants, or
+	 * 			a placeholder that returns one of them
+	 * 
+	 * @param	style
+	 * 			Style to use. Must be a string version of one of enum constants, or
+	 * 			a placeholder that returns one of them
+	 * @return	The newly created BossBar
+	 */
+	BossBar createBossBar(String title, String progress, String color, String style);
+
+	/**
+	 * Returns registered BossBar with given name. For BossBars from config it is the name
+	 * they were created with, for API BossBars their randomly generated name, which can be
+	 * retrieved using {@link me.neznamy.tab.api.bossbar.BossBar#getName()}.
+	 * Returns null if no such BossBar exists.
+	 * 
+	 * @param	name
+	 * 			Name of registered BossBar
+	 * @return	BossBar with specified name
+	 */
+	BossBar getBossBar(String name);
+
+	/**
+	 * Returns registered BossBar with specified UUID. This UUID is randomly generated when
+	 * BossBar is created and used in packets / to match which the one from Bukkit API.
+	 * Returns null if no such BossBar exists.
+	 * 
+	 * @param	id
+	 * 			UUID to return BossBar by
+	 * @return	BossBar with specified uuid
+	 */
+	BossBar getBossBar(UUID id);
+
+	/**
+	 * Returns a map of all registered BossBars. This includes both BossBars from config
+	 * and those registered via API.
+	 * <p>
+	 * Map key is BossBar's name available in {@link me.neznamy.tab.api.bossbar.BossBar#getName()},
+	 * map value is the BossBar interface.
+	 * @return	all registered BossBars
+	 */
+	Map<String, BossBar> getRegisteredBossBars();
+
+	/**
+	 * Toggles BossBar for this player and sends toggle message if {@code sendToggleMessage} is true.
+	 * 
+	 * @param	player
+	 * 			Player to toggle BossBar for
+	 * 
+	 * @param	sendToggleMessage
+	 * 			{@code true} if toggle message should be sent, {@code false} if not
+	 * @see #hasBossBarVisible(TabPlayer)
+	 * @see #setBossBarVisible(TabPlayer, boolean, boolean)
+	 */
+	void toggleBossBar(TabPlayer player, boolean sendToggleMessage);
+
+	/**
+	 * Returns true if player can see BossBars, false if toggled via command or API.
+	 * 
+	 * @param	player
+	 * 			Player to check toggle status of
+	 * @return	{@code true} if visible, {@code false} if disabled (toggled)
+	 * @see #toggleBossBar(TabPlayer, boolean)
+	 * @see #setBossBarVisible(TabPlayer, boolean, boolean)
+	 */
+	boolean hasBossBarVisible(TabPlayer player);
+
+	/**
+	 * Sets BossBar visibility of player to set value. If value did not change, nothing happens.
+	 * If visibility changed, toggle message is sent if {@code sendToggleMessage} is {@code true}.
+	 * 
+	 * @param	player
+	 * 			Player to set BossBar visibility of
+	 * @param	visible
+	 * 			{@code true} if BossBar should be visible, {@code false} if not
+	 * @param	sendToggleMessage
+	 * 			{@code true} if toggle message should be sent if value changed, {@code false} if not
+	 * @see #toggleBossBar(TabPlayer, boolean)
+	 * @see #hasBossBarVisible(TabPlayer)
+	 */
+	void setBossBarVisible(TabPlayer player, boolean visible, boolean sendToggleMessage);
+
+	/**
+	 * Temporarily displays registered BossBar to player for specified amount of time in milliseconds.
+	 * @param	player
+	 * 			Player to show BossBar to
+	 * @param	bossBar
+	 * 			Name of registered BossBar to show
+	 * @param	duration
+	 * 			In milliseconds for how long should BossBar be displayed
+	 * @throws	IllegalArgumentException
+	 * 			if no BossBar with specified name exists
+	 * @see #announceBossBar(String, int)
+	 * @see #getAnnouncedBossBars()
+	 */
+	void sendBossBarTemporarily(TabPlayer player, String bossBar, int duration);
+
+	/**
+	 * Temporarily displays registered BossBar to all players for specified amount of time in milliseconds.
+	 * @param	bossBar
+	 * 			Name of registered BossBar to show
+	 * @param	duration
+	 * 			In milliseconds for how long should BossBar be displayed
+	 * @throws	IllegalArgumentException
+	 * 			if no BossBar with specified name exists
+	 * @see #sendBossBarTemporarily(TabPlayer, String, int)
+	 * @see #getAnnouncedBossBars()
+	 */
+	void announceBossBar(String bossBar, int duration);
+
+	/**
+	 * Returns list of BossBars which are currently being announced.
+	 * @return	list of currently active BossBar announcements
+	 * @see #sendBossBarTemporarily(TabPlayer, String, int)
+	 * @see #announceBossBar(String, int)
+	 */
+	List<BossBar> getAnnouncedBossBars();
+}

api/src/main/java/me/neznamy/tab/api/chat/ChatClickable.java

@@ -0,0 +1,59 @@
+package me.neznamy.tab.api.chat;
+
+import me.neznamy.tab.api.util.Preconditions;
+
+/**
+ * Class for click event action in chat component
+ */
+public class ChatClickable {
+
+	/** Click action */
+	private final EnumClickAction action;
+
+	/** Click value */
+	private final String value;
+
+	/**
+	 * Constructs new instance with given action and value.
+	 * @param	action
+	 * 			click event action
+	 * @param	value
+	 * 			click event value
+	 * @throws	IllegalArgumentException
+	 * 			if {@code action} is null or {@code value} is null
+	 */
+	public ChatClickable(EnumClickAction action, String value) {
+		Preconditions.checkNotNull(action, "hover action cannot be null");
+		Preconditions.checkNotNull(value, "hover value cannot be null");
+		this.action = action;
+		this.value = value;
+	}
+
+	/**
+	 * Returns click action defined in constructor
+	 * @return	click action
+	 */
+	public EnumClickAction getAction() {
+		return action;
+	}
+
+	/**
+	 * Returns click action defined in constructor
+	 * @return	click action
+	 */
+	public String getValue() {
+		return value;
+	}
+
+	/**
+	 * Enum for all possible click actions
+	 */
+	public enum EnumClickAction {
+		
+		OPEN_URL,
+		RUN_COMMAND,
+		CHANGE_PAGE, //since 1.8
+		SUGGEST_COMMAND,
+		COPY_TO_CLIPBOARD //since 1.15
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/ChatComponentEntity.java

@@ -0,0 +1,38 @@
+package me.neznamy.tab.api.chat;
+
+import java.util.UUID;
+
+import com.google.gson.JsonObject;
+
+public class ChatComponentEntity extends IChatBaseComponent {
+
+	private final String type;
+	private final UUID id;
+	private final String name;
+	
+	public ChatComponentEntity(String type, UUID id, String name) {
+		this.type = type;
+		this.id = id;
+		this.name = name;
+	}
+
+	@Override
+	public String toRawText() {
+		return toString();
+	}
+	
+	@Override
+	public String toString() {
+		return String.format("{\"type\":\"%s\",\"id\":\"%s\",\"name\":{\"text\":\"%s\"}}", type, id, name);
+	}
+	
+	public JsonObject toJson() {
+		JsonObject json = new JsonObject();
+		json.addProperty("type", type);
+		json.addProperty("id", id.toString());
+		JsonObject json2 = new JsonObject();
+		json2.addProperty("text", name);
+		json.add("name", json2);
+		return json;
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/ChatHoverable.java

@@ -0,0 +1,57 @@
+package me.neznamy.tab.api.chat;
+
+import me.neznamy.tab.api.util.Preconditions;
+
+/**
+ * Class for hover event action in chat component
+ */
+public class ChatHoverable {
+
+	/** Hover action */
+	private final EnumHoverAction action;
+
+	/** Hover value */
+	private final IChatBaseComponent value;
+
+	/**
+	 * Constructs new instance with given action and value.
+	 * @param	action
+	 * 			hover event action
+	 * @param	value
+	 * 			hover event value
+	 * @throws	IllegalArgumentException
+	 * 			if {@code action} is null or {@code value} is null
+	 */
+	public ChatHoverable(EnumHoverAction action, IChatBaseComponent value) {
+		Preconditions.checkNotNull(action, "hover action cannot be null");
+		Preconditions.checkNotNull(value, "hover value cannot be null");
+		this.action = action;
+		this.value = value;
+	}
+
+	/**
+	 * Returns hover action defined in constructor
+	 * @return	hover action
+	 */
+	public EnumHoverAction getAction() {
+		return action;
+	}
+
+	/**
+	 * Returns hover value defined in constructor
+	 * @return	hover value
+	 */
+	public IChatBaseComponent getValue() {
+		return value;
+	}
+
+	/**
+	 * Enum for all possible hover actions
+	 */
+	public enum EnumHoverAction {
+
+		SHOW_TEXT,
+		SHOW_ITEM,
+		SHOW_ENTITY
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/ChatModifier.java

@@ -0,0 +1,281 @@
+package me.neznamy.tab.api.chat;
+
+import java.util.UUID;
+
+import org.json.simple.JSONObject;
+
+import me.neznamy.tab.api.ProtocolVersion;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.chat.ChatClickable.EnumClickAction;
+import me.neznamy.tab.api.chat.ChatHoverable.EnumHoverAction;
+
+public class ChatModifier {
+
+	private TextColor color;
+
+	private Boolean bold;
+	private Boolean italic;
+	private Boolean underlined;
+	private Boolean strikethrough;
+	private Boolean obfuscated;
+
+	private ChatClickable clickEvent;
+	private ChatHoverable hoverEvent;
+	
+	private String font;
+	
+	private ProtocolVersion targetVersion;
+	
+	public ChatModifier() {
+	}
+	
+	public ChatModifier(ChatModifier modifier) {
+		this.color = modifier.color == null ? null : new TextColor(modifier.color);
+		this.bold = modifier.bold;
+		this.italic = modifier.italic;
+		this.underlined = modifier.underlined;
+		this.strikethrough = modifier.strikethrough;
+		this.obfuscated = modifier.obfuscated;
+		this.clickEvent = modifier.clickEvent == null ? null : new ChatClickable(modifier.clickEvent.getAction(), modifier.clickEvent.getValue());
+		this.hoverEvent = modifier.hoverEvent == null ? null : new ChatHoverable(modifier.hoverEvent.getAction(), modifier.hoverEvent.getValue());
+		this.font = modifier.font;
+		this.targetVersion = modifier.targetVersion;
+	}
+
+	public TextColor getColor() {
+		return color;
+	}
+	
+	public void setColor(TextColor color) {
+		this.color = color;
+	}
+
+	public Boolean getBold() {
+		return bold;
+	}
+
+	public void setBold(Boolean bold) {
+		this.bold = bold;
+	}
+
+	public Boolean getItalic() {
+		return italic;
+	}
+
+	public void setItalic(Boolean italic) {
+		this.italic = italic;
+	}
+
+	public Boolean getUnderlined() {
+		return underlined;
+	}
+
+	public void setUnderlined(Boolean underlined) {
+		this.underlined = underlined;
+	}
+
+	public Boolean getStrikethrough() {
+		return strikethrough;
+	}
+
+	public void setStrikethrough(Boolean strikethrough) {
+		this.strikethrough = strikethrough;
+	}
+
+	public Boolean getObfuscated() {
+		return obfuscated;
+	}
+
+	public void setObfuscated(Boolean obfuscated) {
+		this.obfuscated = obfuscated;
+	}
+	
+	/**
+	 * Returns true if bold is defined and set to true, false otherwise
+	 * @return true if bold is defined and set to true, false otherwise
+	 */
+	public boolean isBold(){
+		return Boolean.TRUE.equals(bold);
+	}
+
+	/**
+	 * Returns true if italic is defined and set to true, false otherwise
+	 * @return true if italic is defined and set to true, false otherwise
+	 */
+	public boolean isItalic(){
+		return Boolean.TRUE.equals(italic);
+	}
+
+	/**
+	 * Returns true if underlined is defined and set to true, false otherwise
+	 * @return true if underlined is defined and set to true, false otherwise
+	 */
+	public boolean isUnderlined(){
+		return Boolean.TRUE.equals(underlined);
+	}
+
+	/**
+	 * Returns true if strikethrough is defined and set to true, false otherwise
+	 * @return true if strikethrough is defined and set to true, false otherwise
+	 */
+	public boolean isStrikethrough(){
+		return Boolean.TRUE.equals(strikethrough);
+	}
+
+	/**
+	 * Returns true if obfuscation is defined and set to true, false otherwise
+	 * @return true if obfuscation is defined and set to true, false otherwise
+	 */
+	public boolean isObfuscated(){
+		return Boolean.TRUE.equals(obfuscated);
+	}
+
+	public ChatClickable getClickEvent() {
+		return clickEvent;
+	}
+
+	public void setClickEvent(ChatClickable clickEvent) {
+		this.clickEvent = clickEvent;
+	}
+
+	public ChatHoverable getHoverEvent() {
+		return hoverEvent;
+	}
+
+	public void setHoverEvent(ChatHoverable hoverEvent) {
+		this.hoverEvent = hoverEvent;
+	}
+	
+	/**
+	 * Sets click action to OPEN_URL and url to given value
+	 * @param url - url to open
+	 */
+	public void onClickOpenUrl(String url) {
+		clickEvent = new ChatClickable(EnumClickAction.OPEN_URL, url);
+	}
+
+	/**
+	 * Sets click action to RUN_COMMAND and command to given value
+	 * @param command - command to perform, might be without / to send a chat message
+	 */
+	public void onClickRunCommand(String command) {
+		clickEvent = new ChatClickable(EnumClickAction.RUN_COMMAND, command);
+	}
+
+	/**
+	 * Sets click action to SUGGEST_COMMAND and command to given value
+	 * @param command - command to suggest
+	 */
+	public void onClickSuggestCommand(String command) {
+		clickEvent = new ChatClickable(EnumClickAction.SUGGEST_COMMAND, command);
+	}
+
+	/**
+	 * Sets click action to CHANGE_PAGE and page id to given value
+	 * @param newPage - id of new page
+	 */
+	public void onClickChangePage(int newPage) {
+		if (TabAPI.getInstance().getServerVersion().getMinorVersion() < 8) throw new UnsupportedOperationException("change_page click action is not supported on <1.8");
+		clickEvent = new ChatClickable(EnumClickAction.CHANGE_PAGE, String.valueOf(newPage));
+	}
+	
+	public void onClick(EnumClickAction action, String value) {
+		clickEvent = new ChatClickable(action, value);
+	}
+
+	/**
+	 * Sets hover action to SHOW_TEXT and text to given value
+	 * @param text - text to show
+	 */
+	public void onHoverShowText(IChatBaseComponent text) {
+		hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_TEXT, text);
+	}
+
+	/**
+	 * Sets hover action to SHOW_ITEM and item to given value
+	 * @param serializedItem - item to show
+	 */
+	public void onHoverShowItem(String serializedItem) {
+		hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_ITEM, new IChatBaseComponent(serializedItem));
+	}
+
+	/**
+	 * Sets hover action to SHOW_ENTITY and entity data to given values
+	 * @param type - entity type
+	 * @param id - entity uuid
+	 * @param name - entity custom name
+	 */
+	public void onHoverShowEntity(String type, UUID id, String name) {
+		if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 16) {
+			hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_ENTITY, new ChatComponentEntity(type, id, name));
+		} else if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 13) {
+			hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_ENTITY, new IChatBaseComponent(String.format("{type:\"%s\",id:\"%s\",name:\"{\\\"text\\\":\\\"%s\\\"}\"}", type, id, name)));
+		} else if (TabAPI.getInstance().getServerVersion().getMinorVersion() == 12) {
+			hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_ENTITY, new IChatBaseComponent(String.format("{type:\"%s\",id:\"%s\",name:\"%s\"}", type, id, name)));
+		} else if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 8) {
+			hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_ENTITY, new IChatBaseComponent(String.format("{type:%s,id:%s,name:%s}", type, id, name)));
+		} else {
+			throw new IllegalStateException("show_entity hover action is not supported on <1.8");
+		}
+	}
+	
+	public void onHover(EnumHoverAction action, IChatBaseComponent value) {
+		hoverEvent = new ChatHoverable(action, value);
+	}
+
+	public String getFont() {
+		return font;
+	}
+
+	public void setFont(String font) {
+		this.font = font;
+	}
+	
+	@SuppressWarnings("unchecked")
+	public JSONObject serialize() {
+		JSONObject json = new JSONObject();
+		if (color != null) json.put("color", targetVersion.getMinorVersion() >= 16 ? color.toString() : color.getLegacyColor().toString().toLowerCase());
+		if (bold != null) json.put("bold", bold);
+		if (italic != null) json.put("italic", italic);
+		if (underlined != null) json.put("underlined", underlined);
+		if (strikethrough != null) json.put("strikethrough", strikethrough);
+		if (obfuscated != null) json.put("obfuscated", obfuscated);
+		if (clickEvent != null) {
+			JSONObject click = new JSONObject();
+			click.put("action", clickEvent.getAction().toString().toLowerCase());
+			click.put("value", clickEvent.getValue());
+			json.put("clickEvent", click);
+		}
+		if (hoverEvent != null) {
+			JSONObject hover = new JSONObject();
+			hover.put("action", hoverEvent.getAction().toString().toLowerCase());
+			if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 16) {
+				hover.put("contents", hoverEvent.getValue());
+			} else {
+				hover.put("value", TabAPI.getInstance().getServerVersion().getMinorVersion() >= 9 ?
+						hoverEvent.getValue() : hoverEvent.getValue().toRawText());
+			}
+			json.put("hoverEvent", hover);
+		}
+		if (font != null) json.put("font", font);
+		return json;
+	}
+	
+	public String getMagicCodes() {
+		StringBuilder builder = new StringBuilder();
+		if (isBold()) builder.append(EnumChatFormat.BOLD.getFormat());
+		if (isItalic()) builder.append(EnumChatFormat.ITALIC.getFormat());
+		if (isUnderlined()) builder.append(EnumChatFormat.UNDERLINE.getFormat());
+		if (isStrikethrough()) builder.append(EnumChatFormat.STRIKETHROUGH.getFormat());
+		if (isObfuscated()) builder.append(EnumChatFormat.OBFUSCATED.getFormat());
+		return builder.toString();
+	}
+	
+	public void setTargetVersion(ProtocolVersion targetVersion) {
+		this.targetVersion = targetVersion;
+	}
+	
+	public ProtocolVersion getTargetVersion() {
+		return targetVersion;
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/EnumChatFormat.java

@@ -0,0 +1,242 @@
+package me.neznamy.tab.api.chat;
+
+import me.neznamy.tab.api.chat.rgb.RGBUtils;
+
+/**
+ * An enum containing all possible legacy color codes and magic codes. Also contains handy color-related methods.
+ */
+public enum EnumChatFormat {
+
+	BLACK('0', "000000"),
+	DARK_BLUE('1', "0000AA"),
+	DARK_GREEN('2', "00AA00"),
+	DARK_AQUA('3', "00AAAA"),
+	DARK_RED('4', "AA0000"),
+	DARK_PURPLE('5', "AA00AA"),
+	GOLD('6', "FFAA00"),
+	GRAY('7', "AAAAAA"),
+	DARK_GRAY('8', "555555"),
+	BLUE('9', "5555FF"),
+	GREEN('a', "55FF55"),
+	AQUA('b', "55FFFF"),
+	RED('c', "FF5555"),
+	LIGHT_PURPLE('d', "FF55FF"),
+	YELLOW('e', "FFFF55"),
+	WHITE('f', "FFFFFF"),
+	OBFUSCATED('k'),
+	BOLD('l'),
+	STRIKETHROUGH('m'),
+	UNDERLINE('n'),
+	ITALIC('o'),
+	RESET('r');
+
+	/** The symbol minecraft uses to colorize text */
+	public static final char COLOR_CHAR = 0x00a7;
+
+	/** The color symbol in form of a string */
+	public static final String COLOR_STRING = String.valueOf(COLOR_CHAR);
+
+	/** Character representing the color or magic code */
+	private final char character;
+	
+	/** Red value of this constant, 0 for magic codes */
+	private final short red;
+
+	/** Green value of this constant, 0 for magic codes */
+	private final short green;
+
+	/** Blue value of this constant, 0 for magic codes */
+	private final short blue;
+	
+	/** Color as 6-digit hex code, null for magic codes */
+	private final String hexCode;
+	
+	/** Color symbol followed by constant's character */
+	private final String chatFormat;
+
+	/**
+	 * Constructs new color instance with given character and hex code
+	 * @param	character
+	 * 			character which the color goes by
+	 * @param	hexCode
+	 * 			6-digit hex code of the color
+	 */
+	EnumChatFormat(char character, String hexCode) {
+		this.character = character;
+		this.chatFormat = String.valueOf(COLOR_CHAR) + character;
+		this.hexCode = hexCode;
+		int hexColor = Integer.parseInt(hexCode, 16);
+		red = (short) ((hexColor >> 16) & 0xFF);
+		green = (short) ((hexColor >> 8) & 0xFF);
+		blue = (short) (hexColor & 0xFF);
+	}
+	
+	/**
+	 * Constructs new magic code instance with given character
+	 * @param	character
+	 * 			character representing the magic code
+	 */
+	EnumChatFormat(char character) {
+		this.character = character;
+		this.chatFormat = String.valueOf(COLOR_CHAR) + character;
+		red = 0;
+		green = 0;
+		blue = 0;
+		hexCode = null;
+	}
+
+	/**
+	 * Returns red value of this color code
+	 * @return	red value
+	 */
+	public short getRed() {
+		return red;
+	}
+	
+	/**
+	 * Returns green value of this color code
+	 * @return	green value
+	 */
+	public short getGreen() {
+		return green;
+	}
+	
+	/**
+	 * Returns blue value of this color code
+	 * @return	blue value
+	 */
+	public short getBlue() {
+		return blue;
+	}
+	
+	/**
+	 * Returns enum value based on provided character or null if character is not valid
+	 * @param	c
+	 * 			color code character (0-9, a-f, k-o, r)
+	 * @return	instance from the character or null if character is not valid
+	 */
+	public static EnumChatFormat getByChar(char c) {
+		for (EnumChatFormat format : values()) {
+			if (format.character == c) return format;
+		}
+		return null;
+	}
+	
+	/**
+	 * Returns enum value of last colors used in given string.
+	 * If it's null, empty or does not contain color codes, WHITE is returned.
+	 * @param	string
+	 * 			string to check last colors of
+	 * @return	last used color code in given string or WHITE if nothing is found
+	 */
+	public static EnumChatFormat lastColorsOf(String string) {
+		if (string == null || string.length() == 0) return EnumChatFormat.WHITE;
+		String legacyText = RGBUtils.getInstance().convertRGBtoLegacy(string);
+		String last = getLastColors(legacyText);
+		if (last.length() > 0) {
+			char c = last.toCharArray()[1];
+			for (EnumChatFormat e : values()) {
+				if (e.character == c) return e;
+			}
+		}
+		return EnumChatFormat.WHITE;
+	}
+	
+	/**
+	 * Returns color char followed by color's character
+	 * @return color char followed by color's character
+	 */
+	public String getFormat() {
+		return chatFormat;
+	}
+	
+	/**
+	 * Returns character representing this color
+	 * @return character representing this color
+	 */
+	public char getCharacter() {
+		return character;
+	}
+	
+	/**
+	 * Returns hex code of this format, null if this is a magic code
+	 * @return hex code of this format
+	 */
+	public String getHexCode() {
+		return hexCode;
+	}
+	
+	/**
+	 * Returns enum value with exact red, green and blue values or null if no match was found
+	 * @param	red
+	 * 			exact red value
+	 * @param	green
+	 * 			exact green value
+	 * @param	blue
+	 * 			exact blue value
+	 * @return	enum value or null if no such combination exists
+	 */
+	public static EnumChatFormat fromRGBExact(int red, int green, int blue){
+		for (EnumChatFormat format : values()) {
+			if (format.red == red && format.green == green && format.blue == blue) return format;
+		}
+		return null;
+	}
+
+	/**
+	 * Color translation method taken from bukkit, which converts '&' symbol into
+	 * the actual color character if followed by a valid color character.
+	 * @param	textToTranslate
+	 * 			text to replace color symbol in
+	 * @return	colorized string from provided text
+	 */
+	public static String color(String textToTranslate){
+		if (textToTranslate == null) return null;
+		if (!textToTranslate.contains("&")) return textToTranslate;
+		char[] b = textToTranslate.toCharArray();
+		for (int i = 0; i < b.length - 1; i++) {
+			if ((b[i] == '&') && ("0123456789AaBbCcDdEeFfKkLlMmNnOoRrXx".indexOf(b[(i + 1)]) > -1)){
+				b[i] = COLOR_CHAR;
+				b[(i + 1)] = Character.toLowerCase(b[(i + 1)]);
+			}
+		}
+		return new String(b);
+	}
+
+	/**
+	 * Turns back the color symbol into '&' symbol in provided text.
+	 * @param	text
+	 * 			text to revert colors in
+	 * @return	reverted text
+	 */
+	public static String decolor(String text) {
+		if (text == null) return null;
+		if (!text.contains(COLOR_STRING)) return text;
+		return text.replace(COLOR_CHAR, '&');
+	}
+
+	/**
+	 * Code taken from bukkit, which returns last color codes used in provided text.
+	 * @param	input
+	 * 			text to get last colors from
+	 * @return	last colors used in provided text or empty string if nothing was found
+	 */
+	public static String getLastColors(String input) {
+		StringBuilder result = new StringBuilder();
+		int length = input.length();
+		for (int index = length - 1; index > -1; index--){
+			char section = input.charAt(index);
+			if ((section == COLOR_CHAR || section == '&') && (index < length - 1)){
+				char c = input.charAt(index + 1);
+				if ("0123456789AaBbCcDdEeFfKkLlMmNnOoRr".contains(String.valueOf(c))) {
+					result.insert(0, COLOR_CHAR);
+					result.insert(1, c);
+					if ("0123456789AaBbCcDdEeFfRr".contains(String.valueOf(c))) {
+						break;
+					}
+				}
+			}
+		}
+		return result.toString();
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/IChatBaseComponent.java

@@ -0,0 +1,441 @@
+package me.neznamy.tab.api.chat;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+
+import me.neznamy.tab.api.ProtocolVersion;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.chat.ChatClickable.EnumClickAction;
+import me.neznamy.tab.api.chat.ChatHoverable.EnumHoverAction;
+import me.neznamy.tab.api.chat.rgb.RGBUtils;
+
+/**
+ * A class representing the n.m.s.IChatBaseComponent class to make work with it much easier
+ */
+@SuppressWarnings("unchecked")
+public class IChatBaseComponent {
+
+	private static final Map<String, IChatBaseComponent> componentCache = new HashMap<>();
+	private static final Map<IChatBaseComponent, String> serializeCacheModern = new HashMap<>();
+	private static final Map<IChatBaseComponent, String> serializeCacheLegacy = new HashMap<>();
+	
+	//constants
+	private static final String EMPTY_TRANSLATABLE = "{\"translate\":\"\"}";
+	private static final String EMPTY_TEXT = "{\"text\":\"\"}";
+	private static final List<IChatBaseComponent> EMPTY_LIST = new ArrayList<>(0);
+
+	//component text
+	private String text;
+	
+	private ChatModifier modifier = new ChatModifier();
+
+	//extra components
+	private List<IChatBaseComponent> extra;
+
+	/**
+	 * Constructs a new empty component
+	 */
+	public IChatBaseComponent() {
+	}
+	
+	/**
+	 * Constructs a new component which is a clone of provided component
+	 * @param component - component to clone
+	 */
+	public IChatBaseComponent(IChatBaseComponent component) {
+		this.text = component.text;
+		this.modifier = new ChatModifier(component.modifier);
+		for (IChatBaseComponent child : component.getExtra()) {
+			addExtra(new IChatBaseComponent(child));
+		}
+	}
+
+	/**
+	 * Constructs new instance with given text
+	 * @param text - text to display
+	 */
+	public IChatBaseComponent(String text) {
+		this.text = text;
+	}
+
+	/**
+	 * Returns list of extra components or null if none are defined
+	 * @return list of extras
+	 */
+	public List<IChatBaseComponent> getExtra(){
+		if (extra == null) return EMPTY_LIST;
+		return extra;
+	}
+
+	/**
+	 * Sets full list of extra components to given list
+	 * @param components - components to use as extra
+	 * @return self
+	 */
+	public IChatBaseComponent setExtra(List<IChatBaseComponent> components){
+		if (components.isEmpty()) throw new IllegalArgumentException("Unexpected empty array of components"); //exception taken from minecraft
+		this.extra = components;
+		return this;
+	}
+
+	/**
+	 * Appends provided component as extra component
+	 * @param child - component to append
+	 * @return self
+	 */
+	public IChatBaseComponent addExtra(IChatBaseComponent child) {
+		if (extra == null) extra = new ArrayList<>();
+		extra.add(child);
+		return this;
+	}
+
+	/**
+	 * Returns text of this component
+	 * @return text of this component
+	 */
+	public String getText() {
+		return text;
+	}
+
+	public ChatModifier getModifier() {
+		return modifier;
+	}
+	
+	public void setModifier(ChatModifier modifier) {
+		this.modifier = modifier;
+	}
+
+	/**
+	 * Sets text of this component
+	 * @param text - text to show
+	 * @return self
+	 */
+	public IChatBaseComponent setText(String text) {
+		this.text = text;
+		return this;
+	}
+
+	/**
+	 * Deserializes string and returns created component
+	 * @param json - serialized string
+	 * @return Deserialized component
+	 */
+	public static IChatBaseComponent deserialize(String json) {
+		try {
+			if (json == null) return null;
+			if (json.startsWith("\"") && json.endsWith("\"") && json.length() > 1) {
+				//simple component with only text used, minecraft serializer outputs the text in quotes instead of full json
+				return new IChatBaseComponent(json.substring(1, json.length()-1));
+			}
+			JSONObject jsonObject = (JSONObject) new JSONParser().parse(json);
+			IChatBaseComponent component;
+			if (jsonObject.containsKey("type")) {
+				return new ChatComponentEntity((String) jsonObject.get("type"), UUID.fromString((String) jsonObject.get("id")), IChatBaseComponent.deserialize(jsonObject.get("name").toString()).toFlatText());
+			}
+			component = new IChatBaseComponent();
+			component.setText((String) jsonObject.get("text"));
+			component.modifier.setBold(getBoolean(jsonObject, "bold"));
+			component.modifier.setItalic(getBoolean(jsonObject, "italic"));
+			component.modifier.setUnderlined(getBoolean(jsonObject, "underlined"));
+			component.modifier.setStrikethrough(getBoolean(jsonObject, "strikethrough"));
+			component.modifier.setObfuscated(getBoolean(jsonObject, "obfuscated"));
+			component.modifier.setColor(TextColor.fromString(((String) jsonObject.get("color"))));
+			if (jsonObject.containsKey("clickEvent")) {
+				JSONObject clickEvent = (JSONObject) jsonObject.get("clickEvent");
+				String action = (String) clickEvent.get("action");
+				String value = clickEvent.get("value").toString();
+				component.modifier.onClick(EnumClickAction.valueOf(action.toUpperCase()), value);
+			}
+			if (jsonObject.containsKey("hoverEvent")) {
+				JSONObject hoverEvent = (JSONObject) jsonObject.get("hoverEvent");
+				String action = (String) hoverEvent.get("action");
+				String value = (String) hoverEvent.get("value");
+				component.modifier.onHover(EnumHoverAction.valueOf(action.toUpperCase()), deserialize(value));
+			}
+			if (jsonObject.containsKey("extra")) {
+				List<Object> list = (List<Object>) jsonObject.get("extra");
+				for (Object extra : list) {
+					String string = extra.toString();
+					//reverting .toString() removing "" for simple text
+					if (!string.startsWith("{")) string = "\"" + string + "\"";
+					component.addExtra(deserialize(string));
+				}
+			}
+			return component;
+		} catch (Exception e) {
+			TabAPI.getInstance().logError("Failed to deserialize json component " + json, e);
+			return null;
+		}
+	}
+
+	/**
+	 * Returns boolean value of requested key
+	 * @param jsonObject - object to get value from
+	 * @param key - name of key
+	 * @return value from json object or null if not present
+	 */
+	private static Boolean getBoolean(JSONObject jsonObject, String key) {
+		String value = String.valueOf(jsonObject.getOrDefault(key, null));
+		return "null".equals(value) ? null : Boolean.parseBoolean(value);
+	}
+
+	@Override
+	public String toString() {
+		JSONObject json = new JSONObject();
+		if (text != null) json.put("text", text);
+		if (modifier.getTargetVersion() == null) modifier.setTargetVersion(TabAPI.getInstance().getServerVersion()); //packet.toString() was called as a part of a debug message
+		json.putAll(modifier.serialize());
+		if (extra != null) json.put("extra", extra);
+		return json.toString();
+	}
+
+	/**
+	 * Serializes this component with colors based on client version
+	 * @param clientVersion - client version
+	 * @return Serialized string
+	 */
+	public String toString(ProtocolVersion clientVersion) {
+		return toString(clientVersion, false);
+	}
+
+	/**
+	 * Serializes this component with colors based on client version
+	 * @param clientVersion - client version
+	 * @param sendTranslatableIfEmpty - if empty translatable should be sent if text is empty or not
+	 * @return Serialized string
+	 */
+	public String toString(ProtocolVersion clientVersion, boolean sendTranslatableIfEmpty) {
+		if (extra == null) {
+			if (text == null) return null;
+			if (text.length() == 0) {
+				if (sendTranslatableIfEmpty) {
+					return EMPTY_TRANSLATABLE;
+				} else {
+					return EMPTY_TEXT;
+				}
+			}
+		}
+		modifier.setTargetVersion(clientVersion);
+		for (IChatBaseComponent child : getExtra()) {
+			child.modifier.setTargetVersion(clientVersion);
+		}
+		String string;
+		if (clientVersion.getMinorVersion() >= 16) {
+			if (serializeCacheModern.containsKey(this)) return serializeCacheModern.get(this);
+			string = toString();
+			if (serializeCacheModern.size() > 10000) serializeCacheModern.clear();
+			serializeCacheModern.put(this, string);
+		} else {
+			if (serializeCacheLegacy.containsKey(this)) return serializeCacheLegacy.get(this);
+			string = toString();
+			if (serializeCacheLegacy.size() > 10000) serializeCacheLegacy.clear();
+			serializeCacheLegacy.put(this, string);
+		}
+		return string;
+	}
+
+	/**
+	 * Returns organized component from colored text
+	 * @param originalText - text to convert
+	 * @return organized component from colored text
+	 */
+	public static IChatBaseComponent fromColoredText(String originalText){
+		String text = RGBUtils.getInstance().applyFormats(EnumChatFormat.color(originalText), false);
+		List<IChatBaseComponent> components = new ArrayList<>();
+		StringBuilder builder = new StringBuilder();
+		IChatBaseComponent component = new IChatBaseComponent();
+		for (int i = 0; i < text.length(); i++){
+			char c = text.charAt(i);
+			if (c == EnumChatFormat.COLOR_CHAR){
+				i++;
+				if (i >= text.length()) {
+					break;
+				}
+				c = text.charAt(i);
+				if ((c >= 'A') && (c <= 'Z')) {
+					c = (char)(c + ' ');
+				}
+				EnumChatFormat format = EnumChatFormat.getByChar(c);
+				if (format != null){
+					if (builder.length() > 0) {
+						component.setText(builder.toString());
+						components.add(component);
+						component = new IChatBaseComponent(component);
+						component.text = null;
+						builder = new StringBuilder();
+					}
+					switch (format){
+					case BOLD: 
+						component.modifier.setBold(true);
+						break;
+					case ITALIC: 
+						component.modifier.setItalic(true);
+						break;
+					case UNDERLINE: 
+						component.modifier.setUnderlined(true);
+						break;
+					case STRIKETHROUGH: 
+						component.modifier.setStrikethrough(true);
+						break;
+					case OBFUSCATED: 
+						component.modifier.setObfuscated(true);
+						break;
+					case RESET: 
+						component = new IChatBaseComponent();
+						component.modifier.setColor(new TextColor(EnumChatFormat.WHITE));
+						break;
+					default:
+						component = new IChatBaseComponent();
+						component.modifier.setColor(new TextColor(format));
+						break;
+					}
+				}
+			} else if (c == '#' && text.length() > i+6){
+				String hex = text.substring(i+1, i+7);
+				if (RGBUtils.getInstance().isHexCode(hex)) {
+					TextColor color;
+					if (containsLegacyCode(text, i)) {
+						color = new TextColor(hex, EnumChatFormat.getByChar(text.charAt(i+8)));
+						i += 8;
+					} else {
+						color = new TextColor(hex);
+						i += 6;
+					}
+					if (builder.length() > 0){
+						component.setText(builder.toString());
+						components.add(component);
+						builder = new StringBuilder();
+					}
+					component = new IChatBaseComponent();
+					component.modifier.setColor(color);
+				} else {
+					builder.append(c);
+				}
+			} else {
+				builder.append(c);
+			}
+		}
+		component.setText(builder.toString());
+		components.add(component);
+		return new IChatBaseComponent("").setExtra(components);
+	}
+
+	/**
+	 * Returns true if text contains legacy color request at defined RGB index start
+	 * @param text - text to check
+	 * @param i - current index start
+	 * @return true if legacy color is defined, false if not
+	 */
+	private static boolean containsLegacyCode(String text, int i) {
+		if (text.length() - i < 9 || text.charAt(i+7) != '|') return false;
+		return EnumChatFormat.getByChar(text.charAt(i+8)) != null;
+	}
+
+	/**
+	 * Converts this component into a simple text with legacy colors (the closest match if color is set to RGB)
+	 * @return The simple text format
+	 */
+	public String toLegacyText() {
+		StringBuilder builder = new StringBuilder();
+		append(builder, "");
+		return builder.toString();
+	}
+
+	/**
+	 * Appends text to string builder, might also add color and magic codes if different
+	 * from previous component in chain
+	 * @param builder - builder to append text to
+	 * @param previousFormatting - colors and magic codes in previous component
+	 * @return New formatting, might be identical to previous one
+	 */
+	private String append(StringBuilder builder, String previousFormatting) {
+		String formatting = previousFormatting;
+		if (text != null) {
+			formatting = getFormatting();
+			if (!formatting.equals(previousFormatting)) {
+				builder.append(formatting);
+			}
+			builder.append(text);
+
+		}
+		for (IChatBaseComponent component : getExtra()) {
+			formatting = component.append(builder, formatting);
+		}
+		return formatting;
+	}
+
+	/**
+	 * Returns colors and magic codes of this component
+	 * @return used colors and magic codes
+	 */
+	private String getFormatting() {
+		StringBuilder builder = new StringBuilder();
+		if (modifier.getColor() != null) {
+			if (modifier.getColor().getLegacyColor() == EnumChatFormat.WHITE) {
+				//preventing unwanted &r -> &f conversion and stopping the <1.13 client bug fix from working
+				builder.append(EnumChatFormat.RESET.getFormat());
+			} else {
+				builder.append(modifier.getColor().getLegacyColor().getFormat());
+			}
+		}
+		builder.append(modifier.getMagicCodes());
+		return builder.toString();
+	}
+
+	/**
+	 * Returns raw text without colors, only works correctly when component is organized
+	 * @return raw text in this component
+	 */
+	public String toRawText() {
+		StringBuilder builder = new StringBuilder();
+		if (text != null) builder.append(text);
+		for (IChatBaseComponent child : getExtra()) {
+			if (child.text != null) builder.append(child.text);
+		}
+		return builder.toString();
+	}
+
+	/**
+	 * Converts the component into flat text with used colors (including rgb) and magic codes
+	 * @return converted text
+	 */
+	public String toFlatText() {
+		StringBuilder builder = new StringBuilder();
+		if (modifier.getColor() != null) builder.append("#").append(modifier.getColor().getHexCode());
+		builder.append(modifier.getMagicCodes());
+		if (text != null) builder.append(text);
+		for (IChatBaseComponent child : getExtra()) {
+			builder.append(child.toFlatText());
+		}
+		return builder.toString();
+	}
+
+	/**
+	 * Returns the most optimized component based on text. Returns null if text is null,
+	 * organized component if RGB colors are used or simple component with only text field
+	 * containing the whole text when no RGB colors are used
+	 * @param text - text to create component from
+	 * @return The most performance-optimized component based on text
+	 */
+	public static IChatBaseComponent optimizedComponent(String text){
+		if (text == null) return null;
+		if (componentCache.containsKey(text)) return componentCache.get(text);
+		IChatBaseComponent component;
+		if (text.contains("#") || text.contains("&x") || text.contains(EnumChatFormat.COLOR_CHAR + "x")){
+			//contains RGB colors
+			component = IChatBaseComponent.fromColoredText(text);
+		} else {
+			//no RGB
+			component = new IChatBaseComponent(text);
+		}
+		if (componentCache.size() > 10000) componentCache.clear();
+		componentCache.put(text, component);
+		return component;
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/TextColor.java

@@ -0,0 +1,231 @@
+package me.neznamy.tab.api.chat;
+
+import me.neznamy.tab.api.util.Preconditions;
+
+/**
+ * A class representing a component color, which can be either RGB or legacy code.
+ */
+public class TextColor {
+
+	/**
+	 * RGB values from 0 to 255.
+	 * They are only initialized if they are actually used to avoid
+	 * unnecessary memory allocations with string operations.
+	 */
+	private short red = -1;
+	private short green = -1;
+	private short blue = -1;
+	
+	/** Closest legacy color to this color object. */
+	private EnumChatFormat legacyColor;
+	
+	/** HEX code of this color as a 6-digit hexadecimal string without "#" prefix. */
+	private String hexCode;
+	
+	/**
+	 * Boolean value whether the legacy color was forced with constructor or should be
+	 * automatically assigned as closest color.
+	 * This value is used in gradients when converting text for legacy players. */
+	private boolean legacyColorForced;
+
+	/**
+	 * Constructs new instance as a clone of the provided color.
+	 * @param	color
+	 * 			color to create a clone of
+	 * @throws	IllegalArgumentException
+	 * 			if color is {@code null}
+	 */
+	public TextColor(TextColor color) {
+		Preconditions.checkNotNull(color, "color cannot be null");
+		red = color.red;
+		green = color.green;
+		blue = color.blue;
+		legacyColor = color.legacyColor;
+		hexCode = color.hexCode;
+		legacyColorForced = color.legacyColorForced;
+	}
+	
+	/**
+	 * Constructs new instance from provided 6-digit hex code string
+	 * @param	hexCode
+	 * 			a 6-digit combination of hex numbers as a string
+	 * @throws	IllegalArgumentException
+	 * 			if hexCode is {@code null}
+	 */
+	public TextColor(String hexCode) {
+		Preconditions.checkNotNull(hexCode, "hex code cannot be null");
+		this.hexCode = hexCode;
+	}
+	
+	/**
+	 * Constructs new instance from provided 6-digit hex code and forced legacy color
+	 * @param	hexCode
+	 * 			6-digit combination of hex numbers as a string
+	 * @param	legacyColor
+	 * 			color to use for legacy clients instead of using the closest legacy color
+	 * @throws	IllegalArgumentException
+	 * 			if {@code hexCode} is {@code null} or {@code legacyColor} is {@code null}
+	 */
+	public TextColor(String hexCode, EnumChatFormat legacyColor) {
+		Preconditions.checkNotNull(hexCode, "hex code cannot be null");
+		Preconditions.checkNotNull(legacyColor, "legacy color cannot be null");
+		this.hexCode = hexCode;
+		this.legacyColorForced = true;
+		this.legacyColor = legacyColor;
+	}
+	
+	/**
+	 * Constructs new instance from provided legacy color
+	 * @param	legacyColor
+	 * 			legacy color to construct the instance from
+	 * @throws	IllegalArgumentException
+	 * 			if {@code legacyColor} is {@code null}
+	 */
+	public TextColor(EnumChatFormat legacyColor) {
+		Preconditions.checkNotNull(legacyColor, "legacy color cannot be null");
+		this.red = legacyColor.getRed();
+		this.green = legacyColor.getGreen();
+		this.blue = legacyColor.getBlue();
+		this.hexCode = legacyColor.getHexCode();
+	}
+	
+	/**
+	 * Constructs new instance with red, green and blue values
+	 * @param	red
+	 * 			red value
+	 * @param	green
+	 * 			green value
+	 * @param	blue
+	 * 			blue value
+	 * @throws	IllegalArgumentException
+	 * 			if {@code red}, {@code green} or {@code blue} is out of range ({@code 0-255})
+	 */
+	public TextColor(int red, int green, int blue) {
+		Preconditions.checkRange(red, 0, 255);
+		Preconditions.checkRange(green, 0, 255);
+		Preconditions.checkRange(blue, 0, 255);
+		this.red = (short) red;
+		this.green = (short) green;
+		this.blue = (short) blue;
+	}
+	
+	/**
+	 * Loads the closest legacy color based currently provided values
+	 */
+	private EnumChatFormat loadClosestColor() {
+		double minMaxDist = 9999;
+		double maxDist;
+		EnumChatFormat closestColor = EnumChatFormat.WHITE;
+		for (EnumChatFormat color : EnumChatFormat.values()) {
+			int rDiff = Math.abs(color.getRed() - getRed());
+			int gDiff = Math.abs(color.getGreen() - getGreen());
+			int bDiff = Math.abs(color.getBlue() - getBlue());
+			maxDist = rDiff;
+			if (gDiff > maxDist) maxDist = gDiff;
+			if (bDiff > maxDist) maxDist = bDiff;
+			if (maxDist < minMaxDist) {
+				minMaxDist = maxDist;
+				closestColor = color;
+			}
+		}
+		return closestColor;
+	}
+	
+	/**
+	 * Returns {@code red} value
+	 * @return	red value
+	 */
+	public int getRed() {
+		if (red == -1) loadColors();
+		return red;
+	}
+
+	/**
+	 * Returns {@code green} value
+	 * @return	green value
+	 */
+	public int getGreen() {
+		if (green == -1) loadColors();
+		return green;
+	}
+
+	/**
+	 * Returns {@code blue} value
+	 * @return	blue value
+	 */
+	public int getBlue() {
+		if (blue == -1) loadColors();
+		return blue;
+	}
+
+	/**
+	 * Loads red, green and blue values based on current hex code string
+	 */
+	private void loadColors(){
+		int hexColor = Integer.parseInt(hexCode, 16);
+		red = (short) ((hexColor >> 16) & 0xFF);
+		green = (short) ((hexColor >> 8) & 0xFF);
+		blue = (short) (hexColor & 0xFF);
+	}
+	
+	/**
+	 * Returns the closest legacy color of this color object.
+	 * If the color was defined in constructor, it's returned.
+	 * Otherwise, the closest color is calculated the then returned.
+	 * @return	closest legacy color
+	 */
+	public EnumChatFormat getLegacyColor() {
+		if (legacyColor == null) {
+			legacyColor = loadClosestColor();
+		}
+		return legacyColor;
+	}
+	
+	/**
+	 * Returns the rgb combination as a 6-digit hex code string
+	 * @return	the rgb combination as a 6-digit hex code string
+	 */
+	public String getHexCode() {
+		if (hexCode == null) {
+			hexCode = String.format("%06X", (red << 16) + (green << 8) + blue);
+		}
+		return hexCode;
+	}
+	
+	/**
+	 * Converts the color into a valid color value used in color field in chat component.
+	 * That is either 6-digit hex code prefixed with '#', or lowercase legacy color.
+	 * @return	the color serialized for use in chat component
+	 */
+	public String toString() {
+		EnumChatFormat legacyEquivalent = EnumChatFormat.fromRGBExact(getRed(), getGreen(), getBlue());
+		if (legacyEquivalent != null) {
+			//not sending old colors as RGB to 1.16 clients if not needed as <1.16 servers will fail to apply color
+			return legacyEquivalent.toString().toLowerCase();
+		}
+		return "#" + getHexCode();
+	}
+	
+	/**
+	 * Returns true if legacy color was forced with a constructor, false if not
+	 * @return	true if forced, false if not
+	 */
+	public boolean isLegacyColorForced() {
+		return legacyColorForced;
+	}
+
+	/**
+	 * Reads the string as it appears in chat component and turns it into the color object.
+	 * If the entered string is null, returns null.
+	 * If it's prefixed with '#', it's considered as a hex code.
+	 * Otherwise, it is considered being a lowercase legacy color.
+	 * @param	string
+	 * 			string from color field in chat component
+	 * @return	An instance from specified string or null if string is null
+	 */
+	public static TextColor fromString(String string) {
+		if (string == null) return null;
+		if (string.startsWith("#")) return new TextColor(string.substring(1));
+		return new TextColor(EnumChatFormat.valueOf(string.toUpperCase()));
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/rgb/RGBUtils.java

