4.10.1 Release

Minecraft 1.20.4 and earlier silently overrides the previous values if multiple registry elements have the same id (Tested using a Fabric 1.20.4 mod by parsing a registry sent by a server and then printing the parsed objects).

api/src/main/java/com/viaversion/viaversion/api/data/FullMappings.java

@@ -49,17 +49,17 @@ public interface FullMappings extends BiMappings {
      * Returns the unmapped string identifier for the given mapped id.
      *
      * @param id unmapped id
-     * @return unmapped string identifier
+     * @return unmapped string identifier, or null if out of bounds
      */
-    String identifier(int id);
+    @Nullable String identifier(int id);
 
     /**
      * Returns the mapped string identifier for the given mapped id.
      *
      * @param mappedId mapped id
-     * @return mapped string identifier
+     * @return mapped string identifier, or null if out of bounds
      */
-    String mappedIdentifier(int mappedId);
+    @Nullable String mappedIdentifier(int mappedId);
 
     /**
      * Returns the mapped string identifier for the given unmapped identifier.

api/src/main/java/com/viaversion/viaversion/api/data/FullMappingsBase.java

@@ -66,12 +66,20 @@ public class FullMappingsBase implements FullMappings {
 
     @Override
     public String identifier(final int id) {
+        if (id < 0 || id >= idToString.length) {
+            return null;
+        }
+
         final String identifier = idToString[id];
         return Key.namespaced(identifier);
     }
 
     @Override
     public String mappedIdentifier(final int mappedId) {
+        if (mappedId < 0 || mappedId >= mappedIdToString.length) {
+            return null;
+        }
+
         final String identifier = mappedIdToString[mappedId];
         return Key.namespaced(identifier);
     }

api/src/main/java/com/viaversion/viaversion/api/data/MappingDataBase.java

@@ -132,8 +132,19 @@ public class MappingDataBase implements MappingData {
         return MappingDataLoader.INSTANCE.loadMappings(data, key);
     }
 
-    protected @Nullable FullMappings loadFullMappings(final CompoundTag data, final CompoundTag unmappedIdentifiers, final CompoundTag mappedIdentifiers, final String key) {
-        return MappingDataLoader.INSTANCE.loadFullMappings(data, unmappedIdentifiers, mappedIdentifiers, key);
+    protected @Nullable FullMappings loadFullMappings(final CompoundTag data, final CompoundTag unmappedIdentifiersTag, final CompoundTag mappedIdentifiersTag, final String key) {
+        if (!unmappedIdentifiersTag.contains(key) || !mappedIdentifiersTag.contains(key)) {
+            return null;
+        }
+
+        final List<String> unmappedIdentifiers = identifiersFromGlobalIds(unmappedIdentifiersTag, key);
+        final List<String> mappedIdentifiers = identifiersFromGlobalIds(mappedIdentifiersTag, key);
+        Mappings mappings = loadBiMappings(data, key); // Load as bi-mappings to keep the inverse cached
+        if (mappings == null) {
+            mappings = new IdentityMappings(unmappedIdentifiers.size(), mappedIdentifiers.size());
+        }
+
+        return new FullMappingsBase(unmappedIdentifiers, mappedIdentifiers, mappings);
     }
 
     protected @Nullable BiMappings loadBiMappings(final CompoundTag data, final String key) {

api/src/main/java/com/viaversion/viaversion/api/data/MappingDataLoader.java

@@ -53,7 +53,6 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.logging.Logger;
-import java.util.stream.Collectors;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class MappingDataLoader {
@@ -276,21 +275,6 @@ public class MappingDataLoader {
         return mappingsSupplier.create(mappings, mappedSizeTag.asInt());
     }
 
-    public FullMappings loadFullMappings(final CompoundTag mappingsTag, final CompoundTag unmappedIdentifiersTag, final CompoundTag mappedIdentifiersTag, final String key) {
-        if (!unmappedIdentifiersTag.contains(key) || !mappedIdentifiersTag.contains(key)) {
-            return null;
-        }
-
-        final List<String> unmappedIdentifiers = identifiersFromGlobalIds(unmappedIdentifiersTag, key);
-        final List<String> mappedIdentifiers = identifiersFromGlobalIds(mappedIdentifiersTag, key);
-        Mappings mappings = loadMappings(mappingsTag, key);
-        if (mappings == null) {
-            mappings = new IdentityMappings(unmappedIdentifiers.size(), mappedIdentifiers.size());
-        }
-
-        return new FullMappingsBase(unmappedIdentifiers, mappedIdentifiers, mappings);
-    }
-
     public @Nullable List<String> identifiersFromGlobalIds(final CompoundTag mappingsTag, final String key) {
         final Mappings mappings = loadMappings(mappingsTag, key);
         if (mappings == null) {

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataContainer.java

@@ -22,6 +22,7 @@
  */
 package com.viaversion.viaversion.api.minecraft.data;
 
+import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.data.FullMappings;
 import com.viaversion.viaversion.api.protocol.Protocol;
@@ -44,7 +45,7 @@ public final class StructuredDataContainer {
     public StructuredDataContainer(final StructuredData<?>[] dataArray) {
         this(new Reference2ObjectOpenHashMap<>(dataArray.length));
         for (final StructuredData<?> data : dataArray) {
-            add(data);
+            this.data.put(data.key(), data);
         }
     }
 
@@ -138,6 +139,7 @@ public final class StructuredDataContainer {
      */
     public void setIdLookup(final Protocol<?, ?, ?, ?> protocol, final boolean mappedNames) {
         this.lookup = protocol.getMappingData().getDataComponentSerializerMappings();
+        Preconditions.checkNotNull(this.lookup, "Data component serializer mappings are null");
         this.mappedNames = mappedNames;
     }
 
@@ -159,10 +161,6 @@ public final class StructuredDataContainer {
         return data;
     }
 
-    private <T> void add(final StructuredData<T> data) {
-        set(data.key(), data.value());
-    }
-
     @Override
     public String toString() {
         return "StructuredDataContainer{" +

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_14.java

@@ -22,223 +22,232 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_14 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(17, ENTITY),
-    EVOKER_FANGS(21, ENTITY),
-    EXPERIENCE_ORB(23, ENTITY),
-    EYE_OF_ENDER(24, ENTITY),
-    FALLING_BLOCK(25, ENTITY),
-    FIREWORK_ROCKET(26, ENTITY),
-    ITEM(34, ENTITY),
-    LLAMA_SPIT(39, ENTITY),
-    TNT(58, ENTITY),
-    SHULKER_BULLET(63, ENTITY),
-    FISHING_BOBBER(101, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(100, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(18, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(84, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(88, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(13, ABSTRACT_INSENTIENT),
-    CHICKEN(8, ABSTRACT_ANIMAL),
-    COW(10, ABSTRACT_ANIMAL),
-    MOOSHROOM(49, COW),
-    PANDA(52, ABSTRACT_INSENTIENT),
-    PIG(54, ABSTRACT_ANIMAL),
-    POLAR_BEAR(57, ABSTRACT_ANIMAL),
-    RABBIT(59, ABSTRACT_ANIMAL),
-    SHEEP(61, ABSTRACT_ANIMAL),