@@ -0,0 +1,183 @@
+package me.neznamy.tab.api.chat.rgb;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.chat.TextColor;
+import me.neznamy.tab.api.chat.rgb.format.BukkitFormat;
+import me.neznamy.tab.api.chat.rgb.format.CMIFormat;
+import me.neznamy.tab.api.chat.rgb.format.HtmlFormat;
+import me.neznamy.tab.api.chat.rgb.format.RGBFormatter;
+import me.neznamy.tab.api.chat.rgb.format.UnnamedFormat1;
+import me.neznamy.tab.api.chat.rgb.gradient.CMIGradient;
+import me.neznamy.tab.api.chat.rgb.gradient.CommonGradient;
+import me.neznamy.tab.api.chat.rgb.gradient.GradientPattern;
+import me.neznamy.tab.api.chat.rgb.gradient.KyoriGradient;
+
+/**
+ * A helper class to reformat all RGB formats into the default #RRGGBB and apply gradients
+ */
+public class RGBUtils {
+
+	/** Instance of the class */
+	private static final RGBUtils instance = new RGBUtils();
+	
+	/** Registered RGB formatters */
+	private final RGBFormatter[] formats;
+	
+	/** Registered gradient patterns */
+	private final GradientPattern[] gradients;
+	
+	/** TAB's RGB pattern, used to convert text to bukkit format for boss bar */
+	private final Pattern tabPattern = Pattern.compile("#[0-9a-fA-F]{6}");
+
+	/** RGB pattern for legacy codes */
+	private final Pattern tabPatternLegacy = Pattern.compile("#[0-9a-fA-F]{6}\\|.");
+
+	/**
+	 * Constructs new instance and loads all RGB patterns and gradients
+	 */
+	public RGBUtils() {
+		formats = new RGBFormatter[] {
+				new BukkitFormat(),
+				new CMIFormat(),
+				new UnnamedFormat1(),
+				new HtmlFormat()
+		};
+		gradients = new GradientPattern[] {
+				//{#RRGGBB>}text{#RRGGBB<}
+				new CMIGradient(),
+				//<#RRGGBB>Text</#RRGGBB>
+				new CommonGradient(Pattern.compile("<#[0-9a-fA-F]{6}>[^<]*</#[0-9a-fA-F]{6}>"), 
+						Pattern.compile("<#[0-9a-fA-F]{6}\\|.>[^<]*</#[0-9a-fA-F]{6}>"), 
+						"<#", 9, 2, 9, 7),
+				//<$#RRGGBB>Text<$#RRGGBB>
+				new CommonGradient(Pattern.compile("<\\$#[0-9a-fA-F]{6}>[^<]*<\\$#[0-9a-fA-F]{6}>"), 
+						Pattern.compile("<\\$#[0-9a-fA-F]{6}\\|.>[^<]*<\\$#[0-9a-fA-F]{6}>"), 
+						"<$", 10, 3, 10, 7),
+				new KyoriGradient()
+		};
+	}
+	
+	/**
+	 * Returns instance of this class
+	 * @return	instance
+	 */
+	public static RGBUtils getInstance() {
+		return instance;
+	}
+	
+	/**
+	 * Applies all RGB formats and gradients to text and returns it.
+	 * This method is called on every property initialization to convert formats
+	 * once instead of on every refresh, if possible. Because of that, parameter
+	 * {@code ignorePlaceholders} exists to not break raw placeholder identifiers
+	 * @param	text
+	 * 			original text
+	 * @param	ignorePlaceholders
+	 * 			whether placeholders should be ignored or not
+	 * @return	text where everything is converted to #RRGGBB
+	 */
+	public String applyFormats(String text, boolean ignorePlaceholders) {
+		String replaced = text;
+		for (GradientPattern pattern : gradients) {
+			replaced = pattern.applyPattern(replaced, ignorePlaceholders);
+		}
+		for (RGBFormatter formatter : formats) {
+			replaced = formatter.reformat(replaced);
+		}
+		return replaced;
+	}
+
+	/**
+	 * Converts TAB's RGB format (#RRGGBB) into bukkit one (&x&r&r&g&g&b&b)
+	 * for modern clients (1.16+), for legacy clients it will use the closest color.
+	 * @param	text
+	 * 			text to convert
+	 * @param	rgbClient
+	 * 			whether client accepts RGB or not
+	 * @return	converted text
+	 */
+	public String convertToBukkitFormat(String text, boolean rgbClient) {
+		if (text == null) return null;
+		if (!text.contains("#")) return text; //no rgb codes
+		if (rgbClient) {
+			//converting random formats to TAB one
+			String replaced = applyFormats(text, false);
+			for (Pattern p : new Pattern[]{tabPatternLegacy, tabPattern}) {
+				Matcher m = p.matcher(replaced);
+				while (m.find()) {
+					String hexCode = m.group();
+					String fixed = "&x&" + hexCode.charAt(1) + "&" + hexCode.charAt(2) + "&" + hexCode.charAt(3) + "&" + hexCode.charAt(4) + "&" + hexCode.charAt(5) + "&" + hexCode.charAt(6);
+					replaced = replaced.replace(hexCode, EnumChatFormat.color(fixed));
+				}
+			}
+			return replaced;
+		} else {
+			return convertRGBtoLegacy(text);
+		}
+	}
+
+	/**
+	 * Converts all hex codes in given string to legacy codes
+	 * @param	text
+	 * 			text to convert
+	 * @return	translated text
+	 */
+	public String convertRGBtoLegacy(String text) {
+		if (text == null) return null;
+		if (!text.contains("#")) return EnumChatFormat.color(text);
+		String applied = applyFormats(text, false);
+		StringBuilder sb = new StringBuilder();
+		for (int i = 0; i < applied.length(); i++){
+			char c = applied.charAt(i);
+			if (c == '#' && applied.length() > i+6) {
+				String hexCode = applied.substring(i+1, i+7);
+				if (isHexCode(hexCode)) {
+					if (containsLegacyCode(applied, i)) {
+						sb.append(new TextColor(hexCode, EnumChatFormat.getByChar(applied.charAt(i+8))).getLegacyColor().getFormat());
+						i += 8;
+					} else {
+						sb.append(new TextColor(hexCode).getLegacyColor().getFormat());
+						i += 6;
+					}
+				} else {
+					sb.append(c);
+				}
+			} else {
+				sb.append(c);
+			}
+		}
+		return sb.toString();
+	}
+
+	/**
+	 * Returns true if entered string is a valid 6-digit combination of
+	 * hexadecimal numbers, false if not
+	 * @param	string
+	 * 			string to check
+	 * @return	{@code true} if valid, {@code false} if not
+	 */
+	public boolean isHexCode(String string) {
+		if (string.length() != 6) return false;
+		for (int i=0; i<6; i++) {
+			char c = string.charAt(i);
+			if (c < 48 || (c > 57 && c < 65) || (c > 70 && c < 97) || c > 102) return false;
+		}
+		return true;
+	}
+	
+	/**
+	 * Returns true if text contains legacy color request at defined RGB index start
+	 * @param	text
+	 * 			text to check
+	 * @param	i
+	 * 			current index start
+	 * @return	{@code true} if legacy color is defined and valid, {@code false} otherwise
+	 */
+	private static boolean containsLegacyCode(String text, int i) {
+		if (text.length() - i < 9 || text.charAt(i+7) != '|') return false;
+		return EnumChatFormat.getByChar(text.charAt(i+8)) != null;
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/rgb/format/BukkitFormat.java

@@ -0,0 +1,27 @@
+package me.neznamy.tab.api.chat.rgb.format;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import me.neznamy.tab.api.chat.EnumChatFormat;
+
+/**
+ * Formatter for &x&R&R&G&G&B&B
+ */
+public class BukkitFormat implements RGBFormatter {
+
+	private final Pattern pattern = Pattern.compile("[" + EnumChatFormat.COLOR_CHAR + "&]x[[" + EnumChatFormat.COLOR_CHAR + "&]\\p{XDigit}]{12}");
+	
+	@Override
+	public String reformat(String text) {
+		if (!text.contains("&") && !text.contains(EnumChatFormat.COLOR_CHAR + "x")) return text;
+		String replaced = text;
+		Matcher m = pattern.matcher(replaced);
+		while (m.find()) {
+			String hexCode = m.group();
+			String fixed = new String(new char[] {'#', hexCode.charAt(3), hexCode.charAt(5), hexCode.charAt(7), hexCode.charAt(9), hexCode.charAt(11), hexCode.charAt(13)});
+			replaced = replaced.replace(hexCode, fixed);
+		}
+		return replaced;
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/rgb/format/CMIFormat.java

@@ -1,4 +1,4 @@
-package me.neznamy.tab.shared.rgb.format;
+package me.neznamy.tab.api.chat.rgb.format;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -6,9 +6,8 @@ import java.util.regex.Pattern;
 /**
  * Formatter for {#RRGGBB}
  */
-public class CMIFormat extends RGBFormatter {
+public class CMIFormat implements RGBFormatter {
 
-	//pattern for {#RRGGBB}
 	private final Pattern pattern = Pattern.compile("\\{#[0-9a-fA-F]{6}\\}");
 	
 	@Override
@@ -17,9 +16,9 @@ public class CMIFormat extends RGBFormatter {
 		String replaced = text;
 		Matcher m = pattern.matcher(replaced);
 		while (m.find()) {
-			String hexcode = m.group();
-			String fixed = hexcode.substring(2, 8);
-			replaced = replaced.replace(hexcode, "#" + fixed);
+			String hexCode = m.group();
+			String fixed = hexCode.substring(2, 8);
+			replaced = replaced.replace(hexCode, "#" + fixed);
 		}
 		return replaced;
 	}

api/src/main/java/me/neznamy/tab/api/chat/rgb/format/HtmlFormat.java

@@ -1,4 +1,4 @@
-package me.neznamy.tab.shared.rgb.format;
+package me.neznamy.tab.api.chat.rgb.format;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -6,9 +6,8 @@ import java.util.regex.Pattern;
 /**
  * Formatter for #<RRGGBB>
  */
-public class HtmlFormat extends RGBFormatter {
+public class HtmlFormat implements RGBFormatter {
 
-	//pattern for #<RRGGBB>
 	private final Pattern pattern = Pattern.compile("#<[0-9a-fA-F]{6}>");
 	
 	@Override
@@ -17,9 +16,9 @@ public class HtmlFormat extends RGBFormatter {
 		Matcher m = pattern.matcher(text);
 		String replaced = text;
 		while (m.find()) {
-			String hexcode = m.group();
-			String fixed = hexcode.substring(2, 8);
-			replaced = replaced.replace(hexcode, "#" + fixed);
+			String hexCode = m.group();
+			String fixed = hexCode.substring(2, 8);
+			replaced = replaced.replace(hexCode, "#" + fixed);
 		}
 		return replaced;
 	}

api/src/main/java/me/neznamy/tab/api/chat/rgb/format/RGBFormatter.java

@@ -1,14 +1,14 @@
-package me.neznamy.tab.shared.rgb.format;
+package me.neznamy.tab.api.chat.rgb.format;
 
 /**
  * Abstract class for different RGB patterns
  */
-public abstract class RGBFormatter {
+public interface RGBFormatter {
 
 	/**
 	 * Reformats RGB codes in provided text into #RRGGBB format
 	 * @param text - text to format
 	 * @return reformatted text
 	 */
-	public abstract String reformat(String text);
+	String reformat(String text);
 }

api/src/main/java/me/neznamy/tab/api/chat/rgb/format/UnnamedFormat1.java

@@ -1,9 +1,9 @@
-package me.neznamy.tab.shared.rgb.format;
+package me.neznamy.tab.api.chat.rgb.format;
 
 /**
  * Formatter for &#RRGGBB
  */
-public class UnnamedFormat1 extends RGBFormatter {
+public class UnnamedFormat1 implements RGBFormatter {
 
 	@Override
 	public String reformat(String text) {

api/src/main/java/me/neznamy/tab/api/chat/rgb/gradient/CMIGradient.java

@@ -0,0 +1,30 @@
+package me.neznamy.tab.api.chat.rgb.gradient;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class CMIGradient extends CommonGradient {
+
+	//pattern for {#RRGGBB<>}
+	private final Pattern shortcutPattern = Pattern.compile("\\{#[0-9a-fA-F]{6}<>\\}");
+	
+	public CMIGradient() {
+		super(Pattern.compile("\\{#[0-9a-fA-F]{6}>\\}[^\\{]*\\{#[0-9a-fA-F]{6}<\\}"), 
+				Pattern.compile("\\{#[0-9a-fA-F]{6}\\|.>\\}[^\\{]*\\{#[0-9a-fA-F]{6}<\\}"), 
+				"{#", 9, 2, 10, 8);
+	}
+	
+	@Override
+	public String applyPattern(String text, boolean ignorePlaceholders) {
+		String replaced = text;
+		if (replaced.contains("<>}")) {
+			Matcher m = shortcutPattern.matcher(replaced);
+			while (m.find()) {
+				String format = m.group();
+				String code = format.substring(2, 8);
+				replaced = replaced.replace(format, "{#" + code + "<}{#" + code + ">}");
+			}
+		}
+		return super.applyPattern(replaced, ignorePlaceholders);
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/rgb/gradient/CommonGradient.java

@@ -0,0 +1,57 @@
+package me.neznamy.tab.api.chat.rgb.gradient;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.chat.TextColor;
+
+public class CommonGradient implements GradientPattern {
+
+	private final Pattern pattern;
+	private final Pattern legacyPattern;
+	private final String containCheck;
+	private final int legacyCharPosition;
+	private final int startColorStart;
+	private final int messageStart;
+	private final int endColorStartSub;
+	
+	public CommonGradient(Pattern pattern, Pattern legacyPattern, String containCheck, int legacyCharPosition,
+			int startColorStart, int messageStart, int endColorStartSub) {
+		this.pattern = pattern;
+		this.legacyPattern = legacyPattern;
+		this.containCheck = containCheck;
+		this.legacyCharPosition = legacyCharPosition;
+		this.startColorStart = startColorStart;
+		this.messageStart = messageStart;
+		this.endColorStartSub = endColorStartSub;
+	}
+	
+	@Override
+	public String applyPattern(String text, boolean ignorePlaceholders) {
+		if (!text.contains(containCheck)) return text;
+		String replaced = text;
+		Matcher m = legacyPattern.matcher(replaced);
+		while (m.find()) {
+			String format = m.group();
+			EnumChatFormat legacyColor = EnumChatFormat.getByChar(format.charAt(legacyCharPosition));
+			if ((ignorePlaceholders && format.contains("%")) || legacyColor == null) continue;
+			TextColor start = new TextColor(format.substring(startColorStart, startColorStart+6), legacyColor);
+			String message = format.substring(messageStart+2, format.length()-10);
+			TextColor end = new TextColor(format.substring(format.length()-endColorStartSub, format.length()-endColorStartSub+6));
+			String applied = asGradient(start, message, end);
+			replaced = replaced.replace(format, applied);
+		}
+		m = pattern.matcher(replaced);
+		while (m.find()) {
+			String format = m.group();
+			if (ignorePlaceholders && format.contains("%")) continue;
+			TextColor start = new TextColor(format.substring(startColorStart, startColorStart+6));
+			String message = format.substring(messageStart, format.length()-10);
+			TextColor end = new TextColor(format.substring(format.length()-endColorStartSub, format.length()-endColorStartSub+6));
+			String applied = asGradient(start, message, end);
+			replaced = replaced.replace(format, applied);
+		}
+		return replaced;
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/rgb/gradient/GradientPattern.java

@@ -0,0 +1,51 @@
+package me.neznamy.tab.api.chat.rgb.gradient;
+
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.chat.TextColor;
+
+/**
+ * Abstract class for applying different gradient patterns
+ */
+public interface GradientPattern {
+
+	/**
+	 * Applies gradients in provided text and returns text using only #RRGGBB
+	 * @param text - text to be reformatted
+	 * @return reformatted text
+	 */
+	String applyPattern(String text, boolean ignorePlaceholders);
+	
+	/**
+	 * Returns gradient text based on start color, text and end color
+	 * @param start - start color
+	 * @param text - text to be reformatted
+	 * @param end - end color
+	 * @return reformatted text
+	 */	
+	default String asGradient(TextColor start, String text, TextColor end) {
+		//lazy support for magic codes in gradients
+		String magicCodes = EnumChatFormat.getLastColors(text);
+		String deColorized = text.substring(magicCodes.length());
+		StringBuilder sb = new StringBuilder();
+		int length = deColorized.length();
+		if (length == 1) {
+			sb.append("#");
+			sb.append(new TextColor(start.getRed(), start.getGreen(), start.getBlue()).getHexCode());
+			if (start.isLegacyColorForced()) sb.append("|").append(start.getLegacyColor().getCharacter());
+			sb.append(magicCodes);
+			sb.append(deColorized);
+			return sb.toString();
+		}
+		for (int i=0; i<length; i++) {
+			int red = (int) (start.getRed() + (float)(end.getRed() - start.getRed())/(length-1)*i);
+			int green = (int) (start.getGreen() + (float)(end.getGreen() - start.getGreen())/(length-1)*i);
+			int blue = (int) (start.getBlue() + (float)(end.getBlue() - start.getBlue())/(length-1)*i);
+			sb.append("#");
+			sb.append(new TextColor(red, green, blue).getHexCode());
+			if (start.isLegacyColorForced()) sb.append("|").append(start.getLegacyColor().getCharacter());
+			sb.append(magicCodes);
+			sb.append(deColorized.charAt(i));
+		}
+		return sb.toString();
+	}
+}

api/src/main/java/me/neznamy/tab/api/chat/rgb/gradient/KyoriGradient.java

@@ -1,35 +1,32 @@
-package me.neznamy.tab.shared.rgb.gradient;
+package me.neznamy.tab.api.chat.rgb.gradient;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import me.neznamy.tab.shared.packets.EnumChatFormat;
-import me.neznamy.tab.shared.rgb.TextColor;
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.chat.TextColor;
 
 /**
- * Gradient applier for <gradient:#RRGGBB:#RRGGBB>Text</gradient>
+ * Gradient applier for <gradient:#RRGGBB:#RRGGBB>Text</gradient> and <gradient:#RRGGBB|L:#RRGGBB>Text</gradient>
  */
-public class KyoriGradient extends GradientPattern {
+public class KyoriGradient implements GradientPattern {
 
-	// <gradient:#RRGGBB:#RRGGBB>Text</gradient>
 	private final Pattern pattern = Pattern.compile("<gradient:#[0-9a-fA-F]{6}:#[0-9a-fA-F]{6}>[^<]*</gradient>");
-	
-	// <gradient:#RRGGBB|L:#RRGGBB>Text</gradient>
-	private final Pattern legacy = Pattern.compile("<gradient:#[0-9a-fA-F]{6}\\|.:#[0-9a-fA-F]{6}>[^<]*</gradient>");
+
+	private final Pattern patternLegacy = Pattern.compile("<gradient:#[0-9a-fA-F]{6}\\|.:#[0-9a-fA-F]{6}>[^<]*</gradient>");
 	
 	@Override
 	public String applyPattern(String text, boolean ignorePlaceholders) {
 		if (!text.contains("<grad")) return text;
 		String replaced = text;
-		Matcher m = legacy.matcher(replaced);
+		Matcher m = patternLegacy.matcher(replaced);
 		while (m.find()) {
 			String format = m.group();
-			if (ignorePlaceholders && format.contains("%")) continue;
 			EnumChatFormat legacyColor = EnumChatFormat.getByChar(format.charAt(18));
-			if (legacyColor == null) continue;
-			TextColor start = new TextColor(format.substring(10, 17), legacyColor);
+			if ((ignorePlaceholders && format.contains("%")) || legacyColor == null) continue;
+			TextColor start = new TextColor(format.substring(11, 17), legacyColor);
 			String message = format.substring(28, format.length()-11);
-			TextColor end = new TextColor(format.substring(20, 27));
+			TextColor end = new TextColor(format.substring(21, 27));
 			String applied = asGradient(start, message, end);
 			replaced = replaced.replace(format, applied);
 		}
@@ -37,9 +34,9 @@ public class KyoriGradient extends GradientPattern {
 		while (m.find()) {
 			String format = m.group();
 			if (ignorePlaceholders && format.contains("%")) continue;
-			TextColor start = new TextColor(format.substring(10, 17));
+			TextColor start = new TextColor(format.substring(11, 17));
 			String message = format.substring(26, format.length()-11);
-			TextColor end = new TextColor(format.substring(18, 25));
+			TextColor end = new TextColor(format.substring(19, 25));
 			String applied = asGradient(start, message, end);
 			replaced = replaced.replace(format, applied);
 		}

api/src/main/java/me/neznamy/tab/api/config/ConfigurationFile.java

@@ -0,0 +1,428 @@
+package me.neznamy.tab.api.config;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import me.neznamy.tab.api.TabAPI;
+
+/**
+ * Abstract class for configuration file
+ */
+@SuppressWarnings("unchecked")
+public abstract class ConfigurationFile {
+
+	/** Comments on top of the file */
+	protected List<String> header;
+
+	/** Configuration file content */
+	protected Map<String, Object> values;
+
+	/** File to use */
+	protected final File file;
+
+	/**
+	 * Constructs new instance and attempts to load specified configuration file.
+	 * If file does not exist, default file is copied from {@code source}.
+	 * 
+	 * @param	source
+	 * 			Source to copy file from if it does not exist
+	 * @param	destination
+	 * 			File destination to use
+	 * @throws	IllegalArgumentException
+	 * 			if {@code destination} is null
+	 * @throws	IllegalStateException
+	 * 			if file does not exist and source is null
+	 * @throws	IOException
+	 * 			if I/O operation with the file unexpectedly fails
+	 */
+	protected ConfigurationFile(InputStream source, File destination) throws IOException {
+		if (destination == null) throw new IllegalArgumentException("Destination cannot be null");
+		this.file = destination;
+		if (file.getParentFile() != null) file.getParentFile().mkdirs();
+		if (!file.exists() && source == null) throw new IllegalStateException("File does not exist and source is null");
+		if (file.createNewFile()) {
+//			Files.copy(source, file.toPath());
+			//avoiding MalformedInputException thrown on fabric due to file not having UTF8 encoding by default
+			//also automatically using the encoding so users don't have to worry about it anymore
+			try (BufferedReader reader = new BufferedReader(new InputStreamReader(source, StandardCharsets.UTF_8));
+				BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), StandardCharsets.UTF_8))){
+				String line;
+				while ((line = reader.readLine()) != null) {
+					writer.write(line + "\n");
+				}
+			}
+		}
+		detectHeader();
+	}
+
+	/**
+	 * Saves values from map to the file
+	 */
+	public abstract void save();
+
+	/**
+	 * Returns simple name of the file
+	 * @return	simple name of the file
+	 */
+	public String getName() {
+		return file.getName();
+	}
+
+	/**
+	 * Returns the root value map
+	 * @return	the root value map
+	 */
+	public Map<String, Object> getValues(){
+		return values;
+	}
+
+	public void setValues(Map<String, Object> values) {
+		this.values = values;
+	}
+
+	/**
+	 * Gets config option with specified path. If the option is not present and 
+	 * {@code defaultValue} is not {@code null}, value is inserted, {@link #save()} 
+	 * called and {@code defaultValue} returned.
+	 * 
+	 * @param	path
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @param	defaultValue
+	 * 			Value to be inserted and returned if option is not present
+	 * @return	value from configuration file
+	 */
+	public Object getObject(String path, Object defaultValue) {
+		Object value = values;
+		for (String section : path.contains(".") ? path.split("\\.") : new String[] {path}) {
+			if (!(value instanceof Map)) {
+				if (defaultValue != null) set(path, defaultValue);
+				return defaultValue;
+			}
+			value = getIgnoreCase((Map<Object, Object>) value, section);
+		}
+		if (value == null && defaultValue != null) {
+			TabAPI.getInstance().debug("Inserting missing config option \"" + path + "\" with value \"" + defaultValue + "\" into " + file.getName());
+			set(path, defaultValue);
+			return defaultValue;
+		}
+		return value;
+	}
+
+	/**
+	 * Returns config option with specified path. If option is not present,
+	 * {@code null} is returned.
+	 * 
+	 * @param	path	
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @return	value from configuration file or null if not present
+	 */
+	public Object getObject(String path) {
+		return getObject(path, null);
+	}
+	
+	public Object getObject(String[] path) {
+		Object value = values;
+		for (String section : path) {
+			if (!(value instanceof Map)) {
+				return null;
+			}
+			value = getIgnoreCase((Map<Object, Object>) value, section);
+		}
+		return value;
+	}
+
+	/**
+	 * Returns value from map without case sensitivity of the key. Returns
+	 * {@code null} if no such key is found.
+	 * 
+	 * @param	map
+	 * 			map to get value from
+	 * @param	key
+	 * 			case-insensitive key name
+	 * @return	map value from case-insensitive key
+	 */
+	private Object getIgnoreCase(Map<Object, Object> map, String key) {
+		for (Entry<Object, Object> entry : map.entrySet()) {
+			if (entry.getKey().toString().equalsIgnoreCase(key)) return entry.getValue();
+		}
+		return map.get(key);
+	}
+
+	/**
+	 * Returns config option with specified path as {@code String}. Returns {@code null} if
+	 * option is not present.
+	 * 
+	 * @param	path	
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @return	value from file or null if not present
+	 */
+	public String getString(String path) {
+		return getString(path, null);
+	}
+
+	/**
+	 * Returns config option with specified path as {@code String}. If the option is not present 
+	 * and {@code defaultValue} is not {@code null}, value is inserted, {@link #save()} called 
+	 * and {@code defaultValue} returned.
+	 * 
+	 * @param	path	
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @param	defaultValue
+	 * 			Value to be inserted and returned if option is not present
+	 * @return	value from configuration file as {@code String}
+	 */
+	public String getString(String path, String defaultValue) {
+		Object value = getObject(path, defaultValue);
+		if (value == null) return defaultValue;
+		return String.valueOf(value);
+	}
+
+	/**
+	 * Returns config option with specified path as {@code List<String>}. Returns {@code null} if
+	 * option is not present.
+	 * 
+	 * @param	path
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @return	value from file or null if not present
+	 */
+	public List<String> getStringList(String path) {
+		return getStringList(path, null);
+	}
+
+	/**
+	 * Returns config option with specified path as {@code List<String>}. If the option is not present 
+	 * and {@code defaultValue} is not {@code null}, value is inserted, {@link #save()} called 
+	 * and {@code defaultValue} returned.
+	 * 
+	 * @param	path	
+	 * 			Path of the option with sections separated with "{@code .}"
+	 * @param	defaultValue
+	 * 			Value to be inserted and returned if option is not present
+	 * @return	value from configuration file as {@code List<String>}
+	 */
+	public List<String> getStringList(String path, List<String> defaultValue) {
+		Object value = getObject(path, defaultValue);
+		if (value == null) return defaultValue;
+		if (!(value instanceof List)) {
+			return new ArrayList<>();
+		}
+		List<String> fixedList = new ArrayList<>();
+		for (Object key : (List<Object>)value) {
+			fixedList.add(key.toString());
+		}
+		return fixedList;
+	}
+
+	/**
+	 * Returns config option with specified path as {@code Integer}. Returns {@code null} if
+	 * option is not present.
+	 * 
+	 * @param	path
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @return	value from file or null if not present
+	 */
+	public Integer getInt(String path) {
+		return getInt(path, null);
+	}
+
+	/**
+	 * Returns config option with specified path as {@code Integer}. If the option is not present 
+	 * and {@code defaultValue} is not {@code null}, value is inserted, {@link #save()} called 
+	 * and {@code defaultValue} returned.
+	 * 
+	 * @param	path	
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @param	defaultValue
+	 * 			Value to be inserted and returned if option is not present
+	 * @return	value from configuration file as {@code Integer}
+	 */
+	public Integer getInt(String path, Integer defaultValue) {
+		Object value = getObject(path, defaultValue);
+		if (value == null) return defaultValue;
+		try{
+			return Integer.parseInt(value.toString());
+		} catch (NumberFormatException e) {
+			return defaultValue;
+		}
+	}
+
+	/**
+	 * Returns config option with specified path as {@code Boolean}. If the option is not present 
+	 * and {@code defaultValue} is not {@code null}, value is inserted, {@link #save()} called 
+	 * and {@code defaultValue} returned.
+	 * 
+	 * @param	path	
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @param	defaultValue
+	 * 			Value to be inserted and returned if option is not present
+	 * @return	value from configuration file as {@code Boolean}
+	 */
+	public boolean getBoolean(String path, boolean defaultValue) {
+		Object value = getObject(path, defaultValue);
+		if (value == null) return defaultValue;
+		return Boolean.parseBoolean(value.toString());
+	}
+
+	/**
+	 * Returns config option with specified path as {@code Double}. If the option is not present 
+	 * and {@code defaultValue} is not {@code null}, value is inserted, {@link #save()} called 
+	 * and {@code defaultValue} returned.
+	 * 
+	 * @param	path	
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @param	defaultValue
+	 * 			Value to be inserted and returned if option is not present
+	 * @return	value from configuration file as {@code Double}
+	 */
+	public Double getDouble(String path, double defaultValue) {
+		Object value = getObject(path, defaultValue);
+		if (value == null) return defaultValue;
+		try {
+			return Double.parseDouble(value.toString());
+		} catch (NumberFormatException e) {
+			return defaultValue;
+		}
+	}
+
+	/**
+	 * Returns config option with specified path as {@code Map<K, V>}. If the option 
+	 * is not present or value is not a {@code Map}, new empty {@code Map} is returned.
+	 * 
+	 * @param	path	
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @return	value from configuration file as {@code Map<K, V>}
+	 */
+	public <K, V> Map<K, V> getConfigurationSection(String path) {
+		if (path == null || path.length() == 0) return (Map<K, V>) values;
+		Object value = getObject(path, null);
+		if (value == null) return new LinkedHashMap<>();
+		if (value instanceof Map) {
+			return (Map<K, V>) value;
+		} else {
+			return new LinkedHashMap<>();
+		}
+	}
+
+	/**
+	 * Returns {@code true} if the file has option with specified path, {@code false}
+	 * if not.
+	 * 
+	 * @param	path
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @return	{@code true} if present, {@code false} if not
+	 */
+	public boolean hasConfigOption(String path) {
+		return getObject(path) != null;
+	}
+
+	/**
+	 * Sets value to the specified path and saves the file to disk by calling {@link #save()}.
+	 * 
+	 * @param	path
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @param	value
+	 * 			Value to save
+	 */
+	public void set(String path, Object value) {
+		set(values, path, value);
+		save();
+	}
+
+	/**
+	 * Sets value to the specified map with specified path and value. This is an internal method
+	 * that correctly creates maps to separate sections using "{@code .}".
+	 * 
+	 * @param	map
+	 * 			Map to insert value to
+	 * @param	path
+	 * 			Path to the option with sections separated with "{@code .}"
+	 * @param	value
+	 * 			Value to save
+	 * @return	the first argument to allow chaining
+	 */
+	private Map<String, Object> set(Map<String, Object> map, String path, Object value) {
+		if (path.contains(".")) {
+			String keyWord = getRealKey(map, path.split("\\.")[0]);
+			Object subMap = map.get(keyWord);
+			if (!(subMap instanceof Map)) {
+				subMap = new LinkedHashMap<>();
+			}
+			map.put(keyWord, set((Map<String, Object>) subMap, path.substring(keyWord.length()+1), value));
+		} else {
+			if (value == null) {
+				map.remove(getRealKey(map, path));
+			} else {
+				map.put(path, value);
+			}
+		}
+		return map;
+	}
+
+	/**
+	 * Returns the real key name without case sensitivity from map. If not found, inserted key
+	 * is returned.
+	 * 
+	 * @param	map
+	 * 			Map to check keys of
+	 * @param	key
+	 * 			Key to find
+	 * @return	The real key name
+	 */
+	private String getRealKey(Map<?, ?> map, String key) {
+		for (Object mapKey : map.keySet()) {
+			if (mapKey.toString().equalsIgnoreCase(key)) return mapKey.toString();
+		}
+		return key;
+	}
+
+	/**
+	 * Detects header of a file (first lines of file starting with #).
+	 *
+	 * @throws	IOException
+	 * 			if I/O operation fails
+	 */
+	private void detectHeader() throws IOException {
+		header = new ArrayList<>();
+		for (String line : Files.readAllLines(file.toPath())) {
+			if (line.startsWith("#")) {
+				header.add(line);
+			} else {
+				break;
+			}
+		}
+	}
+
+	/**
+	 * Inserts header back into file. This is required after calling {@link #save()}, because
+	 * it destroys the header.
+	 * 
+	 * @throws	IOException
+	 * 			if I/O operation fails
+	 */
+	public void fixHeader() throws IOException {
+		if (header == null) return;
+		List<String> content = new ArrayList<>(header);
+		content.addAll(Files.readAllLines(file.toPath()));
+		Files.delete(file.toPath());
+		if (file.createNewFile()) {
+			Files.write(file.toPath(), content);
+		}
+	}
+
+	public File getFile() {
+		return file;
+	}
+}

api/src/main/java/me/neznamy/tab/api/config/YamlConfigurationFile.java

@@ -0,0 +1,87 @@
+package me.neznamy.tab.api.config;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
+import java.nio.charset.StandardCharsets;
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import org.yaml.snakeyaml.DumperOptions;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.error.YAMLException;
+
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.yamlassist.YamlAssist;
+
+/**
+ * YAML implementation of ConfigurationFile
+ */
+public class YamlConfigurationFile extends ConfigurationFile {
+
+	/** SnakeYAML instance */
+	private static final Yaml yaml;
+	
+	static {
+		DumperOptions options = new DumperOptions();
+		options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
+		yaml = new Yaml(options);
+	}
+
+	/**
+	 * Constructs new instance and attempts to load specified configuration file.
+	 * If file does not exist, default file is copied from {@code source}.
+	 * 
+	 * @param	source
+	 * 			Source to copy file from if it does not exist
+	 * @param	destination
+	 * 			File destination to use
+	 * @throws	IllegalArgumentException
+	 * 			if {@code destination} is null
+	 * @throws	IllegalStateException
+	 * 			if file does not exist and source is null
+	 * @throws	YAMLException
+	 * 			if file has invalid YAML syntax
+	 * @throws	IOException
+	 * 			if I/O operation with the file unexpectedly fails
+	 */
+	public YamlConfigurationFile(InputStream source, File destination) throws YAMLException, IOException {
+		super(source, destination);
+		FileInputStream input = null;
+		try {
+			input = new FileInputStream(file);
+			values = yaml.load(input);
+			if (values == null) values = new LinkedHashMap<>();
+			input.close();
+		} catch (YAMLException e) {
+			if (input != null) input.close();
+			TabAPI tab = TabAPI.getInstance();
+			tab.sendConsoleMessage("&c[TAB] File " + destination + " has broken syntax.", true);
+			tab.sendConsoleMessage("&6[TAB] Error message from yaml parser: " + e.getMessage(), true);
+			List<String> suggestions = YamlAssist.getSuggestions(file);
+			if (!suggestions.isEmpty()) {
+				tab.sendConsoleMessage("&d[TAB] Suggestions to fix yaml syntax:", true);
+				for (String suggestion : suggestions) {
+					tab.sendConsoleMessage("&d[TAB] - " + suggestion, true);
+				}
+			}
+			throw e;
+		}
+	}
+
+	@Override
+	public void save() {
+		try {
+			Writer writer = new OutputStreamWriter(new FileOutputStream(file), StandardCharsets.UTF_8);
+			yaml.dump(values, writer);
+			writer.close();
+			fixHeader();
+		} catch (IOException e) {
+			TabAPI.getInstance().sendConsoleMessage("&c[TAB] Failed to save yaml file " + file.getPath() + " with content " + values.toString(), true);
+		}
+	}
+}

api/src/main/java/me/neznamy/tab/api/placeholder/Placeholder.java

@@ -0,0 +1,16 @@
+package me.neznamy.tab.api.placeholder;
+
+public interface Placeholder {
+
+	int getRefresh();
+
+	String getIdentifier();
+
+	boolean isTriggerMode();
+
+	void enableTriggerMode();
+
+	void enableTriggerMode(Runnable onActivation, Runnable onDisable);
+
+	void unload();
+}

api/src/main/java/me/neznamy/tab/api/placeholder/PlaceholderManager.java

@@ -0,0 +1,44 @@
+package me.neznamy.tab.api.placeholder;
+
+import java.util.List;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+import me.neznamy.tab.api.TabFeature;
+import me.neznamy.tab.api.TabPlayer;
+
+public interface PlaceholderManager {
+
+	/**
+	 * Registers a server placeholder (placeholder with same output for all players)
+	 */
+	ServerPlaceholder registerServerPlaceholder(String identifier, int refresh, Supplier<Object> supplier);
+	
+	/**
+	 * Registers a player placeholder (placeholder with player-specific output)
+	 */
+	PlayerPlaceholder registerPlayerPlaceholder(String identifier, int refresh, Function<TabPlayer, Object> function);
+
+	/**
+	 * Registers a relational placeholder (different output for each player pair)
+	 */
+	RelationalPlaceholder registerRelationalPlaceholder(String identifier, int refresh, BiFunction<TabPlayer, TabPlayer, Object> function);
+	
+	/**
+	 * Detects placeholders in text using %% pattern and returns list of all detected identifiers
+	 * @param text - text to detect placeholders in
+	 * @return list of detected identifiers
+	 */
+	List<String> detectPlaceholders(String text);
+
+	/**
+	 * Adds placeholder to list of used placeholders and assigns this feature as using it,
+	 * which will then receive refresh() if values changes
+	 * @param identifier - placeholder identifier
+	 * @param feature - feature using the placeholder
+	 */
+	void addUsedPlaceholder(String identifier, TabFeature feature);
+	
+	String findReplacement(String placeholder, String output);
+}

api/src/main/java/me/neznamy/tab/api/placeholder/PlayerPlaceholder.java

@@ -0,0 +1,10 @@
+package me.neznamy.tab.api.placeholder;
+
+import me.neznamy.tab.api.TabPlayer;
+
+public interface PlayerPlaceholder extends Placeholder {
+
+	void updateValue(TabPlayer player, Object value);
+	
+	Object request(TabPlayer p);
+}

api/src/main/java/me/neznamy/tab/api/placeholder/RelationalPlaceholder.java

@@ -0,0 +1,10 @@
+package me.neznamy.tab.api.placeholder;
+
+import me.neznamy.tab.api.TabPlayer;
+
+public interface RelationalPlaceholder extends Placeholder {
+
+	void updateValue(TabPlayer viewer, TabPlayer target, Object value);
+	
+	Object request(TabPlayer viewer, TabPlayer target);
+}

api/src/main/java/me/neznamy/tab/api/placeholder/ServerPlaceholder.java

@@ -0,0 +1,8 @@
+package me.neznamy.tab.api.placeholder;
+
+public interface ServerPlaceholder extends Placeholder {
+
+	void updateValue(Object value);
+	
+	Object request();
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketBuilder.java

@@ -0,0 +1,240 @@
+package me.neznamy.tab.api.protocol;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import me.neznamy.tab.api.ProtocolVersion;
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.chat.IChatBaseComponent;
+import me.neznamy.tab.api.chat.rgb.RGBUtils;
+import me.neznamy.tab.api.util.BiFunctionWithException;
+
+/**
+ * An interface representing a platform-specific packet builder
+ */
+public abstract class PacketBuilder {
+
+	/** Function map turning custom packet class into platform-specific packets */
+	protected final Map<Class<? extends TabPacket>, BiFunctionWithException<TabPacket, ProtocolVersion, Object>> buildMap = new HashMap<>();
+
+	/**
+	 * Constructs new instance and fills {@link #buildMap} with abstract build methods
+	 * of packets present on all platforms.
+	 */
+	protected PacketBuilder() {
+		buildMap.put(PacketPlayOutBoss.class, (packet, version) -> build((PacketPlayOutBoss)packet, version));
+		buildMap.put(PacketPlayOutChat.class, (packet, version) -> build((PacketPlayOutChat)packet, version));
+		buildMap.put(PacketPlayOutPlayerInfo.class, (packet, version) -> build((PacketPlayOutPlayerInfo)packet, version));
+		buildMap.put(PacketPlayOutPlayerListHeaderFooter.class, (packet, version) -> build((PacketPlayOutPlayerListHeaderFooter)packet, version));
+		buildMap.put(PacketPlayOutScoreboardDisplayObjective.class, (packet, version) -> build((PacketPlayOutScoreboardDisplayObjective)packet, version));
+		buildMap.put(PacketPlayOutScoreboardObjective.class, (packet, version) -> build((PacketPlayOutScoreboardObjective)packet, version));
+		buildMap.put(PacketPlayOutScoreboardScore.class, (packet, version) -> build((PacketPlayOutScoreboardScore)packet, version));
+		buildMap.put(PacketPlayOutScoreboardTeam.class, (packet, version) -> build((PacketPlayOutScoreboardTeam)packet, version));
+	}
+
+	/**
+	 * Converts custom packet into platform-specific packet by calling a function from
+	 * {@link #buildMap}.
+	 * 
+	 * @param	packet
+	 * 			Packet to build
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException
+	 * 			if reflection fails
+	 */
+	public Object build(TabPacket packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		return buildMap.get(packet.getClass()).apply(packet, clientVersion);
+	}
+
+	/**
+	 * Constructs platform-specific PacketPlayOutBoss class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Constructs platform-specific PacketPlayOutChat class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutChat packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Constructs platform-specific PacketPlayOutPlayerInfo class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutPlayerInfo packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Constructs platform-specific PacketPlayOutPlayerListHeaderFooter class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutPlayerListHeaderFooter packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Constructs platform-specific PacketPlayOutScoreboardDisplayObjective class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutScoreboardDisplayObjective packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Constructs platform-specific PacketPlayOutScoreboardObjective class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutScoreboardObjective packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Constructs platform-specific PacketPlayOutScoreboardScore class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutScoreboardScore packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Constructs platform-specific PacketPlayOutScoreboardTeam class based on custom packet class
+	 * 
+	 * @param	packet
+	 * 			Custom packet to be built
+	 * @param	clientVersion
+	 * 			Protocol version of player to build the packet for
+	 * @return	Platform-specific packet
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract Object build(PacketPlayOutScoreboardTeam packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Cuts given string to specified character length (or length-1 if last character is a color character)
+	 * and translates RGB to legacy colors. If string is not that long, the original string is returned.
+	 * RGB codes are converted into legacy, since cutting is only needed for <1.13.
+	 * If {@code string} is {@code null}, empty string is returned.
+	 * @param	string
+	 * 			String to cut
+	 * @param	length
+	 * 			Length to cut to
+	 * @return	string cut to {@code length} characters
+	 */
+	public String cutTo(String string, int length) {
+		if (string == null) return "";
+		String legacyText = string;
+		if (string.contains("#")) {
+			//converting RGB to legacy colors
+			legacyText = RGBUtils.getInstance().convertRGBtoLegacy(string);
+		}
+		if (legacyText.length() <= length) return legacyText;
+		if (legacyText.charAt(length-1) == EnumChatFormat.COLOR_CHAR) {
+			return legacyText.substring(0, length-1); //cutting one extra character to prevent prefix ending with "&"
+		} else {
+			return legacyText.substring(0, length);
+		}
+	}
+
+	/**
+	 * If {@code clientVersion} is >= 1.13, creates a component from given text and returns
+	 * it as a serialized component, which BungeeCord uses.
+	 * <p>
+	 * If {@code clientVersion} is < 1.12, the text is cut to {@code length} characters if
+	 * needed and returned.
+	 * 
+	 * @param	text
+	 * 			Text to convert
+	 * @param	clientVersion
+	 * 			Version of player to convert text for
+	 * @return	serialized component for 1.13+ clients, cut string for 1.12-
+	 */
+	public String jsonOrCut(String text, ProtocolVersion clientVersion, int length) {
+		if (text == null) return null;
+		if (clientVersion.getMinorVersion() >= 13) {
+			return IChatBaseComponent.optimizedComponent(text).toString(clientVersion);
+		} else {
+			return cutTo(text, length);
+		}
+	}
+
+	/**
+	 * Converts platform-specific instance of player info packet into 
+	 * {@link PacketPlayOutPlayerInfo} object.
+	 * 
+	 * @param	packet
+	 * 			platform-specific info packet
+	 * @param	clientVersion
+	 * 			Version of client receiving the packet
+	 * @return	The packet converted into {@link PacketPlayOutPlayerInfo}
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract PacketPlayOutPlayerInfo readPlayerInfo(Object packet, ProtocolVersion clientVersion) throws ReflectiveOperationException;
+
+	/**
+	 * Converts platform-specific instance of objective packet into 
+	 * {@link PacketPlayOutScoreboardObjective} object.
+	 * 
+	 * @param	packet
+	 * 			platform-specific objective packet
+	 * @return	The packet converted into {@link PacketPlayOutScoreboardObjective}
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract PacketPlayOutScoreboardObjective readObjective(Object packet) throws ReflectiveOperationException;
+
+	/**
+	 * Converts platform-specific instance of display objective packet into 
+	 * {@link PacketPlayOutScoreboardDisplayObjective} object.
+	 * 
+	 * @param	packet
+	 * 			platform-specific display objective packet
+	 * @return	The packet converted into {@link PacketPlayOutScoreboardDisplayObjective}
+	 * @throws	ReflectiveOperationException 
+	 * 			if thrown by reflective operation
+	 */
+	public abstract PacketPlayOutScoreboardDisplayObjective readDisplayObjective(Object packet) throws ReflectiveOperationException;
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutBoss.java

@@ -0,0 +1,280 @@
+package me.neznamy.tab.api.protocol;
+
+import java.util.UUID;
+
+import me.neznamy.tab.api.bossbar.BarColor;
+import me.neznamy.tab.api.bossbar.BarStyle;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutBoss implements TabPacket {
+
+	/** UUID of the BossBar */
+	private final UUID id;
+
+	/** Action of this packet */
+	private final Action operation;
+
+	/** BossBar title */
+	private String name;
+
+	/** BossBar progress (0-1)*/
+	private float pct;
+
+	/** BossBar color */
+	private BarColor color;
+
+	/** BossBar style */
+	private BarStyle overlay;
+
+	/** Darken screen flag */
+	private boolean darkenScreen;
+
+	/** Play music flag */
+	private boolean playMusic;
+
+	/** Create fog flag */
+	private boolean createWorldFog;
+
+	/**
+	 * Constructs new instance with given parameters and  
+	 * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action}.ADD action
+	 * 
+	 * @param	id
+	 * 			BossBar uuid
+	 * @param	name
+	 * 			BossBar title
+	 * @param	pct
+	 * 			BossBar progress
+	 * @param	color
+	 * 			BossBar color
+	 * @param	overlay
+	 * 			BossBar style
+	 */
+	public PacketPlayOutBoss(UUID id, String name, float pct, BarColor color, BarStyle overlay) {
+		this.operation = Action.ADD;
+		this.id = id;
+		this.name = name;
+		this.pct = pct;
+		this.color = color;
+		this.overlay = overlay;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and  
+	 * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action}.REMOVE action
+	 * 
+	 * @param	id
+	 * 			BossBar uuid
+	 */
+	public PacketPlayOutBoss(UUID id) {
+		this.operation = Action.REMOVE;
+		this.id = id;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and  
+	 * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action}.UPDATE_PCT action
+	 * 
+	 * @param	id
+	 * 			BossBar uuid
+	 * @param	pct
+	 * 			BossBar progress
+	 */
+	public PacketPlayOutBoss(UUID id, float pct) {
+		this.operation = Action.UPDATE_PCT;
+		this.id = id;
+		this.pct = pct;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and  
+	 * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action}.UPDATE_NAME action
+	 * 
+	 * @param	id
+	 * 			BossBar uuid
+	 * @param	name
+	 * 			BossBar title
+	 */
+	public PacketPlayOutBoss(UUID id, String name) {
+		this.operation = Action.UPDATE_NAME;
+		this.id = id;
+		this.name = name;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and  
+	 * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action}.UPDATE_STYLE action
+	 * 
+	 * @param	id
+	 * 			BossBar uuid
+	 * @param	color
+	 * 			BossBar color
+	 * @param	overlay
+	 * 			BossBar style
+	 */
+	public PacketPlayOutBoss(UUID id, BarColor color, BarStyle overlay) {
+		this.operation = Action.UPDATE_STYLE;
+		this.id = id;
+		this.color = color;
+		this.overlay = overlay;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and  
+	 * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action}.UPDATE_PROPERTIES action
+	 * 
+	 * @param	darkenScreen
+	 * 			Darken screen flag
+	 * @param	playMusic
+	 * 			Play music flag
+	 * @param	createWorldFog
+	 * 			Create fog flag
+	 */
+	public PacketPlayOutBoss(UUID id, boolean darkenScreen, boolean playMusic, boolean createWorldFog) {
+		this.operation = Action.UPDATE_PROPERTIES;
+		this.id = id;
+		this.darkenScreen = darkenScreen;
+		this.playMusic = playMusic;
+		this.createWorldFog = createWorldFog;
+	}
+
+	/**
+	 * Returns bitmask based on {@link #darkenScreen}, {@link #playMusic} and {@link #darkenScreen} values.
+	 * <p>
+	 * {@link #darkenScreen} adds {@code 1}, {@link #playMusic} {@code 2} and {@link #darkenScreen} {@code 4}
+	 * to the final value.
+	 * 
+	 * @return the bitmask
+	 */
+	public byte getFlags(){
+		byte value = 0;
+		if (darkenScreen) value += 1;
+		if (playMusic) value += 2;
+		if (createWorldFog) value += 4;
+		return value;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutBoss{id=%s,operation=%s,name=%s,pct=%s,color=%s,overlay=%s,darkenScreen=%s,playMusic=%s,createWorldFog=%s}", 
+				id, operation, name, pct, color, overlay, darkenScreen, playMusic, createWorldFog);
+	}
+
+	/**
+	 * Returns {@link #color}
+	 * @return	color
+	 */
+	public BarColor getColor() {
+		return color;
+	}
+
+	/**
+	 * Returns {@link #overlay}
+	 * @return	style
+	 */
+	public BarStyle getOverlay() {
+		return overlay;
+	}
+
+	/**
+	 * Returns {@link #name}
+	 * @return	name
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * Returns {@link #id}
+	 * @return	id
+	 */
+	public UUID getId() {
+		return id;
+	}
+
+	/**
+	 * Returns {@link #pct}
+	 * @return	progress
+	 */
+	public float getPct() {
+		return pct;
+	}
+
+	/**
+	 * Returns {@link #operation}
+	 * @return	packet action
+	 */
+	public Action getOperation() {
+		return operation;
+	}
+
+	/**
+	 * Returns {@link #darkenScreen}
+	 * @return	darkenScreen
+	 */
+	public boolean isDarkenScreen() {
+		return darkenScreen;
+	}
+
+	/**
+	 * Returns {@link #createWorldFog}
+	 * @return	createWorldFog
+	 */
+	public boolean isCreateWorldFog() {
+		return createWorldFog;
+	}
+
+	/**
+	 * Returns {@link #playMusic}
+	 * @return	playMusic
+	 */
+	public boolean isPlayMusic() {
+		return playMusic;
+	}
+
+	/**
+	 * Sets {@link #darkenScreen} to specified value
+	 * 
+	 * @param	darkenScreen
+	 * 			Darken screen flag
+	 */
+	public void setDarkenScreen(boolean darkenScreen) {
+		this.darkenScreen = darkenScreen;
+	}
+
+	/**
+	 * Sets {@link #createWorldFog} to specified value
+	 * 
+	 * @param	createWorldFog
+	 * 			Create fog flag
+	 */
+	public void setCreateWorldFog(boolean createWorldFog) {
+		this.createWorldFog = createWorldFog;
+	}
+
+	/**
+	 * Sets {@link #playMusic} to specified value
+	 * 
+	 * @param	playMusic
+	 * 			Play music flag
+	 */
+	public void setPlayMusic(boolean playMusic) {
+		this.playMusic = playMusic;
+	}
+
+	/**
+	 * An enum representing all valid boss packet actions.
+	 * Calling ordinal() will return action's network ID.
+	 */
+	public enum Action {
+
+		ADD,
+		REMOVE,
+		UPDATE_PCT,
+		UPDATE_NAME,
+		UPDATE_STYLE,
+		UPDATE_PROPERTIES
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutChat.java

@@ -0,0 +1,60 @@
+package me.neznamy.tab.api.protocol;
+
+import me.neznamy.tab.api.chat.IChatBaseComponent;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutChat implements TabPacket {
+
+	/** Message to be sent */
+	private final IChatBaseComponent message;
+
+	/** Message position */
+	private final ChatMessageType type;
+
+	/**
+	 * Constructs new instance with given parameters
+	 * 
+	 * @param	message
+	 * 			Chat message to be sent
+	 * @param	type
+	 * 			Message position
+	 */
+	public PacketPlayOutChat(IChatBaseComponent message, ChatMessageType type) {
+		this.message = message;
+		this.type = type;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutChat{message=%s,type=%s}", message, type);
+	}
+
+	/**
+	 * Returns {@link #message}
+	 * @return	message
+	 */
+	public IChatBaseComponent getMessage() {
+		return message;
+	}
+
+	/**
+	 * Returns {@link #type}
+	 * @return	type
+	 */
+	public ChatMessageType getType() {
+		return type;
+	}
+
+	/**
+	 * An enum representing positions of a chat message
+	 * Calling ordinal() will return type's network ID.
+	 */
+	public enum ChatMessageType {
+
+		CHAT,
+		SYSTEM,
+		GAME_INFO
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutPlayerInfo.java