-    TURTLE(77, ABSTRACT_ANIMAL),
-    FOX(27, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(6, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(50, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(93, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(53, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(12, CHESTED_HORSE),
-    MULE(48, CHESTED_HORSE),
-    LLAMA(38, CHESTED_HORSE),
-    TRADER_LLAMA(75, CHESTED_HORSE),
-    HORSE(31, ABSTRACT_HORSE),
-    SKELETON_HORSE(66, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(95, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(69, ABSTRACT_GOLEM),
-    IRON_GOLEM(85, ABSTRACT_GOLEM),
-    SHULKER(62, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(9, ABSTRACT_FISHES),
-    PUFFERFISH(55, ABSTRACT_FISHES),
-    SALMON(60, ABSTRACT_FISHES),
-    TROPICAL_FISH(76, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(4, ABSTRACT_MONSTER),
-    CREEPER(11, ABSTRACT_MONSTER),
-    ENDERMITE(20, ABSTRACT_MONSTER),
-    ENDERMAN(19, ABSTRACT_MONSTER),
-    GIANT(29, ABSTRACT_MONSTER),
-    SILVERFISH(64, ABSTRACT_MONSTER),
-    VEX(83, ABSTRACT_MONSTER),
-    WITCH(89, ABSTRACT_MONSTER),
-    WITHER(90, ABSTRACT_MONSTER),
-    RAVAGER(98, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(22, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(33, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(86, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(87, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(65, ABSTRACT_SKELETON),
-    STRAY(74, ABSTRACT_SKELETON),
-    WITHER_SKELETON(91, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(30, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(16, GUARDIAN),
-
-    // Spiders
-    SPIDER(72, ABSTRACT_MONSTER),
-    CAVE_SPIDER(7, SPIDER),
-
-    // Zombies - META CHECKED
-    ZOMBIE(94, ABSTRACT_MONSTER),
-    DROWNED(15, ZOMBIE),
-    HUSK(32, ZOMBIE),
-    ZOMBIE_PIGMAN(56, ZOMBIE),
-    ZOMBIE_VILLAGER(96, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(28, ABSTRACT_FLYING),
-    PHANTOM(97, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(73, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(67, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(40, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(37, ABSTRACT_HANGING),
-    ITEM_FRAME(35, ABSTRACT_HANGING),
-    PAINTING(51, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(99, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(71, ABSTRACT_ARROW),
-    TRIDENT(82, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(14, ABSTRACT_FIREBALL),
-    FIREBALL(36, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(68, ABSTRACT_FIREBALL),
-    WITHER_SKULL(92, ABSTRACT_FIREBALL),
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(70, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(79, PROJECTILE_ABSTRACT),
-    EGG(78, PROJECTILE_ABSTRACT),
-    POTION(81, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(80, PROJECTILE_ABSTRACT),
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(42, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(45, CHESTED_MINECART_ABSTRACT),
-    MINECART(41, MINECART_ABSTRACT),
-    FURNACE_MINECART(44, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(43, MINECART_ABSTRACT),
-    TNT_MINECART(47, MINECART_ABSTRACT),
-    SPAWNER_MINECART(46, MINECART_ABSTRACT),
-    BOAT(5, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
 
-    private final int id;
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
+    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
+    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
+    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+
+    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+    SQUID(ABSTRACT_WATERMOB),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
+    PUFFERFISH(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIE_PIGMAN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_14(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_14(final EntityType parent) {
+        this.parent = parent;
+        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
     }
 
-    EntityTypes1_14(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_14(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_15.java

@@ -22,225 +22,233 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_15 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(18, ENTITY),
-    EVOKER_FANGS(22, ENTITY),
-    EXPERIENCE_ORB(24, ENTITY),
-    EYE_OF_ENDER(25, ENTITY),
-    FALLING_BLOCK(26, ENTITY),
-    FIREWORK_ROCKET(27, ENTITY),
-    ITEM(35, ENTITY),
-    LLAMA_SPIT(40, ENTITY),
-    TNT(59, ENTITY),
-    SHULKER_BULLET(64, ENTITY),
-    FISHING_BOBBER(102, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(101, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(19, ABSTRACT_INSENTIENT),
-
-    BEE(4, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(85, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(89, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(14, ABSTRACT_INSENTIENT),
-    CHICKEN(9, ABSTRACT_ANIMAL),
-    COW(11, ABSTRACT_ANIMAL),
-    MOOSHROOM(50, COW),
-    PANDA(53, ABSTRACT_INSENTIENT),
-    PIG(55, ABSTRACT_ANIMAL),
-    POLAR_BEAR(58, ABSTRACT_ANIMAL),
-    RABBIT(60, ABSTRACT_ANIMAL),
-    SHEEP(62, ABSTRACT_ANIMAL),
-    TURTLE(78, ABSTRACT_ANIMAL),
-    FOX(28, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(7, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(51, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(94, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(54, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(13, CHESTED_HORSE),
-    MULE(49, CHESTED_HORSE),
-    LLAMA(39, CHESTED_HORSE),
-    TRADER_LLAMA(76, CHESTED_HORSE),
-    HORSE(32, ABSTRACT_HORSE),
-    SKELETON_HORSE(67, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(96, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(70, ABSTRACT_GOLEM),
-    IRON_GOLEM(86, ABSTRACT_GOLEM),
-    SHULKER(63, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(10, ABSTRACT_FISHES),
-    PUFFERFISH(56, ABSTRACT_FISHES),
-    SALMON(61, ABSTRACT_FISHES),
-    TROPICAL_FISH(77, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(5, ABSTRACT_MONSTER),
-    CREEPER(12, ABSTRACT_MONSTER),
-    ENDERMITE(21, ABSTRACT_MONSTER),
-    ENDERMAN(20, ABSTRACT_MONSTER),
-    GIANT(30, ABSTRACT_MONSTER),
-    SILVERFISH(65, ABSTRACT_MONSTER),
-    VEX(84, ABSTRACT_MONSTER),
-    WITCH(90, ABSTRACT_MONSTER),
-    WITHER(91, ABSTRACT_MONSTER),
-    RAVAGER(99, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(23, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(34, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(87, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(88, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(66, ABSTRACT_SKELETON),
-    STRAY(75, ABSTRACT_SKELETON),
-    WITHER_SKELETON(92, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(31, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(17, GUARDIAN),
-
-    // Spiders
-    SPIDER(73, ABSTRACT_MONSTER),
-    CAVE_SPIDER(8, SPIDER),
-
-    // Zombies
-    ZOMBIE(95, ABSTRACT_MONSTER),
-    DROWNED(16, ZOMBIE),
-    HUSK(33, ZOMBIE),
-    ZOMBIE_PIGMAN(57, ZOMBIE),
-    ZOMBIE_VILLAGER(97, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(29, ABSTRACT_FLYING),
-    PHANTOM(98, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(74, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(68, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(41, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(38, ABSTRACT_HANGING),
-    ITEM_FRAME(36, ABSTRACT_HANGING),
-    PAINTING(52, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(100, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(72, ABSTRACT_ARROW),
-    TRIDENT(83, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(15, ABSTRACT_FIREBALL),
-    FIREBALL(37, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(69, ABSTRACT_FIREBALL),
-    WITHER_SKULL(93, ABSTRACT_FIREBALL),
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(71, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(80, PROJECTILE_ABSTRACT),
-    EGG(79, PROJECTILE_ABSTRACT),
-    POTION(82, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(81, PROJECTILE_ABSTRACT),
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(43, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(46, CHESTED_MINECART_ABSTRACT),
-    MINECART(42, MINECART_ABSTRACT),
-    FURNACE_MINECART(45, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(44, MINECART_ABSTRACT),
-    TNT_MINECART(48, MINECART_ABSTRACT),
-    SPAWNER_MINECART(47, MINECART_ABSTRACT),
-    BOAT(6, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
 
-    private final int id;
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
+    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
+    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
+    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+
+    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+    SQUID(ABSTRACT_WATERMOB),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
+    PUFFERFISH(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIE_PIGMAN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_15(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_15(final EntityType parent) {
+        this.parent = parent;
+        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
     }
 
-    EntityTypes1_15(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_15(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_16.java