@@ -0,0 +1,305 @@
+package me.neznamy.tab.api.protocol;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.UUID;
+
+import me.neznamy.tab.api.chat.IChatBaseComponent;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutPlayerInfo implements TabPacket {
+
+	/** Packet action */
+	private final EnumPlayerInfoAction action;
+
+	/** List of affected entries */
+	private final List<PlayerInfoData> entries;
+
+	/**
+	 * Constructs new instance with given parameters.
+	 * 
+	 * @param	action
+	 * 			Packet action
+	 * @param	entries
+	 * 			Affected entries
+	 */
+	public PacketPlayOutPlayerInfo(EnumPlayerInfoAction action, PlayerInfoData... entries) {
+		this.action = action;
+		this.entries = Arrays.asList(entries);
+	}
+
+	/**
+	 * Constructs new instance with given parameters.
+	 * 
+	 * @param	action
+	 * 			Packet action
+	 * @param	entries
+	 * 			Affected entries
+	 */
+	public PacketPlayOutPlayerInfo(EnumPlayerInfoAction action, List<PlayerInfoData> entries) {
+		this.action = action;
+		this.entries = entries;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutPlayerInfo{action=%s,entries=%s}", action, entries);
+	}
+
+	/**
+	 * Returns {@link #action}
+	 * @return	packet action
+	 */
+	public EnumPlayerInfoAction getAction() {
+		return action;
+	}
+
+	/**
+	 * Returns {@link #entries}
+	 * @return	affected entries
+	 */
+	public List<PlayerInfoData> getEntries() {
+		return entries;
+	}
+
+	/**
+	 * A subclass representing player list entry
+	 */
+	public static class PlayerInfoData {
+
+		/** Latency */
+		private int latency;
+
+		/** GameMode */
+		private EnumGamemode gameMode = EnumGamemode.SURVIVAL; //ProtocolLib causes NPE even when action does not use GameMode
+
+		/** 
+		 * Display name displayed in TabList. Using {@code null} results in no display name
+		 * and scoreboard team prefix/suffix being visible in TabList instead.
+		 */
+		private IChatBaseComponent displayName;
+
+		/** Real name of affected player */
+		private String name;
+
+		/** Player UUID */
+		private UUID uniqueId;
+
+		/** platform-specific skin object */
+		private Object skin;
+
+		/**
+		 * Constructs new instance with given parameters. Suitable for 
+		 * {@link EnumPlayerInfoAction}.ADD_PLAYER action
+		 * 
+		 * @param	name
+		 * 			Player's name
+		 * @param	uniqueId
+		 * 			Player's uuid
+		 * @param	skin
+		 * 			Player's platform-specific skin object
+		 * @param	latency
+		 * 			Player's ping
+		 * @param	gameMode
+		 * 			Player's GameMode
+		 * @param	displayName
+		 * 			Player's display name
+		 */
+		public PlayerInfoData(String name, UUID uniqueId, Object skin, int latency, EnumGamemode gameMode, IChatBaseComponent displayName) {
+			this.name = name;
+			this.uniqueId = uniqueId;
+			this.skin = skin;
+			this.latency = latency;
+			this.gameMode = gameMode;
+			this.displayName = displayName;
+		}
+
+		/**
+		 * Constructs new instance with given parameters. Suitable for 
+		 * {@link EnumPlayerInfoAction}.UPDATE_GAME_MODE action
+		 * 
+		 * @param	uniqueId
+		 * 			Player's uuid
+		 * @param	gameMode
+		 * 			Player's GameMode
+		 */
+		public PlayerInfoData(UUID uniqueId, EnumGamemode gameMode) {
+			this.uniqueId = uniqueId;
+			this.gameMode = gameMode;
+		}
+
+		/**
+		 * Constructs new instance with given parameters. Suitable for 
+		 * {@link EnumPlayerInfoAction}.UPDATE_LATENCY action
+		 * 
+		 * @param	uniqueId
+		 * 			Player's uuid
+		 * @param	latency
+		 * 			Player's ping
+		 */
+		public PlayerInfoData(UUID uniqueId, int latency) {
+			this.uniqueId = uniqueId;
+			this.latency = latency;
+		}
+
+		/**
+		 * Constructs new instance with given parameters. Suitable for 
+		 * {@link EnumPlayerInfoAction}.UPDATE_DISPLAY_NAME action
+		 * 
+		 * @param	uniqueId
+		 * 			Player's uuid
+		 * @param	displayName
+		 * 			Player's display name
+		 */
+		public PlayerInfoData(UUID uniqueId, IChatBaseComponent displayName) {
+			this.uniqueId = uniqueId;
+			this.displayName = displayName;
+		}
+
+		/**
+		 * Constructs new instance with given parameter. Suitable for 
+		 * {@link EnumPlayerInfoAction}.REMOVE_PLAYER action
+		 * 
+		 * @param	uniqueId
+		 * 			Player's uuid
+		 */
+		public PlayerInfoData(UUID uniqueId) {
+			this.uniqueId = uniqueId;
+		}
+
+		@Override
+		public String toString() {
+			return String.format("PlayerInfoData{latency=%s,gameMode=%s,displayName=%s,name=%s,uniqueId=%s,skin=%s}",
+					latency, gameMode, displayName, name, uniqueId, skin);
+		}
+
+		/**
+		 * Returns {@link #latency}
+		 * @return	latency
+		 */
+		public int getLatency() {
+			return latency;
+		}
+
+		/**
+		 * Sets {@link #latency} to specified value
+		 * @param	latency
+		 * 			Latency to use
+		 */
+		public void setLatency(int latency) {
+			this.latency = latency;
+		}
+
+		/**
+		 * Returns {@link #displayName}
+		 * @return	displayName
+		 */
+		public IChatBaseComponent getDisplayName() {
+			return displayName;
+		}
+
+		/**
+		 * Sets {@link #displayName} to specified value
+		 * @param	displayName
+		 * 			Display name to use
+		 */
+		public void setDisplayName(IChatBaseComponent displayName) {
+			this.displayName = displayName;
+		}
+
+		/**
+		 * Returns {@link #uniqueId}
+		 * @return	uniqueId
+		 */
+		public UUID getUniqueId() {
+			return uniqueId;
+		}
+
+		/**
+		 * Sets {@link #uniqueId} to specified value
+		 * @param	uniqueId
+		 * 			UUID to use
+		 */
+		public void setUniqueId(UUID uniqueId) {
+			this.uniqueId = uniqueId;
+		}
+
+		/**
+		 * Returns {@link #name}
+		 * @return	name
+		 */
+		public String getName() {
+			return name;
+		}
+
+		/**
+		 * Sets {@link #name} to specified value
+		 * @param	name
+		 * 			name to use
+		 */
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		/**
+		 * Returns {@link #gameMode}
+		 * @return	gameMode
+		 */
+		public EnumGamemode getGameMode() {
+			return gameMode;
+		}
+
+		/**
+		 * Sets {@link #gameMode} to specified value
+		 * @param	gameMode
+		 * 			GameMode to use
+		 */
+		public void setGameMode(EnumGamemode gameMode) {
+			this.gameMode = gameMode;
+		}
+
+		/**
+		 * Returns {@link #skin}
+		 * @return	skin
+		 */
+		public Object getSkin() {
+			return skin;
+		}
+
+		/**
+		 * Sets {@link #skin} to specified value
+		 * @param	skin
+		 * 			Skin to use
+		 */
+		public void setSkin(Object skin) {
+			this.skin = skin;
+		}
+	}
+
+	/**
+	 * En enum representing packet action
+	 * Calling ordinal() will return action's network ID.
+	 */
+	public enum EnumPlayerInfoAction {
+
+		ADD_PLAYER,
+		UPDATE_GAME_MODE,
+		UPDATE_LATENCY,
+		UPDATE_DISPLAY_NAME,
+		REMOVE_PLAYER
+	}
+
+	/**
+	 * An enum representing GameMode
+	 */
+	public enum EnumGamemode {
+
+		NOT_SET,
+		SURVIVAL,
+		CREATIVE,
+		ADVENTURE,
+		SPECTATOR
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutPlayerListHeaderFooter.java

@@ -0,0 +1,63 @@
+package me.neznamy.tab.api.protocol;
+
+import me.neznamy.tab.api.chat.IChatBaseComponent;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutPlayerListHeaderFooter implements TabPacket {
+
+	/** TabList header */
+	private final IChatBaseComponent header;
+
+	/** TabList footer */
+	private final IChatBaseComponent footer;
+
+	/**
+	 * Constructs new instance with given parameters. They are converted to {@link IChatBaseComponent}
+	 * using {@link IChatBaseComponent#optimizedComponent(String)} method.
+	 * 
+	 * @param	header
+	 * 			TabList header
+	 * @param	footer
+	 * 			TabList footer
+	 */
+	public PacketPlayOutPlayerListHeaderFooter(String header, String footer) {
+		this.header = IChatBaseComponent.optimizedComponent(header);
+		this.footer = IChatBaseComponent.optimizedComponent(footer);
+	}
+
+	/**
+	 * Constructs new instance with given parameters.
+	 * 
+	 * @param	header
+	 * 			TabList header
+	 * @param	footer
+	 * 			TabList footer
+	 */
+	public PacketPlayOutPlayerListHeaderFooter(IChatBaseComponent header, IChatBaseComponent footer) {
+		this.header = header;
+		this.footer = footer;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutPlayerListHeaderFooter{header=%s,footer=%s}", header, footer);
+	}
+
+	/**
+	 * Returns {@link #header}
+	 * @return	header
+	 */
+	public IChatBaseComponent getHeader() {
+		return header;
+	}
+
+	/**
+	 * Returns {@link #footer}
+	 * @return	footer
+	 */
+	public IChatBaseComponent getFooter() {
+		return footer;
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardDisplayObjective.java

@@ -0,0 +1,55 @@
+package me.neznamy.tab.api.protocol;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutScoreboardDisplayObjective implements TabPacket {
+
+	/**
+	 * Display slot.
+	 * 0 = PlayerList,
+	 * 1 = SideBar,
+	 * 2 = BelowName.
+	 */
+	private final int slot;
+	
+	/** Up to 16 characters long objective name */
+	private final String objectiveName;
+
+	/**
+	 * Constructs new instance with given parameters
+	 * @param	slot
+	 * 			Display slot
+	 * @param	objectiveName
+	 * 			Internal name of the objective
+	 * @throws	IllegalArgumentException
+	 * 			if {@code objectiveName} is null or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardDisplayObjective(int slot, String objectiveName) {
+		if (objectiveName == null) throw new IllegalArgumentException("objectiveName cannot be null");
+		if (objectiveName.length() > 16) throw new IllegalArgumentException("objectiveName cannot be longer than 16 character (is " + objectiveName.length() + ")");
+		this.slot = slot;
+		this.objectiveName = objectiveName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutScoreboardDisplayObjective{slot=%s,objectiveName=%s}", slot, objectiveName);
+	}
+
+	/**
+	 * Returns {@link #slot}
+	 * @return	slot
+	 */
+	public int getSlot() {
+		return slot;
+	}
+
+	/**
+	 * Returns {@link #objectiveName}
+	 * @return	objectiveName
+	 */
+	public String getObjectiveName() {
+		return objectiveName;
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardObjective.java

@@ -0,0 +1,109 @@
+package me.neznamy.tab.api.protocol;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutScoreboardObjective implements TabPacket {
+
+	/** Up to 16 characters long objective name */
+	private final String objectiveName;
+
+	/** Display name */
+	private final String displayName;
+
+	/** Display type, only takes effect in PlayerList */
+	private final EnumScoreboardHealthDisplay renderType;
+
+	/**
+	 * Packet action.
+	 * 0 = register,
+	 * 1 = unregister,
+	 * 2 = update title
+	 */
+	private final int method;
+
+	/**
+	 * Constructs new instance with given parameters.
+	 * 
+	 * @param	method
+	 * 			Packet action (0 = add, 1 = remove, 2 = update title)
+	 * @param	objectiveName
+	 * 			objective name, up to 16 characters long
+	 * @param displayName - title
+	 * @param renderType - display type
+	 * @throws	IllegalArgumentException
+	 * 			if {@code objectiveName} is null or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardObjective(int method, String objectiveName, String displayName, EnumScoreboardHealthDisplay renderType) {
+		if (objectiveName == null) throw new IllegalArgumentException("objectiveName cannot be null");
+		if (objectiveName.length() > 16) throw new IllegalArgumentException("objectiveName cannot be longer than 16 character (is " + objectiveName.length() + ")");
+		this.objectiveName = objectiveName;
+		this.displayName = displayName;
+		this.renderType = renderType;
+		this.method = method;
+	}
+
+	/**
+	 * Constructs new packet with given objective name and 1 (unregister) action.
+	 * 
+	 * @param	objectiveName
+	 * 			objective name, up to 16 characters long
+	 * @throws	IllegalArgumentException
+	 * 			if {@code objectiveName} is null or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardObjective(String objectiveName) {
+		if (objectiveName == null) throw new IllegalArgumentException("objectiveName cannot be null");
+		if (objectiveName.length() > 16) throw new IllegalArgumentException("objectiveName cannot be longer than 16 character (is " + objectiveName.length() + ")");
+		this.objectiveName = objectiveName;
+		this.displayName = ""; //avoiding NPE on <1.7
+		this.method = 1;
+		this.renderType = null;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutScoreboardObjective{objectiveName=%s,displayName=%s,renderType=%s,method=%s}",
+				objectiveName, displayName, renderType, method);
+	}
+
+	/**
+	 * Returns {@link #displayName}
+	 * @return	displayName
+	 */
+	public String getDisplayName() {
+		return displayName;
+	}
+
+	/**
+	 * Returns {@link #objectiveName}
+	 * @return	objectiveName
+	 */
+	public String getObjectiveName() {
+		return objectiveName;
+	}
+
+	/**
+	 * Returns {@link #renderType}
+	 * @return	renderType
+	 */
+	public EnumScoreboardHealthDisplay getRenderType() {
+		return renderType;
+	}
+
+	/**
+	 * Returns {@link #method}
+	 * @return	packet action
+	 */
+	public int getMethod() {
+		return method;
+	}
+
+	/**
+	 * An enum representing available display types.
+	 * They only take effect in PlayerList position.
+	 */
+	public enum EnumScoreboardHealthDisplay {
+
+		INTEGER, HEARTS
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardScore.java

@@ -0,0 +1,89 @@
+package me.neznamy.tab.api.protocol;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutScoreboardScore implements TabPacket {
+
+	/** Packet action */
+	private final Action action;
+
+	/** Objective name */
+	private final String objectiveName;
+
+	/** Affected player */
+	private final String player;
+
+	/** Player's score */
+	private final int score;
+
+	/**
+	 * Constructs new instance with given parameters
+	 * 
+	 * @param	action
+	 * 			Packet action
+	 * @param	objectiveName
+	 * 			Objective name
+	 * @param	player
+	 * 			Affected player
+	 * @param	score
+	 * 			Player's score
+	 * @throws	IllegalArgumentException
+	 * 			if {@code objectiveName} is null or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardScore(Action action, String objectiveName, String player, int score) {
+		if (objectiveName == null) throw new IllegalArgumentException("objectiveName cannot be null");
+		if (objectiveName.length() > 16) throw new IllegalArgumentException("objectiveName cannot be longer than 16 character (is " + objectiveName.length() + ")");
+		this.action = action;
+		this.objectiveName = objectiveName;
+		this.player = player;
+		this.score = score;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutScoreboardScore{action=%s,objectiveName=%s,player=%s,score=%s}", 
+				action, objectiveName, player, score);
+	}
+
+	/**
+	 * Returns {@link #action}
+	 * @return	packet action
+	 */
+	public Action getAction() {
+		return action;
+	}
+
+	/**
+	 * Returns {@link #objectiveName}
+	 * @return	objective name
+	 */
+	public String getObjectiveName() {
+		return objectiveName;
+	}
+
+	/**
+	 * Returns {@link #player}
+	 * @return	player
+	 */
+	public String getPlayer() {
+		return player;
+	}
+
+	/**
+	 * Returns {@link #score}
+	 * @return	score
+	 */
+	public int getScore() {
+		return score;
+	}
+
+	/**
+	 * An enum representing action types
+	 */
+	public enum Action {
+
+		CHANGE,
+		REMOVE
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardTeam.java

@@ -0,0 +1,264 @@
+package me.neznamy.tab.api.protocol;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import me.neznamy.tab.api.chat.EnumChatFormat;
+
+/**
+ * A class representing platform specific packet class
+ */
+public class PacketPlayOutScoreboardTeam implements TabPacket {
+
+	/**
+	 * Up to 16 characters long team name.
+	 * It is used to sort players alphabetically in TabList by team names.
+	 * Team-less players appear on top, sorted by usernames.
+	 * Players with teams are below them, players of the same team are
+	 * sorted alphabetically by usernames.
+	 */
+	private final String name;
+
+	/** Team prefix, limited to 16 characters, on <1.13 */
+	private String playerPrefix;
+
+	/** Team suffix, limited to 16 characters, on <1.13 */
+	private String playerSuffix;
+
+	/** 
+	 * NameTag visibility rule since 1.8. Possible options are:
+	 * {@code always}, {@code hideForOtherTeams}, {@code hideForOwnTeam}, {@code never}
+	 */
+	private String nameTagVisibility;
+
+	/**
+	 * Collision rule added in 1.9. Possible options are:
+	 * {@code always}, {@code pushOtherTeams}, {@code pushOwnTeam}, {@code never}
+	 */
+	private String collisionRule;
+
+	/**
+	 * Team color field added in 1.13. It determines name color,
+	 * prefix and suffix color start.
+	 */
+	private EnumChatFormat color;
+
+	/** 
+	 * Affected entities. For players, it is their name, for other entities their UUID
+	 * Player name length is limited to 16 characters for <1.8, 40 characters since 1.8.
+	 * Entity UUID option was added in 1.8.
+	 */
+	private Collection<String> players = Collections.emptyList();
+
+	/**
+	 * Packet action.
+	 * 0 = create team,
+	 * 1 = remove team,
+	 * 2 = update team info,
+	 * 3 = add entries,
+	 * 4 = remove entries
+	 */
+	private final int method;
+
+	/**
+	 * Bit mask.
+	 * 0x01: Allow friendly fire,
+	 * 0x02: Can see invisible players on the same team.
+	 */
+	private int options;
+
+	/**
+	 * Constructs new instance with given parameters. Private constructor used
+	 * internally to validate team name and set action.
+	 * 
+	 * @param	method
+	 * 			Packet action (0 = create team, 1 = remove team, 2 = update team info,
+	 * 			3 = add entries, 4 = remove entries)
+	 * @param	name
+	 * 			Team name, up to 16 characters long
+	 * @throws	IllegalArgumentException
+	 * 			if {@code name} is null, empty or longer than 16 characters
+	 */
+	private PacketPlayOutScoreboardTeam(int method, String name) {
+		if (name == null || name.length() == 0) throw new IllegalArgumentException("Team name cannot be null/empty");
+		if (name.length() > 16) throw new IllegalArgumentException("name cannot be longer than 16 character (is " + name.length() + ")");
+		this.method = method;
+		this.name = name;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and 0 (CREATE) action
+	 * 
+	 * @param	team
+	 * 			Team name, up to 16 characters long
+	 * @param	prefix
+	 * 			Prefix of players in team
+	 * @param	suffix
+	 * 			Suffix of players in team
+	 * @param	visibility
+	 * 			NameTag visibility rule
+	 * @param	collision
+	 * 			Collision rule
+	 * @param	players
+	 * 			Affected entities
+	 * @param	options
+	 * 			bitmask of team options
+	 * @throws	IllegalArgumentException
+	 * 			if {@code name} is null, empty or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardTeam(String team, String prefix, String suffix, String visibility, String collision, Collection<String> players, int options) {
+		this(0, team);
+		this.playerPrefix = prefix;
+		this.playerSuffix = suffix;
+		this.nameTagVisibility = visibility;
+		this.collisionRule = collision;
+		this.players = players;
+		this.options = options;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and 1 (REMOVE) action
+	 * 
+	 * @param	team
+	 * 			Team name, up to 16 characters long
+	 * @throws	IllegalArgumentException
+	 * 			if {@code name} is null, empty or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardTeam(String team) {
+		this(1, team);
+	}
+
+	/**
+	 * Constructs new instance with given parameters and 2 (UPDATE_TEAM_INFO) action
+	 * 
+	 * @param	team
+	 * 			Team name, up to 16 characters long
+	 * @param	prefix
+	 * 			Prefix of players in team
+	 * @param	suffix
+	 * 			Suffix of players in team
+	 * @param	visibility
+	 * 			NameTag visibility rule
+	 * @param	collision
+	 * 			Collision rule
+	 * @param	options
+	 * 			bitmask of team options
+	 * @throws	IllegalArgumentException
+	 * 			if {@code name} is null, empty or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardTeam(String team, String prefix, String suffix, String visibility, String collision, int options) {
+		this(2, team);
+		this.playerPrefix = prefix;
+		this.playerSuffix = suffix;
+		this.nameTagVisibility = visibility;
+		this.collisionRule = collision;
+		this.options = options;
+	}
+
+	/**
+	 * Constructs new instance with given parameters and 3 (ADD_PLAYERS) if {@code add} is {@code true}, 
+	 * 4 (REMOVE_PLAYERS) if {@code add} is {@code false} action.
+	 * 
+	 * @param	team
+	 * 			Team name, up to 16 characters long
+	 * @param	players
+	 * 			Affected entities
+	 * @param	add
+	 * 			{@code true} if players should be added, {@code false} if removed from team
+	 * @throws	IllegalArgumentException
+	 * 			if {@code name} is null, empty or longer than 16 characters
+	 */
+	public PacketPlayOutScoreboardTeam(String team, Collection<String> players, boolean add) {
+		this(add ? 3 : 4, team);
+		this.players = players;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutScoreboardTeam{name=%s,playerPrefix=%s,playerSuffix=%s,nameTagVisibility=%s,"
+				+ "collisionRule=%s,color=%s,players=%s,method=%s,options=%s}",
+				name, playerPrefix, playerSuffix, nameTagVisibility, collisionRule, color, players, method, options);
+	}
+
+	/**
+	 * Returns {@link #name}
+	 * @return	team name
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * Returns {@link #playerPrefix}
+	 * @return	playerPrefix
+	 */
+	public String getPlayerPrefix() {
+		return playerPrefix;
+	}
+
+	/**
+	 * Returns {@link #playerSuffix}
+	 * @return	playerSuffix
+	 */
+	public String getPlayerSuffix() {
+		return playerSuffix;
+	}
+
+	/**
+	 * Returns {@link #nameTagVisibility}
+	 * @return	nameTagVisibility
+	 */
+	public String getNameTagVisibility() {
+		return nameTagVisibility;
+	}
+	
+	/**
+	 * Returns {@link #collisionRule}
+	 * @return	collisionRule
+	 */
+	public String getCollisionRule() {
+		return collisionRule;
+	}
+
+	/**
+	 * Sets {@link #color} to specified color
+	 * 
+	 * @param	color
+	 * 			color to use
+	 */
+	public void setColor(EnumChatFormat color) {
+		this.color = color;
+	}
+
+	/**
+	 * Returns {@link #color}
+	 * @return	color
+	 */
+	public EnumChatFormat getColor() {
+		return color;
+	}
+
+	/**
+	 * Returns {@link #players}
+	 * @return	players
+	 */
+	public Collection<String> getPlayers() {
+		return players;
+	}
+
+	/**
+	 * Returns {@link #options}
+	 * @return	team options
+	 */
+	public int getOptions() {
+		return options;
+	}
+	
+	/**
+	 * Returns {@link #method}
+	 * @return	packet action
+	 */
+	public int getMethod() {
+		return method;
+	}
+}

api/src/main/java/me/neznamy/tab/api/protocol/TabPacket.java

@@ -0,0 +1,16 @@
+package me.neznamy.tab.api.protocol;
+
+/**
+ * Interface representing a packet that can be sent to client independently of platform.
+ * It is technically empty, existence is only present to restrict type access
+ * when sending packets to player, so {@link me.neznamy.tab.api.TabPlayer#sendCustomPacket(TabPacket)} cannot
+ * be called with an actual packet.
+ */
+public interface TabPacket {
+
+	/**
+	 * Returns user-friendly string representation of the packet
+	 * @return user-friendly string representation of the packet
+	 */
+	String toString();
+}

api/src/main/java/me/neznamy/tab/api/scoreboard/Line.java

@@ -0,0 +1,29 @@
+package me.neznamy.tab.api.scoreboard;
+
+/**
+ * An interface allowing to work with a line of
+ * text in scoreboard.
+ *
+ */
+public interface Line {
+
+	/**
+	 * Returns configured raw text of this line. Placeholders
+	 * remain in raw format.
+	 * 
+	 * @return	raw text of this line
+	 */
+	String getText();
+	
+	/**
+	 * Changes text to new value. Supports placeholders, which are
+	 * automatically registered if needed and refreshed periodically
+	 * based on configuration. No need to call this method to try to
+	 * keep placeholders up to date. If value is identical to previous 
+	 * one, nothing happens.
+	 * 
+	 * @param	text
+	 * 			Raw text to display in the line
+	 */
+	void setText(String text);
+}

api/src/main/java/me/neznamy/tab/api/scoreboard/Scoreboard.java

@@ -0,0 +1,87 @@
+package me.neznamy.tab.api.scoreboard;
+
+import java.util.List;
+
+/**
+ * An interface allowing to work with scoreboard, such as adding players,
+ * removing players and changing lines. New instance can be created using
+ * {@link ScoreboardManager#createScoreboard(String, String, List)},
+ * for scoreboards from config {@link ScoreboardManager#getRegisteredScoreboards()}.
+ */
+public interface Scoreboard {
+
+	/**
+	 * Returns internal name of this scoreboard. Name is defined in registration,
+	 * scoreboards from config use name they were defined with. This value is
+	 * used internally and in /tab announce scoreboard command.
+	 * 
+	 * @return	custom name of this scoreboard
+	 */
+	String getName();
+
+	/**
+	 * Returns raw title of this scoreboard. Placeholders stay in their
+	 * raw format.
+	 * 
+	 * @return	scoreboard title
+	 * @see		#setTitle(String)
+	 */
+	String getTitle();
+
+	/**
+	 * Sets title to specified value. Placeholders are refreshed automatically
+	 * with refresh intervals defined in config. No need to call this method
+	 * to try to keep placeholders up to date. Supports RGB codes using any of 
+	 * the supported formats.
+	 * <p>
+	 * Length is limited to 32 characters on <1.13. If the limit is exceeded,
+	 * text will be cut to 32 characters.
+	 * <p>
+	 * Calling this method with same title as before will not do anything.
+	 * 
+	 * @param	title
+	 * 			New title to use with placeholder support
+	 * @see		#getTitle()
+	 */
+	void setTitle(String title);
+
+	/**
+	 * Returns list of lines in this scoreboard in the order they appear
+	 * in game (first line is on top). This list should only be used for reading,
+	 * for adding/removing lines see {@link #addLine(String)} and {@link #removeLine(int)}.
+	 * 
+	 * @return	list of lines in this scoreboard
+	 * @see		#addLine(String)
+	 * @see		#removeLine(int)
+	 */
+	List<Line> getLines();
+
+	/**
+	 * Adds line with specified text on the bottom of scoreboard. Supports
+	 * placeholders, which will automatically be refreshed.
+	 * 
+	 * @param	text
+	 * 			Text to display
+	 * @see		#getLines()
+	 * @see		#removeLine(int)
+	 */
+	void addLine(String text);
+
+	/**
+	 * Removes line with specified index. Index starts at {@code 0} and ends at 
+	 * {@link #getLines()}.size()-1.
+	 * 
+	 * @param	index
+	 * 			Index of line to remove, starting at 0
+	 * @throws	IndexOutOfBoundsException
+	 * 			if the index is out of range (index < 0 || index >= {@link #getLines()}.size())
+	 * @see		#getLines()
+	 * @see		#addLine(String)
+	 */
+	void removeLine(int index);
+
+	/**
+	 * Unregisters this scoreboard from all players who can see it.
+	 */
+	void unregister();
+}

api/src/main/java/me/neznamy/tab/api/scoreboard/ScoreboardManager.java

@@ -0,0 +1,155 @@
+package me.neznamy.tab.api.scoreboard;
+
+import java.util.List;
+import java.util.Map;
+
+import me.neznamy.tab.api.TabPlayer;
+
+/**
+ * Interface allowing work with scoreboards, such as creating,
+ * sending, toggling and modifying.
+ * <p>
+ * Instance can be obtained using {@link me.neznamy.tab.api.TabAPI#getScoreboardManager()}.
+ * This requires the scoreboard feature to be enabled in config,
+ * the method will return null otherwise.
+ */
+public interface ScoreboardManager {
+
+	/**
+	 * Creates new scoreboard, registers and returns it. {@code name}
+	 * is internal name of the scoreboard, which it will be registered
+	 * with and further work where scoreboard name is used allowed.
+	 * <p>
+	 * Scoreboard {@code title} is limited to 32 characters on <1.13. If needed,
+	 * it will be cut to 32 character for those players (after replacing 
+	 * placeholders). RGB is supported using any of the supported formats.
+	 * Placeholders are supported.
+	 * <p>
+	 * {@code lines} will display in the same order as contained in the list.
+	 * Client can only see up to 15 lines at a time, however you can define
+	 * more, if some of them only consist of placeholder that might be empty.
+	 * 
+	 * @param	name
+	 * 			Internal name of the scoreboard
+	 * @param	title
+	 * 			The scoreboard title
+	 * @param	lines
+	 * 			Lines of text in scoreboard (supports placeholders)
+	 * @return	The new scoreboard with given parameters
+	 * @throws	NullPointerException
+	 * 			if {@code name} or {@code lines} is {@code null}
+	 */
+	Scoreboard createScoreboard(String name, String title, List<String> lines);
+	
+	/**
+	 * Returns map of registered scoreboards via config and API.
+	 * Map key is name of scoreboard, which is defined either in config
+	 * or using {@link #createScoreboard(String, String, List)}.
+	 * Map value is reference to the actual scoreboard.
+	 * 
+	 * @return	map of registered scoreboards
+	 */
+	Map<String, Scoreboard> getRegisteredScoreboards();
+	
+	/**
+	 * Displays scoreboard to defined player. This will disable all display
+	 * condition checks until the scoreboard is unregistered using 
+	 * {@link #resetScoreboard(TabPlayer)}. If the player already sees
+	 * this scoreboard, nothing will happen.
+	 * 
+	 * @param	player
+	 * 			Player to send scoreboard to
+	 * @param	scoreboard
+	 * 			Scoreboard to display
+	 * @throws	NullPointerException
+	 * 			if {@code player} or {@code scoreboard} is {@code null}
+	 * @see		#hasCustomScoreboard(TabPlayer)
+	 * @see		#resetScoreboard(TabPlayer)
+	 */
+	void showScoreboard(TabPlayer player, Scoreboard scoreboard);
+	
+	/**
+	 * Returns {@code true} if player has custom scoreboard set using
+	 * {@link #showScoreboard(TabPlayer, Scoreboard)}, {@code false} if not.
+	 * 
+	 * @param	player
+	 * 			Player to check
+	 * @return	{@code true} if player has custom scoreboard set using API, 
+	 * 			{@code false} if not
+	 * @see		#showScoreboard(TabPlayer, Scoreboard)
+	 * @see		#resetScoreboard(TabPlayer)
+	 */
+	boolean hasCustomScoreboard(TabPlayer player);
+	
+	/**
+	 * Hides custom scoreboard sent using {@link #showScoreboard(TabPlayer, Scoreboard)}
+	 * and re-enables internal display logic with conditions. If player does not
+	 * have any forced scoreboard, nothing happens.
+	 * 
+	 * @param	player
+	 * 			Player to hide custom scoreboard from
+	 * @see		#showScoreboard(TabPlayer, Scoreboard)
+	 * @see		#hasCustomScoreboard(TabPlayer)
+	 */
+	void resetScoreboard(TabPlayer player);
+	
+	/**
+	 * Returns {@code true} if player has scoreboard enabled, {@code false} 
+	 * if disabled (toggled) using either toggle command, 
+	 * {@link #toggleScoreboard(TabPlayer, boolean)} or
+	 * {@link #setScoreboardVisible(TabPlayer, boolean, boolean)}.
+	 * 
+	 * @param	player
+	 * 			Player to get visibility status of
+	 * @return	{@code true} if visible, {@code false} if disabled
+	 * @see		#setScoreboardVisible(TabPlayer, boolean, boolean)
+	 * @see		#toggleScoreboard(TabPlayer, boolean)
+	 */
+	boolean hasScoreboardVisible(TabPlayer player);
+	
+	/**
+	 * Sets scoreboard visibility of player to defined value. If visibility status
+	 * is same as player had before, nothing happens. If this call changes
+	 * visibility, scoreboard is toggled. If {@code sendToggleMessage} is {@code true},
+	 * toggle message defined in configuration is sent.
+	 * 
+	 * @param	player
+	 * 			Player to set visibility for
+	 * @param	visible
+	 * 			New visibility status
+	 * @param	sendToggleMessage
+	 * 			whether to send toggle message if status changed or not
+	 * @see		#toggleScoreboard(TabPlayer, boolean)
+	 * @see		#hasScoreboardVisible(TabPlayer)
+	 */
+	void setScoreboardVisible(TabPlayer player, boolean visible, boolean sendToggleMessage);
+	
+	/**
+	 * Toggles scoreboard for specified player. If player had scoreboard visible,
+	 * hides it. If hidden, shows it. If {@code sendToggleMessage} is {@code true},
+	 * toggle message defined in configuration is sent.
+	 * 
+	 * @param	player
+	 * 			Player to toggle scoreboard for
+	 * @param	sendToggleMessage
+	 * 			Whether to send toggle message or not
+	 * @see		#hasScoreboardVisible(TabPlayer)
+	 * @see		#setScoreboardVisible(TabPlayer, boolean, boolean)
+	 */
+	void toggleScoreboard(TabPlayer player, boolean sendToggleMessage);
+	
+	/**
+	 * Temporarily displays scoreboard to all players for specified amount of 
+	 * time (in milliseconds). Scoreboard name is either defined in config, or 
+	 * through API in {@link #createScoreboard(String, String, List)}.
+	 * 
+	 * @param	scoreboard
+	 * 			Scoreboard from config or registered via API
+	 * @param	duration
+	 * 			Duration in milliseconds
+	 * @throws	IllegalArgumentException
+	 * 			if no scoreboard was found with such name or {@code duration}
+	 * 			is < 0.
+	 */
+	void announceScoreboard(String scoreboard, int duration);
+}

api/src/main/java/me/neznamy/tab/api/task/RepeatingTask.java

@@ -0,0 +1,12 @@
+package me.neznamy.tab.api.task;
+
+public interface RepeatingTask {
+	
+	int getInterval();
+
+	void setInterval(int paramInt);
+
+	void cancel();
+
+	void setRunnable(Runnable paramRunnable);
+}

api/src/main/java/me/neznamy/tab/api/task/ThreadManager.java

@@ -0,0 +1,56 @@
+package me.neznamy.tab.api.task;
+
+import java.util.concurrent.Future;
+
+import me.neznamy.tab.api.TabFeature;
+
+public interface ThreadManager {
+
+	/**
+	 * Starts a task in new thread and measures how long it took to process
+	 * @param errorDescription - description to use if this task throws an error
+	 * @param feature - feature to add cpu usage to
+	 * @param type - usage type to add cpu usage to
+	 * @param task - the task
+	 */
+	Future<Void> runMeasuredTask(String errorDescription, TabFeature feature, String type, Runnable task);
+	
+	/**
+	 * Runs task in a new thread
+	 * @param errorDescription - description to use if this task throws an error
+	 * @param task - the task
+	 */
+	Future<Void> runTask(String errorDescription, Runnable task);
+	
+	/**
+	 * Starts a new task with defined repeat interval that measures cpu usage
+	 * @param intervalMilliseconds - task interval
+	 * @param errorDescription - description to use if this task throws an error
+	 * @param feature - feature to add cpu usage to
+	 * @param type - usage type to add cpu usage to
+	 * @param task - the task
+	 */
+	RepeatingTask startRepeatingMeasuredTask(int intervalMilliseconds, String errorDescription, TabFeature feature, String type, Runnable task);
+	
+	/**
+	 * Runs task with a delay and measures how long it took to process
+	 * @param delayMilliseconds - how long to run the task after
+	 * @param errorDescription - description to use if this task throws an error
+	 * @param feature - feature to add cpu usage to
+	 * @param type - usage type to add cpu usage to
+	 * @param task - the task
+	 */
+	Future<Void> runTaskLater(int delayMilliseconds, String errorDescription, TabFeature feature, String type, Runnable task);
+	
+	/**
+	 * Runs task with a delay and measures how long it took to process
+	 * @param delayMilliseconds - how long to run the task after
+	 * @param errorDescription - description to use if this task throws an error
+	 * @param feature - feature to add cpu usage to
+	 * @param type - usage type to add cpu usage to
+	 * @param task - the task
+	 */
+	Future<Void> runTaskLater(int delayMilliseconds, String errorDescription, String feature, String type, Runnable task);
+	
+	Future<Void> runTaskLater(int delayMilliseconds, String errorDescription, Runnable task);
+}

api/src/main/java/me/neznamy/tab/api/team/TeamManager.java

@@ -0,0 +1,113 @@
+package me.neznamy.tab.api.team;
+
+import me.neznamy.tab.api.TabPlayer;
+
+public interface TeamManager {
+
+	/**
+	 * Makes player's NameTag globally invisible
+	 * @see #showNametag(TabPlayer)
+	 * @see #hasHiddenNametag(TabPlayer)
+	 */
+	void hideNametag(TabPlayer player);
+
+	/**
+	 * Hides player's NameTag for specified player until it's shown again
+	 * @param viewer - player to hide NameTag for
+	 */
+	void hideNametag(TabPlayer player, TabPlayer viewer);
+
+	/**
+	 * Makes player's NameTag visible again
+	 * @see #hideNametag(TabPlayer)
+	 * @see #hasHiddenNametag(TabPlayer)
+	 */
+	void showNametag(TabPlayer player);
+
+	/**
+	 * Shows player's NameTag for specified viewer if it was hidden before
+	 * @param viewer - player to show NameTag back for
+	 */
+	void showNametag(TabPlayer player, TabPlayer viewer);
+
+	/**
+	 * Return whether player has hidden NameTag or not
+	 * @return Whether player has hidden NameTag or not
+	 * @see #hideNametag(TabPlayer)
+	 * @see #showNametag(TabPlayer)
+	 */
+	boolean hasHiddenNametag(TabPlayer player);
+
+	/**
+	 * Returns true if NameTag is hidden for specified viewer, false if not
+	 * @param viewer - player to check visibility status for
+	 * @return true if hidden, false if not
+	 */
+	boolean hasHiddenNametag(TabPlayer player, TabPlayer viewer);
+	
+	/**
+	 * Unregisters player's team and no longer handles it, as well as disables anti-override for teams.
+	 * This can be resumed using resumeTeamHandling(). If team handling was paused already, nothing happens.
+	 */
+	void pauseTeamHandling(TabPlayer player);
+
+	/**
+	 * Resumes team handling if it was before paused using pauseTeamHandling(), if not, nothing happens
+	 */
+	void resumeTeamHandling(TabPlayer player);
+
+	/**
+	 * Returns true if team handling is paused for this player using pauseTeamHandling(), false if not, or
+	 * it was resumed already using resumeTeamHandling
+	 * @return true if paused, false if not
+	 */
+	boolean hasTeamHandlingPaused(TabPlayer player);
+	
+	/**
+	 * Forces new team name for the player until this method is called again with null argument and 
+	 * performs all actions to change player's team name
+	 * @param teamName - forced team name
+	 */
+	void forceTeamName(TabPlayer player, String teamName);
+
+	/**
+	 * Returns forced team name of player or null if not forced
+	 * @return forced team name of player or null if not forced
+	 */
+	String getForcedTeamName(TabPlayer player);
+	
+
+	/**
+	 * Forces collision rule for the player. Setting it to null will remove forced value
+	 * @param collision - forced collision rule
+	 */
+	void setCollisionRule(TabPlayer player, Boolean collision);
+
+	/**
+	 * Returns forced collision rule or null if collision is not forced using setCollisionRule
+	 * @return forced value or null if not forced
+	 */
+	Boolean getCollisionRule(TabPlayer player);
+	
+	/**
+	 * Sends update team's properties packet of player's team to everyone
+	 * @param player - player to update team data of
+	 */
+	void updateTeamData(TabPlayer player);
+	
+	void setPrefix(TabPlayer player, String prefix);
+	
+	void setSuffix(TabPlayer player, String suffix);
+	
+	void resetPrefix(TabPlayer player);
+	
+	void resetSuffix(TabPlayer player);
+	
+	String getCustomPrefix(TabPlayer player);
+	
+	String getCustomSuffix(TabPlayer player);
+	
+	String getOriginalPrefix(TabPlayer player);
+	
+	String getOriginalSuffix(TabPlayer player);
+}

api/src/main/java/me/neznamy/tab/api/team/UnlimitedNametagManager.java

@@ -0,0 +1,32 @@
+package me.neznamy.tab.api.team;
+
+import java.util.List;
+
+import me.neznamy.tab.api.TabPlayer;
+
+public interface UnlimitedNametagManager extends TeamManager {
+
+	void disableArmorStands(TabPlayer player);
+	
+	void enableArmorStands(TabPlayer player);
+	
+	boolean hasDisabledArmorStands(TabPlayer player);
+
+	void setName(TabPlayer player, String customName);
+	
+	void setLine(TabPlayer player, String line, String value);
+
+	void resetName(TabPlayer player);
+	
+	void resetLine(TabPlayer player, String line);
+
+	String getCustomName(TabPlayer player);
+	
+	String getCustomLineValue(TabPlayer player, String line);
+
+	String getOriginalName(TabPlayer player);
+	
+	String getOriginalLineValue(TabPlayer player, String line);
+	
+	List<String> getDefinedLines();
+}

api/src/main/java/me/neznamy/tab/api/util/BiFunctionWithException.java

@@ -0,0 +1,18 @@
+package me.neznamy.tab.api.util;
+
+/**
+ * An interface for BiFunction which can throw an exception.
+ * Used in {@link me.neznamy.tab.api.protocol.PacketBuilder} to 
+ * call build method for packet classes, which may throw an
+ * exception due to reflection.
+ * @param	<A>
+ * 			First function argument
+ * @param	<B>
+ * 			Second function argument
+ * @param	<C>
+ * 			Function return type
+ */
+public interface BiFunctionWithException<A, B, C> {
+
+	C apply(A a, B b) throws ReflectiveOperationException;
+}

api/src/main/java/me/neznamy/tab/api/util/Preconditions.java

@@ -0,0 +1,13 @@
+package me.neznamy.tab.api.util;
+
+public class Preconditions {
+
+    public static void checkNotNull(Object obj, String exceptionMessage){
+        if (obj == null) throw new IllegalArgumentException(exceptionMessage);
+    }
+
+    public static void checkRange(Number number, Number min, Number max){
+        if (number.doubleValue() < min.doubleValue() || number.doubleValue() > max.doubleValue())
+            throw new IllegalArgumentException("Number index out of range (" + min + " - " + max + ")");
+    }
+}

build-logic/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    gradlePluginPortal()
+    mavenCentral()
+}
+
+dependencies {
+    implementation("gradle.plugin.com.github.johnrengelman", "shadow", "7.1.0")
+}

build-logic/src/main/kotlin/tab.base-conventions.gradle.kts

@@ -0,0 +1,30 @@
+import org.apache.tools.ant.filters.ReplaceTokens
+
+plugins {
+    `java-library`
+}
+
+tasks {
+    processResources {
+        filter<ReplaceTokens>("tokens" to mapOf(
+            "name" to rootProject.name,
+            "version" to project.version,
+            "description" to project.description
+        ))
+    }
+    javadoc {
+        options.encoding = Charsets.UTF_8.name()
+        (options as StandardJavadocDocletOptions).addStringOption("Xdoclint:none", "-quiet")
+    }
+    compileJava {
+        options.encoding = Charsets.UTF_8.name()
+        options.release.set(8)
+        options.compilerArgs.addAll(listOf("-nowarn", "-Xlint:-unchecked", "-Xlint:-deprecation"))
+    }
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}

build-logic/src/main/kotlin/tab.platform-conventions.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    id("tab.standard-conventions")
+    id("com.github.johnrengelman.shadow")
+}
+
+tasks {
+    shadowJar {
+        archiveFileName.set("TAB-${project.name}-${project.version}.jar")
+        relocate("org.bstats", "me.neznamy.tab.libs.org.bstats")
+        relocate("org.json.simple", "me.neznamy.tab.libs.org.json.simple")
+    }
+}

build-logic/src/main/kotlin/tab.standard-conventions.gradle.kts

@@ -0,0 +1,31 @@
+import gradle.kotlin.dsl.accessors._4cbb0020bd75d48acc42cabded5fdbb7.publishing
+import org.gradle.api.artifacts.repositories.PasswordCredentials
+import org.gradle.api.publish.maven.MavenPublication
+import org.gradle.kotlin.dsl.get
+import org.gradle.kotlin.dsl.repositories
+
+plugins {
+    id("tab.base-conventions")
+    `maven-publish`
+}
+
+java {
+    withSourcesJar()
+    withJavadocJar()
+}
+
+publishing {
+    repositories {
+        maven {
+            name = "krypton"
+            url = uri("https://repo.kryptonmc.org/releases")
+            credentials(PasswordCredentials::class)
+        }
+    }
+    publications.create<MavenPublication>("mavenJava") {
+        groupId = rootProject.group as String
+        artifactId = "tab-${project.name}"
+        version = rootProject.version as String
+        from(components["java"])
+    }
+}

build.gradle.kts

@@ -0,0 +1,29 @@
+plugins {
+    id("tab.parent")
+}
+
+allprojects {
+    group = "me.neznamy"
+    version = property("projectVersion") as String // from gradle.properties
+    description = "An all-in-one solution that works"
+}
+
+val platforms = setOf(
+    projects.bukkit,
+    projects.bungeecord,
+    projects.krypton,
+    projects.velocity
+).map { it.dependencyProject }
+
+val special = setOf(
+    projects.api,
+    projects.shared
+).map { it.dependencyProject }
+
+subprojects {
+    when (this) {
+        in platforms -> plugins.apply("tab.platform-conventions")
+        in special -> plugins.apply("tab.standard-conventions")
+        else -> plugins.apply("tab.base-conventions")
+    }
+}

bukkit/build.gradle.kts

@@ -0,0 +1,11 @@
+dependencies {
+    implementation(projects.shared)
+    implementation(libs.bstats.bukkit)
+    compileOnly(libs.bukkit)
+    compileOnly(libs.placeholderapi)
+    compileOnly(libs.vault)
+    compileOnly(libs.via)
+    compileOnly(libs.authlib)
+    compileOnly(libs.libsDisguises)
+    compileOnly(libs.essentials)
+}

bukkit/pom.xml

@@ -1,164 +0,0 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
-	<parent>
-		<groupId>me.neznamy</groupId>
-		<artifactId>TAB</artifactId>
-		<version>2.8.11-pre17</version>
-	</parent>
-	<artifactId>bukkit</artifactId>
-
-	<repositories>
-
-		<!-- Spigot API -->
-		<repository>
-			<id>spigot-repo</id>
-			<url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
-		</repository>
-
-		<!-- PlaceholderAPI -->
-		<repository>
-			<id>placeholderapi</id>
-			<url>https://repo.extendedclip.com/content/repositories/placeholderapi/</url>
-		</repository>
-
-		<!-- Vault -->
-		<repository>
-			<id>jitpack.io</id>
-			<url>https://jitpack.io</url>
-		</repository>
-
-		<!-- ViaVersion -->
-		<repository>
-			<id>viaversion</id>
-			<url>https://repo.viaversion.com/</url>
-		</repository>
-
-	</repositories>
-
-	<dependencies>
-
-		<!-- TAB Core -->
-		<dependency>
-			<groupId>me.neznamy</groupId>
-			<artifactId>shared</artifactId>
-			<version>${project.version}</version>
-			<scope>provided</scope>
-			<exclusions>
-				<exclusion>
-					<groupId>com.google.guava</groupId>
-					<artifactId>guava</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>com.github.NEZNAMY</groupId>
-					<artifactId>YamlAssist</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>org.yaml</groupId>
-					<artifactId>snakeyaml</artifactId>
-				</exclusion>
-			</exclusions>
-		</dependency>
-
-		<!-- Spigot API -->
-		<dependency>
-			<groupId>org.spigotmc</groupId>
-			<artifactId>spigot-api</artifactId>
-			<version>1.16.5-R0.1-SNAPSHOT</version>
-			<scope>provided</scope>
-			<exclusions>
-				<exclusion>
-					<groupId>commons-lang</groupId>
-					<artifactId>commons-lang</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>net.md-5</groupId>
-					<artifactId>bungeecord-chat</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>com.google.code.gson</groupId>
-					<artifactId>gson</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>org.yaml</groupId>
-					<artifactId>snakeyaml</artifactId>
-				</exclusion>
-			</exclusions>
-		</dependency>
-
-		<!-- PlaceholderAPI -->
-		<dependency>
-			<groupId>me.clip</groupId>
-			<artifactId>placeholderapi</artifactId>
-			<version>2.10.9</version>
-			<scope>provided</scope>
-			<exclusions>
-				<exclusion>
-					<groupId>org.jetbrains</groupId>
-					<artifactId>annotations</artifactId>
-				</exclusion>
-			</exclusions>
-		</dependency>
-
-		<!-- Vault -->
-		<dependency>
-			<groupId>com.github.MilkBowl</groupId>
-			<artifactId>VaultAPI</artifactId>
-			<version>1.7</version>
-			<scope>provided</scope>
-			<exclusions>
-				<exclusion>
-					<groupId>commons-lang</groupId>
-					<artifactId>commons-lang</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>com.google.code.gson</groupId>
-					<artifactId>gson</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>org.bukkit</groupId>
-					<artifactId>bukkit</artifactId>
-				</exclusion>
-			</exclusions>
-		</dependency>
-
-		<!-- ViaVersion -->
-		<dependency>
-			<groupId>us.myles</groupId>
-			<artifactId>viaversion</artifactId>
-			<version>3.2.0</version>
-			<scope>provided</scope>
-			<exclusions>
-				<exclusion>
-					<groupId>us.myles</groupId>
-					<artifactId>viaversion-common</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>us.myles</groupId>
-					<artifactId>viaversion-bukkit</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>us.myles</groupId>
-					<artifactId>viaversion-bungee</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>us.myles</groupId>
-					<artifactId>viaversion-fabric</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>us.myles</groupId>
-					<artifactId>viaversion-sponge</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>us.myles</groupId>
-					<artifactId>viaversion-velocity</artifactId>
-				</exclusion>
-				<exclusion>
-					<groupId>net.md-5</groupId>
-					<artifactId>bungeecord-chat</artifactId>
-				</exclusion>
-			</exclusions>
-		</dependency>
-	</dependencies>
-</project>

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitEventListener.java

@@ -15,6 +15,12 @@ import me.neznamy.tab.shared.TAB;
  */
 public class BukkitEventListener implements Listener {
 
+	private final Main main;
+	
+	public BukkitEventListener(Main main) {
+		this.main = main;
+	}
+	
 	/**
 	 * Listener to PlayerQuitEvent to remove player data and forward the event to features
 	 * @param e quit event
@@ -32,7 +38,7 @@ public class BukkitEventListener implements Listener {
 	@EventHandler(priority = EventPriority.LOWEST)
 	public void onJoin(PlayerJoinEvent e) {
 		if (TAB.getInstance().isDisabled()) return;
-		TAB.getInstance().getCPUManager().runTask("processing PlayerJoinEvent", () -> TAB.getInstance().getFeatureManager().onJoin(new BukkitTabPlayer(e.getPlayer())));
+		TAB.getInstance().getCPUManager().runTask("processing PlayerJoinEvent", () -> TAB.getInstance().getFeatureManager().onJoin(new BukkitTabPlayer(e.getPlayer(), main.getProtocolVersion(e.getPlayer()))));
 	}
 
 	/**

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitMetrics.java

@@ -1,193 +0,0 @@
-package me.neznamy.tab.platforms.bukkit;
-
-import java.io.File;
-import java.io.IOException;
-import java.lang.reflect.InvocationTargetException;
-import java.util.Timer;
-import java.util.TimerTask;
-import java.util.UUID;
-import java.util.concurrent.Callable;
-import java.util.logging.Level;
-
-import org.bukkit.Bukkit;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.bukkit.plugin.RegisteredServiceProvider;
-import org.bukkit.plugin.ServicePriority;
-import org.json.simple.JSONArray;
-import org.json.simple.JSONObject;
-
-import me.neznamy.tab.shared.ProtocolVersion;
-import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.features.Metrics;
-
-/**
- * bStats metrics for bukkit
- */
-@SuppressWarnings("unchecked")
-public class BukkitMetrics extends Metrics {
-
-	private Main plugin;
-	
-	public BukkitMetrics(Main plugin) {
-		super("https://bStats.org/submitData/bukkit");
-		if (plugin == null) {
-			throw new IllegalArgumentException("Plugin cannot be null!");
-		}
-		this.plugin = plugin;
-
-		// Get the config file
-		File bStatsFolder = new File(plugin.getDataFolder().getParentFile(), "bStats");
-		File configFile = new File(bStatsFolder, "config.yml");
-		YamlConfiguration config = YamlConfiguration.loadConfiguration(configFile);
-		if (!config.isSet("serverUuid")) {
-			config.addDefault("enabled", true);
-			config.addDefault("serverUuid", UUID.randomUUID().toString());
-			config.addDefault("logFailedRequests", false);
-			config.addDefault("logSentData", false);
-			config.addDefault("logResponseStatusText", false);
-			config.options().header(
-					"bStats collects some data for plugin authors like how many servers are using their plugins.\n" +
-							"To honor their work, you should not disable it.\n" +
-							"This has nearly no effect on the server performance!\n" +
-							"Check out https://bStats.org/ to learn more :)"
-					).copyDefaults(true);
-			try {
-				config.save(configFile);
-			} catch (IOException ignored) { }
-		}
-
-		// Load the data
-		enabled = config.getBoolean("enabled", true);
-		serverUUID = config.getString("serverUuid");
-		logFailedRequests = config.getBoolean("logFailedRequests", false);
-		logSentData = config.getBoolean("logSentData", false);
-		logResponseStatusText = config.getBoolean("logResponseStatusText", false);
-
-		if (enabled) {
-			boolean found = false;
-			// Search for all other bStats Metrics classes to see if we are the first one
-			for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
-				try {
-					service.getField("B_STATS_VERSION"); // Our identifier :)
-					found = true; // We aren't the first
-					break;
-				} catch (NoSuchFieldException ignored) { }
-			}
-			// Register our service
-			Bukkit.getServicesManager().register(BukkitMetrics.class, this, plugin, ServicePriority.Normal);
-			if (!found) {
-				// We are the first!
-				startSubmitting();
-			}
-		}
-		addCustomChart(new SimplePie("unlimited_nametag_mode_enabled", new Callable<String>() {
-			public String call() {
-				return TAB.getInstance().getFeatureManager().isFeatureEnabled("nametagx") ? "Yes" : "No";
-			}
-		}));
-		addCustomChart(new SimplePie("placeholderapi", new Callable<String>() {
-			public String call() {
-				return Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI") ? "Yes" : "No";
-			}
-		}));
-		addCustomChart(new SimplePie("permission_system", new Callable<String>() {
-			public String call() {
-				return TAB.getInstance().getPermissionPlugin().getName();
-			}
-		}));
-		addCustomChart(new SimplePie("server_version", new Callable<String>() {
-			public String call() {
-				return "1." + ProtocolVersion.SERVER_VERSION.getMinorVersion() + ".x";
-			}
-		}));
-	}
-
-	private void startSubmitting() {
-		Timer timer = new Timer(true); // We use a timer cause the Bukkit scheduler is affected by server lags
-		timer.scheduleAtFixedRate(new TimerTask() {
-			@Override
-			public void run() {
-				if (!plugin.isEnabled()) { // Plugin was disabled
-					timer.cancel();
-					return;
-				}
-				// Nevertheless we want our code to run in the Bukkit main thread, so we have to use the Bukkit scheduler
-				// Don't be afraid! The connection to the bStats server is still async, only the stats collection is sync ;)
-				Bukkit.getScheduler().runTask(plugin, () -> submitData());
-			}
-		}, 1000*60*5, 1000*60*30);
-		// Submit the data every 30 minutes, first time after 5 minutes to give other plugins enough time to start
-		// WARNING: Changing the frequency has no effect but your plugin WILL be blocked/deleted!
-		// WARNING: Just don't do it!
-	}
-
-	private JSONObject getServerData() {
-		// Minecraft specific data
-		int playerAmount = TAB.getInstance().getPlayers().size();
-		int onlineMode = Bukkit.getOnlineMode() ? 1 : 0;
-		String bukkitVersion = Bukkit.getVersion();
-
-		// OS/Java specific data
-		String javaVersion = System.getProperty("java.version");
-		String osName = System.getProperty("os.name");
-		String osArch = System.getProperty("os.arch");
-		String osVersion = System.getProperty("os.version");
-		int coreCount = Runtime.getRuntime().availableProcessors();
-
-		JSONObject data = new JSONObject();
-
-		data.put("serverUUID", serverUUID);
-
-		data.put("playerAmount", playerAmount);
-		data.put("onlineMode", onlineMode);
-		data.put("bukkitVersion", bukkitVersion);
-
-		data.put("javaVersion", javaVersion);
-		data.put("osName", osName);
-		data.put("osArch", osArch);
-		data.put("osVersion", osVersion);
-		data.put("coreCount", coreCount);
-
-		return data;
-	}
-
-	private void submitData() {
-		JSONObject data = getServerData();
-
-		JSONArray pluginData = new JSONArray();
-		// Search for all other bStats Metrics classes to get their plugin data
-		for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
-			try {
-				service.getField("B_STATS_VERSION"); // Our identifier :)
-
-				for (RegisteredServiceProvider<?> provider : Bukkit.getServicesManager().getRegistrations(service)) {
-					try {
-						pluginData.add(provider.getService().getMethod("getPluginData").invoke(provider.getProvider()));
-					} catch (NullPointerException ignored) {
-					} catch (NoSuchMethodException ignored) { 
-					} catch (IllegalAccessException ignored) { 
-					} catch (InvocationTargetException ignored) {
-					}
-				}
-			} catch (NoSuchFieldException ignored) { }
-		}
-
-		data.put("plugins", pluginData);
-
-		// Create a new thread for the connection to the bStats server
-		new Thread(new Runnable() {
-
-			public void run() {
-				try {
-					// Send the data
-					sendData(data, logResponseStatusText);
-				} catch (Throwable e) {
-					// Something went wrong! :(
-					if (logFailedRequests) {
-						plugin.getLogger().log(Level.WARNING, "Could not submit plugin stats of " + plugin.getName(), e);
-					}
-				}
-			}
-		}).start();
-	}
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPacketBuilder.java

@@ -1,8 +1,12 @@
 package me.neznamy.tab.platforms.bukkit;
 
+import java.lang.reflect.Array;
 import java.util.ArrayList;
+import java.util.Collection;
+import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.UUID;
 
@@ -10,436 +14,387 @@ import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.entity.EntityType;
 
-import io.netty.buffer.ByteBuf;
-import io.netty.buffer.Unpooled;
-import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
-import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
-import me.neznamy.tab.shared.ProtocolVersion;
-import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.packets.EnumChatFormat;
-import me.neznamy.tab.shared.packets.IChatBaseComponent;
-import me.neznamy.tab.shared.packets.PacketBuilder;
-import me.neznamy.tab.shared.packets.PacketPlayOutBoss;
-import me.neznamy.tab.shared.packets.PacketPlayOutBoss.Action;
-import me.neznamy.tab.shared.packets.PacketPlayOutChat;
-import me.neznamy.tab.shared.packets.PacketPlayOutPlayerInfo;
-import me.neznamy.tab.shared.packets.PacketPlayOutPlayerInfo.EnumGamemode;
-import me.neznamy.tab.shared.packets.PacketPlayOutPlayerInfo.EnumPlayerInfoAction;
-import me.neznamy.tab.shared.packets.PacketPlayOutPlayerInfo.PlayerInfoData;
-import me.neznamy.tab.shared.packets.PacketPlayOutPlayerListHeaderFooter;
-import me.neznamy.tab.shared.packets.PacketPlayOutScoreboardDisplayObjective;
-import me.neznamy.tab.shared.packets.PacketPlayOutScoreboardObjective;
-import me.neznamy.tab.shared.packets.PacketPlayOutScoreboardObjective.EnumScoreboardHealthDisplay;
-import me.neznamy.tab.shared.packets.PacketPlayOutScoreboardScore;
-import me.neznamy.tab.shared.packets.PacketPlayOutScoreboardTeam;
-import me.neznamy.tab.shared.packets.PacketPlayOutTitle;
-import me.neznamy.tab.shared.packets.IChatBaseComponent.ClickAction;
-import me.neznamy.tab.shared.rgb.TextColor;
-import us.myles.ViaVersion.api.type.Type;
-import us.myles.viaversion.libs.gson.JsonParser;
+import com.google.gson.JsonObject;
+import com.mojang.authlib.GameProfile;
+import com.mojang.authlib.properties.PropertyMap;
 
-@SuppressWarnings("unchecked")
-public class BukkitPacketBuilder implements PacketBuilder {
+import me.neznamy.tab.api.ProtocolVersion;
+import me.neznamy.tab.api.chat.ChatClickable.EnumClickAction;
+import me.neznamy.tab.api.chat.ChatComponentEntity;
+import me.neznamy.tab.api.chat.ChatHoverable.EnumHoverAction;
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.chat.IChatBaseComponent;
+import me.neznamy.tab.api.chat.TextColor;
+import me.neznamy.tab.api.protocol.PacketBuilder;
+import me.neznamy.tab.api.protocol.PacketPlayOutBoss;
+import me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action;
+import me.neznamy.tab.api.protocol.PacketPlayOutChat;
+import me.neznamy.tab.api.protocol.PacketPlayOutPlayerInfo;
+import me.neznamy.tab.api.protocol.PacketPlayOutPlayerInfo.EnumGamemode;
+import me.neznamy.tab.api.protocol.PacketPlayOutPlayerInfo.EnumPlayerInfoAction;
+import me.neznamy.tab.api.protocol.PacketPlayOutPlayerInfo.PlayerInfoData;
+import me.neznamy.tab.api.protocol.PacketPlayOutPlayerListHeaderFooter;
+import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardDisplayObjective;
+import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardObjective;
+import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardScore;
+import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardTeam;
+import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutEntityDestroy;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutEntityMetadata;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutEntityTeleport;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutSpawnEntityLiving;
+import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
+
+@SuppressWarnings({"unchecked", "rawtypes"})
+public class BukkitPacketBuilder extends PacketBuilder {
 
 	//nms storage
-	private NMSStorage nms;
-	
+	private final NMSStorage nms = NMSStorage.getInstance();
+
 	//entity type ids
-	private Map<EntityType, Integer> entityIds = new HashMap<EntityType, Integer>();
+	private final EnumMap<EntityType, Integer> entityIds = new EnumMap<>(EntityType.class);
+
+	private final Map<IChatBaseComponent, Object> componentCacheModern = new HashMap<>();
+	private final Map<IChatBaseComponent, Object> componentCacheLegacy = new HashMap<>();
+
+	private Object emptyScoreboard;
+	private Object dummyEntity;
 
 	/**
-	 * Constructs new instance with given parameter
-	 * @param nms - nms storage
+	 * Constructs new instance
 	 */
-	public BukkitPacketBuilder(NMSStorage nms) {
-		this.nms = nms;
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 13) {
+	public BukkitPacketBuilder() {
+		if (nms.getMinorVersion() >= 13) {
 			entityIds.put(EntityType.ARMOR_STAND, 1);
 			entityIds.put(EntityType.WITHER, 83);
 		} else {
 			entityIds.put(EntityType.WITHER, 64);
-			if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 8){
+			if (nms.getMinorVersion() >= 8){
 				entityIds.put(EntityType.ARMOR_STAND, 30);
 			}
 		}
+		try {
+			emptyScoreboard = nms.newScoreboard.newInstance();
+		} catch (ReflectiveOperationException e) {
+			Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Failed to create instance of \"Scoreboard\""));
+		}
+		if (nms.getMinorVersion() >= 8) {
+			try {
+				dummyEntity = nms.newEntityArmorStand.newInstance(nms.World_getHandle.invoke(Bukkit.getWorlds().get(0)), 0, 0, 0);
+			} catch (ReflectiveOperationException e) {
+				Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Failed to create instance of \"EntityArmorStand\""));
+			}
+		}
+		buildMap.put(PacketPlayOutEntityMetadata.class, (packet, version) -> build((PacketPlayOutEntityMetadata)packet));
+		buildMap.put(PacketPlayOutEntityTeleport.class, (packet, version) -> build((PacketPlayOutEntityTeleport)packet));
+		buildMap.put(PacketPlayOutEntityDestroy.class, (packet, version) -> build((PacketPlayOutEntityDestroy)packet));
+		buildMap.put(PacketPlayOutSpawnEntityLiving.class, (packet, version) -> build((PacketPlayOutSpawnEntityLiving)packet));
 	}
-	
-	@Override
-	public Object build(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws Exception {
-		if (nms.minorVersion >= 9) {
-			//1.9+ server
-			return buildBossPacket19(packet, clientVersion);
-		}
-		if (clientVersion.getMinorVersion() >= 9 && Bukkit.getPluginManager().isPluginEnabled("ViaVersion")) {
-			//1.9+ client on 1.8 server
-			//technically redundant VV check as there is no other way to get 1.9 client on 1.8 server
-			return buildBossPacketVia(packet, clientVersion);
-		}
 
+	@Override
+	public Object build(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		if (nms.getMinorVersion() >= 9 || clientVersion.getMinorVersion() >= 9) {
+			//1.9+ server or client, handled by bukkit api or ViaVersion
+			return packet;
+		}
 		//<1.9 client and server
 		return buildBossPacketEntity(packet, clientVersion);
 	}
 
-	/**
-	 * Build 1.9 boss packet
-	 * @param packet - packet to build
-	 * @param clientVersion - client version
-	 * @return 1.9 bossbar packet
-	 * @throws Exception - if something fails
-	 */
-	private Object buildBossPacket19(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws Exception {
-		Object nmsPacket = nms.newPacketPlayOutBoss.newInstance();
-		nms.PacketPlayOutBoss_UUID.set(nmsPacket, packet.id);
-		nms.PacketPlayOutBoss_ACTION.set(nmsPacket, Enum.valueOf(nms.PacketPlayOutBoss_Action, packet.operation.toString()));
-		nms.PacketPlayOutBoss_PROGRESS.set(nmsPacket, packet.pct);
-		nms.PacketPlayOutBoss_NAME.set(nmsPacket, packet.name == null ? null : toNMSComponent(IChatBaseComponent.optimizedComponent(packet.name), clientVersion));
-		nms.PacketPlayOutBoss_COLOR.set(nmsPacket, packet.color == null ? null : Enum.valueOf(nms.BarColor, packet.color.toString()));
-		nms.PacketPlayOutBoss_STYLE.set(nmsPacket, packet.overlay == null ? null : Enum.valueOf(nms.BarStyle, packet.overlay.toString()));
-		nms.PacketPlayOutBoss_DARKEN_SKY.set(nmsPacket, packet.darkenScreen);
-		nms.PacketPlayOutBoss_PLAY_MUSIC.set(nmsPacket, packet.playMusic);
-		nms.PacketPlayOutBoss_CREATE_FOG.set(nmsPacket, packet.createWorldFog);
-		return nmsPacket;
-	}
-
-	/**
-	 * Builds 1.9 bossbar packet bytebuf using viaversion
-	 * @param packet - packet to build
-	 * @param clientVersion - client version
-	 * @return bytebuf with 1.9 bossbar packet content
-	 * @throws Exception - if something fails
-	 */
-	private ByteBuf buildBossPacketVia(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws Exception {
-		if (clientVersion == ProtocolVersion.UNKNOWN) return null; //preventing disconnect if packet ID changes and users do not update
-		try {
-			ByteBuf buf = Unpooled.buffer();
-			Type.VAR_INT.writePrimitive(buf, clientVersion.getMinorVersion() == 15 ? 0x0D : 0x0C);
-			Type.UUID.write(buf, packet.id);
-			Type.VAR_INT.writePrimitive(buf, packet.operation.ordinal());
-			switch (packet.operation) {
-			case ADD:
-				Type.COMPONENT.write(buf, JsonParser.parseString(IChatBaseComponent.optimizedComponent(packet.name).toString(clientVersion)));
-				Type.FLOAT.writePrimitive(buf, packet.pct);
-				Type.VAR_INT.writePrimitive(buf, packet.color.ordinal());
-				Type.VAR_INT.writePrimitive(buf, packet.overlay.ordinal());
-				Type.BYTE.write(buf, packet.getFlags());
-				break;
-			case REMOVE:
-				break;
-			case UPDATE_PCT:
-				Type.FLOAT.writePrimitive(buf, packet.pct);
-				break;
-			case UPDATE_NAME:
-				Type.COMPONENT.write(buf, JsonParser.parseString(IChatBaseComponent.optimizedComponent(packet.name).toString(clientVersion)));
-				break;
-			case UPDATE_STYLE:
-				Type.VAR_INT.writePrimitive(buf, packet.color.ordinal());
-				Type.VAR_INT.writePrimitive(buf, packet.overlay.ordinal());
-				break;
-			case UPDATE_PROPERTIES:
-				Type.BYTE.write(buf, packet.getFlags());
-				break;
-			default:
-				break;
-			}
-			return buf;
-		} catch (Throwable t) {
-			return TAB.getInstance().getErrorManager().printError(null, "Failed to create 1.9 bossbar packet using ViaVersion v" + Bukkit.getPluginManager().getPlugin("ViaVersion").getDescription().getVersion() + ". Is it the latest version?", t);
+	@Override
+	public Object build(PacketPlayOutChat packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		Object component = toNMSComponent(packet.getMessage(), clientVersion);
+		if (nms.getMinorVersion() >= 16) {
+			return nms.newPacketPlayOutChat.newInstance(component, nms.ChatMessageType_values[packet.getType().ordinal()], UUID.randomUUID());
 		}
-	}
-
-	/**
-	 * Builds entity bossbar packet
-	 * @param packet - packet to build
-	 * @param clientVersion - client version
-	 * @return entity bossbar packet
-	 * @throws Exception - if something fails
-	 */
-	private Object buildBossPacketEntity(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws Exception {
-		if (packet.operation == Action.UPDATE_STYLE) return null; //nothing to do here
-
-		int entityId = Math.abs(packet.id.hashCode());
-		if (packet.operation == Action.REMOVE) {
-			return buildEntityDestroyPacket(entityId);
+		if (nms.getMinorVersion() >= 12) {
+			return nms.newPacketPlayOutChat.newInstance(component, Enum.valueOf((Class<Enum>) nms.ChatMessageType, packet.getType().toString()));
 		}
-		DataWatcher w = new DataWatcher();
-		if (packet.operation == Action.UPDATE_PCT || packet.operation == Action.ADD) {
-			float health = (float)300*packet.pct;
-			if (health == 0) health = 1;
-			w.helper().setHealth(health);
+		if (nms.getMinorVersion() >= 8) {
+			return nms.newPacketPlayOutChat.newInstance(component, (byte) packet.getType().ordinal());
 		}
-		if (packet.operation == Action.UPDATE_NAME || packet.operation == Action.ADD) {
-			w.helper().setCustomName(packet.name, clientVersion);
-		}
-		if (packet.operation == Action.ADD) {
-			w.helper().setEntityFlags((byte) 32);
-			return buildEntitySpawnPacket(entityId, null, EntityType.WITHER, new Location(null, 0,0,0), w);
-		} else {
-			return buildEntityMetadataPacket(entityId, w);
+		if (nms.getMinorVersion() == 7) {
+			return nms.newPacketPlayOutChat.newInstance(component);
 		}
+		throw new IllegalStateException("Not supported on <1.7");
 	}
 
 	@Override
-	public Object build(PacketPlayOutChat packet, ProtocolVersion clientVersion) throws Exception {
-		Object nmsPacket = nms.newPacketPlayOutChat.newInstance();
-		nms.PacketPlayOutChat_MESSAGE.set(nmsPacket, stringToComponent(packet.message.toString(clientVersion))); //using old method for chat packets due to broken item/entity deserializer
-		if (nms.minorVersion >= 12) {
-			nms.PacketPlayOutChat_POSITION.set(nmsPacket, Enum.valueOf(nms.ChatMessageType, packet.type.toString()));
-		} else if (nms.minorVersion >= 8) {
-			nms.PacketPlayOutChat_POSITION.set(nmsPacket, (byte)packet.type.ordinal());
-		}
-		if (nms.minorVersion >= 16) {
-			nms.PacketPlayOutChat_SENDER.set(nmsPacket, UUID.randomUUID());
-		}
-		return nmsPacket;
-	}
-
-	@Override
-	public Object build(PacketPlayOutPlayerInfo packet, ProtocolVersion clientVersion) throws Exception {
-		if (nms.minorVersion < 8) return null;
-		Object nmsPacket = nms.newPacketPlayOutPlayerInfo.newInstance();
-		nms.PacketPlayOutPlayerInfo_ACTION.set(nmsPacket, Enum.valueOf(nms.EnumPlayerInfoAction, packet.action.toString()));
-		List<Object> items = new ArrayList<Object>();
-		for (PlayerInfoData data : packet.entries) {
-			Object profile = nms.newGameProfile.newInstance(data.uniqueId, data.name);
-			if (data.skin != null) nms.PropertyMap_putAll.invoke(nms.GameProfile_PROPERTIES.get(profile), data.skin);
+	public Object build(PacketPlayOutPlayerInfo packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		if (nms.getMinorVersion() < 8) return null;
+		Object nmsPacket = nms.newPacketPlayOutPlayerInfo.newInstance(nms.EnumPlayerInfoAction_values[packet.getAction().ordinal()], Array.newInstance(nms.EntityPlayer, 0));
+		List<Object> items = new ArrayList<>();
+		for (PlayerInfoData data : packet.getEntries()) {
+			GameProfile profile = new GameProfile(data.getUniqueId(), data.getName());
+			if (data.getSkin() != null) profile.getProperties().putAll((PropertyMap) data.getSkin());
+			List<Object> parameters = new ArrayList<>();
 			if (nms.newPlayerInfoData.getParameterCount() == 5) {
-				items.add(nms.newPlayerInfoData.newInstance(nms.newPacketPlayOutPlayerInfo.newInstance(), profile, data.latency, data.gameMode == null ? null : Enum.valueOf(nms.EnumGamemode, data.gameMode.toString()), 
-						data.displayName == null ? null : toNMSComponent(data.displayName, clientVersion)));
-			} else {
-				//1.8.8 paper
-				items.add(nms.newPlayerInfoData.newInstance(profile, data.latency, data.gameMode == null ? null : Enum.valueOf(nms.EnumGamemode, data.gameMode.toString()), 
-						data.displayName == null ? null : toNMSComponent(data.displayName, clientVersion)));
+				parameters.add(nmsPacket);
 			}
+			parameters.add(profile);
+			parameters.add(data.getLatency());
+			parameters.add(data.getGameMode() == null ? null : nms.EnumGamemode_values[nms.EnumGamemode_values.length-EnumGamemode.values().length+data.getGameMode().ordinal()]); //not_set was removed in 1.17
+			parameters.add(data.getDisplayName() == null ? null : toNMSComponent(data.getDisplayName(), clientVersion));
+			items.add(nms.newPlayerInfoData.newInstance(parameters.toArray()));
 		}
-		nms.PacketPlayOutPlayerInfo_PLAYERS.set(nmsPacket, items);
+		nms.setField(nmsPacket, nms.PacketPlayOutPlayerInfo_PLAYERS, items);
 		return nmsPacket;
 	}
 
 	@Override
-	public Object build(PacketPlayOutPlayerListHeaderFooter packet, ProtocolVersion clientVersion) throws Exception {
+	public Object build(PacketPlayOutPlayerListHeaderFooter packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		if (nms.getMinorVersion() < 8) return null;
+		if (nms.newPacketPlayOutPlayerListHeaderFooter.getParameterCount() == 2) {
+			return nms.newPacketPlayOutPlayerListHeaderFooter.newInstance(toNMSComponent(packet.getHeader(), clientVersion), toNMSComponent(packet.getFooter(), clientVersion));
+		}
 		Object nmsPacket = nms.newPacketPlayOutPlayerListHeaderFooter.newInstance();
-		nms.PacketPlayOutPlayerListHeaderFooter_HEADER.set(nmsPacket, toNMSComponent(packet.header, clientVersion));
-		nms.PacketPlayOutPlayerListHeaderFooter_FOOTER.set(nmsPacket, toNMSComponent(packet.footer, clientVersion));
+		nms.setField(nmsPacket, nms.PacketPlayOutPlayerListHeaderFooter_HEADER, toNMSComponent(packet.getHeader(), clientVersion));
+		nms.setField(nmsPacket, nms.PacketPlayOutPlayerListHeaderFooter_FOOTER, toNMSComponent(packet.getFooter(), clientVersion));
 		return nmsPacket;
 	}
 
 	@Override
-	public Object build(PacketPlayOutScoreboardDisplayObjective packet, ProtocolVersion clientVersion) throws Exception {
-		Object nmsPacket = nms.newPacketPlayOutScoreboardDisplayObjective.newInstance();
-		nms.PacketPlayOutScoreboardDisplayObjective_POSITION.set(nmsPacket, packet.slot);
-		nms.PacketPlayOutScoreboardDisplayObjective_OBJECTIVENAME.set(nmsPacket, packet.objectiveName);
-		return nmsPacket;
+	public Object build(PacketPlayOutScoreboardDisplayObjective packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		return nms.newPacketPlayOutScoreboardDisplayObjective.newInstance(packet.getSlot(), newScoreboardObjective(packet.getObjectiveName()));
 	}
 
 	@Override
-	public Object build(PacketPlayOutScoreboardObjective packet, ProtocolVersion clientVersion) throws Exception {
-		String displayName = packet.displayName;
-		if (clientVersion.getMinorVersion() < 13) {
-			displayName = cutTo(displayName, 32);
+	public Object build(PacketPlayOutScoreboardObjective packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		String displayName = clientVersion.getMinorVersion() < 13 ? cutTo(packet.getDisplayName(), 32) : packet.getDisplayName();
+		if (nms.getMinorVersion() >= 13) {
+			return nms.newPacketPlayOutScoreboardObjective.newInstance(nms.newScoreboardObjective.newInstance(null, packet.getObjectiveName(), null, 
+					toNMSComponent(IChatBaseComponent.optimizedComponent(displayName), clientVersion), 
+					packet.getRenderType() == null ? null : nms.EnumScoreboardHealthDisplay_values[packet.getRenderType().ordinal()]), 
+					packet.getMethod());
 		}
+
 		Object nmsPacket = nms.newPacketPlayOutScoreboardObjective.newInstance();
-		nms.PacketPlayOutScoreboardObjective_OBJECTIVENAME.set(nmsPacket, packet.objectiveName);
-		if (nms.minorVersion >= 13) {
-			nms.PacketPlayOutScoreboardObjective_DISPLAYNAME.set(nmsPacket, toNMSComponent(IChatBaseComponent.optimizedComponent(displayName), clientVersion));
-		} else {
-			nms.PacketPlayOutScoreboardObjective_DISPLAYNAME.set(nmsPacket, displayName);
+		nms.setField(nmsPacket, nms.PacketPlayOutScoreboardObjective_OBJECTIVENAME, packet.getObjectiveName());
+		nms.setField(nmsPacket, nms.PacketPlayOutScoreboardObjective_DISPLAYNAME, displayName);
+		if (nms.getMinorVersion() >= 8 && packet.getRenderType() != null) {
+			nms.setField(nmsPacket, nms.PacketPlayOutScoreboardObjective_RENDERTYPE, Enum.valueOf((Class<Enum>) nms.EnumScoreboardHealthDisplay, packet.getRenderType().toString()));
 		}
-		if (nms.PacketPlayOutScoreboardObjective_RENDERTYPE != null && packet.renderType != null) {
-			if (nms.minorVersion >= 8) {
-				nms.PacketPlayOutScoreboardObjective_RENDERTYPE.set(nmsPacket, Enum.valueOf(nms.EnumScoreboardHealthDisplay, packet.renderType.toString()));
-			} else {
-				nms.PacketPlayOutScoreboardObjective_RENDERTYPE.set(nmsPacket, packet.renderType.ordinal());
-			}
-		}
-		nms.PacketPlayOutScoreboardObjective_METHOD.set(nmsPacket, packet.method);
+		nms.setField(nmsPacket, nms.PacketPlayOutScoreboardObjective_METHOD, packet.getMethod());
 		return nmsPacket;
 	}
 
 	@Override
-	public Object build(PacketPlayOutScoreboardScore packet, ProtocolVersion clientVersion) throws Exception {
-		if (nms.minorVersion >= 13) {
-			return nms.newPacketPlayOutScoreboardScore_1_13.newInstance(Enum.valueOf(nms.EnumScoreboardAction, packet.action.toString()), packet.objectiveName, packet.player, packet.score);
+	public Object build(PacketPlayOutScoreboardScore packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		if (nms.getMinorVersion() >= 13) {
+			return nms.newPacketPlayOutScoreboardScore_1_13.newInstance(nms.EnumScoreboardAction_values[packet.getAction().ordinal()], packet.getObjectiveName(), packet.getPlayer(), packet.getScore());
 		}
-		if (packet.action == PacketPlayOutScoreboardScore.Action.REMOVE) {
-			return nms.newPacketPlayOutScoreboardScore_String.newInstance(packet.player);
+		if (packet.getAction() == PacketPlayOutScoreboardScore.Action.REMOVE) {
+			return nms.newPacketPlayOutScoreboardScore_String.newInstance(packet.getPlayer());
 		}
-		Object nmsPacket = nms.newPacketPlayOutScoreboardScore0.newInstance();
-		nms.PacketPlayOutScoreboardScore_PLAYER.set(nmsPacket, packet.player);
-		nms.PacketPlayOutScoreboardScore_OBJECTIVENAME.set(nmsPacket, packet.objectiveName);
-		nms.PacketPlayOutScoreboardScore_SCORE.set(nmsPacket, packet.score);
-		if (nms.minorVersion >= 8) {
-			nms.PacketPlayOutScoreboardScore_ACTION.set(nmsPacket, Enum.valueOf(nms.EnumScoreboardAction, packet.action.toString()));
-		} else {
-			nms.PacketPlayOutScoreboardScore_ACTION.set(nmsPacket, packet.action.ordinal());
+		Object score = nms.newScoreboardScore.newInstance(emptyScoreboard, newScoreboardObjective(packet.getObjectiveName()), packet.getPlayer());
+		nms.ScoreboardScore_setScore.invoke(score, packet.getScore());
+		if (nms.getMinorVersion() >= 8) {
+			return nms.newPacketPlayOutScoreboardScore.newInstance(score);
 		}
-		return nmsPacket;
+		return nms.newPacketPlayOutScoreboardScore.newInstance(score, 0);
 	}
 
 	@Override
-	public Object build(PacketPlayOutScoreboardTeam packet, ProtocolVersion clientVersion) throws Exception {
-		String prefix = packet.playerPrefix;
-		String suffix = packet.playerSuffix;
+	public Object build(PacketPlayOutScoreboardTeam packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		if (nms.PacketPlayOutScoreboardTeam == null) return null; //fabric
+		Object team = nms.newScoreboardTeam.newInstance(emptyScoreboard, packet.getName());
+		String prefix = packet.getPlayerPrefix();
+		String suffix = packet.getPlayerSuffix();
 		if (clientVersion.getMinorVersion() < 13) {
 			prefix = cutTo(prefix, 16);
 			suffix = cutTo(suffix, 16);
 		}
-		Object nmsPacket = nms.newPacketPlayOutScoreboardTeam.newInstance();
-		nms.PacketPlayOutScoreboardTeam_NAME.set(nmsPacket, packet.name);
-		if (nms.minorVersion >= 13) {
-			nms.PacketPlayOutScoreboardTeam_DISPLAYNAME.set(nmsPacket, toNMSComponent(IChatBaseComponent.optimizedComponent(packet.name), clientVersion));
-			if (prefix != null && prefix.length() > 0) nms.PacketPlayOutScoreboardTeam_PREFIX.set(nmsPacket, toNMSComponent(IChatBaseComponent.optimizedComponent(prefix), clientVersion));
-			if (suffix != null && suffix.length() > 0) nms.PacketPlayOutScoreboardTeam_SUFFIX.set(nmsPacket, toNMSComponent(IChatBaseComponent.optimizedComponent(suffix), clientVersion));
-			EnumChatFormat format = packet.color != null ? packet.color : EnumChatFormat.lastColorsOf(prefix);
-			nms.PacketPlayOutScoreboardTeam_CHATFORMAT.set(nmsPacket, Enum.valueOf(nms.EnumChatFormat, format.toString()));
+		((Collection<String>)nms.ScoreboardTeam_getPlayerNameSet.invoke(team)).addAll(packet.getPlayers());
+		nms.ScoreboardTeam_setAllowFriendlyFire.invoke(team, (packet.getOptions() & 0x1) > 0);
+		nms.ScoreboardTeam_setCanSeeFriendlyInvisibles.invoke(team, (packet.getOptions() & 0x2) > 0);
+		if (nms.getMinorVersion() >= 13) {
+			createTeamModern(packet, clientVersion, team, prefix, suffix);
 		} else {
-			nms.PacketPlayOutScoreboardTeam_DISPLAYNAME.set(nmsPacket, packet.name);
-			nms.PacketPlayOutScoreboardTeam_PREFIX.set(nmsPacket, prefix);
-			nms.PacketPlayOutScoreboardTeam_SUFFIX.set(nmsPacket, suffix);
+			createTeamLegacy(packet, team, prefix, suffix);
 		}
-		if (nms.PacketPlayOutScoreboardTeam_VISIBILITY != null) nms.PacketPlayOutScoreboardTeam_VISIBILITY.set(nmsPacket, packet.nametagVisibility);
-		if (nms.PacketPlayOutScoreboardTeam_COLLISION != null) nms.PacketPlayOutScoreboardTeam_COLLISION.set(nmsPacket, packet.collisionRule);
-		nms.PacketPlayOutScoreboardTeam_PLAYERS.set(nmsPacket, packet.players);
-		nms.PacketPlayOutScoreboardTeam_ACTION.set(nmsPacket, packet.method);
-		nms.PacketPlayOutScoreboardTeam_SIGNATURE.set(nmsPacket, packet.options);
-		return nmsPacket;
+		if (nms.getMinorVersion() >= 17) {
+			switch (packet.getMethod()) {
+			case 0:
+				return nms.PacketPlayOutScoreboardTeam_ofBoolean.invoke(null, team, true);
+			case 1:
+				return nms.PacketPlayOutScoreboardTeam_of.invoke(null, team);
+			case 2:
+				return nms.PacketPlayOutScoreboardTeam_ofBoolean.invoke(null, team, false);
+			case 3:
+				return nms.PacketPlayOutScoreboardTeam_ofString.invoke(null, team, packet.getPlayers().toArray(new String[0])[0], nms.PacketPlayOutScoreboardTeam_PlayerAction_values[0]);
+			case 4:
+				return nms.PacketPlayOutScoreboardTeam_ofString.invoke(null, team, packet.getPlayers().toArray(new String[0])[0], nms.PacketPlayOutScoreboardTeam_PlayerAction_values[1]);
+			default:
+				throw new IllegalArgumentException("Invalid action: " + packet.getMethod());
+			}
+		}
+		return nms.newPacketPlayOutScoreboardTeam.newInstance(team, packet.getMethod());
 	}
 
-	@Override
-	public Object build(PacketPlayOutTitle packet, ProtocolVersion clientVersion) throws Exception {
-		if (nms.minorVersion < 8) return null;
-		return nms.newPacketPlayOutTitle.newInstance(Enum.valueOf(nms.EnumTitleAction, packet.action.toString()), 
-				packet.text == null ? null : toNMSComponent(IChatBaseComponent.optimizedComponent(packet.text), clientVersion), packet.fadeIn, packet.stay, packet.fadeOut);
-	}
-	
 	/**
 	 * Builds entity destroy packet with given parameter
-	 * @param ids - entity ids to destroy
 	 * @return destroy packet
-	 * @throws Exception - if reflection fails
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
 	 */
-	public Object buildEntityDestroyPacket(int... ids) throws Exception {
-		return nms.newPacketPlayOutEntityDestroy.newInstance(ids);
+	public Object build(PacketPlayOutEntityDestroy packet) throws ReflectiveOperationException {
+		try {
+			return nms.newPacketPlayOutEntityDestroy.newInstance(packet.getEntities());
+		} catch (IllegalArgumentException e) {
+			//1.17.0
+			return nms.newPacketPlayOutEntityDestroy.newInstance(packet.getEntities()[0]);
+		}
 	}
-	
-	/**
-	 * Builds entity metadata packet with given parameters
-	 * @param entityId - entity id
-	 * @param dataWatcher - datawatcher
-	 * @return metadata packet
-	 * @throws Exception - if reflection fails
-	 */
-	public Object buildEntityMetadataPacket(int entityId, DataWatcher dataWatcher) throws Exception {
-		return nms.newPacketPlayOutEntityMetadata.newInstance(entityId, dataWatcher.toNMS(), true);
+
+	public Object build(PacketPlayOutEntityMetadata packet) throws ReflectiveOperationException {
+		return nms.newPacketPlayOutEntityMetadata.newInstance(packet.getEntityId(), packet.getDataWatcher().toNMS(), true);
 	}
-	
+
 	/**
 	 * Builds entity spawn packet with given parameters
-	 * @param entityId - entity id
-	 * @param uuid - entity uuid
-	 * @param entityType - entity type
-	 * @param loc - location to spawn at
-	 * @param dataWatcher - datawatcher
+	 *
 	 * @return entity spawn packet
-	 * @throws Exception - if reflection fails
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
 	 */
-	public Object buildEntitySpawnPacket(int entityId, UUID uuid, EntityType entityType, Location loc, DataWatcher dataWatcher) throws Exception {
-		Object nmsPacket = nms.newPacketPlayOutSpawnEntityLiving.newInstance();
-		nms.PacketPlayOutSpawnEntityLiving_ENTITYID.set(nmsPacket, entityId);
-		nms.PacketPlayOutSpawnEntityLiving_ENTITYTYPE.set(nmsPacket, entityIds.get(entityType));
-		nms.PacketPlayOutSpawnEntityLiving_YAW.set(nmsPacket, (byte)(loc.getYaw() * 256.0f / 360.0f));
-		nms.PacketPlayOutSpawnEntityLiving_PITCH.set(nmsPacket, (byte)(loc.getPitch() * 256.0f / 360.0f));
-		if (nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER != null) {
-			nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER.set(nmsPacket, dataWatcher.toNMS());
-		}
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 9) {
-			nms.PacketPlayOutSpawnEntityLiving_UUID.set(nmsPacket, uuid);
-			nms.PacketPlayOutSpawnEntityLiving_X.set(nmsPacket, loc.getX());
-			nms.PacketPlayOutSpawnEntityLiving_Y.set(nmsPacket, loc.getY());
-			nms.PacketPlayOutSpawnEntityLiving_Z.set(nmsPacket, loc.getZ());
+	public Object build(PacketPlayOutSpawnEntityLiving packet) throws ReflectiveOperationException {
+		Object nmsPacket;
+		if (nms.getMinorVersion() >= 17) {
+			nmsPacket = nms.newPacketPlayOutSpawnEntityLiving.newInstance(dummyEntity);
 		} else {
-			nms.PacketPlayOutSpawnEntityLiving_X.set(nmsPacket, floor((double)loc.getX()*32));
-			nms.PacketPlayOutSpawnEntityLiving_Y.set(nmsPacket, floor((double)loc.getY()*32));
-			nms.PacketPlayOutSpawnEntityLiving_Z.set(nmsPacket, floor((double)loc.getZ()*32));
+			nmsPacket = nms.newPacketPlayOutSpawnEntityLiving.newInstance();
 		}
-		return nmsPacket;
-	}
-	
-	/**
-	 * Builds entity teleport packet with given parameters
-	 * @param entityId - entity id
-	 * @param location - location to teleport to
-	 * @return entity teleport packet
-	 * @throws Exception - if reflection fails
-	 */
-	public Object buildEntityTeleportPacket(int entityId, Location location) throws Exception {
-		Object nmsPacket = nms.newPacketPlayOutEntityTeleport.newInstance();
-		nms.PacketPlayOutEntityTeleport_ENTITYID.set(nmsPacket, entityId);
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 9) {
-			nms.PacketPlayOutEntityTeleport_X.set(nmsPacket, location.getX());
-			nms.PacketPlayOutEntityTeleport_Y.set(nmsPacket, location.getY());
-			nms.PacketPlayOutEntityTeleport_Z.set(nmsPacket, location.getZ());
+		nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_ENTITYID, packet.getEntityId());
+		nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_ENTITYTYPE, entityIds.get(packet.getEntityType()));
+		nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_YAW, (byte)(packet.getLocation().getYaw() * 256.0f / 360.0f));
+		nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_PITCH, (byte)(packet.getLocation().getPitch() * 256.0f / 360.0f));
+		if (nms.getMinorVersion() <= 14) {
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER, packet.getDataWatcher().toNMS());
+		}
+		if (nms.getMinorVersion() >= 9) {
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_UUID, packet.getUniqueId());
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_X, packet.getLocation().getX());
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_Y, packet.getLocation().getY());
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_Z, packet.getLocation().getZ());
 		} else {
-			nms.PacketPlayOutEntityTeleport_X.set(nmsPacket, floor((double)location.getX()*32));
-			nms.PacketPlayOutEntityTeleport_Y.set(nmsPacket, floor((double)location.getY()*32));
-			nms.PacketPlayOutEntityTeleport_Z.set(nmsPacket, floor((double)location.getZ()*32));
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_X, floor(packet.getLocation().getX()*32));
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_Y, floor(packet.getLocation().getY()*32));
+			nms.setField(nmsPacket, nms.PacketPlayOutSpawnEntityLiving_Z, floor(packet.getLocation().getZ()*32));
 		}
-		nms.PacketPlayOutEntityTeleport_YAW.set(nmsPacket, (byte)((float)location.getYaw()/360*256));
-		nms.PacketPlayOutEntityTeleport_PITCH.set(nmsPacket, (byte)((float)location.getPitch()/360*256));
 		return nmsPacket;
 	}
 
+	/**
+	 * Builds entity teleport packet with given parameters
+	 * @return entity teleport packet
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
+	 */
+	public Object build(PacketPlayOutEntityTeleport packet) throws ReflectiveOperationException {
+		Object nmsPacket;
+		if (nms.getMinorVersion() >= 17) {
+			nmsPacket = nms.newPacketPlayOutEntityTeleport.newInstance(dummyEntity);
+		} else {
+			nmsPacket = nms.newPacketPlayOutEntityTeleport.newInstance();
+		}
+		nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_ENTITYID, packet.getEntityId());
+		if (nms.getMinorVersion() >= 9) {
+			nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_X, packet.getLocation().getX());
+			nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_Y, packet.getLocation().getY());
+			nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_Z, packet.getLocation().getZ());
+		} else {
+			nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_X, floor(packet.getLocation().getX()*32));
+			nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_Y, floor(packet.getLocation().getY()*32));
+			nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_Z, floor(packet.getLocation().getZ()*32));
+		}
+		nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_YAW, (byte) (packet.getLocation().getYaw()/360*256));
+		nms.setField(nmsPacket, nms.PacketPlayOutEntityTeleport_PITCH, (byte) (packet.getLocation().getPitch()/360*256));
+		return nmsPacket;
+	}
+	
+	private void createTeamModern(PacketPlayOutScoreboardTeam packet, ProtocolVersion clientVersion, Object team, String prefix, String suffix) throws ReflectiveOperationException {
+		if (prefix != null) nms.ScoreboardTeam_setPrefix.invoke(team, toNMSComponent(IChatBaseComponent.optimizedComponent(prefix), clientVersion));
+		if (suffix != null) nms.ScoreboardTeam_setSuffix.invoke(team, toNMSComponent(IChatBaseComponent.optimizedComponent(suffix), clientVersion));
+		EnumChatFormat format = packet.getColor() != null ? packet.getColor() : EnumChatFormat.lastColorsOf(prefix);
+		nms.ScoreboardTeam_setColor.invoke(team, nms.EnumChatFormat_values[format.ordinal()]);
+		nms.ScoreboardTeam_setNameTagVisibility.invoke(team, String.valueOf(packet.getNameTagVisibility()).equals("always") ? nms.EnumNameTagVisibility_values[0] : nms.EnumNameTagVisibility_values[1]);
+		nms.ScoreboardTeam_setCollisionRule.invoke(team, String.valueOf(packet.getCollisionRule()).equals("always") ? nms.EnumTeamPush_values[0] : nms.EnumTeamPush_values[1]);
+	}
+
+	private void createTeamLegacy(PacketPlayOutScoreboardTeam packet, Object team, String prefix, String suffix) throws ReflectiveOperationException {
+		if (prefix != null) nms.ScoreboardTeam_setPrefix.invoke(team, prefix);
+		if (suffix != null) nms.ScoreboardTeam_setSuffix.invoke(team, suffix);
+		if (nms.getMinorVersion() >= 8) nms.ScoreboardTeam_setNameTagVisibility.invoke(team, String.valueOf(packet.getNameTagVisibility()).equals("always") ? nms.EnumNameTagVisibility_values[0] : nms.EnumNameTagVisibility_values[1]);
+		if (nms.getMinorVersion() >= 9) nms.ScoreboardTeam_setCollisionRule.invoke(team, String.valueOf(packet.getCollisionRule()).equals("always") ? nms.EnumTeamPush_values[0] : nms.EnumTeamPush_values[1]);
+	}
+	
 	@Override
-	public PacketPlayOutPlayerInfo readPlayerInfo(Object nmsPacket, ProtocolVersion clientVersion) throws Exception {
-		if (nms.minorVersion < 8) return null;
+	public PacketPlayOutPlayerInfo readPlayerInfo(Object nmsPacket, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		if (nms.getMinorVersion() < 8) return null;
 		EnumPlayerInfoAction action = EnumPlayerInfoAction.valueOf(nms.PacketPlayOutPlayerInfo_ACTION.get(nmsPacket).toString());
-		List<PlayerInfoData> listData = new ArrayList<PlayerInfoData>();
+		List<PlayerInfoData> listData = new ArrayList<>();
 		for (Object nmsData : (List<?>) nms.PacketPlayOutPlayerInfo_PLAYERS.get(nmsPacket)) {
-			Object nmsGamemode = nms.PlayerInfoData_GAMEMODE.get(nmsData);
-			EnumGamemode gamemode = nmsGamemode == null ? null : EnumGamemode.valueOf(nmsGamemode.toString());
-			Object profile = nms.PlayerInfoData_PROFILE.get(nmsData);
-			Object nmsComponent = nms.PlayerInfoData_LISTNAME.get(nmsData);
-			IChatBaseComponent listName = fromNMSComponent(nmsComponent);
-			listData.add(new PlayerInfoData((String) nms.GameProfile_NAME.get(profile), (UUID) nms.GameProfile_ID.get(profile), nms.GameProfile_PROPERTIES.get(profile), nms.PlayerInfoData_PING.getInt(nmsData), gamemode, listName));
+			Object nmsGameMode = nms.PlayerInfoData_getGamemode.invoke(nmsData);
+			EnumGamemode gameMode = (nmsGameMode == null) ? null : EnumGamemode.valueOf(nmsGameMode.toString());
+			GameProfile profile = (GameProfile) nms.PlayerInfoData_getProfile.invoke(nmsData);
+			Object nmsComponent = nms.PlayerInfoData_getDisplayName.invoke(nmsData);
+			IChatBaseComponent listName = nmsComponent == null ? null : fromNMSComponent(nmsComponent);
+			PropertyMap map = new PropertyMap();
+			map.putAll(profile.getProperties());
+			listData.add(new PlayerInfoData(profile.getName(), profile.getId(), map, (int) nms.PlayerInfoData_getLatency.invoke(nmsData), gameMode, listName));
 		}
 		return new PacketPlayOutPlayerInfo(action, listData);
 	}
 
 	@Override
-	public PacketPlayOutScoreboardObjective readObjective(Object nmsPacket, ProtocolVersion clientVersion) throws Exception {
-		String objective = (String) nms.PacketPlayOutScoreboardObjective_OBJECTIVENAME.get(nmsPacket);
-		String displayName;
-		if (nms.minorVersion >= 13) {
-			Object component = nms.PacketPlayOutScoreboardObjective_DISPLAYNAME.get(nmsPacket);
-			IChatBaseComponent c = component == null ? null : fromNMSComponent(component);
-			displayName = c == null ? null : c.toLegacyText();
-		} else {
-			displayName = (String) nms.PacketPlayOutScoreboardObjective_DISPLAYNAME.get(nmsPacket);
-		}
-		EnumScoreboardHealthDisplay renderType = null;
-		if (nms.PacketPlayOutScoreboardObjective_RENDERTYPE != null) {
-			Object nmsRender = nms.PacketPlayOutScoreboardObjective_RENDERTYPE.get(nmsPacket);
-			if (nmsRender != null) {
-				if (nms.minorVersion >= 8) {
-					renderType = EnumScoreboardHealthDisplay.valueOf(nmsRender.toString());
-				} else {
-					renderType = EnumScoreboardHealthDisplay.values()[(int)nmsRender];
-				}
-			}
-		}
-		int method = nms.PacketPlayOutScoreboardObjective_METHOD.getInt(nmsPacket);
-		return new PacketPlayOutScoreboardObjective(method, objective, displayName, renderType);
+	public PacketPlayOutScoreboardObjective readObjective(Object nmsPacket) throws ReflectiveOperationException {
+		return new PacketPlayOutScoreboardObjective(nms.PacketPlayOutScoreboardObjective_METHOD.getInt(nmsPacket),
+				(String) nms.PacketPlayOutScoreboardObjective_OBJECTIVENAME.get(nmsPacket), null, null
+		);
 	}
 
 	@Override
-	public PacketPlayOutScoreboardDisplayObjective readDisplayObjective(Object nmsPacket, ProtocolVersion clientVersion) throws Exception {
+	public PacketPlayOutScoreboardDisplayObjective readDisplayObjective(Object nmsPacket) throws ReflectiveOperationException {
 		return new PacketPlayOutScoreboardDisplayObjective(
 			nms.PacketPlayOutScoreboardDisplayObjective_POSITION.getInt(nmsPacket),
 			(String) nms.PacketPlayOutScoreboardDisplayObjective_OBJECTIVENAME.get(nmsPacket)
 		);
 	}
-	
+
 	/**
-	 * A method yoinked from minecraft code used to convert double to int
+	 * Builds entity BossBar packet
+	 * @param packet - packet to build
+	 * @param clientVersion - client version
+	 * @return entity BossBar packet
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
+	 */
+	private Object buildBossPacketEntity(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		if (packet.getOperation() == Action.UPDATE_STYLE) return null; //nothing to do here
+
+		int entityId = packet.getId().hashCode();
+		if (packet.getOperation() == Action.REMOVE) {
+			return build(new PacketPlayOutEntityDestroy(entityId));
+		}
+		DataWatcher w = new DataWatcher();
+		if (packet.getOperation() == Action.UPDATE_PCT || packet.getOperation() == Action.ADD) {
+			float health = 300*packet.getPct();
+			if (health == 0) health = 1;
+			w.helper().setHealth(health);
+		}
+		if (packet.getOperation() == Action.UPDATE_NAME || packet.getOperation() == Action.ADD) {
+			w.helper().setCustomName(packet.getName(), clientVersion);
+		}
+		if (packet.getOperation() == Action.ADD) {
+			w.helper().setEntityFlags((byte) 32);
+			return build(new PacketPlayOutSpawnEntityLiving(entityId, null, EntityType.WITHER, new Location(null, 0,0,0), w));
+		} else {
+			return build(new PacketPlayOutEntityMetadata(entityId, w));
+		}
+	}
+
+	/**
+	 * A method taken from minecraft code used to convert double to int
 	 * @param paramDouble double value
 	 * @return int value
 	 */
@@ -447,131 +402,157 @@ public class BukkitPacketBuilder implements PacketBuilder {
 		int i = (int)paramDouble;
 		return paramDouble < i ? i - 1 : i;
 	}
-	
+
 	/**
-	 * Converts json string into a component
-	 * @param json json as string
-	 * @return NMS component
-	 * @throws Exception if something fails
-	 */
-	public Object stringToComponent(String json) throws Exception {
-		if (json == null) return null;
-		return nms.ChatSerializer_DESERIALIZE.invoke(null, json);
-	}
-	
-	/**
-	 * Converts minecraft IChatBaseComponent into TAB's component class. Currently does not support hover event.
+	 * Converts minecraft IChatBaseComponent into TAB's component class. Currently, does not support show_item hover event on 1.16+.
 	 * @param component - component to convert
 	 * @return converted component
-	 * @throws Exception if something fails
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
 	 */
-	public IChatBaseComponent fromNMSComponent(Object component) throws Exception {
-		long time = System.nanoTime();
-		IChatBaseComponent obj = fromNMSComponent0(component);
-		TAB.getInstance().getCPUManager().addMethodTime("fromNMSComponent", System.nanoTime()-time);
-		return obj;
-	}
-	
-	//separate method to prevent extras counting cpu again due to recursion and finally showing higher usage than real
-	@SuppressWarnings("rawtypes")
-	public IChatBaseComponent fromNMSComponent0(Object component) throws Exception {
+	private IChatBaseComponent fromNMSComponent(Object component) throws ReflectiveOperationException {
 		if (!nms.ChatComponentText.isInstance(component)) return null; //paper
 		IChatBaseComponent chat = new IChatBaseComponent((String) nms.ChatComponentText_text.get(component));
 		Object modifier = nms.ChatBaseComponent_modifier.get(component);
 		if (modifier != null) {
-			Object color = nms.ChatModifier_color.get(modifier);
-			if (color != null) {
-				if (nms.minorVersion >= 16) {
-					String name = (String) nms.ChatHexColor_name.get(color);
-					if (name != null) {
-						//legacy code
-						chat.setColor(new TextColor(EnumChatFormat.valueOf(name.toUpperCase())));
-					} else {
-						int rgb = (int) nms.ChatHexColor_rgb.get(color);
-						chat.setColor(new TextColor((rgb >> 16) & 0xFF, (rgb >> 8) & 0xFF, rgb & 0xFF));
-					}
-				} else {
-					chat.setColor(new TextColor(EnumChatFormat.valueOf(((Enum)color).name())));
-				}
-			}
-			chat.setBold((Boolean) nms.ChatModifier_bold.get(modifier));
-			chat.setItalic((Boolean) nms.ChatModifier_italic.get(modifier));
-			chat.setObfuscated((Boolean) nms.ChatModifier_obfuscated.get(modifier));
-			chat.setStrikethrough((Boolean) nms.ChatModifier_strikethrough.get(modifier));
-			chat.setUnderlined((Boolean) nms.ChatModifier_underlined.get(modifier));
+			chat.getModifier().setColor(fromNMSColor(nms.ChatModifier_color.get(modifier)));
+			chat.getModifier().setBold((Boolean) nms.ChatModifier_bold.get(modifier));
+			chat.getModifier().setItalic((Boolean) nms.ChatModifier_italic.get(modifier));
+			chat.getModifier().setObfuscated((Boolean) nms.ChatModifier_obfuscated.get(modifier));
+			chat.getModifier().setStrikethrough((Boolean) nms.ChatModifier_strikethrough.get(modifier));
+			chat.getModifier().setUnderlined((Boolean) nms.ChatModifier_underlined.get(modifier));
 			Object clickEvent = nms.ChatModifier_clickEvent.get(modifier);
 			if (clickEvent != null) {
-				chat.onClick(ClickAction.valueOf(nms.ChatClickable_action.get(clickEvent).toString().toUpperCase()), (String) nms.ChatClickable_value.get(clickEvent));
+				chat.getModifier().onClick(EnumClickAction.valueOf(nms.ChatClickable_action.get(clickEvent).toString().toUpperCase()), (String) nms.ChatClickable_value.get(clickEvent));
 			}
-	/*		Object hoverEvent = nms.ChatModifier_hoverEvent.get(modifier);
+			Object hoverEvent = nms.ChatModifier_hoverEvent.get(modifier);
 			if (hoverEvent != null) {
-				chat.onHover(HoverAction.fromString(nms.ChatHoverable_action.get(hoverEvent).toString()), fromNMSComponent(nms.ChatHoverable_value.get(hoverEvent)));
-			}*/
+				EnumHoverAction action;
+				IChatBaseComponent value;
+				if (nms.getMinorVersion() >= 16) {
+					//does not support show_item on 1.16+
+					JsonObject json = (JsonObject) nms.ChatHoverable_serialize.invoke(hoverEvent);
+					action = EnumHoverAction.valueOf(json.get("action").getAsString().toUpperCase());
+					value = IChatBaseComponent.deserialize(json.get("contents").getAsJsonObject().toString());
+				} else {
+					action = EnumHoverAction.valueOf(nms.ChatHoverable_getAction.invoke(hoverEvent).toString().toUpperCase());
+					value = fromNMSComponent(nms.ChatHoverable_getValue.invoke(hoverEvent));
+				}
+				chat.getModifier().onHover(action, value);
+			}
 		}
 		for (Object extra : (List<Object>) nms.ChatBaseComponent_extra.get(component)) {
-			chat.addExtra(fromNMSComponent0(extra));
+			chat.addExtra(fromNMSComponent(extra));
 		}
 		return chat;
 	}
-	
+
+	private TextColor fromNMSColor(Object color) throws ReflectiveOperationException {
+		if (color == null) return null;
+		if (nms.getMinorVersion() >= 16) {
+			String name = (String) nms.ChatHexColor_name.get(color);
+			if (name != null) {
+				//legacy code
+				return new TextColor(EnumChatFormat.valueOf(name.toUpperCase(Locale.US)));
+			} else {
+				int rgb = (int) nms.ChatHexColor_rgb.get(color);
+				return new TextColor((rgb >> 16) & 0xFF, (rgb >> 8) & 0xFF, rgb & 0xFF);
+			}
+		} else {
+			return new TextColor(EnumChatFormat.valueOf(((Enum)color).name()));
+		}
+	}
+
 	/**
-	 * Converts TAB's IChatBaseComponent into minecraft's component. Currently does not support hover event.
+	 * Converts TAB's IChatBaseComponent into minecraft's component. Currently, does not support hover event.
 	 * @param component - component to convert
 	 * @param clientVersion - client version used to decide RGB conversion
 	 * @return converted component
-	 * @throws Exception if something fails
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
 	 */
-	public Object toNMSComponent(IChatBaseComponent component, ProtocolVersion clientVersion) throws Exception {
-		long time = System.nanoTime();
-		Object obj = toNMSComponent0(component, clientVersion);
-		TAB.getInstance().getCPUManager().addMethodTime("toNMSComponent", System.nanoTime()-time);
+	public Object toNMSComponent(IChatBaseComponent component, ProtocolVersion clientVersion) throws ReflectiveOperationException {
+		Object obj;
+		if (clientVersion.getMinorVersion() >= 16) {
+			if (componentCacheModern.containsKey(component)) return componentCacheModern.get(component);
+			obj = toNMSComponent0(component, clientVersion);
+			if (componentCacheModern.size() > 10000) componentCacheModern.clear();
+			componentCacheModern.put(component, obj);
+		} else {
+			if (componentCacheLegacy.containsKey(component)) return componentCacheLegacy.get(component);
+			obj = toNMSComponent0(component, clientVersion);
+			if (componentCacheLegacy.size() > 10000) componentCacheLegacy.clear();
+			componentCacheLegacy.put(component, obj);
+		}
 		return obj;
 	}
-	
+
 	//separate method to prevent extras counting cpu again due to recursion and finally showing higher usage than real
-	private Object toNMSComponent0(IChatBaseComponent component, ProtocolVersion clientVersion) throws Exception {
+	private Object toNMSComponent0(IChatBaseComponent component, ProtocolVersion clientVersion) throws ReflectiveOperationException {
 		if (component == null) return null;
 		Object chat = nms.newChatComponentText.newInstance(component.getText());
 		Object modifier;
-		if (nms.minorVersion >= 16) {
+		Object clickEvent = component.getModifier().getClickEvent() == null ? null : nms.newChatClickable.newInstance(Enum.valueOf((Class<Enum>) nms.EnumClickAction, 
+				component.getModifier().getClickEvent().getAction().toString().toUpperCase()), component.getModifier().getClickEvent().getValue());
+		if (nms.getMinorVersion() >= 16) {
 			Object color = null;
-			if (component.getColor() != null) {
+			if (component.getModifier().getColor() != null) {
 				if (clientVersion.getMinorVersion() >= 16) {
-					color = nms.ChatHexColor_ofInt.invoke(null, (component.getColor().getRed() << 16) + (component.getColor().getGreen() << 8) + component.getColor().getBlue());
+					color = nms.ChatHexColor_ofInt.invoke(null, (component.getModifier().getColor().getRed() << 16) + (component.getModifier().getColor().getGreen() << 8) + component.getModifier().getColor().getBlue());
 				} else {
-					color = nms.ChatHexColor_ofString.invoke(null, component.getColor().getLegacyColor().toString().toLowerCase());
+					color = nms.ChatHexColor_ofString.invoke(null, component.getModifier().getColor().getLegacyColor().toString().toLowerCase());
+				}
+			}
+			Object hoverEvent = null;
+			if (component.getModifier().getHoverEvent() != null) {
+				Object nmsAction = nms.EnumHoverAction_a.invoke(null, component.getModifier().getHoverEvent().getAction().toString().toLowerCase());
+				switch (component.getModifier().getHoverEvent().getAction()) {
+				case SHOW_TEXT:
+					hoverEvent = nms.newChatHoverable.newInstance(nmsAction, toNMSComponent0(component.getModifier().getHoverEvent().getValue(), clientVersion));
+					break;
+				case SHOW_ENTITY:
+					hoverEvent = nms.EnumHoverAction_fromJson.invoke(nmsAction, ((ChatComponentEntity) component.getModifier().getHoverEvent().getValue()).toJson());
+					break;
+				case SHOW_ITEM:
+					hoverEvent = nms.EnumHoverAction_fromLegacyComponent.invoke(nmsAction, toNMSComponent0(component.getModifier().getHoverEvent().getValue(), clientVersion));
+					break;
+				default:
+					break;
 				}
 			}
 			modifier = nms.newChatModifier.newInstance(
 					color,
-					component.isBold() ? true : null,
-					component.isItalic() ? true : null,
-					component.isUnderlined() ? true : null,
-					component.isStrikethrough() ? true : null,
-					component.isObfuscated() ? true : null,
-					component.getClickAction() == null ? null : nms.newChatClickable.newInstance(nms.EnumClickAction_a.invoke(null, component.getClickAction().toString().toLowerCase()), component.getClickValue().toString()), 
-					null, //component.getHoverAction() == null ? null : nms.newChatHoverable.newInstance(nms.EnumHoverAction_a.invoke(null, component.getHoverAction().toString().toLowerCase()), stringToComponent(component.getHoverValue().toString())), 
-					null, null
-			);
+					component.getModifier().getBold(),
+					component.getModifier().getItalic(),
+					component.getModifier().getUnderlined(),
+					component.getModifier().getStrikethrough(),
+					component.getModifier().getObfuscated(),
+					clickEvent, hoverEvent, null, null);
 		} else {
 			modifier = nms.newChatModifier.newInstance();
-			if (component.getClickAction() != null){
-				nms.ChatModifier_clickEvent.set(modifier, nms.newChatClickable.newInstance(nms.EnumClickAction_a.invoke(null, component.getClickAction().toString().toLowerCase()), component.getClickValue().toString()));
+			if (component.getModifier().getColor() != null) nms.setField(modifier, nms.ChatModifier_color, Enum.valueOf((Class<Enum>) nms.EnumChatFormat, component.getModifier().getColor().getLegacyColor().toString()));
+			nms.setField(modifier, nms.ChatModifier_bold, component.getModifier().getBold());
+			nms.setField(modifier, nms.ChatModifier_italic, component.getModifier().getItalic());
+			nms.setField(modifier, nms.ChatModifier_underlined, component.getModifier().getUnderlined());
+			nms.setField(modifier, nms.ChatModifier_strikethrough, component.getModifier().getStrikethrough());
+			nms.setField(modifier, nms.ChatModifier_obfuscated, component.getModifier().getObfuscated());
+			if (clickEvent != null) nms.setField(modifier, nms.ChatModifier_clickEvent, clickEvent);
+			if (component.getModifier().getHoverEvent() != null) {
+				nms.setField(modifier, nms.ChatModifier_hoverEvent, nms.newChatHoverable.newInstance(nms.EnumHoverAction_a.invoke(null, 
+						component.getModifier().getHoverEvent().getAction().toString().toLowerCase()), toNMSComponent0(component.getModifier().getHoverEvent().getValue(), clientVersion)));
 			}
-/*			if (component.getHoverAction() != null) {
-				nms.ChatModifier_hoverEvent.set(modifier, nms.newChatHoverable.newInstance(nms.EnumHoverAction_a.invoke(null, (component.getHoverAction().toString().toLowerCase())), stringToComponent(component.getHoverValue().toString())));
-			}*/
-			if (component.getColor() != null) nms.ChatModifier_color.set(modifier, Enum.valueOf(nms.EnumChatFormat, component.getColor().getLegacyColor().toString()));
-			if (component.isBold()) nms.ChatModifier_bold.set(modifier, true);
-			if (component.isItalic()) nms.ChatModifier_italic.set(modifier, true);
-			if (component.isUnderlined()) nms.ChatModifier_underlined.set(modifier, true);
-			if (component.isStrikethrough()) nms.ChatModifier_strikethrough.set(modifier, true);
-			if (component.isObfuscated()) nms.ChatModifier_obfuscated.set(modifier, true);
 		}
-		nms.ChatBaseComponent_modifier.set(chat, modifier);
+		nms.setField(chat, nms.ChatBaseComponent_modifier, modifier);
 		for (IChatBaseComponent extra : component.getExtra()) {
 			nms.ChatComponentText_addSibling.invoke(chat, toNMSComponent0(extra, clientVersion));
 		}
 		return chat;
 	}
+
+	private Object newScoreboardObjective(String objectiveName) throws ReflectiveOperationException {
+		if (nms.getMinorVersion() >= 13) {
+			return nms.newScoreboardObjective.newInstance(null, objectiveName, null, nms.newChatComponentText.newInstance(""), null);
+		}
+		return nms.newScoreboardObjective.newInstance(null, objectiveName, nms.IScoreboardCriteria_self.get(null));
+	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPipelineInjector.java

@@ -2,96 +2,38 @@ package me.neznamy.tab.platforms.bukkit;
 
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.NoSuchElementException;
 
 import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
+import me.neznamy.tab.api.TabFeature;
 import me.neznamy.tab.api.TabPlayer;
 import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
+import me.neznamy.tab.shared.TabConstants;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.cpu.UsageType;
+import me.neznamy.tab.shared.features.NickCompatibility;
 import me.neznamy.tab.shared.features.PipelineInjector;
 
 public class BukkitPipelineInjector extends PipelineInjector {
 
-	//handler to inject before
-	private final String INJECT_POSITION = "packet_handler";
-	
 	//nms storage
-	private NMSStorage nms;
+	private final NMSStorage nms = NMSStorage.getInstance();
 
 	/**
-	 * Constructs new instance with given parameters
-	 * @param tab - tab instance
-	 * @param nms - nms storage
+	 * Constructs new instance
 	 */
-	public BukkitPipelineInjector(TAB tab, NMSStorage nms){
-		super(tab);
-		this.nms = nms;
-	}
-	
-	@Override
-	public void inject(TabPlayer player) {
-		if (!player.getChannel().pipeline().names().contains(INJECT_POSITION)) {
-			//fake player or waterfall bug
-			return;
-		}
-		uninject(player);
-		try {
-			player.getChannel().pipeline().addBefore(INJECT_POSITION, DECODER_NAME, new BukkitChannelDuplexHandler(player));
-		} catch (NoSuchElementException | IllegalArgumentException e) {
-			//idk how does this keep happening but whatever
-		}
+	public BukkitPipelineInjector(){
+		super("packet_handler");
+		channelFunction = BukkitChannelDuplexHandler::new;
 	}
 
-	@Override
-	public void uninject(TabPlayer player) {
-		try {
-			if (player.getChannel().pipeline().names().contains(DECODER_NAME)) player.getChannel().pipeline().remove(DECODER_NAME);
-		} catch (NoSuchElementException e) {
-			//for whatever reason this rarely throws
-			//java.util.NoSuchElementException: TABReader
-		}
-	}
-
-	/**
-	 * Removes all real players from team if packet does not come from TAB and reports this to override log
-	 * @param packetPlayOutScoreboardTeam - team packet
-	 * @throws Exception - if reflection fails
-	 */
-	@SuppressWarnings("unchecked")
-	private void modifyPlayers(Object packetPlayOutScoreboardTeam) throws Exception {
-		long time = System.nanoTime();
-		if (nms.PacketPlayOutScoreboardTeam_SIGNATURE.getInt(packetPlayOutScoreboardTeam) != 69) {
-			Collection<String> players = (Collection<String>) nms.PacketPlayOutScoreboardTeam_PLAYERS.get(packetPlayOutScoreboardTeam);
-			//creating a new list to prevent NoSuchFieldException in minecraft packet encoder when a player is removed
-			Collection<String> newList = new ArrayList<String>();
-			for (String entry : players) {
-				TabPlayer p = tab.getPlayer(entry);
-				if (p == null) {
-					newList.add(entry);
-					continue;
-				}
-				if (tab.getFeatureManager().getNameTagFeature().isDisabledWorld(p.getWorldName())) {
-					newList.add(entry);
-				} else {
-					logTeamOverride((String) nms.PacketPlayOutScoreboardTeam_NAME.get(packetPlayOutScoreboardTeam), entry);
-				}
-			}
-			nms.PacketPlayOutScoreboardTeam_PLAYERS.set(packetPlayOutScoreboardTeam, newList);
-		}
-		tab.getCPUManager().addTime(TabFeature.NAMETAGS, UsageType.ANTI_OVERRIDE, System.nanoTime()-time);
-	}
-	
 	/**
 	 * Custom channel duplex handler override
 	 */
 	public class BukkitChannelDuplexHandler extends ChannelDuplexHandler {
 		
 		//injected player
-		private TabPlayer player;
+		private final TabPlayer player;
 		
 		/**
 		 * Constructs new instance with given player
@@ -102,38 +44,85 @@ public class BukkitPipelineInjector extends PipelineInjector {
 		}
 
 		@Override
-		public void channelRead(ChannelHandlerContext context, Object packet) throws Exception {
+		public void channelRead(ChannelHandlerContext context, Object packet) {
 			try {
-				Object modifiedPacket = tab.getFeatureManager().onPacketReceive(player, packet);
-				if (modifiedPacket != null) super.channelRead(context, modifiedPacket);
-			} catch (Throwable e){
-				tab.getErrorManager().printError("An error occurred when reading packets", e);
+				if (TAB.getInstance().getFeatureManager().onPacketReceive(player, packet)) return;
+				super.channelRead(context, packet);
+			} catch (Exception e){
+				TAB.getInstance().getErrorManager().printError("An error occurred when reading packets", e);
 			}
 		}
 
 		@Override
-		public void write(ChannelHandlerContext context, Object packet, ChannelPromise channelPromise) throws Exception {
+		public void write(ChannelHandlerContext context, Object packet, ChannelPromise channelPromise) {
 			try {
 				if (nms.PacketPlayOutPlayerInfo.isInstance(packet)) {
-					super.write(context, tab.getFeatureManager().onPacketPlayOutPlayerInfo(player, packet), channelPromise);
+					super.write(context, TAB.getInstance().getFeatureManager().onPacketPlayOutPlayerInfo(player, packet), channelPromise);
 					return;
 				}
-				if (tab.getFeatureManager().getNameTagFeature() != null && antiOverrideTeams && nms.PacketPlayOutScoreboardTeam.isInstance(packet)) {
+				if (antiOverrideTeams && nms.PacketPlayOutScoreboardTeam != null && nms.PacketPlayOutScoreboardTeam.isInstance(packet)) {
 					modifyPlayers(packet);
 					super.write(context, packet, channelPromise);
 					return;
 				}
-				if (nms.PacketPlayOutScoreboardDisplayObjective.isInstance(packet) && antiOverrideObjectives && tab.getFeatureManager().onDisplayObjective(player, packet)) {
-					return;
+				if (nms.PacketPlayOutScoreboardDisplayObjective.isInstance(packet)){
+					TAB.getInstance().getFeatureManager().onDisplayObjective(player, packet);
 				}
-				if (antiOverrideObjectives && nms.PacketPlayOutScoreboardObjective.isInstance(packet)) {
-					tab.getFeatureManager().onObjective(player, packet);
+				if (nms.PacketPlayOutScoreboardObjective.isInstance(packet)) {
+					TAB.getInstance().getFeatureManager().onObjective(player, packet);
 				}
-				tab.getFeatureManager().onPacketSend(player, packet);
-			} catch (Throwable e){
-				tab.getErrorManager().printError("An error occurred when reading packets", e);
+				TAB.getInstance().getFeatureManager().onPacketSend(player, packet);
+			} catch (Exception e){
+				TAB.getInstance().getErrorManager().printError("An error occurred when reading packets", e);
 			}
-			super.write(context, packet, channelPromise);
+			try {
+				super.write(context, packet, channelPromise);
+			} catch (Exception e) {
+				TAB.getInstance().getErrorManager().printError("Failed to forward packet " + packet.getClass().getSimpleName() + " to " + player.getName(), e);
+			}
+		}
+		
+		/**
+		 * Removes all real players from team if packet does not come from TAB and reports this to override log
+		 * @param packetPlayOutScoreboardTeam - team packet
+		 * @throws	ReflectiveOperationException
+		 * 			nmsGameMode
+		 */
+		@SuppressWarnings("unchecked")
+		private void modifyPlayers(Object packetPlayOutScoreboardTeam) throws ReflectiveOperationException {
+			long time = System.nanoTime();
+			Collection<String> players = (Collection<String>) nms.PacketPlayOutScoreboardTeam_PLAYERS.get(packetPlayOutScoreboardTeam);
+			String teamName = (String) nms.PacketPlayOutScoreboardTeam_NAME.get(packetPlayOutScoreboardTeam);
+			if (players == null) return;
+			//creating a new list to prevent NoSuchFieldException in minecraft packet encoder when a player is removed
+			Collection<String> newList = new ArrayList<>();
+			for (String entry : players) {
+				TabPlayer p = getPlayer(entry);
+				if (p == null) {
+					newList.add(entry);
+					continue;
+				}
+				if (!((TabFeature)TAB.getInstance().getTeamManager()).isDisabledPlayer(p) && 
+						!TAB.getInstance().getTeamManager().hasTeamHandlingPaused(p) && !teamName.equals(p.getTeamName())) {
+					logTeamOverride(teamName, p.getName(), p.getTeamName());
+				} else {
+					newList.add(entry);
+				}
+			}
+			nms.setField(packetPlayOutScoreboardTeam, nms.PacketPlayOutScoreboardTeam_PLAYERS, newList);
+			TAB.getInstance().getCPUManager().addTime("NameTags", TabConstants.CpuUsageCategory.ANTI_OVERRIDE, System.nanoTime()-time);
+		}
+		
+		private TabPlayer getPlayer(String name) {
+			for (TabPlayer p : TAB.getInstance().getOnlinePlayers()) {
+				if (getName(p).equals(name)) return p;
+			}
+			return null;
+		}
+
+		
+		private String getName(TabPlayer p) {
+			return ((NickCompatibility) TAB.getInstance().getFeatureManager().getFeature("nick")).getNickname(p);
 		}
 	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPlaceholderRegistry.java

@@ -1,30 +1,32 @@
 package me.neznamy.tab.platforms.bukkit;
 
 import java.lang.reflect.Field;
-import java.lang.reflect.Method;
+import java.math.RoundingMode;
 import java.text.DecimalFormat;
 import java.text.NumberFormat;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
 import java.util.Locale;
-import java.util.UUID;
 
 import org.bukkit.Bukkit;
-import org.bukkit.Statistic;
 import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
+import org.bukkit.event.player.PlayerRespawnEvent;
+import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.RegisteredServiceProvider;
-import org.bukkit.plugin.java.JavaPlugin;
+
+import com.earth2me.essentials.Essentials;
 
 import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.api.placeholder.PlaceholderManager;
+import me.neznamy.tab.api.placeholder.PlayerPlaceholder;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.features.PlaceholderManager;
-import me.neznamy.tab.shared.placeholders.Placeholder;
+import me.neznamy.tab.shared.TabConstants;
 import me.neznamy.tab.shared.placeholders.PlaceholderRegistry;
-import me.neznamy.tab.shared.placeholders.PlayerPlaceholder;
-import me.neznamy.tab.shared.placeholders.ServerPlaceholder;
 import net.milkbowl.vault.chat.Chat;
-import net.milkbowl.vault.economy.Economy;
 
 /**
  * Bukkit registry to register bukkit-only placeholders
@@ -34,283 +36,166 @@ public class BukkitPlaceholderRegistry implements PlaceholderRegistry {
 	//formatter for 2 decimal places
 	public final DecimalFormat decimal2 = ((DecimalFormat)NumberFormat.getNumberInstance(Locale.US));
 
-	//plugin instance
-	private JavaPlugin plugin;
+	private final Plugin plugin;
 
-	//vault economy
-	private Economy economy;
+	private Object chat;
+	private final Plugin essentials = Bukkit.getPluginManager().getPlugin("Essentials");
+	private Object server;
+	private Field recentTps;
+	private boolean paperTps;
+	private boolean paperMspt;
+	private boolean purpur;
 
-	//vault chat
-	private Chat chat;
-
-	//placeholder registry buffer
-	private List<Placeholder> placeholders;
-
-	//essentials methods
-	private Method getUser;
-	private Method getNickname;
+	private Listener healthListener = null;
 
 	/**
 	 * Constructs new instance with given parameter
 	 * @param plugin - plugin instance
 	 */
-	public BukkitPlaceholderRegistry(JavaPlugin plugin) {
-		decimal2.applyPattern("#.##");
+	public BukkitPlaceholderRegistry(Plugin plugin) {
 		this.plugin = plugin;
-		if (Bukkit.getPluginManager().isPluginEnabled("Vault")) {
-			RegisteredServiceProvider<Economy> rspEconomy = Bukkit.getServicesManager().getRegistration(Economy.class);
-			if (rspEconomy != null) economy = rspEconomy.getProvider();
-			RegisteredServiceProvider<Chat> rspChat = Bukkit.getServicesManager().getRegistration(Chat.class);
-			if (rspChat != null) chat = rspChat.getProvider();
-		}
-		if (Bukkit.getPluginManager().isPluginEnabled("Essentials")) {
-			try {
-				getUser = Class.forName("com.earth2me.essentials.Essentials").getMethod("getUser", Player.class);
-				getNickname = Class.forName("com.earth2me.essentials.User").getMethod("getNickname");
-			} catch (Exception e) {
-				TAB.getInstance().getErrorManager().printError("Failed to load essentials methods", e);
+		decimal2.applyPattern("#.##");
+		try {
+			if (Bukkit.getPluginManager().isPluginEnabled("Vault")) {
+				RegisteredServiceProvider<?> rspChat = Bukkit.getServicesManager().getRegistration(Class.forName("net.milkbowl.vault.chat.Chat"));
+				if (rspChat != null) chat = rspChat.getProvider();
 			}
+		} catch (ClassNotFoundException e) {
+			//modded server without vault
+		}
+		try {
+			server = Bukkit.getServer().getClass().getMethod("getServer").invoke(Bukkit.getServer());
+			recentTps = server.getClass().getField("recentTps");
+		} catch (ReflectiveOperationException e) {
+			//not spigot
+		}
+		try {
+			Bukkit.class.getMethod("getTPS");
+			paperTps = true;
+		} catch (NoSuchMethodException e) {
+			//not paper
+		}
+		try {
+			Bukkit.class.getMethod("getAverageTickTime");
+			paperMspt = true;
+		} catch (NoSuchMethodException e) {
+			//not paper
+		}
+		try {
+			Player.class.getMethod("isAfk");
+			purpur = true;
+		} catch (NoSuchMethodException e) {
+			//not purpur
 		}
 	}
 
+	@SuppressWarnings("deprecation")
 	@Override
-	public List<Placeholder> registerPlaceholders() {
-		placeholders = new ArrayList<Placeholder>();
-		placeholders.add(new PlayerPlaceholder("%money%", 1000) {
-			public String get(TabPlayer p) {
-				if (economy != null) return decimal2.format(economy.getBalance((Player) p.getPlayer()));
-				return "-";
-			}
-		});
-
-		placeholders.add(new PlayerPlaceholder("%displayname%", 500) {
-			public String get(TabPlayer p) {
-				return ((Player) p.getPlayer()).getDisplayName();
-			}
-		});
-		placeholders.add(new PlayerPlaceholder("%deaths%", 1000) {
-			public String get(TabPlayer p) {
-				return String.valueOf(((Player) p.getPlayer()).getStatistic(Statistic.DEATHS));
-			}
-		});
-		placeholders.add(new PlayerPlaceholder("%health%", 100) {
-			public String get(TabPlayer p) {
-				return String.valueOf((int) Math.ceil(((Player) p.getPlayer()).getHealth()));
-			}
-		});
-		placeholders.add(new ServerPlaceholder("%tps%", 1000) {
-			public String get() {
+	public void registerPlaceholders(PlaceholderManager manager) {
+		NumberFormat roundDown = NumberFormat.getInstance();
+		roundDown.setRoundingMode(RoundingMode.DOWN);
+		roundDown.setMaximumFractionDigits(2);
+		manager.registerPlayerPlaceholder("%displayname%", 500, p -> ((Player) p.getPlayer()).getDisplayName());
+		manager.registerPlayerPlaceholder("%vanished%", 1000, TabPlayer::isVanished);
+		if (paperTps) {
+			manager.registerServerPlaceholder("%tps%", 1000, () -> formatTPS(Bukkit.getTPS()[0]));
+		} else if (recentTps != null) {
+			manager.registerServerPlaceholder("%tps%", 1000, () -> {
 				try {
-					Object nmsServer = Bukkit.getServer().getClass().getMethod("getServer").invoke(Bukkit.getServer());
-					double value = ((double[]) nmsServer.getClass().getField("recentTps").get(nmsServer))[0];
-					return decimal2.format(Math.min(20, value));
-				} catch (Throwable t) {
+					return formatTPS(((double[]) recentTps.get(server))[0]);
+				} catch (IllegalAccessException e) {
 					return "-1";
 				}
-			}
-		});
-		placeholders.add(new PlayerPlaceholder("%canseeonline%", 2000) {
-			public String get(TabPlayer p) {
-				int var = 0;
-				for (TabPlayer all : TAB.getInstance().getPlayers()){
-					if (((Player) p.getPlayer()).canSee((Player) all.getPlayer())) var++;
-				}
-				return String.valueOf(var);
-			}
-		});
-		placeholders.add(new PlayerPlaceholder("%canseestaffonline%", 2000) {
-			public String get(TabPlayer p) {
-				int var = 0;
-				for (TabPlayer all : TAB.getInstance().getPlayers()){
-					if (all.isStaff() && ((Player) p.getPlayer()).canSee((Player) all.getPlayer())) var++;
-				}
-				return String.valueOf(var);
-			}
-		});
-		registerAFKPlaceholder();
-		registerVaultPlaceholders();
-		registerPositionPlaceholders();
-		registerEssentialsPlaceholders();
-		registerSyncPlaceholders();
-		return placeholders;
-	}
-
-	/**
-	 * Registers AFK placeholder
-	 */
-	private void registerAFKPlaceholder() {
-		String noAfk = TAB.getInstance().getConfiguration().config.getString("placeholders.afk-no", "");
-		String yesAfk = TAB.getInstance().getConfiguration().config.getString("placeholders.afk-yes", " &4*&4&lAFK&4*&r");
-		placeholders.add(new PlayerPlaceholder("%afk%", 500) {
-			public String get(TabPlayer p) {
-				boolean afk = false;
-				try {
-					if (Bukkit.getPluginManager().isPluginEnabled("Essentials")) {
-						Object user = Bukkit.getPluginManager().getPlugin("Essentials").getClass().getMethod("getUser", Player.class).invoke(Bukkit.getPluginManager().getPlugin("Essentials"), p.getPlayer());
-						afk = (boolean) user.getClass().getMethod("isAfk").invoke(user);
-					}
-					if (Bukkit.getPluginManager().isPluginEnabled("AFKPlus")) {
-						Object AFKPlus = Bukkit.getPluginManager().getPlugin("AFKPlus");
-						Object AFKPlusPlayer = AFKPlus.getClass().getMethod("getPlayer", UUID.class).invoke(AFKPlus, p.getUniqueId());
-						afk = (boolean) AFKPlusPlayer.getClass().getMethod("isAFK").invoke(AFKPlusPlayer);
-					}
-					if (Bukkit.getPluginManager().isPluginEnabled("AntiAFKPlus")) {
-						Object api = Class.forName("de.kinglol12345.AntiAFKPlus.api.AntiAFKPlusAPI").getDeclaredMethod("getAPI").invoke(null);
-						afk = (boolean) api.getClass().getMethod("isAFK", Player.class).invoke(api, p.getPlayer());
-					}
-					if (Bukkit.getPluginManager().isPluginEnabled("xAntiAFK")) {
-						afk = (boolean) Class.forName("ch.soolz.xantiafk.xAntiAFKAPI").getMethod("isAfk", Player.class).invoke(null, p.getPlayer());
-					}
-					if (Bukkit.getPluginManager().isPluginEnabled("AutoAFK")) {
-						Object plugin = Bukkit.getPluginManager().getPlugin("AutoAFK");
-						Field f = plugin.getClass().getDeclaredField("afkList");
-						f.setAccessible(true);
-						HashMap<?, ?> map = (HashMap<?, ?>) f.get(plugin);
-						afk = map.containsKey(p.getPlayer());
-					}
-				} catch (Throwable t) {
-					return TAB.getInstance().getErrorManager().printError("", "Failed to check AFK status of " + p.getName(), t);
-				}
-				if (!afk) {
-					try {
-						//purpur AFK API
-						afk = (boolean) p.getPlayer().getClass().getMethod("isAfk").invoke(p.getPlayer());
-					} catch (Throwable t) {
-						//not purpur
-					}
-				}
-				return afk ? yesAfk : noAfk;
-			}
-			@Override
-			public String[] getNestedStrings(){
-				return new String[] {yesAfk, noAfk};
-			}
-		});
-	}
-
-	/**
-	 * Registers vault placeholders
-	 */
-	private void registerVaultPlaceholders() {
-		if (Bukkit.getPluginManager().isPluginEnabled("Vault") && chat != null) {
-			placeholders.add(new PlayerPlaceholder("%vault-prefix%", 500) {
-
-				public String get(TabPlayer p) {
-					try {
-						String prefix = chat.getPlayerPrefix((Player) p.getPlayer());
-						return prefix != null ? prefix : "";
-					} catch (Exception e) {
-						return TAB.getInstance().getErrorManager().printError("", "Placeholder %vault-prefix% threw an exception", e);
-					}
-				}
-			});
-			placeholders.add(new PlayerPlaceholder("%vault-suffix%", 500) {
-
-				public String get(TabPlayer p) {
-					try {
-						String suffix = chat.getPlayerSuffix((Player) p.getPlayer());
-						return suffix != null ? suffix : "";
-					} catch (Exception e) {
-						return TAB.getInstance().getErrorManager().printError("", "Placeholder %vault-suffix% threw an exception", e);
-					}
-				}
 			});
 		} else {
-			placeholders.add(new ServerPlaceholder("%vault-prefix%", 1000000) {
-				public String get() {
-					return "";
-				}
-			});
-			placeholders.add(new ServerPlaceholder("%vault-suffix%", 1000000) {
-				public String get() {
-					return "";
-				}
-			});
+			manager.registerServerPlaceholder("%tps%", -1, () -> "-1").enableTriggerMode();
 		}
-	}
-
-	/**
-	 * Registers position placeholders
-	 */
-	private void registerPositionPlaceholders() {
-		placeholders.add(new PlayerPlaceholder("%xPos%", 100) {
-			public String get(TabPlayer p) {
-				return String.valueOf(((Player) p.getPlayer()).getLocation().getBlockX());
-			}
+		if (paperMspt) {
+			manager.registerServerPlaceholder("%mspt%", 1000, () -> roundDown.format(Bukkit.getAverageTickTime()));
+		}
+		manager.registerPlayerPlaceholder("%afk%", 500, p -> {
+			if (essentials != null && ((Essentials)essentials).getUser(p.getUniqueId()).isAfk()) return true;
+			return purpur && ((Player)p.getPlayer()).isAfk();
 		});
-		placeholders.add(new PlayerPlaceholder("%yPos%", 100) {
-			public String get(TabPlayer p) {
-				return String.valueOf(((Player) p.getPlayer()).getLocation().getBlockY());
-			}
+		manager.registerPlayerPlaceholder("%essentialsnick%", 1000, p -> {
+			String nickname = null;
+			if (essentials != null)
+				nickname = ((Essentials)essentials).getUser(p.getUniqueId()).getNickname();
+			return nickname == null || nickname.length() == 0 ? p.getName() : nickname;
 		});
-		placeholders.add(new PlayerPlaceholder("%zPos%", 100) {
-			public String get(TabPlayer p) {
-				return String.valueOf(((Player) p.getPlayer()).getLocation().getBlockZ());
-			}
-		});
-	}
-
-	/**
-	 * Registers essentials placeholders
-	 */
-	private void registerEssentialsPlaceholders() {
-		if (Bukkit.getPluginManager().isPluginEnabled("Essentials")) {
-			placeholders.add(new PlayerPlaceholder("%essentialsnick%", 1000) {
-				public String get(TabPlayer p) {
-					String name = null;
-					try {
-						name = (String) getNickname.invoke(getUser.invoke(Bukkit.getPluginManager().getPlugin("Essentials"), p.getPlayer()));
-					} catch (Exception e) {
-						TAB.getInstance().getErrorManager().printError("Failed to get Essentials nickname of " + p.getName(), e);
-					}
-					if (name == null || name.length() == 0) return p.getName();
-					return TAB.getInstance().getConfiguration().essentialsNickPrefix + name;
-				}
-			});
+		if (chat != null) {
+			manager.registerPlayerPlaceholder("%vault-prefix%", 500, p -> ((Chat) chat).getPlayerPrefix((Player) p.getPlayer()));
+			manager.registerPlayerPlaceholder("%vault-suffix%", 500, p -> ((Chat) chat).getPlayerSuffix((Player) p.getPlayer()));
 		} else {
-			placeholders.add(new PlayerPlaceholder("%essentialsnick%", 100000000) {
-				public String get(TabPlayer p) {
-					return p.getName();
-				}
-			});
+			manager.registerServerPlaceholder("%vault-prefix%", -1, () -> "").enableTriggerMode();
+			manager.registerServerPlaceholder("%vault-suffix%", -1, () -> "").enableTriggerMode();
 		}
+		registerOnlinePlaceholders(manager);
+		registerHealthPlaceholder(manager);
 	}
 
-	/**
-	 * Registers synchronous placeholders
-	 */
-	private void registerSyncPlaceholders() {
-		PlaceholderManager pl = TAB.getInstance().getPlaceholderManager();
-		for (String identifier : pl.allUsedPlaceholderIdentifiers) {
-			if (identifier.startsWith("%sync:")) {
-				int refresh;
-				if (pl.serverPlaceholderRefreshIntervals.containsKey(identifier)) {
-					refresh = pl.serverPlaceholderRefreshIntervals.get(identifier);
-				} else if (pl.playerPlaceholderRefreshIntervals.containsKey(identifier)) {
-					refresh = pl.playerPlaceholderRefreshIntervals.get(identifier);
-				} else {
-					refresh = pl.defaultRefresh;
-				}
-				placeholders.add(new PlayerPlaceholder(identifier, refresh) {
+	private String formatTPS(double tps) {
+		return decimal2.format(Math.min(20, tps));
+	}
 
-					@Override
-					public String get(TabPlayer p) {
-						Bukkit.getScheduler().runTask(plugin, new Runnable() {
-
-							@Override
-							public void run() {
-								long time = System.nanoTime();
-								String syncedPlaceholder = identifier.substring(6, identifier.length()-1);
-								String value = ((BukkitPlatform) TAB.getInstance().getPlatform()).setPlaceholders((Player) p.getPlayer(), "%" + syncedPlaceholder + "%");
-								lastValue.put(p.getName(), value);
-								if (!forceUpdate.contains(p.getName())) forceUpdate.add(p.getName());
-								TAB.getInstance().getCPUManager().addPlaceholderTime(getIdentifier(), System.nanoTime()-time);
-							}
-						});
-						return lastValue.get(p.getName());
-					}
-				});
+	private void registerOnlinePlaceholders(PlaceholderManager manager) {
+		manager.registerPlayerPlaceholder("%online%", 1000, p -> {
+			int count = 0;
+			for (TabPlayer all : TAB.getInstance().getOnlinePlayers()){
+				if (((Player) p.getPlayer()).canSee((Player) all.getPlayer())) count++;
 			}
+			return count;
+		});
+		manager.registerPlayerPlaceholder("%staffonline%", 2000, p -> {
+			int count = 0;
+			for (TabPlayer all : TAB.getInstance().getOnlinePlayers()){
+				if (all.hasPermission(TabConstants.Permission.STAFF) && ((Player) p.getPlayer()).canSee((Player) all.getPlayer())) count++;
+			}
+			return count;
+		});
+		manager.registerPlayerPlaceholder("%nonstaffonline%", 2000, p -> {
+			int count = 0;
+			for (TabPlayer all : TAB.getInstance().getOnlinePlayers()){
+				if (!all.hasPermission(TabConstants.Permission.STAFF) && ((Player) p.getPlayer()).canSee((Player) all.getPlayer())) count++;
+			}
+			return count;
+		});
+	}
+
+	@SuppressWarnings("deprecation")
+	private void registerHealthPlaceholder(PlaceholderManager manager) {
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 6) {
+			PlayerPlaceholder health = manager.registerPlayerPlaceholder("%health%", -1, p -> (int) Math.ceil(((Player) p.getPlayer()).getHealth()));
+			health.enableTriggerMode(() -> {
+				healthListener = new Listener() {
+
+					@EventHandler(ignoreCancelled = true, priority = EventPriority.MONITOR)
+					public void onDamage(EntityDamageEvent e) {
+						if (e.getEntity() instanceof Player) {
+							Player p = (Player) e.getEntity();
+							TabPlayer tabp = TAB.getInstance().getPlayer(e.getEntity().getUniqueId());
+							if (tabp == null) return;
+							health.updateValue(tabp, (int) Math.ceil(Math.max(p.getHealth() - e.getFinalDamage(), 0)));
+						}
+					}
+
+					@EventHandler(ignoreCancelled = true, priority = EventPriority.MONITOR)
+					public void onRegain(EntityRegainHealthEvent e) {
+						if (e.getEntity() instanceof Player) {
+							Player p = (Player) e.getEntity();
+							TabPlayer tabp = TAB.getInstance().getPlayer(e.getEntity().getUniqueId());
+							if (tabp == null) return;
+							health.updateValue(tabp, (int) Math.ceil(Math.min(p.getHealth() + e.getAmount(), p.getMaxHealth())));
+						}
+					}
+
+					@EventHandler(ignoreCancelled = true, priority = EventPriority.MONITOR)
+					public void onRespawn(PlayerRespawnEvent e) {
+						health.updateValue(TAB.getInstance().getPlayer(e.getPlayer().getUniqueId()), e.getPlayer().getMaxHealth());
+					}
+				};
+				Bukkit.getPluginManager().registerEvents(healthListener, plugin);
+			}, () -> HandlerList.unregisterAll(healthListener));
 		}
 	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPlatform.java

@@ -2,125 +2,131 @@ package me.neznamy.tab.platforms.bukkit;
 
 import java.io.File;
 import java.util.Collection;
-import java.util.HashSet;
-import java.util.Set;
+import java.util.List;
 
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
-import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.plugin.Plugin;
+
+import com.earth2me.essentials.Essentials;
+import com.mojang.authlib.properties.Property;
+import com.mojang.authlib.properties.PropertyMap;
 
 import me.clip.placeholderapi.PlaceholderAPI;
 import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.api.event.BukkitTABLoadEvent;
-import me.neznamy.tab.platforms.bukkit.features.BossBar_legacy;
-import me.neznamy.tab.platforms.bukkit.features.ExpansionDownloader;
-import me.neznamy.tab.platforms.bukkit.features.PerWorldPlayerlist;
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.protocol.PacketBuilder;
+import me.neznamy.tab.platforms.bukkit.event.TabLoadEvent;
+import me.neznamy.tab.platforms.bukkit.event.TabPlayerLoadEvent;
+import me.neznamy.tab.platforms.bukkit.features.PerWorldPlayerList;
 import me.neznamy.tab.platforms.bukkit.features.PetFix;
 import me.neznamy.tab.platforms.bukkit.features.TabExpansion;
+import me.neznamy.tab.platforms.bukkit.features.WitherBossBar;
 import me.neznamy.tab.platforms.bukkit.features.unlimitedtags.NameTagX;
-import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
 import me.neznamy.tab.platforms.bukkit.permission.Vault;
 import me.neznamy.tab.shared.Platform;
-import me.neznamy.tab.shared.ProtocolVersion;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.features.NameTag;
-import me.neznamy.tab.shared.features.PlaceholderManager;
+import me.neznamy.tab.shared.features.PlaceholderManagerImpl;
+import me.neznamy.tab.shared.features.bossbar.BossBarManagerImpl;
+import me.neznamy.tab.shared.features.nametags.NameTag;
 import me.neznamy.tab.shared.permission.LuckPerms;
 import me.neznamy.tab.shared.permission.None;
 import me.neznamy.tab.shared.permission.PermissionPlugin;
 import me.neznamy.tab.shared.permission.UltraPermissions;
-import me.neznamy.tab.shared.placeholders.Placeholder;
-import me.neznamy.tab.shared.placeholders.PlayerPlaceholder;
-import me.neznamy.tab.shared.placeholders.RelationalPlaceholder;
-import me.neznamy.tab.shared.placeholders.ServerPlaceholder;
+import me.neznamy.tab.shared.placeholders.PlayerPlaceholderImpl;
 import me.neznamy.tab.shared.placeholders.UniversalPlaceholderRegistry;
 import net.milkbowl.vault.permission.Permission;
 
 /**
- * Bukkit implementation of Platform
+ * Bukkit's implementation of Platform interface
  */
 public class BukkitPlatform implements Platform {
 
-	//list of used expansions
-	private Set<String> usedExpansions;
-	
 	//plugin instance
-	private JavaPlugin plugin;
-	
-	//nms storage
-	private NMSStorage nms;
-	
+	private final Main plugin;
+
+	private final BukkitPacketBuilder packetBuilder = new BukkitPacketBuilder();
+
 	//booleans to check plugin presence
-	public boolean placeholderAPI;
-	public boolean viaversion;
-	public boolean idisguise;
-	public boolean libsdisguises;
-	public boolean essentials;
+	private boolean placeholderAPI;
+	private boolean libsDisguises;
+	private Plugin essentials;
 
 	/**
 	 * Constructs new instance with given parameters
 	 * @param plugin - plugin instance
-	 * @param nms - nms storage
 	 */
-	public BukkitPlatform(JavaPlugin plugin, NMSStorage nms) {
+	public BukkitPlatform(Main plugin) {
 		this.plugin = plugin;
-		this.nms = nms;
 	}
 
 	@Override
 	public PermissionPlugin detectPermissionPlugin() {
 		if (Bukkit.getPluginManager().isPluginEnabled("LuckPerms")) {
-			return new LuckPerms(Bukkit.getPluginManager().getPlugin("LuckPerms").getDescription().getVersion());
+			return new LuckPerms(getPluginVersion("LuckPerms"));
 		} else if (Bukkit.getPluginManager().isPluginEnabled("UltraPermissions")) {
-			return new UltraPermissions(Bukkit.getPluginManager().getPlugin("UltraPermissions").getDescription().getVersion());
+			return new UltraPermissions(getPluginVersion("UltraPermissions"));
 		} else if (Bukkit.getPluginManager().isPluginEnabled("Vault")) {
-			return new Vault(Bukkit.getServicesManager().getRegistration(Permission.class).getProvider(), Bukkit.getPluginManager().getPlugin("Vault").getDescription().getVersion());
+			return new Vault(Bukkit.getServicesManager().getRegistration(Permission.class).getProvider(), getPluginVersion("Vault"));
 		} else {
 			return new None();
 		}
 	}
 
 	@Override
-	public void loadFeatures() throws Exception {
-		placeholderAPI = Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI");
-		viaversion = Bukkit.getPluginManager().isPluginEnabled("ViaVersion");
-		idisguise = Bukkit.getPluginManager().isPluginEnabled("iDisguise");
-		libsdisguises = Bukkit.getPluginManager().isPluginEnabled("LibsDisguises");
-		essentials = Bukkit.getPluginManager().isPluginEnabled("Essentials");
-		int version = ProtocolVersion.SERVER_VERSION.getMinorVersion();
-		TAB tab = TAB.getInstance();
-		usedExpansions = new HashSet<String>();
-		tab.getPlaceholderManager().addRegistry(new BukkitPlaceholderRegistry(plugin));
-		tab.getPlaceholderManager().addRegistry(new UniversalPlaceholderRegistry());
-		tab.getPlaceholderManager().registerPlaceholders();
-		if (version >= 8 && tab.getConfiguration().pipelineInjection) {
-			tab.getFeatureManager().registerFeature("injection", new BukkitPipelineInjector(tab, nms));
+	public void loadFeatures() {
+		if (Bukkit.getPluginManager().isPluginEnabled("ViaVersion")) {
+			try {
+				Class.forName("com.viaversion.viaversion.api.Via");
+			} catch (ClassNotFoundException e) {
+				TAB.getInstance().sendConsoleMessage("&c[TAB] An outdated version of ViaVersion (" + getPluginVersion("ViaVersion") + ") was detected.", true);
+				TAB.getInstance().sendConsoleMessage("&c[TAB] TAB only supports ViaVersion 4.0.0 and above. Disabling ViaVersion hook.", true);
+				TAB.getInstance().sendConsoleMessage("&c[TAB] This might cause problems, such as limitations still being present for latest MC clients as well as RGB not working.", true);
+			}
 		}
-		loadNametagFeature(tab);
-		loadUniversalFeatures();
-		if (tab.getConfiguration().bossbar.getBoolean("bossbar-enabled", false) && version < 9) tab.getFeatureManager().registerFeature("bossbar1.8", new BossBar_legacy(tab, plugin));
-		if (version >= 9 && tab.getConfiguration().config.getBoolean("fix-pet-names", false)) tab.getFeatureManager().registerFeature("petfix", new PetFix(nms));
-		if (tab.getConfiguration().config.getBoolean("per-world-playerlist.enabled", false)) tab.getFeatureManager().registerFeature("pwp", new PerWorldPlayerlist(plugin, tab));
+		if (Bukkit.getPluginManager().isPluginEnabled("Tablisknu")) {
+			TAB.getInstance().sendConsoleMessage("&c[TAB] Detected plugin \"Tablisknu\", which causes TAB to not work properly. Consider removing the plugin.", true);
+		}
+		placeholderAPI = Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI");
+		libsDisguises = Bukkit.getPluginManager().isPluginEnabled("LibsDisguises");
+		essentials = Bukkit.getPluginManager().getPlugin("Essentials");
+		TAB tab = TAB.getInstance();
+		if (tab.getConfiguration().isPipelineInjection()) tab.getFeatureManager().registerFeature("injection", new BukkitPipelineInjector());
+		new BukkitPlaceholderRegistry(plugin).registerPlaceholders(tab.getPlaceholderManager());
+		new UniversalPlaceholderRegistry().registerPlaceholders(tab.getPlaceholderManager());
+		loadNameTagFeature(tab);
+		tab.loadUniversalFeatures();
+		if (tab.getConfiguration().getConfig().getBoolean("bossbar.enabled", false)) {
+			if (tab.getServerVersion().getMinorVersion() < 9) {
+				tab.getFeatureManager().registerFeature("bossbar", new WitherBossBar(plugin));
+			} else {
+				tab.getFeatureManager().registerFeature("bossbar", new BossBarManagerImpl());
+			}
+		}
+		if (tab.getServerVersion().getMinorVersion() >= 9 && tab.getConfiguration().getConfig().getBoolean("fix-pet-names.enabled", false)) tab.getFeatureManager().registerFeature("petfix", new PetFix());
+		if (tab.getConfiguration().getConfig().getBoolean("per-world-playerlist.enabled", false)) tab.getFeatureManager().registerFeature("pwp", new PerWorldPlayerList(plugin));
 		if (placeholderAPI) {
 			new TabExpansion(plugin);
-			new ExpansionDownloader(plugin).download(usedExpansions);
 		}
-
 		for (Player p : getOnlinePlayers()) {
-			tab.addPlayer(new BukkitTabPlayer(p));
+			tab.addPlayer(new BukkitTabPlayer(p, plugin.getProtocolVersion(p)));
 		}
 	}
 	
+	private String getPluginVersion(String plugin) {
+		return Bukkit.getPluginManager().getPlugin(plugin).getDescription().getVersion();
+	}
+
 	/**
-	 * Loads nametag feature from config
+	 * Loads NameTag feature from config
 	 * @param tab - tab instance
 	 */
-	private void loadNametagFeature(TAB tab) {
-		if (tab.getConfiguration().config.getBoolean("change-nametag-prefix-suffix", true)) {
-			if (tab.getConfiguration().config.getBoolean("unlimited-nametag-prefix-suffix-mode.enabled", false) && ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 8) {
-				tab.getFeatureManager().registerFeature("nametagx", new NameTagX(plugin, nms, tab));
+	private void loadNameTagFeature(TAB tab) {
+		if (tab.getConfiguration().getConfig().getBoolean("scoreboard-teams.enabled", true)) {
+			if (tab.getConfiguration().getConfig().getBoolean("scoreboard-teams.unlimited-nametag-mode.enabled", false) && tab.getServerVersion().getMinorVersion() >= 8) {
+				tab.getFeatureManager().registerFeature("nametagx", new NameTagX(plugin));
 			} else {
-				tab.getFeatureManager().registerFeature("nametag16", new NameTag(tab));
+				tab.getFeatureManager().registerFeature("nametag16", new NameTag());
 			}
 		}
 	}
@@ -128,159 +134,133 @@ public class BukkitPlatform implements Platform {
 	/**
 	 * Returns list of online players from Bukkit API
 	 * @return list of online players from Bukkit API
-	 * @throws Exception - if reflection fails
 	 */
 	@SuppressWarnings("unchecked")
-	private Player[] getOnlinePlayers() throws Exception {
-		Object players = Bukkit.class.getMethod("getOnlinePlayers").invoke(null);
-		if (players instanceof Player[]) {
-			//1.7.x
-			return (Player[]) players;
-		} else {
-			//1.8+
-			return ((Collection<Player>)players).toArray(new Player[0]); 
+	private Player[] getOnlinePlayers() {
+		try {
+			Object players = Bukkit.class.getMethod("getOnlinePlayers").invoke(null);
+			if (players instanceof Player[]) {
+				//1.7.x
+				return (Player[]) players;
+			} else {
+				//1.8+
+				return ((Collection<Player>)players).toArray(new Player[0]); 
+			}
+		} catch (ReflectiveOperationException e) {
+			TAB.getInstance().getErrorManager().printError("Failed to get online players", e);
+			return new Player[0];
 		}
 	}
 
 	@Override
 	public void sendConsoleMessage(String message, boolean translateColors) {
-		Bukkit.getConsoleSender().sendMessage(translateColors ? message.replace('&', '\u00a7') : message);
+		Bukkit.getConsoleSender().sendMessage(translateColors ? EnumChatFormat.color(message) : message);
 	}
 
 	@Override
 	public void registerUnknownPlaceholder(String identifier) {
-		if (identifier.contains("_")) {
-			PlaceholderManager pl = TAB.getInstance().getPlaceholderManager();
-			if (identifier.startsWith("%rel_")) {
-				//relational placeholder
-				registerRelationalPlaceholder(identifier, pl.getRelationalRefresh(identifier));
+		PlaceholderManagerImpl pl = TAB.getInstance().getPlaceholderManager();
+		if (identifier.startsWith("%rel_")) {
+			//relational placeholder
+			TAB.getInstance().getPlaceholderManager().registerRelationalPlaceholder(identifier, pl.getRelationalRefresh(identifier), (viewer, target) -> 
+				placeholderAPI ? PlaceholderAPI.setRelationalPlaceholders((Player) viewer.getPlayer(), (Player) target.getPlayer(), identifier) : identifier);
+		} else {
+			//normal placeholder
+			if (identifier.startsWith("%sync:")) {
+				int refresh = pl.getServerPlaceholderRefreshIntervals().getOrDefault(identifier,
+						pl.getPlayerPlaceholderRefreshIntervals().getOrDefault(identifier, pl.getDefaultRefresh()));
+				pl.registerPlaceholder(new PlayerPlaceholderImpl(identifier, refresh, null) {
+					
+					@Override
+					public Object request(TabPlayer p) {
+						Bukkit.getScheduler().runTask(plugin, () -> {
+
+							long time = System.nanoTime();
+							String syncedPlaceholder = identifier.substring(6, identifier.length()-1);
+							String value = placeholderAPI ? PlaceholderAPI.setPlaceholders((Player) p.getPlayer(), "%" + syncedPlaceholder + "%") : identifier;
+							getLastValues().put(p.getName(), value);
+							if (!getForceUpdate().contains(p.getName())) getForceUpdate().add(p.getName());
+							TAB.getInstance().getCPUManager().addPlaceholderTime(getIdentifier(), System.nanoTime()-time);
+						});
+						String value = getLastValues().get(p.getName());
+						return value == null ? identifier : value;
+					}
+				});
+				return;
+			}
+			if (pl.getServerPlaceholderRefreshIntervals().containsKey(identifier)) {
+				TAB.getInstance().getPlaceholderManager().registerServerPlaceholder(identifier, pl.getServerPlaceholderRefreshIntervals().get(identifier), () ->
+						placeholderAPI ? PlaceholderAPI.setPlaceholders(null, identifier) : identifier);
 			} else {
-				//normal placeholder
-				String plugin = identifier.split("_")[0].substring(1).toLowerCase();
-				if (plugin.equals("some")) return;
-				usedExpansions.add(plugin);
-				if (pl.serverPlaceholderRefreshIntervals.containsKey(identifier)) {
-					registerServerPlaceholder(identifier, pl.serverPlaceholderRefreshIntervals.get(identifier));
-					return;
-				}
-				if (pl.playerPlaceholderRefreshIntervals.containsKey(identifier)) {
-					registerPlayerPlaceholder(identifier, pl.playerPlaceholderRefreshIntervals.get(identifier));
-					return;
-				}
-				registerPlayerPlaceholder(identifier, pl.defaultRefresh);
+				int refresh = pl.getPlayerPlaceholderRefreshIntervals().getOrDefault(identifier, pl.getDefaultRefresh());
+				TAB.getInstance().getPlaceholderManager().registerPlayerPlaceholder(identifier, refresh, p -> 
+					placeholderAPI ? PlaceholderAPI.setPlaceholders((Player) p.getPlayer(), identifier) : identifier);
 			}
 		}
 	}
-	
-	/**
-	 * Registers server placeholder
-	 * @param identifier - placeholder identifier
-	 * @param refresh - refresh interval in milliseconds
-	 */
-	private void registerServerPlaceholder(String identifier, int refresh) {
-		TAB.getInstance().getPlaceholderManager().registerPlaceholder(new ServerPlaceholder(identifier, TAB.getInstance().getErrorManager().fixPlaceholderInterval(identifier, refresh)){
-			
-			@Override
-			public String get() {
-				return setPlaceholders(null, identifier);
-			}
-		});
-	}
-	
-	/**
-	 * Registers player placeholder
-	 * @param identifier - placeholder identifier
-	 * @param refresh - refresh interval in milliseconds
-	 */
-	private void registerPlayerPlaceholder(String identifier, int refresh) {
-		TAB.getInstance().getPlaceholderManager().registerPlaceholder(new PlayerPlaceholder(identifier, TAB.getInstance().getErrorManager().fixPlaceholderInterval(identifier, refresh)) {
-
-			@Override
-			public String get(TabPlayer p) {
-				return setPlaceholders((Player) p.getPlayer(), identifier);
-			}
-		});
-	}
-	
-	/**
-	 * Registers relational placeholder
-	 * @param identifier - placeholder identifier
-	 * @param refresh - refresh interval in milliseconds
-	 */
-	private void registerRelationalPlaceholder(String identifier, int refresh) {
-		TAB.getInstance().getPlaceholderManager().registerPlaceholder(new RelationalPlaceholder(identifier, TAB.getInstance().getErrorManager().fixPlaceholderInterval(identifier, refresh)) {
-
-			@Override
-			public String get(TabPlayer viewer, TabPlayer target) {
-				if (!placeholderAPI) return identifier;
-				try {
-					return PlaceholderAPI.setRelationalPlaceholders((Player) viewer.getPlayer(), (Player) target.getPlayer(), identifier);
-				} catch (Throwable t) {
-					TAB.getInstance().getErrorManager().printError("PlaceholderAPI v" + Bukkit.getPluginManager().getPlugin("PlaceholderAPI").getDescription().getVersion() + " generated an error when setting relational placeholder " + identifier + " for viewer " + viewer.getName() + " and target " + target.getName(), t, false, TAB.getInstance().getErrorManager().papiErrorLog);
-				}
-				return identifier;
-			}
-		});
-	}
-	
-	/**
-	 * Runs PlaceholderAPI call and returns the output. If the task fails, error is logged and "ERROR" returned instead
-	 * @param player - player to set placeholder for
-	 * @param placeholder - placeholder
-	 * @return result from PlaceholderAPI
-	 */
-	public String setPlaceholders(Player player, String placeholder) {
-		if (!placeholderAPI) return placeholder;
-		try {
-			return PlaceholderAPI.setPlaceholders(player, placeholder);
-		} catch (Throwable t) {
-			String playername = (player == null ? "<null>" : player.getName());
-			TAB.getInstance().getErrorManager().printError("PlaceholderAPI v" + Bukkit.getPluginManager().getPlugin("PlaceholderAPI").getDescription().getVersion() + " generated an error when setting placeholder " + placeholder + " for player " + playername, t, false, TAB.getInstance().getErrorManager().papiErrorLog);
-			return "ERROR";
-		}
-	}
 
 	@Override
 	public String getServerVersion() {
 		return Bukkit.getBukkitVersion().split("-")[0] + " (" + Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3] + ")";
 	}
 
-	@Override
-	public String getSeparatorType() {
-		return "world";
-	}
-
 	@Override
 	public File getDataFolder() {
 		return plugin.getDataFolder();
 	}
-	
-	@Override
-	public String replaceAllPlaceholders(String string, TabPlayer sender) {
-		if (string == null) return null;
-		String replaced = string;
-		for (Placeholder p : TAB.getInstance().getPlaceholderManager().getAllPlaceholders()) {
-			if (replaced.contains(p.getIdentifier())) {
-				if (p instanceof ServerPlaceholder) {
-					((ServerPlaceholder)p).update();
-				}
-				if (p instanceof PlayerPlaceholder) {
-					((PlayerPlaceholder)p).update(sender);
-				}
-				replaced = p.set(replaced, sender);
-			}
-		}
-		replaced = setPlaceholders(sender == null ? null : (Player) sender.getPlayer(), replaced);
-		return replaced;
-	}
 
 	@Override
 	public void callLoadEvent() {
-		Bukkit.getPluginManager().callEvent(new BukkitTABLoadEvent());
+		Bukkit.getPluginManager().callEvent(new TabLoadEvent());
+	}
+
+	@Override
+	public void callLoadEvent(TabPlayer player) {
+		Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, () -> Bukkit.getPluginManager().callEvent(new TabPlayerLoadEvent(player)));
 	}
 
 	@Override
 	public int getMaxPlayers() {
 		return Bukkit.getMaxPlayers();
 	}
+
+	public boolean isLibsDisguisesEnabled() {
+		return libsDisguises;
+	}
+	
+	public void setLibsDisguisesEnabled(boolean enabled) {
+		libsDisguises = enabled;
+	}
+
+	public Essentials getEssentials() {
+		return (Essentials) essentials;
+	}
+
+	@Override
+	public PacketBuilder getPacketBuilder() {
+		return packetBuilder;
+	}
+
+	@SuppressWarnings("unchecked")
+	@Override
+	public Object getSkin(List<String> properties) {
+		PropertyMap map = new PropertyMap();
+		map.put("textures", new Property("textures", properties.get(0), properties.get(1)));
+		return map;
+	}
+	
+	@Override
+	public boolean isProxy() {
+		return false;
+	}
+
+	@Override
+	public boolean isPluginEnabled(String plugin) {
+		return Bukkit.getPluginManager().isPluginEnabled(plugin);
+	}
+
+	@Override
+	public String getConfigName() {
+		return "bukkitconfig.yml";
+	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitTabPlayer.java

@@ -1,214 +1,260 @@
 package me.neznamy.tab.platforms.bukkit;
 
-import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
 
 import org.bukkit.Bukkit;
-import org.bukkit.entity.Entity;
+import org.bukkit.boss.BarColor;
+import org.bukkit.boss.BarFlag;
+import org.bukkit.boss.BarStyle;
+import org.bukkit.boss.BossBar;
 import org.bukkit.entity.Player;
-import org.bukkit.plugin.RegisteredServiceProvider;
+import org.bukkit.metadata.MetadataValue;
 import org.bukkit.potion.PotionEffectType;
 
-import io.netty.buffer.ByteBuf;
+import com.earth2me.essentials.Essentials;
+import com.mojang.authlib.GameProfile;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.legacy.bossbar.BossColor;
+import com.viaversion.viaversion.api.legacy.bossbar.BossFlag;
+import com.viaversion.viaversion.api.legacy.bossbar.BossStyle;
+
 import io.netty.channel.Channel;
+import me.libraryaddict.disguise.DisguiseAPI;
+import me.neznamy.tab.api.ProtocolVersion;
+import me.neznamy.tab.api.chat.rgb.RGBUtils;
+import me.neznamy.tab.api.protocol.PacketPlayOutBoss;
 import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
 import me.neznamy.tab.shared.ITabPlayer;
-import me.neznamy.tab.shared.ProtocolVersion;
 import me.neznamy.tab.shared.TAB;
-import us.myles.ViaVersion.api.Via;
 
 /**
  * TabPlayer for Bukkit
  */
 public class BukkitTabPlayer extends ITabPlayer {
 
-	//bukkit player
-	private Player player;
-
 	//nms handle
 	private Object handle;
 
 	//nms player connection
 	private Object playerConnection;
+	
+	//player's visible boss bars
+	private final Map<UUID, BossBar> bossBars = new HashMap<>();
+	private final Map<UUID, com.viaversion.viaversion.api.legacy.bossbar.BossBar> viaBossBars = new HashMap<>();
 
 	/**
 	 * Constructs new instance with given parameter
 	 * @param p - bukkit player
 	 */
-	public BukkitTabPlayer(Player p){
-		player = p;
-		world = p.getWorld().getName();
+	public BukkitTabPlayer(Player p, int protocolVersion){
+		super(p, p.getUniqueId(), p.getName(), "N/A", p.getWorld().getName());
 		try {
 			handle = NMSStorage.getInstance().getHandle.invoke(player);
 			playerConnection = NMSStorage.getInstance().PLAYER_CONNECTION.get(handle);
-		} catch (Exception e) {
-			TAB.getInstance().getErrorManager().printError("Failed to get playerConnection of " + p.getName(), e);
-		}
-		try {
 			if (NMSStorage.getInstance().CHANNEL != null)
 				channel = (Channel) NMSStorage.getInstance().CHANNEL.get(NMSStorage.getInstance().NETWORK_MANAGER.get(playerConnection));
-		} catch (Exception e) {
-			TAB.getInstance().getErrorManager().printError("Failed to get channel of " + p.getName(), e);
-		}
-		uniqueId = p.getUniqueId();
-		name = p.getName();
-		version = ProtocolVersion.fromNetworkId(getProtocolVersion());
-		init();
-	}
-
-	/**
-	 * Gets protocol version and returns it
-	 * @return protocol version of this player
-	 */
-	private int getProtocolVersion() {
-		if (Bukkit.getPluginManager().isPluginEnabled("ProtocolSupport")){
-			int version = getProtocolVersionPS();
-			//some PS versions return -1 on unsupported server versions instead of throwing exception
-			if (version != -1 && version < ProtocolVersion.SERVER_VERSION.getNetworkId()) return version;
-		}
-		if (((BukkitPlatform)TAB.getInstance().getPlatform()).viaversion) {
-			return getProtocolVersionVia();
-		}
-		return ProtocolVersion.SERVER_VERSION.getNetworkId();
-	}
-
-	/**
-	 * Returns protocol version of this player using ProtocolSupport
-	 * @return protocol version of this player using ProtocolSupport
-	 */
-	private int getProtocolVersionPS(){
-		try {
-			Object protocolVersion = Class.forName("protocolsupport.api.ProtocolSupportAPI").getMethod("getProtocolVersion", Player.class).invoke(null, player);
-			int version = (int) protocolVersion.getClass().getMethod("getId").invoke(protocolVersion);
-			TAB.getInstance().debug("ProtocolSupport returned protocol version " + version + " for " + getName());
-			return version;
-		} catch (Throwable e) {
-			return TAB.getInstance().getErrorManager().printError(ProtocolVersion.SERVER_VERSION.getNetworkId(), "Failed to get protocol version of " + getName() + " using ProtocolSupport", e);
-		}
-	}
-
-	/**
-	 * Returns protocol version of this player using ViaVersion
-	 * @return protocol version of this player using ViaVersion
-	 */
-	private int getProtocolVersionVia(){
-		try {
-			int version = Via.getAPI().getPlayerVersion(uniqueId);
-			TAB.getInstance().debug("ViaVersion returned protocol version " + version + " for " + getName());
-			return version;
-		} catch (Throwable e) {
-			return TAB.getInstance().getErrorManager().printError(ProtocolVersion.SERVER_VERSION.getNetworkId(), "Failed to get protocol version of " + getName() + " using ViaVersion", e);
+		} catch (ReflectiveOperationException e) {
+			TAB.getInstance().getErrorManager().printError("Failed to get playerConnection or channel of " + p.getName(), e);
 		}
+		version = ProtocolVersion.fromNetworkId(protocolVersion);
 	}
 
 	@Override
 	public boolean hasPermission(String permission) {
-		return player.hasPermission(permission);
+		long time = System.nanoTime();
+		boolean value = getPlayer().hasPermission(permission);
+		TAB.getInstance().getCPUManager().addMethodTime("hasPermission", System.nanoTime()-time);
+		return value;
 	}
 
 	@Override
-	public long getPing() {
+	public int getPing() {
 		try {
 			int ping = NMSStorage.getInstance().PING.getInt(handle);
 			if (ping > 10000 || ping < 0) ping = -1;
 			return ping;
-		} catch (Exception e) {
+		} catch (IllegalAccessException e) {
 			return -1;
 		}
 	}
 
 	@Override
 	public void sendPacket(Object nmsPacket) {
-		if (nmsPacket == null || !player.isOnline()) return;
+		if (nmsPacket == null || !getPlayer().isOnline()) return;
+		long time = System.nanoTime();
 		try {
-			if (((BukkitPlatform)TAB.getInstance().getPlatform()).viaversion && nmsPacket instanceof ByteBuf) {
-				try {
-					Via.getAPI().sendRawPacket(uniqueId, (ByteBuf) nmsPacket);
-				} catch (IllegalArgumentException e) {
-					//java.lang.IllegalArgumentException: This player is not controlled by ViaVersion!
-					//this is only used to send 1.9 bossbar packets on 1.8 servers, no idea why it does this sometimes
+			if (nmsPacket instanceof PacketPlayOutBoss) {
+				if (TAB.getInstance().getServerVersion().getMinorVersion() >= 9) {
+					handle((PacketPlayOutBoss) nmsPacket);
+				} else {
+					handleVia((PacketPlayOutBoss) nmsPacket);
 				}
-				return;
+			} else {
+				NMSStorage.getInstance().sendPacket.invoke(playerConnection, nmsPacket);
 			}
-			NMSStorage.getInstance().sendPacket.invoke(playerConnection, nmsPacket);
-		} catch (Throwable e) {
+		} catch (ReflectiveOperationException e) {
 			TAB.getInstance().getErrorManager().printError("An error occurred when sending " + nmsPacket.getClass().getSimpleName(), e);
 		}
+		TAB.getInstance().getCPUManager().addMethodTime("sendPacket", System.nanoTime()-time);
+	}
+	
+	private void handle(PacketPlayOutBoss packet) {
+		BossBar bar = bossBars.get(packet.getId());
+		if (bar == null && packet.getOperation() != PacketPlayOutBoss.Action.ADD) return; //no idea how
+		switch (packet.getOperation()) {
+		case ADD:
+			if (bossBars.containsKey(packet.getId())) return;
+			bar = Bukkit.createBossBar(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16 && TAB.getInstance().getServerVersion().getMinorVersion() >= 16), 
+					BarColor.valueOf(packet.getColor().name()), 
+					BarStyle.valueOf(packet.getOverlay().getBukkitName()));
+			if (packet.isCreateWorldFog()) bar.addFlag(BarFlag.CREATE_FOG);
+			if (packet.isDarkenScreen()) bar.addFlag(BarFlag.DARKEN_SKY);
+			if (packet.isPlayMusic()) bar.addFlag(BarFlag.PLAY_BOSS_MUSIC);
+			bar.setProgress(packet.getPct());
+			bossBars.put(packet.getId(), bar);
+			bar.addPlayer(getPlayer());
+			break;
+		case REMOVE:
+			bar.removePlayer(getPlayer());
+			bossBars.remove(packet.getId());
+			break;
+		case UPDATE_PCT:
+			bar.setProgress(packet.getPct());
+			break;
+		case UPDATE_NAME:
+			bar.setTitle(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16 && TAB.getInstance().getServerVersion().getMinorVersion() >= 16));
+			break;
+		case UPDATE_STYLE:
+			bar.setColor(BarColor.valueOf(packet.getColor().name()));
+			bar.setStyle(BarStyle.valueOf(packet.getOverlay().getBukkitName()));
+			break;
+		case UPDATE_PROPERTIES:
+			bar = bossBars.get(packet.getId());
+			processFlag(bar, packet.isCreateWorldFog(), BarFlag.CREATE_FOG);
+			processFlag(bar, packet.isDarkenScreen(), BarFlag.DARKEN_SKY);
+			processFlag(bar, packet.isPlayMusic(), BarFlag.PLAY_BOSS_MUSIC);
+			break;
+		default:
+			break;
+		}
+	}
+	
+	private void handleVia(PacketPlayOutBoss packet) {
+		com.viaversion.viaversion.api.legacy.bossbar.BossBar bar;
+		switch (packet.getOperation()) {
+		case ADD:
+			if (viaBossBars.containsKey(packet.getId())) return;
+			bar = Via.getAPI().legacyAPI().createLegacyBossBar(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16), 
+					packet.getPct(),
+					BossColor.valueOf(packet.getColor().name()), 
+					BossStyle.valueOf(packet.getOverlay().getBukkitName()));
+			//fog missing from via API
+			if (packet.isDarkenScreen()) bar.addFlag(BossFlag.DARKEN_SKY);
+			if (packet.isPlayMusic()) bar.addFlag(BossFlag.PLAY_BOSS_MUSIC);
+			viaBossBars.put(packet.getId(), bar);
+			bar.addPlayer(getPlayer().getUniqueId());
+			break;
+		case REMOVE:
+			viaBossBars.get(packet.getId()).removePlayer(getPlayer().getUniqueId());
+			viaBossBars.remove(packet.getId());
+			break;
+		case UPDATE_PCT:
+			viaBossBars.get(packet.getId()).setHealth(packet.getPct());
+			break;
+		case UPDATE_NAME:
+			viaBossBars.get(packet.getId()).setTitle(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16));
+			break;
+		case UPDATE_STYLE:
+			viaBossBars.get(packet.getId()).setColor(BossColor.valueOf(packet.getColor().name()));
+			viaBossBars.get(packet.getId()).setStyle(BossStyle.valueOf(packet.getOverlay().getBukkitName()));
+			break;
+		case UPDATE_PROPERTIES:
+			bar = viaBossBars.get(packet.getId());
+			//fog missing from via API
+			processFlagVia(bar, packet.isDarkenScreen(), BossFlag.DARKEN_SKY);
+			processFlagVia(bar, packet.isPlayMusic(), BossFlag.PLAY_BOSS_MUSIC);
+			break;
+		default:
+			break;
+		}
+	}
+	
+	private void processFlag(BossBar bar, boolean targetValue, BarFlag flag) {
+		if (targetValue) {
+			if (!bar.hasFlag(flag)) {
+				bar.addFlag(flag);
+			}
+		} else {
+			if (bar.hasFlag(flag)) {
+				bar.removeFlag(flag);
+			}
+		}
+	}
+	
+	private void processFlagVia(com.viaversion.viaversion.api.legacy.bossbar.BossBar bar, boolean targetValue, BossFlag flag) {
+		if (targetValue) {
+			if (!bar.hasFlag(flag)) {
+				bar.addFlag(flag);
+			}
+		} else {
+			if (bar.hasFlag(flag)) {
+				bar.removeFlag(flag);
+			}
+		}
 	}
 
 	@Override
 	public boolean hasInvisibilityPotion() {
-		return player.hasPotionEffect(PotionEffectType.INVISIBILITY);
+		return getPlayer().hasPotionEffect(PotionEffectType.INVISIBILITY);
 	}
 
 	@Override
 	public boolean isDisguised() {
-		return isDisguisedLD() || isDisguisediDis();
-	}
-
-	/**
-	 * Returns disguise status of player using LibsDisguises
-	 * @return disguise status of player using LibsDisguises
-	 */
-	private boolean isDisguisedLD() {
 		try {
-			if (!((BukkitPlatform)TAB.getInstance().getPlatform()).libsdisguises) return false;
-			return (boolean) Class.forName("me.libraryaddict.disguise.DisguiseAPI").getMethod("isDisguised", Entity.class).invoke(null, player);
-		} catch (Throwable e) {
-			return TAB.getInstance().getErrorManager().printError(false, "Failed to check disguise status using LibsDisguises", e);
-		}
-	}
-
-	/**
-	 * Returns disguise status of player using iDisguise
-	 * @return disguise status of player using iDisguise
-	 */
-	private boolean isDisguisediDis() {
-		try {
-			if (!((BukkitPlatform)TAB.getInstance().getPlatform()).idisguise) return false;
-			RegisteredServiceProvider<?> provider = Bukkit.getServicesManager().getRegistration(Class.forName("de.robingrether.idisguise.api.DisguiseAPI"));
-			Object iDisguise = provider.getProvider();
-			Method m = iDisguise.getClass().getMethod("isDisguised", Player.class);
-			m.setAccessible(true);
-			return (boolean) m.invoke(iDisguise, player);
-		} catch (Throwable e) {
-			return TAB.getInstance().getErrorManager().printError(false, "Failed to check disguise status using iDisguise", e);
+			if (!((BukkitPlatform)TAB.getInstance().getPlatform()).isLibsDisguisesEnabled()) return false;
+			return DisguiseAPI.isDisguised(getPlayer());
+		} catch (NoClassDefFoundError | ExceptionInInitializerError e) {
+			//java.lang.NoClassDefFoundError: Could not initialize class me.libraryaddict.disguise.DisguiseAPI
+			TAB.getInstance().getErrorManager().printError("Failed to check disguise status using LibsDisguises", e);
+			((BukkitPlatform)TAB.getInstance().getPlatform()).setLibsDisguisesEnabled(false);
+			return false;
 		}
 	}
 
 	@Override
 	public Object getSkin() {
 		try {
-			return Class.forName("com.mojang.authlib.GameProfile").getMethod("getProperties").invoke(NMSStorage.getInstance().getProfile.invoke(handle));
-		} catch (Throwable e) {
-			return TAB.getInstance().getErrorManager().printError(null, "Failed to get skin of " + getName(), e);
+			return ((GameProfile)NMSStorage.getInstance().getProfile.invoke(handle)).getProperties();
+		} catch (ReflectiveOperationException e) {
+			TAB.getInstance().getErrorManager().printError("Failed to get skin of " + getName(), e);
+			return null;
 		}
 	}
 
 	@Override
 	public Player getPlayer() {
-		return player;
+		return (Player) player;
 	}
 
 	@Override
 	public boolean isOnline() {
-		return player.isOnline();
+		return getPlayer().isOnline();
 	}
 
 	@Override
 	public boolean isVanished() {
-		try {
-			if (((BukkitPlatform)TAB.getInstance().getPlatform()).essentials) {
-				Object essentials = Bukkit.getPluginManager().getPlugin("Essentials");
-				Object user = essentials.getClass().getMethod("getUser", Player.class).invoke(essentials, player);
-				boolean vanished = (boolean) user.getClass().getMethod("isVanished").invoke(user);
-				if (vanished) return true;
-			}
-			if (player.hasMetadata("vanished") && !player.getMetadata("vanished").isEmpty()) {
-				return player.getMetadata("vanished").get(0).asBoolean();
-			}
-		} catch (Exception e) {
-			TAB.getInstance().getErrorManager().printError("Failed to check vanish status of " + player.getName(), e);
-		}
-		return false;
+		Essentials essentials = ((BukkitPlatform)TAB.getInstance().getPlatform()).getEssentials();
+		if (essentials != null && essentials.getUser(getUniqueId()).isVanished()) return true;
+		List<MetadataValue> metadata = getPlayer().getMetadata("vanished");
+		return !metadata.isEmpty() && metadata.get(0).asBoolean();
+	}
+
+	@SuppressWarnings("deprecation")
+	@Override
+	public int getGamemode() {
+		return getPlayer().getGameMode().getValue();
 	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/Main.java

@@ -1,47 +1,60 @@
 package me.neznamy.tab.platforms.bukkit;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import org.bstats.bukkit.Metrics;
+import org.bstats.charts.SimplePie;
 import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
 
+import com.viaversion.viaversion.api.Via;
+
+import me.neznamy.tab.api.ProtocolVersion;
+import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.api.chat.EnumChatFormat;
 import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
-import me.neznamy.tab.shared.ProtocolVersion;
 import me.neznamy.tab.shared.TAB;
+import me.neznamy.tab.shared.TabConstants;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * Main class for Bukkit platform
  */
 public class Main extends JavaPlugin {
 	
+	private boolean viaVersion;
+	private boolean protocolSupport;
+	
 	@Override
 	public void onEnable(){
-		ProtocolVersion.SERVER_VERSION = ProtocolVersion.fromFriendlyName(Bukkit.getBukkitVersion().split("-")[0]);
-		Bukkit.getConsoleSender().sendMessage("\u00a77[TAB] Server version: " + Bukkit.getBukkitVersion().split("-")[0] + " (" + Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3] + ")");
+		Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&7[TAB] Server version: " + Bukkit.getBukkitVersion().split("-")[0] + " (" + Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3] + ")"));
 		if (!isVersionSupported()){
 			Bukkit.getPluginManager().disablePlugin(this);
 			return;
 		}
-		if (ProtocolVersion.SERVER_VERSION == ProtocolVersion.UNKNOWN) {
-			Bukkit.getConsoleSender().sendMessage("\u00a7c[TAB] Unknown server version: " + Bukkit.getBukkitVersion() + "! Plugin may not work correctly.");
+		viaVersion = Bukkit.getPluginManager().isPluginEnabled("ViaVersion");
+		protocolSupport = Bukkit.getPluginManager().isPluginEnabled("ProtocolSupport");
+		TAB.setInstance(new TAB(new BukkitPlatform(this), ProtocolVersion.fromFriendlyName(Bukkit.getBukkitVersion().split("-")[0])));
+		if (TAB.getInstance().getServerVersion() == ProtocolVersion.UNKNOWN) {
+			Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Unknown server version: " + Bukkit.getBukkitVersion() + "! Plugin may not work correctly."));
 		}
-		TAB.setInstance(new TAB(new BukkitPlatform(this, NMSStorage.getInstance()), new BukkitPacketBuilder(NMSStorage.getInstance())));
-		Bukkit.getPluginManager().registerEvents(new BukkitEventListener(), this);
-		Bukkit.getPluginCommand("tab").setExecutor((sender, c, cmd, args) -> {
-			if (TAB.getInstance().isDisabled()) {
-				for (String message : TAB.getInstance().disabledCommand.execute(args, sender.hasPermission("tab.reload"), sender.hasPermission("tab.admin"))) {
-					sender.sendMessage(message.replace('&', '\u00a7'));
-				}
-			} else {
-				TAB.getInstance().command.execute(sender instanceof Player ? TAB.getInstance().getPlayer(((Player)sender).getUniqueId()) : null, args);
-			}
-			return false;
-		});
-		Bukkit.getPluginCommand("tab").setTabCompleter((sender, c, cmd, args) -> TAB.getInstance().command.complete(sender instanceof Player ? TAB.getInstance().getPlayer(((Player)sender).getUniqueId()) : null, args));
+		Bukkit.getPluginManager().registerEvents(new BukkitEventListener(this), this);
+		TABCommand command = new TABCommand();
+		Bukkit.getPluginCommand("tab").setExecutor(command);
+		Bukkit.getPluginCommand("tab").setTabCompleter(command);
 		TAB.getInstance().load();
-		new BukkitMetrics(this);
+		Metrics metrics = new Metrics(this, 5304);
+		metrics.addCustomChart(new SimplePie("unlimited_nametag_mode_enabled", () -> TAB.getInstance().getFeatureManager().isFeatureEnabled("nametagx") ? "Yes" : "No"));
+		metrics.addCustomChart(new SimplePie("placeholderapi", () -> Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI") ? "Yes" : "No"));
+		metrics.addCustomChart(new SimplePie("permission_system", () -> TAB.getInstance().getGroupManager().getPlugin().getName()));
+		metrics.addCustomChart(new SimplePie("server_version", () -> "1." + TAB.getInstance().getServerVersion().getMinorVersion() + ".x"));
 	}
 
 	@Override
@@ -55,26 +68,121 @@ public class Main extends JavaPlugin {
 	 * @return true if compatible, false if not
 	 */
 	private boolean isVersionSupported(){
-		List<String> SUPPORTED_VERSIONS = Arrays.asList(
+		List<String> supportedVersions = Arrays.asList(
+				"v1_5_R1", "v1_5_R2", "v1_5_R3", "v1_6_R1", "v1_6_R2", "v1_6_R3",
 				"v1_7_R1", "v1_7_R2", "v1_7_R3", "v1_7_R4", "v1_8_R1", "v1_8_R2", "v1_8_R3",
 				"v1_9_R1", "v1_9_R2", "v1_10_R1", "v1_11_R1", "v1_12_R1", "v1_13_R1", "v1_13_R2",
-				"v1_14_R1", "v1_15_R1", "v1_16_R1", "v1_16_R2", "v1_16_R3");
+				"v1_14_R1", "v1_15_R1", "v1_16_R1", "v1_16_R2", "v1_16_R3", "v1_17_R1", "v1_18_R1");
 		String serverPackage = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
 		try {
+			long time = System.currentTimeMillis();
 			NMSStorage.setInstance(new NMSStorage());
-			if (SUPPORTED_VERSIONS.contains(serverPackage)) {
+			if (supportedVersions.contains(serverPackage)) {
+				Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&7[TAB] Loaded NMS hook in " + (System.currentTimeMillis()-time) + "ms"));
 				return true;
 			} else {
-				Bukkit.getConsoleSender().sendMessage("\u00a7c[TAB] This plugin version does not claim to support your server version. This jar has only been tested on 1.7.x - 1.16.5. Disabling.");
+				Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] No compatibility issue was found, but this plugin version does not claim to support your server version. This jar has only been tested on 1.5.x - 1.18. Disabling just to stay safe."));
 			}
-		} catch (Throwable e) {
-			if (SUPPORTED_VERSIONS.contains(serverPackage)) {
-				Bukkit.getConsoleSender().sendMessage("\u00a7c[TAB] Your server version is marked as compatible, but a compatibility issue was found. Please report the error below (include your server version & fork too)");
-				e.printStackTrace();
+		} catch (Exception ex) {
+			if (supportedVersions.contains(serverPackage)) {
+				Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Your server version is marked as compatible, but a compatibility issue was found. Please report the error below (include your server version & fork too)"));
+				Bukkit.getConsoleSender().sendMessage(ex.getClass().getName() + ": " + ex.getMessage());
+				for (StackTraceElement e : ex.getStackTrace()) {
+					Bukkit.getConsoleSender().sendMessage("\t" + e.toString());
+				}
 			} else {
-				Bukkit.getConsoleSender().sendMessage("\u00a7c[TAB] Your server version is completely unsupported. This plugin version only supports 1.7.x - 1.16.5. Disabling.");
+				Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Your server version is completely unsupported. This plugin version only supports 1.5.x - 1.18. Disabling."));
 			}
 		}
 		return false;
 	}
+	
+	/**
+	 * Gets protocol version and returns it
+	 * @return protocol version of this player
+	 */
+	public int getProtocolVersion(Player player) {
+		if (protocolSupport){
+			int version = getProtocolVersionPS(player);
+			//some PS versions return -1 on unsupported server versions instead of throwing exception
+			if (version != -1 && version < TAB.getInstance().getServerVersion().getNetworkId()) return version;
+		}
+		if (viaVersion) {
+			return getProtocolVersionVia(player, 0);
+		}
+		return TAB.getInstance().getServerVersion().getNetworkId();
+	}
+
+	/**
+	 * Returns protocol version of this player using ProtocolSupport
+	 * @return protocol version of this player using ProtocolSupport
+	 */
+	private int getProtocolVersionPS(Player player){
+		try {
+			Object protocolVersion = Class.forName("protocolsupport.api.ProtocolSupportAPI").getMethod("getProtocolVersion", Player.class).invoke(null, player);
+			int version = (int) protocolVersion.getClass().getMethod("getId").invoke(protocolVersion);
+			TAB.getInstance().debug("ProtocolSupport returned protocol version " + version + " for " + player.getName() + "(online=" + player.isOnline() + ")");
+			return version;
+		} catch (ReflectiveOperationException e) {
+			TAB.getInstance().getErrorManager().printError(String.format("Failed to get protocol version of %s using ProtocolSupport", player.getName()), e);
+			return TAB.getInstance().getServerVersion().getNetworkId();
+		}
+	}
+
+	/**
+	 * Returns protocol version of this player using ViaVersion
+	 * @return protocol version of this player using ViaVersion
+	 */
+	private int getProtocolVersionVia(Player player, int retryLevel){
+		try {
+			if (retryLevel == 10) {
+				TAB.getInstance().debug("Failed to get protocol version of " + player.getName() + " after 10 retries");
+				return TAB.getInstance().getServerVersion().getNetworkId();
+			}
+			int version = Via.getAPI().getPlayerVersion(player.getUniqueId());
+			if (version == -1) {
+				if (!player.isOnline()) return TAB.getInstance().getServerVersion().getNetworkId();
+				Thread.sleep(5);
+				return getProtocolVersionVia(player, retryLevel + 1);
+			}
+			TAB.getInstance().debug("ViaVersion returned protocol version " + version + " for " + player.getName() + "(online=" + player.isOnline() + ")");
+			return version;
+		} catch (InterruptedException e) {
+			Thread.currentThread().interrupt();
+			return -1;
+		} catch (Exception | NoClassDefFoundError e) {
+			TAB.getInstance().getErrorManager().printError(String.format("Failed to get protocol version of %s using ViaVersion v%s", player.getName(), Bukkit.getPluginManager().getPlugin("ViaVersion").getDescription().getVersion()), e);
+			return TAB.getInstance().getServerVersion().getNetworkId();
+		}
+	}
+	
+	public static class TABCommand implements CommandExecutor, TabCompleter {
+
+		@Override
+		public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+			if (TAB.getInstance().isDisabled()) {
+				for (String message : TAB.getInstance().getDisabledCommand().execute(args, sender.hasPermission(TabConstants.Permission.COMMAND_RELOAD), sender.hasPermission(TabConstants.Permission.COMMAND_ALL))) {
+					sender.sendMessage(EnumChatFormat.color(message));
+				}
+			} else {
+				TabPlayer p = null;
+				if (sender instanceof Player) {
+					p = TAB.getInstance().getPlayer(((Player)sender).getUniqueId());
+					if (p == null) return true; //player not loaded correctly
+				}
+				TAB.getInstance().getCommand().execute(p, args);
+			}
+			return false;
+		}
+
+		@Override
+		public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+			TabPlayer p = null;
+			if (sender instanceof Player) {
+				p = TAB.getInstance().getPlayer(((Player)sender).getUniqueId());
+				if (p == null) return new ArrayList<>(); //player not loaded correctly
+			}
+			return TAB.getInstance().getCommand().complete(p, args);
+		}
+	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/event/TabLoadEvent.java

@@ -1,22 +1,23 @@
-package me.neznamy.tab.api.event;
+package me.neznamy.tab.platforms.bukkit.event;
 
 import org.bukkit.event.Event;
 import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * Bukkit event that is called each time TAB fully loads. This includes server startup, reload,
  * /tab reload and /plugman reload tab
  */
-public class BukkitTABLoadEvent extends Event {
+public class TabLoadEvent extends Event {
 
 	private static final HandlerList handlers = new HandlerList();
 
 	@Override
-	public HandlerList getHandlers(){
-		return handlers;
+	public @NotNull HandlerList getHandlers(){
+		return getHandlerList();
 	}
-
-	public static HandlerList getHandlerList(){
+	
+	public static HandlerList getHandlerList() {
 		return handlers;
 	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/event/TabPlayerLoadEvent.java

@@ -0,0 +1,34 @@
+package me.neznamy.tab.platforms.bukkit.event;
+
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Bukkit event that is called when player is successfully loaded after joining. This also includes plugin reloading.
+ */
+public class TabPlayerLoadEvent extends Event {
+
+	private static final HandlerList handlers = new HandlerList();
+
+	private final TabPlayer player;
+	
+	public TabPlayerLoadEvent(TabPlayer player) {
+		this.player = player;
+	}
+	
+	@Override
+	public @NotNull HandlerList getHandlers(){
+		return getHandlerList();
+	}
+	
+	public static HandlerList getHandlerList() {
+		return handlers;
+	}
+	
+	public TabPlayer getPlayer() {
+		return player;
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/BossBar_legacy.java

@@ -1,87 +0,0 @@
-package me.neznamy.tab.platforms.bukkit.features;
-
-import org.bukkit.Bukkit;
-import org.bukkit.Location;
-import org.bukkit.entity.Player;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.HandlerList;
-import org.bukkit.event.Listener;
-import org.bukkit.event.player.PlayerRespawnEvent;
-import org.bukkit.plugin.java.JavaPlugin;
-
-import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.platforms.bukkit.BukkitPacketBuilder;
-import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.cpu.UsageType;
-import me.neznamy.tab.shared.features.bossbar.BossBar;
-import me.neznamy.tab.shared.features.types.Loadable;
-
-/**
- * An additional class with additional code for <1.9 servers due to an entity being required
- */
-public class BossBar_legacy implements Listener, Loadable {
-
-	//distance of wither in blocks
-	private final int WITHER_DISTANCE = 75;
-	
-	//main bossbar feature
-	private BossBar mainFeature;
-	
-	/**
-	 * Constructs a new instance of the class
-	 * @param mainFeature - main bossbar feature
-	 */
-	public BossBar_legacy(TAB tab, JavaPlugin plugin) {
-		this.mainFeature = (BossBar) tab.getFeatureManager().getFeature("bossbar");
-		Bukkit.getPluginManager().registerEvents(this, plugin);
-		//bar disappears in client after ~1 second of not seeing boss entity
-		tab.getCPUManager().startRepeatingMeasuredTask(900, "refreshing bossbar", TabFeature.BOSSBAR, UsageType.TELEPORTING_ENTITY, () -> teleport());
-	}
-	
-	@Override
-	public void load() {
-		teleport();
-	}
-	
-	/**
-	 * Updates wither location for all players
-	 */
-	private void teleport() {
-		for (TabPlayer all : TAB.getInstance().getPlayers()) {
-			if (all.getVersion().getMinorVersion() > 8) continue; //sending VV packets to those
-			for (me.neznamy.tab.api.bossbar.BossBar l : all.getActiveBossBars()) {
-				try {
-					all.sendPacket(((BukkitPacketBuilder)TAB.getInstance().getPacketBuilder()).buildEntityTeleportPacket(Math.abs(l.getUniqueId().hashCode()), getWitherLocation(all)), TabFeature.BOSSBAR);
-				} catch (Exception e) {
-					TAB.getInstance().getErrorManager().printError("Failed to create PacketPlayOutEntityTeleport", e);
-				}
-			}
-		}
-	}
-
-	@Override
-	public void unload() {
-		HandlerList.unregisterAll(this);
-	}
-	
-	/**
-	 * Respawning wither as respawn screen destroys all entities in client
-	 */
-	@EventHandler
-	public void onRespawn(PlayerRespawnEvent e) {
-		TAB.getInstance().getCPUManager().runMeasuredTask("processing PlayerRespawnEvent", TabFeature.BOSSBAR, UsageType.PLAYER_RESPAWN_EVENT, () -> mainFeature.detectBossBarsAndSend(TAB.getInstance().getPlayer(e.getPlayer().getUniqueId())));
-	}
-	
-	/**
-	 * Returns location where wither should be located based on where player is looking
-	 * @param p - player to get wither location for
-	 * @return location of wither
-	 */
-	public Location getWitherLocation(TabPlayer p) {
-		Player pl = (Player) p.getPlayer();
-		Location loc = pl.getEyeLocation().add(pl.getEyeLocation().getDirection().normalize().multiply(WITHER_DISTANCE));
-		if (loc.getY() < 1) loc.setY(1);
-		return loc;
-	}
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/ExpansionDownloader.java

@@ -1,99 +0,0 @@
-package me.neznamy.tab.platforms.bukkit.features;
-
-import java.io.File;
-import java.util.ConcurrentModificationException;
-import java.util.Set;
-
-import org.bukkit.Bukkit;
-import org.bukkit.plugin.java.JavaPlugin;
-
-import me.clip.placeholderapi.PlaceholderAPI;
-import me.neznamy.tab.shared.TAB;
-
-/**
- * Utility to execute /papi ecloud download <expansion> on expansions which are used but not installed
- * If an expansion was successfully downloaded (new expansion count is higher than previous in expansions folder),
- * /papi reload is executed.
- * Since this feature was added into the plugin amount of non-working placeholders caused by missing expansion went down rapidly.
- * I'm not sure why, must be a coinscidence.
- */
-public class ExpansionDownloader {
-
-	//the plugin to run bukkit tasks as
-	private JavaPlugin plugin;
-	
-	/**
-	 * Constructs new instance of the class with provided plugin instance
-	 * @param plugin - plugin to run bukkit tasks as
-	 */
-	public ExpansionDownloader(JavaPlugin plugin) {
-		this.plugin = plugin;
-	}
-
-	/**
-	 * Attempts to download all included expansions using /papi ecloud download <expansion> command and if something was successful /papi reload
-	 * @param expansions - list of expansions to attempt to download
-	 */
-	public void download(Set<String> expansions) {
-		//starting the task in the first tick just like PlaceholderAPI does to prevent downloading before PlaceholderAPI loads all expansions
-		Bukkit.getScheduler().runTaskLater(plugin, new Runnable() {
-
-			@Override
-			public void run() {
-				//starting the task asynchronously to not freeze the server with Thread.sleep
-				new Thread(new Runnable() {
-
-					@Override
-					public void run() {
-						try {
-							//initial delay to give PlaceholderAPI time to load
-							Thread.sleep(5000);
-							TAB.getInstance().debug("Used expansions: " + expansions.toString());
-							TAB.getInstance().debug("Registered expansions in PlaceholderAPI: " + PlaceholderAPI.getRegisteredIdentifiers());
-							expansions.removeAll(PlaceholderAPI.getRegisteredIdentifiers());
-							TAB.getInstance().debug("Expansions to install: " + expansions.toString());
-							if (!expansions.isEmpty()) {
-								File expansionsFolder = new File(Bukkit.getPluginManager().getPlugin("PlaceholderAPI").getDataFolder(), "expansions");
-								int oldExpansionDownloadedCount = expansionsFolder.listFiles().length;
-								for (String expansion : expansions) {
-									Bukkit.getConsoleSender().sendMessage("\u00a7d[TAB] Expansion \u00a7e" + expansion + "\u00a7d is used but not installed. Installing!");
-									runSyncCommand("papi ecloud download " + expansion);
-									Thread.sleep(5000);
-								}
-								if (expansionsFolder.listFiles().length > oldExpansionDownloadedCount) {
-									Bukkit.getConsoleSender().sendMessage("\u00a7d[TAB] Reloading PlaceholderAPI for the changes to take effect.");
-									runSyncCommand("papi reload");
-								}
-							}
-						} catch (InterruptedException | ConcurrentModificationException e) {
-							//fast shutdown probably
-						} catch (NoClassDefFoundError e){
-							//PAPI class not found, fast shutdown probably
-						} catch (Throwable e) {
-							TAB.getInstance().getErrorManager().printError("Failed to download PlaceholderAPI expansions. PlaceholderAPI version: " + Bukkit.getPluginManager().getPlugin("PlaceholderAPI").getDescription().getVersion(), e);
-						}
-					}
-				}).start();
-			}
-		}, 1);
-	}
-	
-	/**
-	 * Performs given command in the main thread
-	 * @param command - command to perform
-	 */
-	private void runSyncCommand(String command) {
-		//back to main thread as commands need to be ran in it
-		Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
-
-			@Override
-			public void run() {
-				try {
-					Bukkit.dispatchCommand(Bukkit.getConsoleSender(), command);
-				} catch (Exception e) {
-					//papi ecloud is disabled
-				}
-			}
-		});
-	}
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/PerWorldPlayerList.java

@@ -0,0 +1,98 @@
+package me.neznamy.tab.platforms.bukkit.features;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import me.neznamy.tab.api.TabFeature;
+import me.neznamy.tab.shared.TabConstants;
+import me.neznamy.tab.shared.TAB;
+
+/**
+ * Per-world-PlayerList feature handler
+ */
+@SuppressWarnings("deprecation")
+public class PerWorldPlayerList extends TabFeature implements Listener {
+	
+	//plugin instance
+	private final JavaPlugin plugin;
+	
+	//config options
+	private final boolean allowBypass = TAB.getInstance().getConfiguration().getConfig().getBoolean("per-world-playerlist.allow-bypass-permission", false);
+	private final List<String> ignoredWorlds = TAB.getInstance().getConfiguration().getConfig().getStringList("per-world-playerlist.ignore-effect-in-worlds", Arrays.asList("ignoredworld", "build"));
+	private final Map<String, List<String>> sharedWorlds = TAB.getInstance().getConfiguration().getConfig().getConfigurationSection("per-world-playerlist.shared-playerlist-world-groups");
+
+	/**
+	 * Constructs new instance with given parameters and loads config options
+	 * @param plugin - plugin instance
+	 */
+	public PerWorldPlayerList(JavaPlugin plugin) {
+		super("Per world PlayerList", null);
+		this.plugin = plugin;
+		TAB.getInstance().debug(String.format("Loaded PerWorldPlayerList feature with parameters allowBypass=%s, ignoredWorlds=%s, sharedWorlds=%s", allowBypass, ignoredWorlds, sharedWorlds));
+		Bukkit.getPluginManager().registerEvents(this, plugin);
+	}
+	
+	@Override
+	public void load(){
+		Bukkit.getScheduler().runTask(plugin, () -> Bukkit.getOnlinePlayers().forEach(this::checkPlayer));
+	}
+	
+	@Override
+	public void unload(){
+		for (Player p : Bukkit.getOnlinePlayers()) {
+			for (Player pl : Bukkit.getOnlinePlayers()) {
+				p.showPlayer(pl);
+			}
+		}
+		HandlerList.unregisterAll(this);
+	}
+	
+	@EventHandler
+	public void onJoin(PlayerJoinEvent e) {
+		long time = System.nanoTime();
+		checkPlayer(e.getPlayer());
+		TAB.getInstance().getCPUManager().addTime(getFeatureName(), TabConstants.CpuUsageCategory.PLAYER_JOIN, System.nanoTime()-time);
+	}
+	
+	@EventHandler
+	public void onWorldChange(PlayerChangedWorldEvent e) {
+		long time = System.nanoTime();
+		checkPlayer(e.getPlayer());
+		TAB.getInstance().getCPUManager().addTime(getFeatureName(), TabConstants.CpuUsageCategory.WORLD_SWITCH, System.nanoTime()-time);
+	}
+	
+	private void checkPlayer(Player p) {
+		for (Player all : Bukkit.getOnlinePlayers()){
+			if (all == p) continue;
+			if (!shouldSee(p, all) && p.canSee(all)) p.hidePlayer(all);
+			if (shouldSee(p, all) && !p.canSee(all)) p.showPlayer(all);
+			if (!shouldSee(all, p) && all.canSee(p)) all.hidePlayer(p);
+			if (shouldSee(all, p) && !all.canSee(p)) all.showPlayer(p);
+		}
+	}
+	
+	private boolean shouldSee(Player viewer, Player target) {
+		if (target == viewer) return true;
+		if ((allowBypass && viewer.hasPermission(TabConstants.Permission.PER_WORLD_PLAYERLIST_BYPASS)) || ignoredWorlds.contains(viewer.getWorld().getName())) return true;
+		String viewerWorldGroup = viewer.getWorld().getName() + "-default"; //preventing unwanted behavior when some group is called exactly like a world
+		String targetWorldGroup = target.getWorld().getName() + "-default";
+		for (Entry<String, List<String>> group : sharedWorlds.entrySet()) {
+			if (group.getValue() != null) {
+				if (group.getValue().contains(viewer.getWorld().getName())) viewerWorldGroup = group.getKey();
+				if (group.getValue().contains(target.getWorld().getName())) targetWorldGroup = group.getKey();
+			}
+		}
+		return viewerWorldGroup.equals(targetWorldGroup);
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/PerWorldPlayerlist.java

@@ -1,107 +0,0 @@
-package me.neznamy.tab.platforms.bukkit.features;
-
-import java.util.Arrays;
-import java.util.List;
-import java.util.Map;
-
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.HandlerList;
-import org.bukkit.event.Listener;
-import org.bukkit.event.player.PlayerChangedWorldEvent;
-import org.bukkit.event.player.PlayerJoinEvent;
-import org.bukkit.plugin.java.JavaPlugin;
-
-import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.cpu.UsageType;
-import me.neznamy.tab.shared.features.types.Loadable;
-
-/**
- * Per-world-playerlist feature handler
- */
-@SuppressWarnings("deprecation")
-public class PerWorldPlayerlist implements Loadable, Listener {
-	
-	//plugin instance
-	private JavaPlugin plugin;
-	
-	//config options
-	private boolean allowBypass;
-	private List<String> ignoredWorlds;
-	private Map<String, List<String>> sharedWorlds;
-
-	/**
-	 * Constructs new instance with given parameters and loads config options
-	 * @param plugin - plugin instance
-	 * @param tab - tab instance
-	 */
-	public PerWorldPlayerlist(JavaPlugin plugin, TAB tab) {
-		this.plugin = plugin;
-		allowBypass = tab.getConfiguration().config.getBoolean("per-world-playerlist.allow-bypass-permission", false);
-		ignoredWorlds = tab.getConfiguration().config.getStringList("per-world-playerlist.ignore-effect-in-worlds", Arrays.asList("ignoredworld", "build"));
-		sharedWorlds = tab.getConfiguration().config.getConfigurationSection("per-world-playerlist.shared-playerlist-world-groups");
-		for (String group : sharedWorlds.keySet()) {
-			if (sharedWorlds.get(group).size() == 1) {
-				tab.getErrorManager().startupWarn("World group \"" + group + "\" in per-world-playerlist only contain a single world (\"" + sharedWorlds.get(group).get(0) +
-						"\"), which has no effect and only makes config less readable. Delete the group entirely for a cleaner config.");
-			}
-		}
-		tab.debug(String.format("Loaded PerWorldPlayerlist feature with parameters allowBypass=%s, ignoredWorlds=%s, sharedWorlds=%s", allowBypass, ignoredWorlds, sharedWorlds));
-		Bukkit.getPluginManager().registerEvents(this, plugin);
-	}
-	
-	@Override
-	public void load(){
-		Bukkit.getScheduler().runTask(plugin, () -> Bukkit.getOnlinePlayers().forEach(p -> checkPlayer(p)));
-	}
-	
-	@Override
-	public void unload(){
-		for (Player p : Bukkit.getOnlinePlayers()) {
-			for (Player pl : Bukkit.getOnlinePlayers()) {
-				p.showPlayer(pl);
-			}
-		}
-		HandlerList.unregisterAll(this);
-	}
-	
-	@EventHandler
-	public void onJoin(PlayerJoinEvent e) {
-		long time = System.nanoTime();
-		checkPlayer(e.getPlayer());
-		TAB.getInstance().getCPUManager().addTime(TabFeature.PER_WORLD_PLAYERLIST, UsageType.PLAYER_JOIN_EVENT, System.nanoTime()-time);
-	}
-	
-	@EventHandler
-	public void onWorldChange(PlayerChangedWorldEvent e) {
-		long time = System.nanoTime();
-		checkPlayer(e.getPlayer());
-		TAB.getInstance().getCPUManager().addTime(TabFeature.PER_WORLD_PLAYERLIST, UsageType.WORLD_SWITCH_EVENT, System.nanoTime()-time);
-	}
-	
-	private void checkPlayer(Player p) {
-		for (Player all : Bukkit.getOnlinePlayers()){
-			if (all == p) continue;
-			if (!shouldSee(p, all) && p.canSee(all)) p.hidePlayer(all);
-			if (shouldSee(p, all) && !p.canSee(all)) p.showPlayer(all);
-			if (!shouldSee(all, p) && all.canSee(p)) all.hidePlayer(p);
-			if (shouldSee(all, p) && !all.canSee(p)) all.showPlayer(p);
-		}
-	}
-	
-	private boolean shouldSee(Player viewer, Player target) {
-		if (target == viewer) return true;
-		if ((allowBypass && viewer.hasPermission("tab.bypass")) || ignoredWorlds.contains(viewer.getWorld().getName())) return true;
-		String viewerWorldGroup = viewer.getWorld().getName() + "-default"; //preventing unwanted behavior when some group is called exactly like a world
-		String targetWorldGroup = target.getWorld().getName() + "-default";
-		for (String group : sharedWorlds.keySet()) {
-			if (sharedWorlds.get(group) != null) {
-				if (sharedWorlds.get(group).contains(viewer.getWorld().getName())) viewerWorldGroup = group;
-				if (sharedWorlds.get(group).contains(target.getWorld().getName())) targetWorldGroup = group;
-			}
-		}
-		return viewerWorldGroup.equals(targetWorldGroup);
-	}
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/PetFix.java

@@ -1,57 +1,56 @@
 package me.neznamy.tab.platforms.bukkit.features;
 
-import java.util.ArrayList;
+import java.util.ConcurrentModificationException;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import me.neznamy.tab.api.TabFeature;
 import me.neznamy.tab.api.TabPlayer;
 import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
 import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
 import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcherItem;
-import me.neznamy.tab.shared.ProtocolVersion;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.features.types.event.QuitEventListener;
-import me.neznamy.tab.shared.features.types.packet.RawPacketListener;
 
 /**
- * A feature to disable minecraft 1.9+ feature making tamed animals with custom names copy nametag properties of their owner
- * This is achieved by listening to entity spawn (<1.15) / entity metadata packets and removing owner field from the datawatcher list
+ * A feature to disable minecraft 1.9+ feature making tamed animals with custom names copy NameTag properties of their owner
+ * This is achieved by listening to entity spawn (<1.15) / entity metadata packets and removing owner field from the DataWatcher list
  * Since 1.16 this results in client sending entity use packet twice, so we must cancel the 2nd one to prevent double toggle
  */
-public class PetFix implements RawPacketListener, QuitEventListener {
+public class PetFix extends TabFeature {
 
-	//datawatcher position of pet owner field
-	private int PET_OWNER_POSITION = getPetOwnerPosition();
+	//nms storage
+	private final NMSStorage nms = NMSStorage.getInstance();
+
+	//DataWatcher position of pet owner field
+	private final int petOwnerPosition = getPetOwnerPosition();
 
 	//logger of last interacts to prevent feature not working on 1.16
-	private Map<String, Long> lastInteractFix = new HashMap<String, Long>();
-	
-	//nms storage
-	private NMSStorage nms;
-	
+	private final Map<String, Long> lastInteractFix = new HashMap<>();
+
 	/**
 	 * Constructs new instance with given parameter
-	 * @param nms
 	 */
-	public PetFix(NMSStorage nms) {
-		this.nms = nms;
+	public PetFix() {
+		super("Pet name fix", null);
 		TAB.getInstance().debug("Loaded PetFix feature");
 	}
-	
+
 	/**
 	 * Returns position of pet owner field based on server version
 	 * @return position of pet owner field based on server version
 	 */
 	private int getPetOwnerPosition() {
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 15) {
+		if (nms.getMinorVersion() >= 17) {
+			//1.17.x, 1.18.x
+			return 18;
+		} else if (nms.getMinorVersion() >= 15) {
 			//1.15.x, 1.16.x
 			return 17;
-		} else if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 14) {
+		} else if (nms.getMinorVersion() >= 14) {
 			//1.14.x
 			return 16;
-		} else if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 10) {
+		} else if (nms.getMinorVersion() >= 10) {
 			//1.10.x - 1.13.x
 			return 14;
 		} else {
@@ -59,58 +58,71 @@ public class PetFix implements RawPacketListener, QuitEventListener {
 			return 13;
 		}
 	}
-	
+
 	/**
 	 * Cancels a packet if previous one arrived with no delay to prevent double toggle on 1.16
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
 	 */
 	@Override
-	public Object onPacketReceive(TabPlayer sender, Object packet) throws Throwable {
+	public boolean onPacketReceive(TabPlayer sender, Object packet) throws ReflectiveOperationException {
 		if (nms.PacketPlayInUseEntity.isInstance(packet)) {
 			if (lastInteractFix.containsKey(sender.getName()) && (System.currentTimeMillis() - lastInteractFix.get(sender.getName()) < 5)) {
 				//last interact packet was sent right now, cancelling to prevent double-toggle due to this feature enabled
-				return null;
+				return true;
 			}
-			if (nms.PacketPlayInUseEntity_ACTION.get(packet).toString().equals("INTERACT")) {
+			if (isInteract(nms.PacketPlayInUseEntity_ACTION.get(packet))) {
 				//this is the first packet, saving player so the next packet can be cancelled
 				lastInteractFix.put(sender.getName(), System.currentTimeMillis());
 			}
 		}
-		return packet;
+		return false;
 	}
-	
-	/**
-	 * Removes pet owner field from datawatcher
-	 */
-	@SuppressWarnings("unchecked")
-	@Override
-	public void onPacketSend(TabPlayer receiver, Object packet) throws Throwable {
-		if (nms.PacketPlayOutEntityMetadata.isInstance(packet)) {
-			List<Object> items = (List<Object>) nms.PacketPlayOutEntityMetadata_LIST.get(packet);
-			if (items == null) return;
-			List<Object> newList = new ArrayList<Object>();
-			for (Object item : items) {
-				if (nms.DataWatcherObject_SLOT.getInt(nms.DataWatcherItem_TYPE.get(item)) == PET_OWNER_POSITION) {
-					Object value = nms.DataWatcherItem_VALUE.get(item);
-					if (value instanceof java.util.Optional || value instanceof com.google.common.base.Optional) continue;
-				}
-				newList.add(item);
-			}
-			nms.PacketPlayOutEntityMetadata_LIST.set(packet, newList);
-		}
-		//<1.15
-		if (nms.PacketPlayOutSpawnEntityLiving.isInstance(packet) && nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER != null) {
-			DataWatcher watcher = DataWatcher.fromNMS(nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER.get(packet));
-			DataWatcherItem petOwner = watcher.getItem(PET_OWNER_POSITION);
-			if (petOwner != null && (petOwner.value instanceof java.util.Optional || petOwner.value instanceof com.google.common.base.Optional)) {
-				watcher.removeValue(PET_OWNER_POSITION);
-				nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER.set(packet, watcher.toNMS());
-			}
+
+	private boolean isInteract(Object action) {
+		if (nms.getMinorVersion() >= 17) {
+			return nms.PacketPlayInUseEntity$d.isInstance(action);
+		} else {
+			return action.toString().equals("INTERACT");
 		}
 	}
 
+	/**
+	 * Removes pet owner field from DataWatcher
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
+	 */
+	@SuppressWarnings("unchecked")
 	@Override
-	public TabFeature getFeatureType() {
-		return TabFeature.PET_NAME_FIX;
+	public void onPacketSend(TabPlayer receiver, Object packet) throws ReflectiveOperationException {
+		if (nms.PacketPlayOutEntityMetadata.isInstance(packet)) {
+			Object removedEntry = null;
+			List<Object> items = (List<Object>) nms.PacketPlayOutEntityMetadata_LIST.get(packet);
+			if (items == null) return;
+			try {
+				for (Object item : items) {
+					if (item == null) continue;
+					if (nms.DataWatcherObject_SLOT.getInt(nms.DataWatcherItem_TYPE.get(item)) == petOwnerPosition) {
+						Object value = nms.DataWatcherItem_VALUE.get(item);
+						if (value instanceof java.util.Optional || value instanceof com.google.common.base.Optional) {
+							removedEntry = item;
+						}
+					}
+				}
+			} catch (ConcurrentModificationException e) {
+				//no idea how can this list change in another thread since it's created for the packet but whatever, try again
+				onPacketSend(receiver, packet);
+			}
+			if (removedEntry != null) items.remove(removedEntry);
+		} else if (nms.PacketPlayOutSpawnEntityLiving.isInstance(packet) && nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER != null) {
+			//<1.15
+			DataWatcher watcher = DataWatcher.fromNMS(nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER.get(packet));
+			DataWatcherItem petOwner = watcher.getItem(petOwnerPosition);
+			if (petOwner != null && (petOwner.getValue() instanceof java.util.Optional || petOwner.getValue() instanceof com.google.common.base.Optional)) {
+				watcher.removeValue(petOwnerPosition);
+				nms.setField(packet, nms.PacketPlayOutSpawnEntityLiving_DATAWATCHER, watcher.toNMS());
+			}
+		}
 	}
 
 	/**

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/TabExpansion.java

@@ -1,16 +1,19 @@
 package me.neznamy.tab.platforms.bukkit.features;
 
-import java.util.Map;
-
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
 
+import me.clip.placeholderapi.PlaceholderAPI;
 import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+import me.neznamy.tab.api.Property;
+import me.neznamy.tab.api.TabAPI;
 import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.platforms.bukkit.BukkitPlatform;
-import me.neznamy.tab.shared.Property;
+import me.neznamy.tab.api.bossbar.BossBarManager;
+import me.neznamy.tab.api.scoreboard.Scoreboard;
+import me.neznamy.tab.api.scoreboard.ScoreboardManager;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.placeholders.Placeholder;
+import me.neznamy.tab.shared.features.scoreboard.ScoreboardManagerImpl;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * TAB's expansion for PlaceholderAPI
@@ -18,8 +21,7 @@ import me.neznamy.tab.shared.placeholders.Placeholder;
 public class TabExpansion extends PlaceholderExpansion {
 
 	//plugin to take plugin.yml data from
-	private JavaPlugin plugin;
-	
+	private final JavaPlugin plugin;
 	
 	/**
 	 * Constructs new instance of the class and registers it
@@ -41,43 +43,65 @@ public class TabExpansion extends PlaceholderExpansion {
 	}
 
 	@Override
-	public String getAuthor(){
+	public @NotNull String getAuthor(){
 		return plugin.getDescription().getAuthors().toString();
 	}
 
 	@Override
-	public String getIdentifier(){
+	public @NotNull String getIdentifier(){
 		return "tab";
 	}
 
 	@Override
-	public String getVersion(){
+	public @NotNull String getVersion(){
 		return plugin.getDescription().getVersion();
 	}
 
 	@Override
-	public String onPlaceholderRequest(Player player, String identifier){
+	public String onPlaceholderRequest(Player player, @NotNull String identifier){
 		if (player == null) return "";
 		TabPlayer p = TAB.getInstance().getPlayer(player.getUniqueId());
-		if (identifier.equals("scoreboard_visible")) {
-			return translate(p.isScoreboardVisible());
+		if ("scoreboard_visible".equals(identifier)) {
+			return translate(hasScoreboardVisible(p));
 		}
-		if (identifier.equals("bossbar_visible")) {
-			return translate(p.hasBossbarVisible());
+		if ("scoreboard_name".equals(identifier)) {
+			return getActiveScoreboard(p);
 		}
-		if (identifier.equals("ntpreview")) {
+		if ("bossbar_visible".equals(identifier)) {
+			return translate(hasBossBarVisible(p));
+		}
+		if ("ntpreview".equals(identifier)) {
 			return translate(p.isPreviewingNametag());
 		}
 		if (identifier.startsWith("replace_")) {
 			return findReplacement("%" + identifier.substring(8) + "%", player);
 		}
 		if (identifier.startsWith("placeholder_")) {
-			//using Property function for fast & easy handling of nested placeholders and different placeholder types
-			return new Property(p, "%" + identifier.substring(12) + "%").get();
+			return TAB.getInstance().getPlaceholderManager().getPlaceholder("%" + identifier.substring(12) + "%").getLastValue(p);
 		}
 		return getProperty(identifier, p);
 	}
 	
+	private boolean hasBossBarVisible(TabPlayer p) {
+		BossBarManager boss = (BossBarManager) TAB.getInstance().getFeatureManager().getFeature("bossbar");
+		if (boss == null) return false;
+		return boss.hasBossBarVisible(p);
+	}
+	
+	private boolean hasScoreboardVisible(TabPlayer p) {
+		ScoreboardManager scoreboard = (ScoreboardManager) TAB.getInstance().getFeatureManager().getFeature("scoreboard");
+		if (scoreboard == null) return false;
+		return scoreboard.hasScoreboardVisible(p);
+	}
+	
+	private String getActiveScoreboard(TabPlayer p) {
+		ScoreboardManagerImpl sb = (ScoreboardManagerImpl) TabAPI.getInstance().getScoreboardManager();
+		if (sb == null) return "";
+		Scoreboard active = sb.getActiveScoreboards().get(p);
+		if (active == null) return "";
+		return active.getName();
+	}
+	
 	private String translate(boolean b) {
 		return b ? "Enabled" : "Disabled";
 	}
@@ -89,10 +113,8 @@ public class TabExpansion extends PlaceholderExpansion {
 	 * @return replacement
 	 */
 	private String findReplacement(String placeholder, Player player) {
-		if (!TAB.getInstance().isPremium()) return "Placeholder output replacements require premium version to work";
-		String output = ((BukkitPlatform) TAB.getInstance().getPlatform()).setPlaceholders(player, placeholder);
-		Map<Object, String> replacements = TAB.getInstance().getConfiguration().premiumconfig.getConfigurationSection("placeholder-output-replacements." + placeholder);
-		return Placeholder.findReplacement(replacements, output).replace("%value%", output);
+		String output = PlaceholderAPI.setPlaceholders(player, placeholder);
+		return TAB.getInstance().getPlaceholderManager().findReplacement(placeholder, output).replace("%value%", output);
 	}
 	
 	/**

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/WitherBossBar.java

@@ -0,0 +1,72 @@
+package me.neznamy.tab.platforms.bukkit.features;
+
+import java.util.Collections;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerRespawnEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.api.bossbar.BossBar;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutEntityTeleport;
+import me.neznamy.tab.shared.TabConstants;
+import me.neznamy.tab.shared.TAB;
+import me.neznamy.tab.shared.features.bossbar.BossBarManagerImpl;
+
+/**
+ * An additional class with additional code for <1.9 servers due to an entity being required
+ */
+public class WitherBossBar extends BossBarManagerImpl implements Listener {
+
+	//distance of wither in blocks
+	private static final int WITHER_DISTANCE = 60;
+	
+	/**
+	 * Constructs a new instance of the class
+	 * @param plugin - plugin instance
+	 */
+	public WitherBossBar(JavaPlugin plugin) {
+		Bukkit.getPluginManager().registerEvents(this, plugin);
+		//when MC is on fullscreen, BossBar disappears after 1 second of not being seen
+		//when in a small window, it's about 100ms
+		TAB.getInstance().getPlaceholderManager().registerPlayerPlaceholder("%location%", 100, p -> ((Player)p.getPlayer()).getLocation());
+		addUsedPlaceholders(Collections.singletonList("%location%"));
+	}
+	
+	@Override
+	public void load() {
+		super.load();
+		for (TabPlayer p : TAB.getInstance().getOnlinePlayers()) {
+			refresh(p, false);
+		}
+	}
+	
+	@Override
+	public void refresh(TabPlayer p, boolean force) {
+		for (BossBar line : getRegisteredBossBars().values()) {
+			if (p.getVersion().getMinorVersion() > 8) continue; //sending VV packets to those
+			Location loc = ((Player) p.getPlayer()).getEyeLocation().add(((Player) p.getPlayer()).getEyeLocation().getDirection().normalize().multiply(WITHER_DISTANCE));
+			if (loc.getY() < 1) loc.setY(1);
+			p.sendCustomPacket(new PacketPlayOutEntityTeleport(line.getUniqueId().hashCode(), loc), TabConstants.PacketCategory.BOSSBAR_WITHER_TELEPORT);
+		}
+	}
+	
+	@Override
+	public void unload() {
+		super.unload();
+		HandlerList.unregisterAll(this);
+	}
+	
+	/**
+	 * Respawning wither as respawn screen destroys all entities in client
+	 */
+	@EventHandler
+	public void onRespawn(PlayerRespawnEvent e) {
+		TAB.getInstance().getCPUManager().runMeasuredTask("processing PlayerRespawnEvent", this, TabConstants.CpuUsageCategory.PLAYER_RESPAWN, () -> detectBossBarsAndSend(TAB.getInstance().getPlayer(e.getPlayer().getUniqueId())));
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/BukkitArmorStand.java

@@ -1,49 +1,53 @@
 package me.neznamy.tab.platforms.bukkit.features.unlimitedtags;
 
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Set;
 import java.util.UUID;
 
-import org.bukkit.GameMode;
 import org.bukkit.Location;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
 import org.bukkit.entity.Pose;
-import org.bukkit.potion.PotionEffectType;
 
 import me.neznamy.tab.api.ArmorStand;
+import me.neznamy.tab.api.Property;
 import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.platforms.bukkit.BukkitPacketBuilder;
-import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.api.chat.EnumChatFormat;
+import me.neznamy.tab.api.chat.IChatBaseComponent;
+import me.neznamy.tab.api.protocol.TabPacket;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutEntityDestroy;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutEntityMetadata;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutEntityTeleport;
+import me.neznamy.tab.platforms.bukkit.nms.PacketPlayOutSpawnEntityLiving;
 import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
-import me.neznamy.tab.shared.Property;
-import me.neznamy.tab.shared.ProtocolVersion;
+import me.neznamy.tab.shared.TabConstants;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.cpu.UsageType;
-import me.neznamy.tab.shared.packets.IChatBaseComponent;
 
 /**
  * A class representing an armor stand attached to a player (if the feature is enabled)
  */
 public class BukkitArmorStand implements ArmorStand {
 
+	private final boolean alwaysVisible = TAB.getInstance().getConfiguration().isArmorStandsAlwaysVisible();
+	//entity id counter to pick unique entity IDs
+	private static int idCounter = 2000000000;
+
+	//NameTag feature
+	private final NameTagX manager = (NameTagX) TAB.getInstance().getFeatureManager().getFeature("nametagx");
+
 	//owner of the armor stand
-	private TabPlayer owner;
+	private final TabPlayer owner;
 
 	//instance of Bukkit player
-	private Player player;
+	private final Player player;
 
 	//offset in blocks, 0 for original height
 	private double yOffset;
 
 	//entity ID of this armor stand
-	private int entityId;
+	private final int entityId = idCounter++;
 
 	//unique ID of this armor stand
-	private UUID uuid = UUID.randomUUID();
+	private final UUID uuid = UUID.randomUUID();
 
 	//sneaking flag of armor stands
 	private boolean sneaking;
@@ -51,17 +55,14 @@ public class BukkitArmorStand implements ArmorStand {
 	//armor stand visibility
 	private boolean visible;
 
-	//list of players in entity tracking range (48 blocks)
-	private Set<TabPlayer> nearbyPlayers = Collections.synchronizedSet(new HashSet<TabPlayer>());
-
 	//property dedicated to this armor stand
-	private Property property;
+	private final Property property;
 
 	//if offset is static or dynamic based on other armor stands
-	private boolean staticOffset;
+	private final boolean staticOffset;
 
-	//if marker tag should be used for 1.8.x clients
-	private boolean markerFor18x;
+	//entity destroy packet
+	private final PacketPlayOutEntityDestroy destroyPacket = new PacketPlayOutEntityDestroy(entityId);
 
 	/**
 	 * Constructs new instance with given parameters
@@ -70,14 +71,12 @@ public class BukkitArmorStand implements ArmorStand {
 	 * @param yOffset - offset in blocks
 	 * @param staticOffset - if offset is static or not
 	 */
-	public BukkitArmorStand(int entityId, TabPlayer owner, Property property, double yOffset, boolean staticOffset) {
-		this.entityId = entityId;
+	public BukkitArmorStand(TabPlayer owner, Property property, double yOffset, boolean staticOffset) {
 		this.owner = owner;
 		this.staticOffset = staticOffset;
 		player = (Player) owner.getPlayer();
 		this.yOffset = yOffset;
 		this.property = property;
-		markerFor18x = ((NameTagX)TAB.getInstance().getFeatureManager().getFeature("nametagx")).markerFor18x;
 		visible = getVisibility();
 	}
 
@@ -106,192 +105,117 @@ public class BukkitArmorStand implements ArmorStand {
 	public void setOffset(double offset) {
 		if (yOffset == offset) return;
 		yOffset = offset;
-		for (TabPlayer all : getNearbyPlayers()) {
-			all.sendPacket(getTeleportPacket(all), TabFeature.NAMETAGX);
-		}
-	}
-
-	/**
-	 * Returns list of packets to send to make armor stand spawn with metadata
-	 * @param viewer - viewer to apply relational placeholders for
-	 * @param addToRegistered - if player should be added to registered or not
-	 * @return List of packets that spawn the armor stand
-	 */
-	public Object[] getSpawnPackets(TabPlayer viewer) {
-		visible = getVisibility();
-		nearbyPlayers.add(viewer);
-		DataWatcher dataWatcher = createDataWatcher(property.getFormat(viewer), viewer);
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 15) {
-			return new Object[] {
-					getSpawnPacket(getArmorStandLocationFor(viewer), null),
-					getMetadataPacket(dataWatcher)
-			};
-		} else {
-			return new Object[] {
-					getSpawnPacket(getArmorStandLocationFor(viewer), dataWatcher)
-			};
+		for (TabPlayer all : owner.getArmorStandManager().getNearbyPlayers()) {
+			all.sendCustomPacket(getTeleportPacket(all), TabConstants.PacketCategory.UNLIMITED_NAMETAGS_OFFSET_CHANGE);
 		}
 	}
 
 	@Override
 	public void spawn(TabPlayer viewer) {
-		for (Object packet : getSpawnPackets(viewer)) {
-			viewer.sendPacket(packet, TabFeature.NAMETAGX);
+		for (TabPacket packet : getSpawnPackets(viewer)) {
+			viewer.sendCustomPacket(packet, TabConstants.PacketCategory.UNLIMITED_NAMETAGS_SPAWN);
 		}
 	}
 
-	/**
-	 * Returns location where armor stand should be for specified viewer
-	 * @param viewer - player to get location for
-	 * @return location of armor stand
-	 */
-	private Location getArmorStandLocationFor(TabPlayer viewer) {
-		return viewer.getVersion().getMinorVersion() == 8 && !markerFor18x ? getLocation().clone().add(0,-2,0) : getLocation();
+	@Override
+	public void destroy() {
+		for (TabPlayer all : TAB.getInstance().getOnlinePlayers()) all.sendCustomPacket(destroyPacket, TabConstants.PacketCategory.UNLIMITED_NAMETAGS_DESPAWN);
 	}
-
+	
 	@Override
 	public void destroy(TabPlayer viewer) {
-		nearbyPlayers.remove(viewer);
-		viewer.sendPacket(getDestroyPacket(), TabFeature.NAMETAGX);
+		viewer.sendCustomPacket(destroyPacket, TabConstants.PacketCategory.UNLIMITED_NAMETAGS_DESPAWN);
 	}
 
 	@Override
 	public void teleport() {
-		for (TabPlayer all : getNearbyPlayers()) {
-			all.sendPacket(getTeleportPacket(all), TabFeature.NAMETAGX);
+		for (TabPlayer all : owner.getArmorStandManager().getNearbyPlayers()) {
+			all.sendCustomPacket(getTeleportPacket(all), TabConstants.PacketCategory.UNLIMITED_NAMETAGS_TELEPORT);
 		}
 	}
 
 	@Override
 	public void teleport(TabPlayer viewer) {
-		viewer.sendPacket(getTeleportPacket(viewer), TabFeature.NAMETAGX);
+		if (!owner.getArmorStandManager().isNearby(viewer) && viewer != owner) {
+			owner.getArmorStandManager().spawn(viewer);
+		} else {
+			viewer.sendCustomPacket(getTeleportPacket(viewer), TabConstants.PacketCategory.UNLIMITED_NAMETAGS_TELEPORT);
+		}
 	}
 
 	@Override
 	public void sneak(boolean sneaking) {
 		if (this.sneaking == sneaking) return; //idk
 		this.sneaking = sneaking;
-		for (TabPlayer viewer : getNearbyPlayers()) {
-			if (viewer.getVersion().getMinorVersion() == 14 && !TAB.getInstance().getConfiguration().armorStandsAlwaysVisible) {
-				//1.14.x client sided bug, despawning completely
+		for (TabPlayer viewer : owner.getArmorStandManager().getNearbyPlayers()) {
+			if (viewer.getVersion().getMinorVersion() == 14 && !alwaysVisible) {
+				//1.14.x client sided bug, de-spawning completely
 				if (sneaking) {
-					viewer.sendPacket(getDestroyPacket(), TabFeature.NAMETAGX);
+					viewer.sendCustomPacket(destroyPacket, TabConstants.PacketCategory.UNLIMITED_NAMETAGS_SNEAK);
 				} else {
 					spawn(viewer);
 				}
 			} else {
 				//respawning so there's no animation and it's instant
-				viewer.sendPacket(getDestroyPacket(), TabFeature.NAMETAGX);
-				Runnable spawn = () -> spawn(viewer);
-				if (viewer.getVersion().getMinorVersion() == 8) {
-					//1.8.0 client sided bug
-					TAB.getInstance().getCPUManager().runTaskLater(50, "compensating for 1.8.0 bugs", TabFeature.NAMETAGX, UsageType.v1_8_0_BUG_COMPENSATION, spawn);
-				} else {
-					spawn.run();
-				}
+				respawn(viewer);
 			}
 		}
 	}
 
-	@Override
-	public void destroy() {
-		for (TabPlayer all : TAB.getInstance().getPlayers()) all.sendPacket(getDestroyPacket(), TabFeature.NAMETAGX);
-		nearbyPlayers.clear();
-	}
-
 	@Override
 	public void updateVisibility(boolean force) {
-		boolean visible = getVisibility();
-		if (this.visible != visible || force) {
-			this.visible = visible;
+		boolean visibility = getVisibility();
+		if (visible != visibility || force) {
+			visible = visibility;
 			updateMetadata();
 		}
 	}
-	
+
+	@Override
+	public int getEntityId() {
+		return entityId;
+	}
 
 	/**
 	 * Returns teleport packet for specified viewer
 	 * @param viewer - player to get location for
 	 * @return teleport packet
 	 */
-	private Object getTeleportPacket(TabPlayer viewer) {
-		try {
-			return ((BukkitPacketBuilder)TAB.getInstance().getPacketBuilder()).buildEntityTeleportPacket(entityId, getArmorStandLocationFor(viewer));
-		} catch (Exception e) {
-			return TAB.getInstance().getErrorManager().printError(null, "Failed to create PacketPlayOutEntityTeleport", e);
-		}
-	}
-	
-	/**
-	 * Returns destroy packet
-	 * @return destroy packet
-	 */
-	private Object getDestroyPacket() {
-		try {
-			return ((BukkitPacketBuilder)TAB.getInstance().getPacketBuilder()).buildEntityDestroyPacket(entityId);
-		} catch (Exception e) {
-			return TAB.getInstance().getErrorManager().printError(null, "Failed to create PacketPlayOutEntityDestroy", e);
-		}
-	}
-	
-	/**
-	 * Returns metadata packet with specified datawatcher
-	 * @param dataWatcher - datawatcher
-	 * @return metadata packet
-	 */
-	private Object getMetadataPacket(DataWatcher dataWatcher) {
-		try {
-			return ((BukkitPacketBuilder)TAB.getInstance().getPacketBuilder()).buildEntityMetadataPacket(entityId, dataWatcher);
-		} catch (Exception e) {
-			return TAB.getInstance().getErrorManager().printError(null, "Failed to create PacketPlayOutEntityMetadata", e);
-		}
-	}
-	
-	/**
-	 * Returns spawn packet with specified parameters
-	 * @param loc - location to spawn at
-	 * @param dataWatcher - datawatcher
-	 * @return spawn packet
-	 */
-	private Object getSpawnPacket(Location loc, DataWatcher dataWatcher) {
-		try {
-			return ((BukkitPacketBuilder)TAB.getInstance().getPacketBuilder()).buildEntitySpawnPacket(entityId, uuid, EntityType.ARMOR_STAND, loc, dataWatcher);
-		} catch (Exception e) {
-			return TAB.getInstance().getErrorManager().printError(null, "Failed to create PacketPlayOutSpawnEntityLiving", e);
-		}
+	public PacketPlayOutEntityTeleport getTeleportPacket(TabPlayer viewer) {
+		return new PacketPlayOutEntityTeleport(entityId, getArmorStandLocationFor(viewer));
 	}
 
 	/**
 	 * Updates armor stand's metadata
 	 */
-	private void updateMetadata() {
-		for (TabPlayer viewer : getNearbyPlayers()) {
-			viewer.sendPacket(getMetadataPacket(createDataWatcher(property.getFormat(viewer), viewer)), TabFeature.NAMETAGX);
+	public void updateMetadata() {
+		for (TabPlayer viewer : owner.getArmorStandManager().getNearbyPlayers()) {
+			viewer.sendCustomPacket(new PacketPlayOutEntityMetadata(entityId, createDataWatcher(property.getFormat(viewer), viewer)), TabConstants.PacketCategory.UNLIMITED_NAMETAGS_METADATA);
 		}
 	}
 
 	/**
 	 * Returns general visibility rule for everyone with limited info
-	 * @return true if should be visible, false if not
+	 * @return true if armor stand should be visible, false if not
 	 */
-	private boolean getVisibility() {
-		if (((BukkitTabPlayer)owner).isDisguised() || (((NameTagX)TAB.getInstance().getFeatureManager().getFeature("nametagx")).playersOnBoats.contains(owner))) return false;
-		if (TAB.getInstance().getConfiguration().armorStandsAlwaysVisible) return true;
-		return !player.hasPotionEffect(PotionEffectType.INVISIBILITY) && player.getGameMode() != GameMode.SPECTATOR && !owner.hasHiddenNametag() && property.get().length() > 0;
+	public boolean getVisibility() {
+		if (owner.isDisguised() || manager.getVehicleManager().isOnBoat(owner)) return false;
+		if (alwaysVisible) return true;
+		return !owner.hasInvisibilityPotion() && owner.getGamemode() != 3 && !manager.hasHiddenNametag(owner) && property.get().length() > 0;
 	}
 
 	/**
 	 * Returns general location where armor stand should be at time of calling
 	 * @return Location where armor stand should be for everyone
 	 */
-	private Location getLocation() {
+	public Location getLocation() {
 		double x = player.getLocation().getX();
 		double y = getY() + yOffset + 2;
 		double z = player.getLocation().getZ();
 		if (player.isSleeping()) {
 			y -= 1.76;
 		} else {
-			if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 9) {
+			if (TAB.getInstance().getServerVersion().getMinorVersion() >= 9) {
 				y -= (sneaking ? 0.45 : 0.18);
 			} else {
 				y -= (sneaking ? 0.30 : 0.18);
@@ -304,52 +228,42 @@ public class BukkitArmorStand implements ArmorStand {
 	 * Returns Y where player is based on player's vehicle due to bukkit API bug
 	 * @return correct player's Y
 	 */
-	private double getY() {
-		//1.14+ bukkit api bug
+	protected double getY() {
+		//1.14+ server sided bug
 		Entity vehicle = player.getVehicle();
 		if (vehicle != null) {
-			if (vehicle.getType() == EntityType.HORSE) {
+			if (vehicle.getType().toString().contains("HORSE")) { //covering all 3 horse types
 				return vehicle.getLocation().getY() + 0.85;
 			}
-			if (vehicle.getType().toString().equals("DONKEY")) {
+			if (vehicle.getType().toString().equals("DONKEY")) { //1.11+
 				return vehicle.getLocation().getY() + 0.525;
 			}
 			if (vehicle.getType() == EntityType.PIG) {
 				return vehicle.getLocation().getY() + 0.325;
 			}
-			if (vehicle.getType().toString().equals("STRIDER")) { //preventing errors on <1.16
+			if (vehicle.getType().toString().equals("STRIDER")) { //1.16+
 				return vehicle.getLocation().getY() + 1.15;
 			}
 		}
-        //1.13+ swimming or 1.9+ flying with elytra
-        if (isSwimming() || (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 9 && player.isGliding())) {
-            return player.getLocation().getY()-1.22;
-        }
+		//1.13+ swimming or 1.9+ flying with elytra
+		if (isSwimming() || (TAB.getInstance().getServerVersion().getMinorVersion() >= 9 && player.isGliding())) {
+			return player.getLocation().getY()-1.22;
+		}
 		return player.getLocation().getY();
 	}
-	
+
 	private boolean isSwimming() {
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 14 && player.getPose() == Pose.SWIMMING) return true;
-		return ProtocolVersion.SERVER_VERSION.getMinorVersion() == 13 && player.isSwimming();
-	}
-
-	@Override
-	public int getEntityId() {
-		return entityId;
-	}
-
-	@Override
-	public void removeFromRegistered(TabPlayer viewer) {
-		nearbyPlayers.remove(viewer);
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 14 && player.getPose() == Pose.SWIMMING) return true;
+		return TAB.getInstance().getServerVersion().getMinorVersion() == 13 && player.isSwimming();
 	}
 
 	/**
 	 * Creates data watcher with specified display name for viewer
 	 * @param displayName - armor stand name
 	 * @param viewer - player to apply checks against
-	 * @return datawatcher for viewer
+	 * @return DataWatcher for viewer
 	 */
-	private DataWatcher createDataWatcher(String displayName, TabPlayer viewer) {
+	public DataWatcher createDataWatcher(String displayName, TabPlayer viewer) {
 		DataWatcher datawatcher = new DataWatcher();
 
 		byte flag = 32; //invisible
@@ -357,31 +271,69 @@ public class BukkitArmorStand implements ArmorStand {
 		datawatcher.helper().setEntityFlags(flag);
 		datawatcher.helper().setCustomName(displayName, viewer.getVersion());
 
-		boolean visible;
-		if (isNameVisiblyEmpty(displayName) || !((Player) viewer.getPlayer()).canSee(player) || owner.hasHiddenNametag(viewer.getUniqueId())) {
-			visible = false;
+		boolean visibility;
+		if (isNameVisiblyEmpty(displayName) || !((Player) viewer.getPlayer()).canSee(player) || manager.hasHiddenNametag(owner, viewer)) {
+			visibility = false;
 		} else {
-			visible = this.visible;
+			visibility = visible;
 		}
-		datawatcher.helper().setCustomNameVisible(visible);
+		datawatcher.helper().setCustomNameVisible(visibility);
 
-		if (viewer.getVersion().getMinorVersion() > 8 || markerFor18x) datawatcher.helper().setArmorStandFlags((byte)16);
+		if (viewer.getVersion().getMinorVersion() > 8 || manager.isMarkerFor18x()) datawatcher.helper().setArmorStandFlags((byte)16);
 		return datawatcher;
 	}
 
-	@Override
-	public Set<TabPlayer> getNearbyPlayers(){
-		synchronized (nearbyPlayers) {
-			return new HashSet<TabPlayer>(nearbyPlayers);
-		}
-	}
-
 	/**
 	 * Returns true if display name is in fact empty, for example only containing color codes
 	 * @param displayName - string to check
 	 * @return true if it's empty, false if not
 	 */
 	private boolean isNameVisiblyEmpty(String displayName) {
-		return IChatBaseComponent.fromColoredText(displayName).toRawText().replace(" ", "").length() == 0;
+		if (displayName.length() == 0) return true;
+		if (!displayName.startsWith(EnumChatFormat.COLOR_STRING) && !displayName.startsWith("&") && !displayName.startsWith("#")) return false;
+		String text = IChatBaseComponent.fromColoredText(displayName).toRawText();
+		if (text.contains(" ")) text = text.replace(" ", "");
+		return text.length() == 0;
+	}
+
+	/**
+	 * Returns list of packets to send to make armor stand spawn with metadata
+	 * @param viewer - viewer to apply relational placeholders for
+	 * @return List of packets that spawn the armor stand
+	 */
+	public TabPacket[] getSpawnPackets(TabPlayer viewer) {
+		visible = getVisibility();
+		DataWatcher dataWatcher = createDataWatcher(property.getFormat(viewer), viewer);
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 15) {
+			return new TabPacket[] {
+					new PacketPlayOutSpawnEntityLiving(entityId, uuid, EntityType.ARMOR_STAND, getArmorStandLocationFor(viewer), null),
+					new PacketPlayOutEntityMetadata(entityId, dataWatcher)
+			};
+		} else {
+			return new TabPacket[] {
+					new PacketPlayOutSpawnEntityLiving(entityId, uuid, EntityType.ARMOR_STAND, getArmorStandLocationFor(viewer), dataWatcher),
+			};
+		}
+	}
+
+	/**
+	 * Returns location where armor stand should be for specified viewer
+	 * @param viewer - player to get location for
+	 * @return location of armor stand
+	 */
+	public Location getArmorStandLocationFor(TabPlayer viewer) {
+		return viewer.getVersion().getMinorVersion() == 8 && !manager.isMarkerFor18x() ? getLocation().clone().add(0,-2,0) : getLocation();
+	}
+
+	@Override
+	public void respawn(TabPlayer viewer) {
+		viewer.sendCustomPacket(destroyPacket, TabConstants.PacketCategory.UNLIMITED_NAMETAGS_DESPAWN);
+		Runnable spawn = () -> spawn(viewer);
+		if (viewer.getVersion().getMinorVersion() == 8) {
+			//1.8.0 client sided bug
+			TAB.getInstance().getCPUManager().runTaskLater(50, "compensating for 1.8.0 bugs", manager, TabConstants.CpuUsageCategory.V1_8_0_BUG_COMPENSATION, spawn);
+		} else {
+			spawn.run();
+		}
 	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/EventListener.java

@@ -3,39 +3,39 @@ package me.neznamy.tab.platforms.bukkit.features.unlimitedtags;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
 import org.bukkit.event.player.PlayerRespawnEvent;
 import org.bukkit.event.player.PlayerToggleSneakEvent;
 
 import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.shared.TabConstants;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.cpu.UsageType;
 
 /**
  * The event listener part for securing proper functionality of armor stands
  */
 public class EventListener implements Listener {
 	
-	//the nametag feature handler
-	private NameTagX feature;
+	//the NameTag feature handler
+	private final NameTagX feature;
 
 	/**
 	 * Constructs new instance with given parameters
-	 * @param feature - nametagx feature handler
+	 * @param feature - NameTag feature handler
 	 */
 	public EventListener(NameTagX feature) {
 		this.feature = feature;
 	}
 	
 	/**
-	 * Sneak event listener to despawn & spawn armor stands to skip animation
+	 * Sneak event listener to de-spawn & spawn armor stands to skip animation
 	 * @param e - sneak event
 	 */
 	@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
 	public void onSneak(PlayerToggleSneakEvent e) {
 		TabPlayer p = TAB.getInstance().getPlayer(e.getPlayer().getUniqueId());
-		if (p == null || !p.isLoaded() || feature.isDisabledWorld(p.getWorldName()) || feature.isDisabledWorld(feature.disabledUnlimitedWorlds, p.getWorldName())) return;
-		TAB.getInstance().getCPUManager().runMeasuredTask("processing PlayerToggleSneakEvent", TabFeature.NAMETAGX, UsageType.PLAYER_TOGGLE_SNEAK_EVENT, () -> {
+		if (p == null || !p.isLoaded() || feature.isPlayerDisabled(p)) return;
+		TAB.getInstance().getCPUManager().runMeasuredTask("processing PlayerToggleSneakEvent", feature, TabConstants.CpuUsageCategory.PLAYER_SNEAK, () -> {
 			if (p.getArmorStandManager() != null) p.getArmorStandManager().sneak(e.isSneaking());
 		});
 	}
@@ -46,10 +46,37 @@ public class EventListener implements Listener {
 	 */
 	@EventHandler
 	public void onRespawn(PlayerRespawnEvent e) {
-		TAB.getInstance().getCPUManager().runMeasuredTask("processing PlayerRespawnEvent", TabFeature.NAMETAGX, UsageType.PLAYER_RESPAWN_EVENT, () -> {
+		TAB.getInstance().getCPUManager().runMeasuredTask("processing PlayerRespawnEvent", feature, TabConstants.CpuUsageCategory.PLAYER_RESPAWN, () -> {
 			TabPlayer respawned = TAB.getInstance().getPlayer(e.getPlayer().getUniqueId());
-			if (feature.isDisabledWorld(respawned.getWorldName()) || feature.isDisabledWorld(feature.disabledUnlimitedWorlds, respawned.getWorldName())) return;
+			if (feature.isPlayerDisabled(respawned)) return;
 			respawned.getArmorStandManager().teleport();
 		});
 	}
+	
+	@EventHandler
+	public void onWorldChange(PlayerChangedWorldEvent e) {
+		TabPlayer p = TAB.getInstance().getPlayer(e.getPlayer().getUniqueId());
+		if (p == null) return;
+		long time = System.nanoTime();
+		String to = e.getPlayer().getWorld().getName();
+		if (feature.isDisabled(to)) {
+			if (!feature.getPlayersInDisabledUnlimitedWorlds().contains(p))
+				feature.getPlayersInDisabledUnlimitedWorlds().add(p);
+		} else {
+			feature.getPlayersInDisabledUnlimitedWorlds().remove(p);
+		}
+		//TODO delete the block below
+		TabPlayer[] nearby = p.getArmorStandManager().getNearbyPlayers();
+		p.getArmorStandManager().destroy();
+		feature.loadArmorStands(p);
+		feature.getVehicleManager().loadPassengers(p);
+		for (TabPlayer viewer : TAB.getInstance().getOnlinePlayers()) {
+			if (viewer.getArmorStandManager() != null) viewer.getArmorStandManager().destroy(p);
+			if (!to.equals(viewer.getWorld())) continue;
+			for (TabPlayer player : nearby) {
+				if (player == viewer) feature.spawnArmorStands(p, viewer, true);
+			}
+		}
+		TAB.getInstance().getCPUManager().addTime(feature, TabConstants.CpuUsageCategory.WORLD_SWITCH, System.nanoTime()-time);
+	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/LocationRefresher.java

@@ -0,0 +1,38 @@
+package me.neznamy.tab.platforms.bukkit.features.unlimitedtags;
+
+import java.util.Collections;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+
+import me.neznamy.tab.api.TabFeature;
+import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.shared.TAB;
+
+public class LocationRefresher extends TabFeature {
+
+	private final NameTagX feature;
+	
+	public LocationRefresher(NameTagX feature) {
+		super(feature.getFeatureName(), "Processing passengers / preview");
+		this.feature = feature;
+		TAB.getInstance().getPlaceholderManager().registerPlayerPlaceholder("%location0%", 50, p -> {
+			
+			if (!feature.getVehicleManager().getPlayersInVehicle().containsKey(p) && !p.isPreviewingNametag()) return null;
+			Location l = ((Player)p.getPlayer()).getLocation();
+			return l.getX()+l.getY()+l.getZ(); //less cpu usage than literal Location#toString() and then .equals() when comparing last value
+		});
+		addUsedPlaceholders(Collections.singletonList("%location0%")); //making sure it's not the same one as in WitherBossBar
+	}
+	
+	@Override
+	public void refresh(TabPlayer p, boolean force) {
+		if (feature.getVehicleManager().getPlayersInVehicle().containsKey(p)) {
+			feature.getVehicleManager().processPassengers((Entity) p.getPlayer());
+		}
+		if (p.isPreviewingNametag()) {
+			p.getArmorStandManager().teleport(p);
+		}
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/NameTagX.java

@@ -3,214 +3,116 @@ package me.neznamy.tab.platforms.bukkit.features.unlimitedtags;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
-import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
-import org.bukkit.entity.Entity;
-import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
 import org.bukkit.event.HandlerList;
 import org.bukkit.plugin.java.JavaPlugin;
 
 import me.neznamy.tab.api.ArmorStand;
 import me.neznamy.tab.api.ArmorStandManager;
+import me.neznamy.tab.api.Property;
 import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
-import me.neznamy.tab.shared.Property;
-import me.neznamy.tab.shared.ProtocolVersion;
+import me.neznamy.tab.api.team.UnlimitedNametagManager;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.cpu.UsageType;
-import me.neznamy.tab.shared.features.NameTag;
+import me.neznamy.tab.shared.TabConstants;
+import me.neznamy.tab.shared.features.nametags.NameTag;
 
 /**
- * The core class for unlimited nametag mode
+ * The core class for unlimited NameTag mode
  */
-public class NameTagX extends NameTag {
+public class NameTagX extends NameTag implements UnlimitedNametagManager {
 
 	//config options
-	public boolean markerFor18x;
-	public boolean disableOnBoats;
-	private double spaceBetweenLines;
-	
-	//list of worlds with unlimited nametag mode disabled
-	protected List<String> disabledUnlimitedWorlds;
-	
-	//list of defined dynamic lines
-	public List<String> dynamicLines = Arrays.asList("belowname", "nametag", "abovename");
-	
-	//map of defined static lines
-	public Map<String, Object> staticLines = new ConcurrentHashMap<String, Object>();
-
-	//entity id counter to pick unique entity IDs
-	private int idCounter = 2000000000;
+	private final boolean markerFor18x = TAB.getInstance().getConfiguration().getConfig().getBoolean("scoreboard-teams.unlimited-nametag-mode.use-marker-tag-for-1-8-x-clients", false);
+	private final boolean disableOnBoats = TAB.getInstance().getConfiguration().getConfig().getBoolean("scoreboard-teams.unlimited-nametag-mode.disable-on-boats", true);
+	private final double spaceBetweenLines = TAB.getInstance().getConfiguration().getConfig().getDouble("scoreboard-teams.unlimited-nametag-mode.space-between-lines", 0.22);
+	protected final List<String> disabledUnlimitedWorlds = TAB.getInstance().getConfiguration().getConfig().getStringList("scoreboard-teams.unlimited-nametag-mode.disable-in-worlds", new ArrayList<>());
+	private final List<String> dynamicLines = new ArrayList<>(TAB.getInstance().getConfiguration().getConfig().getStringList("scoreboard-teams.unlimited-nametag-mode.dynamic-lines", Arrays.asList(TabConstants.Property.ABOVENAME, TabConstants.Property.NAMETAG, TabConstants.Property.BELOWNAME, "another")));
+	private final Map<String, Object> staticLines = TAB.getInstance().getConfiguration().getConfig().getConfigurationSection("scoreboard-teams.unlimited-nametag-mode.static-lines");
 
 	//player data by entityId, used for better performance
-	public Map<Integer, TabPlayer> entityIdMap = new ConcurrentHashMap<Integer, TabPlayer>();
-	
-	//map of vehicles carrying players
-	public Map<Integer, List<Entity>> vehicles = new ConcurrentHashMap<Integer, List<Entity>>();
-	
+	private final Map<Integer, TabPlayer> entityIdMap = new ConcurrentHashMap<>();
+
 	//bukkit event listener
-	private EventListener eventListener;
+	private final EventListener eventListener = new EventListener(this);
 	
-	//list of players currently on boats
-	public List<TabPlayer> playersOnBoats = new ArrayList<TabPlayer>();
+	private final List<TabPlayer> playersInDisabledUnlimitedWorlds = new ArrayList<>();
+	private final String[] disabledUnlimitedWorldsArray = disabledUnlimitedWorlds.toArray(new String[0]);
+	private final boolean unlimitedWorldWhitelistMode = disabledUnlimitedWorlds.contains("WHITELIST");
 	
-	//list of players currently in a vehicle
-	private Map<TabPlayer, Entity> playersInVehicle = new ConcurrentHashMap<TabPlayer, Entity>();
+	private final List<TabPlayer> playersDisabledWithAPI = new ArrayList<>();
 	
-	private Map<TabPlayer, Location> playerLocations = new ConcurrentHashMap<TabPlayer, Location>();
+	private final VehicleRefresher vehicleManager = new VehicleRefresher(this);
 
 	/**
 	 * Constructs new instance with given parameters and loads config options
 	 * @param plugin - plugin instance
-	 * @param nms - nms storage
-	 * @param tab - tab instance
 	 */
-	public NameTagX(JavaPlugin plugin, NMSStorage nms, TAB tab) {
-		super(tab);
-		markerFor18x = tab.getConfiguration().config.getBoolean("unlimited-nametag-prefix-suffix-mode.use-marker-tag-for-1-8-x-clients", false);
-		disableOnBoats = tab.getConfiguration().config.getBoolean("unlimited-nametag-prefix-suffix-mode.disable-on-boats", true);
-		spaceBetweenLines = tab.getConfiguration().config.getDouble("unlimited-nametag-prefix-suffix-mode.space-between-lines", 0.22);
-		disabledUnlimitedWorlds = tab.getConfiguration().config.getStringList("disable-features-in-worlds.unlimited-nametags", Arrays.asList("disabledworld"));
-		if (tab.getConfiguration().premiumconfig != null) {
-			List<String> realList = tab.getConfiguration().premiumconfig.getStringList("unlimited-nametag-mode-dynamic-lines", Arrays.asList("abovename", "nametag", "belowname", "another"));
-			dynamicLines = new ArrayList<String>();
-			dynamicLines.addAll(realList);
-			Collections.reverse(dynamicLines);
-			staticLines = tab.getConfiguration().premiumconfig.getConfigurationSection("unlimited-nametag-mode-static-lines");
-		}
-		refreshUsedPlaceholders();
-		eventListener = new EventListener(this);
+	public NameTagX(JavaPlugin plugin) {
+		Collections.reverse(dynamicLines);
 		Bukkit.getPluginManager().registerEvents(eventListener, plugin);
-		tab.getFeatureManager().registerFeature("nametagx-packet", new PacketListener(this, nms, tab));
-		tab.debug(String.format("Loaded Unlimited nametag feature with parameters markerFor18x=%s, disableOnBoats=%s, spaceBetweenLines=%s, disabledUnlimitedWorlds=%s",
+		TAB.getInstance().getFeatureManager().registerFeature("NameTagX-packet", new PacketListener(this));
+		TAB.getInstance().getFeatureManager().registerFeature("NameTagX-vehicle", vehicleManager);
+		TAB.getInstance().getFeatureManager().registerFeature("NameTagX-location", new LocationRefresher(this));
+		TAB.getInstance().debug(String.format("Loaded Unlimited NameTag feature with parameters markerFor18x=%s, disableOnBoats=%s, spaceBetweenLines=%s, disabledUnlimitedWorlds=%s",
 				markerFor18x, disableOnBoats, spaceBetweenLines, disabledUnlimitedWorlds));
 	}
 
 	@Override
 	public void load() {
-		super.load();
-		for (TabPlayer all : tab.getPlayers()) {
-			entityIdMap.put(((Player) all.getPlayer()).getEntityId(), all);
+		for (TabPlayer all : TAB.getInstance().getOnlinePlayers()) {
+			getEntityIdMap().put(((Player) all.getPlayer()).getEntityId(), all);
+			updateProperties(all);
 			loadArmorStands(all);
-			if (isDisabledWorld(all.getWorldName()) || isDisabledWorld(disabledUnlimitedWorlds, all.getWorldName())) continue;
-			loadPassengers(all);
-			for (TabPlayer viewer : tab.getPlayers()) {
+			if (isDisabled(all.getWorld())) {
+				playersInDisabledUnlimitedWorlds.add(all);
+			}
+			if (isPlayerDisabled(all)) continue;
+			vehicleManager.loadPassengers(all);
+			for (TabPlayer viewer : TAB.getInstance().getOnlinePlayers()) {
 				spawnArmorStands(all, viewer, false);
 			}
 		}
+		super.load();
 		startVisibilityRefreshTask();
-		startVehicleTickingTask();
 	}
 	
 	private void startVisibilityRefreshTask() {
-		tab.getCPUManager().startRepeatingMeasuredTask(500, "refreshing nametag visibility", getFeatureType(), UsageType.REFRESHING_NAMETAG_VISIBILITY_AND_COLLISION, new Runnable() {
-			public void run() {
-				for (TabPlayer p : tab.getPlayers()) {
-					if (!p.isLoaded() || isDisabledWorld(p.getWorldName()) || isDisabledWorld(disabledUnlimitedWorlds, p.getWorldName())) continue;
-					p.getArmorStandManager().updateVisibility(false);
-					if (!disableOnBoats) continue;
-					boolean onBoat = ((Player)p.getPlayer()).getVehicle() != null && ((Player)p.getPlayer()).getVehicle().getType() == EntityType.BOAT;
-					if (onBoat) {
-						if (!playersOnBoats.contains(p)) {
-							playersOnBoats.add(p);
-							updateTeamData(p);
-						}
-					} else {
-						if (playersOnBoats.contains(p)) {
-							playersOnBoats.remove(p);
-							updateTeamData(p);
-						}
-					}
-				}
-			}
-		});
-	}
-	
-	private void startVehicleTickingTask() {
-		tab.getCPUManager().startRepeatingMeasuredTask(100, "ticking vehicles", TabFeature.NAMETAGX, UsageType.TICKING_VEHICLES, () -> {
+		TAB.getInstance().getCPUManager().startRepeatingMeasuredTask(500, "refreshing NameTag visibility", this, TabConstants.CpuUsageCategory.REFRESHING_NAMETAG_VISIBILITY, () -> {
 			
-			for (TabPlayer p : TAB.getInstance().getPlayers()) {
-				if (!p.isLoaded()) continue;
-				if (isDisabledWorld(p.getWorldName()) || isDisabledWorld(disabledUnlimitedWorlds, p.getWorldName())) {
-					playersInVehicle.remove(p);
-					playerLocations.remove(p);
-					continue;
-				}
-				processVehicles(p);
-				if (!playerLocations.containsKey(p) || !playerLocations.get(p).equals(((Player)p.getPlayer()).getLocation())) {
-					playerLocations.put(p, ((Player)p.getPlayer()).getLocation());
-					processPassengers((Entity) p.getPlayer());
-					//also updating position if player is previewing since we're here as the code would be same if we want to avoid listening to move event
-					if (p.isPreviewingNametag() && p.getArmorStandManager() != null) {
-						p.getArmorStandManager().teleport(p);
-					}
-				}
+			for (TabPlayer p : TAB.getInstance().getOnlinePlayers()) {
+				if (!p.isLoaded() || isPlayerDisabled(p)) continue;
+				p.getArmorStandManager().updateVisibility(false);
 			}
 		});
 	}
-	
-	/**
-	 * Checks for vehicle changes of player and sends packets if needed
-	 * @param p - player to check
-	 */
-	private void processVehicles(TabPlayer p) {
-		Entity vehicle = ((Player)p.getPlayer()).getVehicle();
-		if (playersInVehicle.containsKey(p) && vehicle == null) {
-			//vehicle exit
-			vehicles.remove(playersInVehicle.get(p).getEntityId());
-			p.getArmorStandManager().teleport();
-			playersInVehicle.remove(p);
-		}
-		if (!playersInVehicle.containsKey(p) && vehicle != null) {
-			//vehicle enter
-			vehicles.put(vehicle.getEntityId(), getPassengers(vehicle));
-			p.getArmorStandManager().teleport();
-			playersInVehicle.put(p, vehicle);
-		}
-	}
-	
-	/**
-	 * Teleports armor stands of all passengers on specified vehicle
-	 * @param vehicle - entity to check passengers of
-	 */
-	private void processPassengers(Entity vehicle) {
-		for (Entity passenger : getPassengers(vehicle)) {
-			if (passenger instanceof Player) {
-				TabPlayer pl = TAB.getInstance().getPlayer(passenger.getUniqueId());
-				pl.getArmorStandManager().teleport();
-			} else {
-				processPassengers(passenger);
-			}
-		}
-	}
 
 	@Override
 	public void unload() {
 		super.unload();
 		HandlerList.unregisterAll(eventListener);
-		for (TabPlayer p : tab.getPlayers()) {
+		for (TabPlayer p : TAB.getInstance().getOnlinePlayers()) {
 			if (p.getArmorStandManager() != null) p.getArmorStandManager().destroy();
 		}
-		entityIdMap.clear();
+		getEntityIdMap().clear();
 	}
 
 	@Override
 	public void onJoin(TabPlayer connectedPlayer) {
+		if (isDisabled(connectedPlayer.getWorld()) && !playersInDisabledUnlimitedWorlds.contains(connectedPlayer))
+			playersInDisabledUnlimitedWorlds.add(connectedPlayer);
 		super.onJoin(connectedPlayer);
-		entityIdMap.put(((Player) connectedPlayer.getPlayer()).getEntityId(), connectedPlayer);
+		getEntityIdMap().put(((Player) connectedPlayer.getPlayer()).getEntityId(), connectedPlayer);
 		loadArmorStands(connectedPlayer);
-		if (isDisabledWorld(connectedPlayer.getWorldName()) || isDisabledWorld(disabledUnlimitedWorlds, connectedPlayer.getWorldName())) return;
-		loadPassengers(connectedPlayer);
-		for (TabPlayer viewer : tab.getPlayers()) {
+		if (isPlayerDisabled(connectedPlayer)) return;
+		vehicleManager.loadPassengers(connectedPlayer);
+		for (TabPlayer viewer : TAB.getInstance().getOnlinePlayers()) {
 			spawnArmorStands(connectedPlayer, viewer, true);
 		}
 	}
@@ -227,51 +129,31 @@ public class NameTagX extends NameTag {
 		return Math.sqrt(Math.pow(loc1.getX()-loc2.getX(), 2) + Math.pow(loc1.getZ()-loc2.getZ(), 2));
 	}
 
-	/**
-	 * Loads all passengers riding this player and adds them to vehicle list
-	 * @param p - player to load passengers of
-	 */
-	private void loadPassengers(TabPlayer p) {
-		if (((Entity) p.getPlayer()).getVehicle() == null) return;
-		Entity vehicle = ((Entity) p.getPlayer()).getVehicle();
-		vehicles.put(vehicle.getEntityId(), getPassengers(vehicle));
-	}
-
 	@Override
 	public void onQuit(TabPlayer disconnectedPlayer) {
 		super.onQuit(disconnectedPlayer);
-		for (TabPlayer all : tab.getPlayers()) {
+		for (TabPlayer all : TAB.getInstance().getOnlinePlayers()) {
 			if (all.getArmorStandManager() != null) all.getArmorStandManager().unregisterPlayer(disconnectedPlayer);
 		}
-		entityIdMap.remove(((Player) disconnectedPlayer.getPlayer()).getEntityId());
-		playersInVehicle.remove(disconnectedPlayer);
-		playerLocations.remove(disconnectedPlayer);
-		tab.getCPUManager().runTaskLater(100, "processing onQuit", getFeatureType(), UsageType.PLAYER_QUIT_EVENT, () -> disconnectedPlayer.getArmorStandManager().destroy());
-	}
-
-	@Override
-	public void onWorldChange(TabPlayer p, String from, String to) {
-		super.onWorldChange(p, from, to);
-		Set<TabPlayer> nearby = p.getArmorStandManager().getNearbyPlayers();
-		p.getArmorStandManager().destroy();
-		loadArmorStands(p);
-		loadPassengers(p);
-		for (TabPlayer viewer : tab.getPlayers()) {
-			viewer.getArmorStandManager().destroy(p);
-			if (nearby.contains(viewer) && to.equals(viewer.getWorldName())) spawnArmorStands(p, viewer, true);
+		getEntityIdMap().remove(((Player) disconnectedPlayer.getPlayer()).getEntityId());
+		playersInDisabledUnlimitedWorlds.remove(disconnectedPlayer);
+		playersDisabledWithAPI.remove(disconnectedPlayer);
+		if (disconnectedPlayer.getArmorStandManager() != null) { //player was not loaded yet
+			disconnectedPlayer.getArmorStandManager().destroy();
+			TAB.getInstance().getCPUManager().runTaskLater(500, "processing onQuit", this, TabConstants.CpuUsageCategory.PLAYER_QUIT, () -> disconnectedPlayer.getArmorStandManager().destroy());
 		}
 	}
-	
+
 	/**
 	 * Spawns armor stands of specified owner to viewer and, mutually if set
 	 * @param owner - armor stand owner
 	 * @param viewer - player to spawn armor stands for
 	 * @param sendMutually - if packets should be sent both ways
 	 */
-	private void spawnArmorStands(TabPlayer owner, TabPlayer viewer, boolean sendMutually) {
-		if (owner == viewer) return; //not displaying own armorstands
+	public void spawnArmorStands(TabPlayer owner, TabPlayer viewer, boolean sendMutually) {
+		if (owner == viewer) return; //not displaying own armor stands
 		if (((Player) viewer.getPlayer()).getWorld() != ((Player) owner.getPlayer()).getWorld()) return; //different world
-		if (isDisabledWorld(owner.getWorldName()) || isDisabledWorld(disabledUnlimitedWorlds, owner.getWorldName())) return;
+		if (isPlayerDisabled(owner)) return;
 		if (getDistance(viewer, owner) <= 48) {
 			if (((Player)viewer.getPlayer()).canSee((Player)owner.getPlayer()) && !owner.isVanished()) owner.getArmorStandManager().spawn(viewer);
 			if (sendMutually && viewer.getArmorStandManager() != null && ((Player)owner.getPlayer()).canSee((Player)viewer.getPlayer()) 
@@ -285,17 +167,20 @@ public class NameTagX extends NameTag {
 	 */
 	public void loadArmorStands(TabPlayer pl) {
 		pl.setArmorStandManager(new ArmorStandManager());
-		pl.setProperty("nametag", pl.getProperty("tagprefix").getCurrentRawValue() + pl.getProperty("customtagname").getCurrentRawValue() + pl.getProperty("tagsuffix").getCurrentRawValue());
-		double height = -spaceBetweenLines;
+		pl.setProperty(this, TabConstants.Property.NAMETAG, pl.getProperty(TabConstants.Property.TAGPREFIX).getCurrentRawValue() 
+				+ pl.getProperty(TabConstants.Property.CUSTOMTAGNAME).getCurrentRawValue()
+				+ pl.getProperty(TabConstants.Property.TAGSUFFIX).getCurrentRawValue());
+		double height = 0;
 		for (String line : dynamicLines) {
 			Property p = pl.getProperty(line);
 			if (p.getCurrentRawValue().length() == 0) continue;
-			pl.getArmorStandManager().addArmorStand(line, new BukkitArmorStand(idCounter++, pl, p, height+=spaceBetweenLines, false));
+			pl.getArmorStandManager().addArmorStand(line, new BukkitArmorStand(pl, p, height, false));
+			height += spaceBetweenLines;
 		}
 		for (Entry<String, Object> line : staticLines.entrySet()) {
 			Property p = pl.getProperty(line.getKey());
 			if (p.getCurrentRawValue().length() == 0) continue;
-			pl.getArmorStandManager().addArmorStand(line.getKey(), new BukkitArmorStand(idCounter++, pl, p, Double.parseDouble(line.getValue().toString()), true));
+			pl.getArmorStandManager().addArmorStand(line.getKey(), new BukkitArmorStand(pl, p, Double.parseDouble(line.getValue().toString()), true));
 		}
 		fixArmorStandHeights(pl);
 	}
@@ -305,7 +190,6 @@ public class NameTagX extends NameTag {
 	 * @param p - player to fix armor stands heights for
 	 */
 	public void fixArmorStandHeights(TabPlayer p) {
-		p.getArmorStandManager().refresh();
 		double currentY = -spaceBetweenLines;
 		for (ArmorStand as : p.getArmorStandManager().getArmorStands()) {
 			if (as.hasStaticOffset()) continue;
@@ -319,14 +203,14 @@ public class NameTagX extends NameTag {
 	@Override
 	public void refresh(TabPlayer refreshed, boolean force) {
 		super.refresh(refreshed, force);
-		if (isDisabledWorld(refreshed.getWorldName()) || isDisabledWorld(disabledUnlimitedWorlds, refreshed.getWorldName())) return;
+		if (isPlayerDisabled(refreshed)) return;
 		if (force) {
 			refreshed.getArmorStandManager().destroy();
 			loadArmorStands(refreshed);
-			loadPassengers(refreshed);
-			for (TabPlayer viewer : tab.getPlayers()) {
+			vehicleManager.loadPassengers(refreshed);
+			for (TabPlayer viewer : TAB.getInstance().getOnlinePlayers()) {
 				if (viewer == refreshed) continue;
-				if (viewer.getWorldName().equals(refreshed.getWorldName())) {
+				if (viewer.getWorld().equals(refreshed.getWorld())) {
 					refreshed.getArmorStandManager().spawn(viewer);
 				}
 			}
@@ -346,60 +230,189 @@ public class NameTagX extends NameTag {
 	 * Updates raw values of properties for specified player
 	 * @param p - player to update
 	 */
+	@Override
 	public void updateProperties(TabPlayer p) {
 		super.updateProperties(p);
-		p.loadPropertyFromConfig("customtagname", p.getName());
-		p.setProperty("nametag", p.getProperty("tagprefix").getCurrentRawValue() + p.getProperty("customtagname").getCurrentRawValue() + p.getProperty("tagsuffix").getCurrentRawValue());
+		p.loadPropertyFromConfig(this, TabConstants.Property.CUSTOMTAGNAME, p.getName());
+		p.setProperty(this, TabConstants.Property.NAMETAG, p.getProperty(TabConstants.Property.TAGPREFIX).getCurrentRawValue() + p.getProperty(TabConstants.Property.CUSTOMTAGNAME).getCurrentRawValue() + p.getProperty(TabConstants.Property.TAGSUFFIX).getCurrentRawValue());
 		for (String property : dynamicLines) {
-			if (!property.equals("nametag")) p.loadPropertyFromConfig(property);
+			if (!property.equals(TabConstants.Property.NAMETAG)) p.loadPropertyFromConfig(this, property);
 		}
 		for (String property : staticLines.keySet()) {
-			if (!property.equals("nametag")) p.loadPropertyFromConfig(property);
+			if (!property.equals(TabConstants.Property.NAMETAG)) p.loadPropertyFromConfig(this, property);
 		}
 	}
 
-	/**
-	 * Returns list of all passengers on specified vehicle
-	 * @param vehicle - vehicle to check passengers of
-	 * @return list of passengers
-	 */
-	@SuppressWarnings("deprecation")
-	public List<Entity> getPassengers(Entity vehicle){
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 11) {
-			return vehicle.getPassengers();
-		} else {
-			if (vehicle.getPassenger() != null) {
-				return Arrays.asList(vehicle.getPassenger());
-			} else {
-				return new ArrayList<Entity>();
+	@Override
+	public String getFeatureName() {
+		return "Unlimited NameTags";
+	}
+
+	@Override
+	public boolean getTeamVisibility(TabPlayer p, TabPlayer viewer) {
+		if (p.hasInvisibilityPotion()) return false; //1.8.x client sided bug
+		if (vehicleManager == null) return false; //class is still being initialized and this was called from super constructor
+		return vehicleManager.isOnBoat(p) || isPlayerDisabled(p);
+	}
+
+	public Map<Integer, TabPlayer> getEntityIdMap() {
+		return entityIdMap;
+	}
+
+	public boolean isDisabled(String world) {
+		boolean contains = contains(disabledUnlimitedWorldsArray, world);
+		if (unlimitedWorldWhitelistMode) contains = !contains;
+		return contains;
+	}
+
+	public boolean isPlayerDisabled(TabPlayer p) {
+		return isDisabledPlayer(p) || playersInDisabledUnlimitedWorlds.contains(p) || hasTeamHandlingPaused(p) || hasDisabledArmorStands(p);
+	}
+
+	public boolean isMarkerFor18x() {
+		return markerFor18x;
+	}
+
+	public List<TabPlayer> getPlayersInDisabledUnlimitedWorlds() {
+		return playersInDisabledUnlimitedWorlds;
+	}
+	
+	public VehicleRefresher getVehicleManager() {
+		return vehicleManager;
+	}
+	
+	@Override
+	public void pauseTeamHandling(TabPlayer player) {
+		if (teamHandlingPaused.contains(player)) return;
+		if (!isDisabledPlayer(player)) unregisterTeam(player);
+		teamHandlingPaused.add(player); //adding after, so unregisterTeam method runs
+		player.getArmorStandManager().destroy();
+	}
+	
+	@Override
+	public void resumeTeamHandling(TabPlayer player) {
+		if (!teamHandlingPaused.contains(player)) return;
+		teamHandlingPaused.remove(player); //removing before, so registerTeam method runs
+		if (!isDisabledPlayer(player)) registerTeam(player);
+		if (!isPlayerDisabled(player)) {
+			for (TabPlayer viewer : TAB.getInstance().getOnlinePlayers()) {
+				spawnArmorStands(player, viewer, false);
 			}
 		}
 	}
 
 	@Override
-	public void refreshUsedPlaceholders() {
-		usedPlaceholders = new HashSet<>(tab.getConfiguration().config.getUsedPlaceholderIdentifiersRecursive("tagprefix", "customtagname", "tagsuffix"));
-		for (String line : dynamicLines) {
-			usedPlaceholders.addAll(tab.getConfiguration().config.getUsedPlaceholderIdentifiersRecursive(line));
-		}
-		for (String line : staticLines.keySet()) {
-			usedPlaceholders.addAll(tab.getConfiguration().config.getUsedPlaceholderIdentifiersRecursive(line));
-		}
-		for (TabPlayer p : tab.getPlayers()) {
-			usedPlaceholders.addAll(tab.getPlaceholderManager().getUsedPlaceholderIdentifiersRecursive(p.getProperty("tagprefix").getCurrentRawValue(), 
-					p.getProperty("customtagname").getCurrentRawValue(), p.getProperty("tagsuffix").getCurrentRawValue(),
-					p.getProperty("abovename").getCurrentRawValue(), p.getProperty("belowname").getCurrentRawValue()));
-		}
+	public void disableArmorStands(TabPlayer player) {
+		if (playersDisabledWithAPI.contains(player)) return;
+		playersDisabledWithAPI.add(player);
+		player.getArmorStandManager().destroy();
+		updateTeamData(player);
 	}
 
 	@Override
-	public TabFeature getFeatureType() {
-		return TabFeature.NAMETAGX;
+	public void enableArmorStands(TabPlayer player) {
+		if (!playersDisabledWithAPI.contains(player)) return;
+		playersDisabledWithAPI.remove(player);
+		if (!isPlayerDisabled(player)) {
+			for (TabPlayer viewer : TAB.getInstance().getOnlinePlayers()) {
+				spawnArmorStands(player, viewer, false);
+			}
+		}
+		updateTeamData(player);
 	}
 
 	@Override
-	public boolean getTeamVisibility(TabPlayer p, TabPlayer viewer) {
-		//only visible if player is on boat & config option is enabled and player is not invisible (1.8 bug) or feature is disabled
-		return (playersOnBoats.contains(p) && !invisiblePlayers.contains(p.getName())) || isDisabledWorld(disabledUnlimitedWorlds, p.getWorldName());
+	public boolean hasDisabledArmorStands(TabPlayer player) {
+		return playersDisabledWithAPI.contains(player);
+	}
+	
+	@Override
+	public void setPrefix(TabPlayer player, String prefix) {
+		player.getProperty(TabConstants.Property.TAGPREFIX).setTemporaryValue(prefix);
+		rebuildNameTagLine(player);
+		player.forceRefresh();
+	}
+
+	@Override
+	public void setSuffix(TabPlayer player, String suffix) {
+		player.getProperty(TabConstants.Property.TAGSUFFIX).setTemporaryValue(suffix);
+		rebuildNameTagLine(player);
+		player.forceRefresh();
+	}
+
+	@Override
+	public void resetPrefix(TabPlayer player) {
+		player.getProperty(TabConstants.Property.TAGPREFIX).setTemporaryValue(null);
+		rebuildNameTagLine(player);
+		player.forceRefresh();
+	}
+
+	@Override
+	public void resetSuffix(TabPlayer player) {
+		player.getProperty(TabConstants.Property.TAGSUFFIX).setTemporaryValue(null);
+		rebuildNameTagLine(player);
+		player.forceRefresh();
+	}
+
+	@Override
+	public void setName(TabPlayer player, String customName) {
+		player.getProperty(TabConstants.Property.CUSTOMTAGNAME).setTemporaryValue(customName);
+		rebuildNameTagLine(player);
+		player.forceRefresh();
+	}
+
+	@Override
+	public void setLine(TabPlayer player, String line, String value) {
+		player.getProperty(line).setTemporaryValue(value);
+		player.forceRefresh();
+	}
+
+	@Override
+	public void resetName(TabPlayer player) {
+		player.getProperty(TabConstants.Property.CUSTOMTAGNAME).setTemporaryValue(null);
+		rebuildNameTagLine(player);
+		player.forceRefresh();
+	}
+
+	@Override
+	public void resetLine(TabPlayer player, String line) {
+		player.getProperty(line).setTemporaryValue(null);
+		player.forceRefresh();
+	}
+
+	@Override
+	public String getCustomName(TabPlayer player) {
+		return player.getProperty(TabConstants.Property.CUSTOMTAGNAME).getTemporaryValue();
+	}
+
+	@Override
+	public String getCustomLineValue(TabPlayer player, String line) {
+		return player.getProperty(line).getTemporaryValue();
+	}
+
+	@Override
+	public String getOriginalName(TabPlayer player) {
+		return player.getProperty(TabConstants.Property.CUSTOMTAGNAME).getOriginalRawValue();
+	}
+
+	@Override
+	public String getOriginalLineValue(TabPlayer player, String line) {
+		return player.getProperty(line).getOriginalRawValue();
+	}
+	
+	private void rebuildNameTagLine(TabPlayer player) {
+		player.setProperty(this, TabConstants.Property.NAMETAG, player.getProperty(TabConstants.Property.TAGPREFIX).getCurrentRawValue() + 
+				player.getProperty(TabConstants.Property.CUSTOMTAGNAME).getCurrentRawValue() + player.getProperty(TabConstants.Property.TAGSUFFIX).getCurrentRawValue());
+	}
+
+	public boolean isDisableOnBoats() {
+		return disableOnBoats;
+	}
+
+	@Override
+	public List<String> getDefinedLines() {
+		List<String> lines = new ArrayList<>(dynamicLines);
+		lines.addAll(staticLines.keySet());
+		return lines;
 	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/PacketListener.java

@@ -5,76 +5,74 @@ import java.util.List;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Player;
 
+import me.neznamy.tab.api.TabFeature;
 import me.neznamy.tab.api.TabPlayer;
 import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
+import me.neznamy.tab.shared.TabConstants;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.cpu.TabFeature;
-import me.neznamy.tab.shared.cpu.UsageType;
-import me.neznamy.tab.shared.features.types.packet.RawPacketListener;
 
 /**
  * The packet listening part for securing proper functionality of armor stands
- * Bukkit events are too unreliable and delayed/ahead which causes desync
+ * Bukkit events are too unreliable and delayed/ahead which causes de-sync
  */
-public class PacketListener implements RawPacketListener {
+public class PacketListener extends TabFeature {
 
 	//main feature
-	private NameTagX nameTagX;
+	private final NameTagX nameTagX;
 	
 	//nms storage
-	private NMSStorage nms;
-	
-	//tab instance
-	private TAB tab;
+	private final NMSStorage nms = NMSStorage.getInstance();
 
 	/**
 	 * Constructs new instance with given parameters and loads config options
 	 * @param nameTagX - main feature
-	 * @param nms - nms storage
-	 * @param tab - tab instance
 	 */
-	public PacketListener(NameTagX nameTagX, NMSStorage nms, TAB tab) {
+	public PacketListener(NameTagX nameTagX) {
+		super(nameTagX.getFeatureName(), null);
 		this.nameTagX = nameTagX;
-		this.nms = nms;
-		this.tab = tab;
 	}
 
 	@Override
-	public Object onPacketReceive(TabPlayer sender, Object packet) throws Throwable {
+	public boolean onPacketReceive(TabPlayer sender, Object packet) throws ReflectiveOperationException {
 		if (sender.getVersion().getMinorVersion() == 8 && nms.PacketPlayInUseEntity.isInstance(packet)) {
 			int entityId = nms.PacketPlayInUseEntity_ENTITY.getInt(packet);
 			TabPlayer attacked = null;
-			for (TabPlayer all : tab.getPlayers()) {
-				if (!all.isLoaded()) continue;
-				if (all.getArmorStandManager().hasArmorStandWithID(entityId)) {
+			for (TabPlayer all : TAB.getInstance().getOnlinePlayers()) {
+				if (all.isLoaded() && all.getArmorStandManager().hasArmorStandWithID(entityId)) {
 					attacked = all;
 					break;
 				}
 			}
 			if (attacked != null && attacked != sender) {
-				nms.PacketPlayInUseEntity_ENTITY.set(packet, ((Player) attacked.getPlayer()).getEntityId());
+				nms.setField(packet, nms.PacketPlayInUseEntity_ENTITY, ((Player) attacked.getPlayer()).getEntityId());
 			}
 		}
-		return packet;
+		return false;
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
-	public void onPacketSend(TabPlayer receiver, Object packet) throws Throwable {
+	public void onPacketSend(TabPlayer receiver, Object packet) throws ReflectiveOperationException {
 		if (receiver.getVersion().getMinorVersion() < 8) return;
-		//using bukkit player to check world due to old data on world change due to asynchronous processing & world name changing
-		String world = ((Player)receiver.getPlayer()).getWorld().getName();
-		if (!receiver.isLoaded() || nameTagX.isDisabledWorld(world) || nameTagX.isDisabledWorld(nameTagX.disabledUnlimitedWorlds, world)) return;
+		if (!receiver.isLoaded() || nameTagX.isDisabledPlayer(receiver) || nameTagX.getPlayersInDisabledUnlimitedWorlds().contains(receiver)) return;
 		if (nms.PacketPlayOutEntity.isInstance(packet) && !nms.PacketPlayOutEntityLook.isInstance(packet)) { //ignoring head rotation only packets
 			onEntityMove(receiver, nms.PacketPlayOutEntity_ENTITYID.getInt(packet));
-		}
-		if (nms.PacketPlayOutEntityTeleport.isInstance(packet)) {
+		} else if (nms.PacketPlayOutEntityTeleport.isInstance(packet)) {
 			onEntityMove(receiver, nms.PacketPlayOutEntityTeleport_ENTITYID.getInt(packet));
-		}
-		if (nms.PacketPlayOutNamedEntitySpawn.isInstance(packet)) {
+		} else if (nms.PacketPlayOutNamedEntitySpawn.isInstance(packet)) {
 			onEntitySpawn(receiver, nms.PacketPlayOutNamedEntitySpawn_ENTITYID.getInt(packet));
-		}
-		if (nms.PacketPlayOutEntityDestroy.isInstance(packet)) {
-			onEntityDestroy(receiver, (int[]) nms.PacketPlayOutEntityDestroy_ENTITIES.get(packet));
+		} else if (nms.PacketPlayOutEntityDestroy.isInstance(packet)) {
+			if (nms.getMinorVersion() >= 17) {
+				Object entities = nms.PacketPlayOutEntityDestroy_ENTITIES.get(packet);
+				if (entities instanceof List) {
+					onEntityDestroy(receiver, (List<Integer>) entities);
+				} else {
+					//1.17.0
+					onEntityDestroy(receiver, (int) entities);
+				}
+			} else {
+				onEntityDestroy(receiver, (int[]) nms.PacketPlayOutEntityDestroy_ENTITIES.get(packet));
+			}
 		}
 	}
 
@@ -83,40 +81,46 @@ public class PacketListener implements RawPacketListener {
 	 * @param receiver - packet receiver
 	 * @param entityId - entity that moved
 	 */
-	public void onEntityMove(TabPlayer receiver, int entityId) {
-		TabPlayer pl = nameTagX.entityIdMap.get(entityId);
+	private void onEntityMove(TabPlayer receiver, int entityId) {
+		TabPlayer pl = nameTagX.getEntityIdMap().get(entityId);
 		List<Entity> vehicleList;
 		if (pl != null) {
 			//player moved
-			tab.getCPUManager().runMeasuredTask("processing EntityMove", getFeatureType(), UsageType.PACKET_ENTITY_MOVE, () -> pl.getArmorStandManager().teleport(receiver));
-		} else if ((vehicleList = nameTagX.vehicles.get(entityId)) != null){
+			if (nameTagX.isPlayerDisabled(pl)) return;
+			TAB.getInstance().getCPUManager().runMeasuredTask("processing EntityMove", nameTagX, TabConstants.CpuUsageCategory.PACKET_ENTITY_MOVE, () -> pl.getArmorStandManager().teleport(receiver));
+		} else if ((vehicleList = nameTagX.getVehicleManager().getVehicles().get(entityId)) != null){
 			//a vehicle carrying something moved
 			for (Entity entity : vehicleList) {
-				TabPlayer passenger = nameTagX.entityIdMap.get(entity.getEntityId());
+				TabPlayer passenger = nameTagX.getEntityIdMap().get(entity.getEntityId());
 				if (passenger != null && passenger.getArmorStandManager() != null) {
-					tab.getCPUManager().runMeasuredTask("processing EntityMove", getFeatureType(), UsageType.PACKET_ENTITY_MOVE, () -> passenger.getArmorStandManager().teleport(receiver));
+					TAB.getInstance().getCPUManager().runMeasuredTask("processing EntityMove", nameTagX, TabConstants.CpuUsageCategory.PACKET_ENTITY_MOVE_PASSENGER, () -> passenger.getArmorStandManager().teleport(receiver));
 				}
 			}
 		}
 	}
 	
-	public void onEntitySpawn(TabPlayer receiver, int entityId) {
-		TabPlayer spawnedPlayer = nameTagX.entityIdMap.get(entityId);
-		if (spawnedPlayer != null && spawnedPlayer.isLoaded()) {
-			tab.getCPUManager().runMeasuredTask("processing NamedEntitySpawn", getFeatureType(), UsageType.PACKET_NAMED_ENTITY_SPAWN, () -> spawnedPlayer.getArmorStandManager().spawn(receiver));
+	private void onEntitySpawn(TabPlayer receiver, int entityId) {
+		TabPlayer spawnedPlayer = nameTagX.getEntityIdMap().get(entityId);
+		if (spawnedPlayer != null && spawnedPlayer.isLoaded() && !nameTagX.isPlayerDisabled(spawnedPlayer)) {
+			TAB.getInstance().getCPUManager().runMeasuredTask("processing NamedEntitySpawn", nameTagX, TabConstants.CpuUsageCategory.PACKET_ENTITY_SPAWN, () -> spawnedPlayer.getArmorStandManager().spawn(receiver));
 		}
 	}
 
-	public void onEntityDestroy(TabPlayer receiver, int[] entities) {
-		for (int id : entities) {
-			TabPlayer despawnedPlayer = nameTagX.entityIdMap.get(id);
-			if (despawnedPlayer != null && despawnedPlayer.isLoaded()) 
-				tab.getCPUManager().runMeasuredTask("processing EntityDestroy", getFeatureType(), UsageType.PACKET_ENTITY_DESTROY, () -> despawnedPlayer.getArmorStandManager().destroy(receiver));
+	private void onEntityDestroy(TabPlayer receiver, List<Integer> entities) {
+		for (int entity : entities) {
+			onEntityDestroy(receiver, entity);
 		}
 	}
-
-	@Override
-	public TabFeature getFeatureType() {
-		return TabFeature.NAMETAGX;
+	
+	private void onEntityDestroy(TabPlayer receiver, int... entities) {
+		for (int entity : entities) {
+			onEntityDestroy(receiver, entity);
+		}
+	}
+	
+	private void onEntityDestroy(TabPlayer receiver, int entity) {
+		TabPlayer deSpawnedPlayer = nameTagX.getEntityIdMap().get(entity);
+		if (deSpawnedPlayer != null && deSpawnedPlayer.isLoaded() && !nameTagX.isPlayerDisabled(deSpawnedPlayer))
+			TAB.getInstance().getCPUManager().runMeasuredTask("processing EntityDestroy", nameTagX, TabConstants.CpuUsageCategory.PACKET_ENTITY_DESTROY, () -> deSpawnedPlayer.getArmorStandManager().destroy(receiver));
 	}
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/VehicleRefresher.java

@@ -0,0 +1,119 @@
+package me.neznamy.tab.platforms.bukkit.features.unlimitedtags;
+
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+
+import me.neznamy.tab.api.TabFeature;
+import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.shared.TAB;
+
+public class VehicleRefresher extends TabFeature {
+
+	//list of players currently in a vehicle
+	private final Map<TabPlayer, Entity> playersInVehicle = new ConcurrentHashMap<>();
+	
+	//map of vehicles carrying players
+	private final Map<Integer, List<Entity>> vehicles = new ConcurrentHashMap<>();
+	
+	//list of players currently on boats
+	private final List<TabPlayer> playersOnBoats = new ArrayList<>();
+	
+	private final NameTagX feature;
+		
+	public VehicleRefresher(NameTagX feature) {
+		super(feature.getFeatureName(), "Refreshing vehicles");
+		this.feature = feature;
+		addUsedPlaceholders(Collections.singletonList("%vehicle%"));
+		TAB.getInstance().getPlaceholderManager().registerPlayerPlaceholder("%vehicle%", 100, p -> ((Player)p.getPlayer()).getVehicle());
+	}
+	
+	@Override
+	public void refresh(TabPlayer p, boolean force) {
+		if (feature.isPlayerDisabled(p)) return;
+		Entity vehicle = ((Player)p.getPlayer()).getVehicle();
+		if (playersInVehicle.containsKey(p) && vehicle == null) {
+			//vehicle exit
+			vehicles.remove(playersInVehicle.get(p).getEntityId());
+			p.getArmorStandManager().teleport();
+			playersInVehicle.remove(p);
+			if (feature.isDisableOnBoats() && playersOnBoats.contains(p)) {
+				playersOnBoats.remove(p);
+				feature.updateTeamData(p);
+			}
+		}
+		if (!playersInVehicle.containsKey(p) && vehicle != null) {
+			//vehicle enter
+			vehicles.put(vehicle.getEntityId(), getPassengers(vehicle));
+			p.getArmorStandManager().respawn(); //making teleport instant instead of showing teleport animation
+			playersInVehicle.put(p, vehicle);
+			if (feature.isDisableOnBoats() && vehicle.getType() == EntityType.BOAT) {
+				playersOnBoats.add(p);
+				feature.updateTeamData(p);
+			}
+		}
+	}
+
+	public boolean isOnBoat(TabPlayer p) {
+		return playersOnBoats.contains(p);
+	}
+
+	@Override
+	public void onQuit(TabPlayer disconnectedPlayer) {
+		if (playersInVehicle.containsKey(disconnectedPlayer)) vehicles.remove(playersInVehicle.get(disconnectedPlayer).getEntityId());
+		playersInVehicle.remove(disconnectedPlayer);
+		playersOnBoats.remove(disconnectedPlayer);
+	}
+	
+	public Map<Integer, List<Entity>> getVehicles() {
+		return vehicles;
+	}
+	
+	/**
+	 * Returns list of all passengers on specified vehicle
+	 * @param vehicle - vehicle to check passengers of
+	 * @return list of passengers
+	 */
+	@SuppressWarnings("deprecation")
+	public List<Entity> getPassengers(Entity vehicle){
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 11) {
+			return vehicle.getPassengers();
+		} else {
+			if (vehicle.getPassenger() != null) {
+				return Collections.singletonList(vehicle.getPassenger());
+			} else {
+				return new ArrayList<>();
+			}
+		}
+	}
+	
+	/**
+	 * Loads all passengers riding this player and adds them to vehicle list
+	 * @param p - player to load passengers of
+	 */
+	public void loadPassengers(TabPlayer p) {
+		Entity vehicle = ((Entity) p.getPlayer()).getVehicle();
+		if (vehicle == null) return;
+		vehicles.put(vehicle.getEntityId(), getPassengers(vehicle));
+	}
+	
+	/**
+	 * Teleports armor stands of all passengers on specified vehicle
+	 * @param vehicle - entity to check passengers of
+	 */
+	public void processPassengers(Entity vehicle) {
+		for (Entity passenger : getPassengers(vehicle)) {
+			if (passenger instanceof Player) {
+				TAB.getInstance().getPlayer(passenger.getUniqueId()).getArmorStandManager().teleport();
+			}
+			processPassengers(passenger);
+		}
+	}
+
+	public Map<TabPlayer, Entity> getPlayersInVehicle() {
+		return playersInVehicle;
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/PacketPlayOutEntityDestroy.java

@@ -0,0 +1,23 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import java.util.Arrays;
+
+import me.neznamy.tab.api.protocol.TabPacket;
+
+public class PacketPlayOutEntityDestroy implements TabPacket {
+
+	private final int[] entities;
+
+	public PacketPlayOutEntityDestroy(int... entities) {
+		this.entities = entities;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutEntityDestroy{entities=%s}", Arrays.toString(entities));
+	}
+
+	public int[] getEntities() {
+		return entities;
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/PacketPlayOutEntityMetadata.java

@@ -0,0 +1,29 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import me.neznamy.tab.api.protocol.TabPacket;
+import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
+
+public class PacketPlayOutEntityMetadata implements TabPacket {
+
+	private final int entityId;
+
+	private final DataWatcher dataWatcher;
+
+	public PacketPlayOutEntityMetadata(int entityId, DataWatcher dataWatcher) {
+		this.entityId = entityId;
+		this.dataWatcher = dataWatcher;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutEntityMetadata{entityId=%s,dataWatcher=%s}", entityId, dataWatcher);
+	}
+
+	public int getEntityId() {
+		return entityId;
+	}
+
+	public DataWatcher getDataWatcher() {
+		return dataWatcher;
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/PacketPlayOutEntityTeleport.java

@@ -0,0 +1,30 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import org.bukkit.Location;
+
+import me.neznamy.tab.api.protocol.TabPacket;
+
+public class PacketPlayOutEntityTeleport implements TabPacket {
+
+	private final int entityId;
+
+	private final Location location;
+
+	public PacketPlayOutEntityTeleport(int entityId, Location location) {
+		this.entityId = entityId;
+		this.location = location;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutEntityTeleport{entityId=%s,location=%s}", entityId, location);
+	}
+
+	public int getEntityId() {
+		return entityId;
+	}
+
+	public Location getLocation() {
+		return location;
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/PacketPlayOutSpawnEntityLiving.java

@@ -0,0 +1,56 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import java.util.UUID;
+
+import org.bukkit.Location;
+import org.bukkit.entity.EntityType;
+
+import me.neznamy.tab.api.protocol.TabPacket;
+import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
+
+public class PacketPlayOutSpawnEntityLiving implements TabPacket {
+
+	private final int entityId;
+
+	private final UUID uuid;
+
+	private final EntityType entityType;
+
+	private final Location location;
+
+	private final DataWatcher dataWatcher;
+
+	public PacketPlayOutSpawnEntityLiving(int entityId, UUID uuid, EntityType entityType, Location location, DataWatcher dataWatcher) {
+		this.entityId = entityId;
+		this.uuid = uuid;
+		this.entityType = entityType;
+		this.location = location;
+		this.dataWatcher = dataWatcher;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("PacketPlayOutSpawnEntityLiving{entityId=%s,uuid=%s,entityType=%s,location=%s,dataWatcher=%s}", 
+				entityId, uuid, entityType, location, dataWatcher);
+	}
+
+	public int getEntityId() {
+		return entityId;
+	}
+
+	public UUID getUniqueId() {
+		return uuid;
+	}
+
+	public EntityType getEntityType() {
+		return entityType;
+	}
+
+	public Location getLocation() {
+		return location;
+	}
+
+	public DataWatcher getDataWatcher() {
+		return dataWatcher;
+	}
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/datawatcher/DataWatcher.java

@@ -5,18 +5,17 @@ import java.util.List;
 import java.util.Map;
 
 import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
-import me.neznamy.tab.shared.ProtocolVersion;
 
 /**
  * A class representing the n.m.s.DataWatcher class to make work with it much easier
  */
 public class DataWatcher {
 
-	//datawatcher data
-	private Map<Integer, DataWatcherItem> dataValues = new HashMap<Integer, DataWatcherItem>();
+	//DataWatcher data
+	private final Map<Integer, DataWatcherItem> dataValues = new HashMap<>();
 	
 	//a helper for easier data write
-	private DataWatcherHelper helper = new DataWatcherHelper(this);
+	private final DataWatcherHelper helper = new DataWatcherHelper(this);
 
 	/**
 	 * Sets value into data values
@@ -24,7 +23,7 @@ public class DataWatcher {
 	 * @param value - value
 	 */
 	public void setValue(DataWatcherObject type, Object value){
-		dataValues.put(type.position, new DataWatcherItem(type, value));
+		dataValues.put(type.getPosition(), new DataWatcherItem(type, value));
 	}
 
 	/**
@@ -55,37 +54,45 @@ public class DataWatcher {
 	/**
 	 * Converts the class into an instance of NMS.DataWatcher
 	 * @return an instance of NMS.DataWatcher with same data
-	 * @throws Exception - if something fails
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
 	 */
-	public Object toNMS() throws Exception {
+	public Object toNMS() throws ReflectiveOperationException {
 		NMSStorage nms = NMSStorage.getInstance();
-		Object nmsWatcher = nms.newDataWatcher.newInstance(new Object[] {null});
+		Object nmsWatcher;
+		if (nms.newDataWatcher.getParameterCount() == 1) { //1.7+
+			Object[] args = new Object[] {null};
+			nmsWatcher = nms.newDataWatcher.newInstance(args);
+		} else {
+			nmsWatcher = nms.newDataWatcher.newInstance();
+		}
 		for (DataWatcherItem item : dataValues.values()) {
 			Object position;
-			if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 9) {
-				position = nms.newDataWatcherObject.newInstance(item.type.position, item.type.classType);
+			if (nms.getMinorVersion() >= 9) {
+				position = nms.newDataWatcherObject.newInstance(item.getType().getPosition(), item.getType().getClassType());
 			} else {
-				position = item.type.position;
+				position = item.getType().getPosition();
 			}
-			nms.DataWatcher_REGISTER.invoke(nmsWatcher, position, item.value);
+			nms.DataWatcher_REGISTER.invoke(nmsWatcher, position, item.getValue());
 		}
 		return nmsWatcher;
 	}
 	
 	/**
 	 * Reads NMS data watcher and returns and instance of this class with same data
-	 * @param nmsWatcher - NMS datawatcher to read
+	 * @param nmsWatcher - NMS DataWatcher to read
 	 * @return an instance of this class with same values
-	 * @throws Exception - if something fails
+	 * @throws	ReflectiveOperationException
+	 * 			if thrown by reflective operation
 	 */
 	@SuppressWarnings("unchecked")
-	public static DataWatcher fromNMS(Object nmsWatcher) throws Exception{
+	public static DataWatcher fromNMS(Object nmsWatcher) throws ReflectiveOperationException {
 		DataWatcher watcher = new DataWatcher();
 		List<Object> items = (List<Object>) nmsWatcher.getClass().getMethod("c").invoke(nmsWatcher);
 		if (items != null) {
 			for (Object watchableObject : items) {
 				DataWatcherItem w = DataWatcherItem.fromNMS(watchableObject);
-				watcher.setValue(w.type, w.value);
+				watcher.setValue(w.getType(), w.getValue());
 			}
 		}
 		return watcher;

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/datawatcher/DataWatcherHelper.java

@@ -2,25 +2,25 @@ package me.neznamy.tab.platforms.bukkit.nms.datawatcher;
 
 import java.util.Optional;
 
+import me.neznamy.tab.api.ProtocolVersion;
+import me.neznamy.tab.api.chat.IChatBaseComponent;
 import me.neznamy.tab.platforms.bukkit.BukkitPacketBuilder;
 import me.neznamy.tab.platforms.bukkit.nms.NMSStorage;
-import me.neznamy.tab.shared.ProtocolVersion;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.packets.IChatBaseComponent;
 
 /**
- * A class to help assigning DataWatcher items as positions often change per-version
+ * A class to help to assign DataWatcher items as positions often change per-version
  */
 public class DataWatcherHelper {
 
 	//position of armor stand flags
-	private final int ARMOR_STAND_BYTEFLAGS_POSITION = getArmorStandFlagsPosition();
+	private final int armorStandFlagsPosition = getArmorStandFlagsPosition();
 
-	//original datawatcher to write to
-	private DataWatcher data;
+	//original DataWatcher to write to
+	private final DataWatcher data;
 	
 	//data watcher registry
-	private DataWatcherRegistry registry;
+	private final DataWatcherRegistry registry;
 	
 	/**
 	 * Constructs new instance of this class with given parent
@@ -28,7 +28,7 @@ public class DataWatcherHelper {
 	 */
 	public DataWatcherHelper(DataWatcher data) {
 		this.data = data;
-		this.registry = NMSStorage.getInstance().dataWatcherRegistry;
+		this.registry = NMSStorage.getInstance().getDataWatcherRegistry();
 	}
 	
 	/**
@@ -36,13 +36,16 @@ public class DataWatcherHelper {
 	 * @return armor stand flags position based on server version
 	 */
 	private int getArmorStandFlagsPosition() {
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 15) {
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 17) {
+			//1.17.x, 1.18.x
+			return 15;
+		} else if (TAB.getInstance().getServerVersion().getMinorVersion() >= 15) {
 			//1.15.x, 1.16.x
 			return 14;
-		} else if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 14) {
+		} else if (TAB.getInstance().getServerVersion().getMinorVersion() >= 14) {
 			//1.14.x
 			return 13;
-		} else if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 10) {
+		} else if (TAB.getInstance().getServerVersion().getMinorVersion() >= 10) {
 			//1.10.x - 1.13.x
 			return 11;
 		} else {
@@ -56,7 +59,7 @@ public class DataWatcherHelper {
 	 * @param flags - flags to write
 	 */
 	public void setEntityFlags(byte flags) {
-		data.setValue(new DataWatcherObject(0, registry.Byte), flags);
+		data.setValue(new DataWatcherObject(0, registry.getByte()), flags);
 	}
 	
 	/**
@@ -65,17 +68,22 @@ public class DataWatcherHelper {
 	 * @param clientVersion - client version
 	 */
 	public void setCustomName(String customName, ProtocolVersion clientVersion) {
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 13) {
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 13) {
 			try {
-				data.setValue(new DataWatcherObject(2, registry.Optional_IChatBaseComponent), Optional.ofNullable(((BukkitPacketBuilder)TAB.getInstance().getPacketBuilder()).toNMSComponent(IChatBaseComponent.optimizedComponent(customName), clientVersion)));
-			} catch (Exception e) {
+				data.setValue(new DataWatcherObject(2, registry.getOptionalComponent()), Optional.ofNullable(((BukkitPacketBuilder)TAB.getInstance().getPlatform().getPacketBuilder()).toNMSComponent(IChatBaseComponent.optimizedComponent(customName), clientVersion)));
+			} catch (ReflectiveOperationException e) {
 				TAB.getInstance().getErrorManager().printError("Failed to create component", e);
 			}
-		} else if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 8){
-			data.setValue(new DataWatcherObject(2, registry.String), customName);
+		} else if (TAB.getInstance().getServerVersion().getMinorVersion() >= 8){
+			data.setValue(new DataWatcherObject(2, registry.getString()), customName);
 		} else {
+			//name length is limited to 64 characters on <1.8
 			String cutName = (customName.length() > 64 ? customName.substring(0, 64) : customName);
-			data.setValue(new DataWatcherObject(10, registry.String), cutName);
+			if (TAB.getInstance().getServerVersion().getMinorVersion() >= 6){
+				data.setValue(new DataWatcherObject(10, registry.getString()), cutName);
+			} else {
+				data.setValue(new DataWatcherObject(5, registry.getString()), cutName);
+			}
 		}
 			
 	}
@@ -85,10 +93,10 @@ public class DataWatcherHelper {
 	 * @param visible - if visible or not
 	 */
 	public void setCustomNameVisible(boolean visible) {
-		if (ProtocolVersion.SERVER_VERSION.getMinorVersion() >= 9) {
-			data.setValue(new DataWatcherObject(3, registry.Boolean), visible);
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 9) {
+			data.setValue(new DataWatcherObject(3, registry.getBoolean()), visible);
 		} else {
-			data.setValue(new DataWatcherObject(3, registry.Byte), (byte)(visible?1:0));
+			data.setValue(new DataWatcherObject(3, registry.getByte()), (byte)(visible?1:0));
 		}
 	}
 	
@@ -97,7 +105,11 @@ public class DataWatcherHelper {
 	 * @param health - health of entity
 	 */
 	public void setHealth(float health) {
-		data.setValue(new DataWatcherObject(6, registry.Float), health);
+		if (TAB.getInstance().getServerVersion().getMinorVersion() >= 6) {
+			data.setValue(new DataWatcherObject(6, registry.getFloat()), health);
+		} else {
+			data.setValue(new DataWatcherObject(16, registry.getInteger()), (int)health);
+		}
 	}
 	
 	/**
@@ -105,6 +117,6 @@ public class DataWatcherHelper {
 	 * @param flags - flags to write
 	 */
 	public void setArmorStandFlags(byte flags) {
-		data.setValue(new DataWatcherObject(ARMOR_STAND_BYTEFLAGS_POSITION, registry.Byte), flags);
+		data.setValue(new DataWatcherObject(armorStandFlagsPosition, registry.getByte()), flags);
 	}
 }