@@ -22,230 +22,237 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_16 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(18, ENTITY),
-    EVOKER_FANGS(23, ENTITY),
-    EXPERIENCE_ORB(24, ENTITY),
-    EYE_OF_ENDER(25, ENTITY),
-    FALLING_BLOCK(26, ENTITY),
-    FIREWORK_ROCKET(27, ENTITY),
-    ITEM(37, ENTITY),
-    LLAMA_SPIT(43, ENTITY),
-    TNT(63, ENTITY),
-    SHULKER_BULLET(70, ENTITY),
-    FISHING_BOBBER(106, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(105, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(19, ABSTRACT_INSENTIENT),
-
-    BEE(4, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(92, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(94, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(13, ABSTRACT_INSENTIENT),
-    CHICKEN(9, ABSTRACT_ANIMAL),
-    COW(11, ABSTRACT_ANIMAL),
-    MOOSHROOM(53, COW),
-    PANDA(56, ABSTRACT_INSENTIENT),
-    PIG(59, ABSTRACT_ANIMAL),
-    POLAR_BEAR(62, ABSTRACT_ANIMAL),
-    RABBIT(65, ABSTRACT_ANIMAL),
-    SHEEP(68, ABSTRACT_ANIMAL),
-    TURTLE(90, ABSTRACT_ANIMAL),
-    FOX(28, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(7, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(54, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(99, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(57, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(14, CHESTED_HORSE),
-    MULE(52, CHESTED_HORSE),
-    LLAMA(42, CHESTED_HORSE),
-    TRADER_LLAMA(88, CHESTED_HORSE),
-    HORSE(33, ABSTRACT_HORSE),
-    SKELETON_HORSE(73, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(102, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(76, ABSTRACT_GOLEM),
-    IRON_GOLEM(36, ABSTRACT_GOLEM),
-    SHULKER(69, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(10, ABSTRACT_FISHES),
-    PUFFERFISH(64, ABSTRACT_FISHES),
-    SALMON(67, ABSTRACT_FISHES),
-    TROPICAL_FISH(89, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(5, ABSTRACT_MONSTER),
-    CREEPER(12, ABSTRACT_MONSTER),
-    ENDERMITE(21, ABSTRACT_MONSTER),
-    ENDERMAN(20, ABSTRACT_MONSTER),
-    GIANT(30, ABSTRACT_MONSTER),
-    SILVERFISH(71, ABSTRACT_MONSTER),
-    VEX(91, ABSTRACT_MONSTER),
-    WITCH(95, ABSTRACT_MONSTER),
-    WITHER(96, ABSTRACT_MONSTER),
-    RAVAGER(66, ABSTRACT_MONSTER),
-    PIGLIN(60, ABSTRACT_MONSTER),
-
-    HOGLIN(32, ABSTRACT_ANIMAL),
-    STRIDER(82, ABSTRACT_ANIMAL),
-    ZOGLIN(100, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(22, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(35, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(93, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(61, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(72, ABSTRACT_SKELETON),
-    STRAY(81, ABSTRACT_SKELETON),
-    WITHER_SKELETON(97, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(31, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(17, GUARDIAN),
-
-    // Spiders
-    SPIDER(79, ABSTRACT_MONSTER),
-    CAVE_SPIDER(8, SPIDER),
-
-    // Zombies
-    ZOMBIE(101, ABSTRACT_MONSTER),
-    DROWNED(16, ZOMBIE),
-    HUSK(34, ZOMBIE),
-    ZOMBIFIED_PIGLIN(104, ZOMBIE),
-    ZOMBIE_VILLAGER(103, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(29, ABSTRACT_FLYING),
-    PHANTOM(58, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(80, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(74, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(44, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(40, ABSTRACT_HANGING),
-    ITEM_FRAME(38, ABSTRACT_HANGING),
-    PAINTING(55, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(41, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(78, ABSTRACT_ARROW),
-    TRIDENT(87, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(15, ABSTRACT_FIREBALL),
-    FIREBALL(39, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(75, ABSTRACT_FIREBALL),
-    WITHER_SKULL(98, ABSTRACT_FIREBALL),
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(77, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(84, PROJECTILE_ABSTRACT),
-    EGG(83, PROJECTILE_ABSTRACT),
-    POTION(86, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(85, PROJECTILE_ABSTRACT),
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(46, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(49, CHESTED_MINECART_ABSTRACT),
-    MINECART(45, MINECART_ABSTRACT),
-    FURNACE_MINECART(48, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(47, MINECART_ABSTRACT),
-    TNT_MINECART(51, MINECART_ABSTRACT),
-    SPAWNER_MINECART(50, MINECART_ABSTRACT),
-    BOAT(6, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
 
-    private final int id;
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
+    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
+    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
+    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+
+    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+    SQUID(ABSTRACT_WATERMOB),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
+    PUFFERFISH(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+    PIGLIN(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_16(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_16(final EntityType parent) {
+        this.parent = parent;
+        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
     }
 
-    EntityTypes1_16(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_16(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_16_2.java

@@ -22,234 +22,240 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_16_2 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(18, ENTITY),
-    EVOKER_FANGS(23, ENTITY),
-    EXPERIENCE_ORB(24, ENTITY),
-    EYE_OF_ENDER(25, ENTITY),
-    FALLING_BLOCK(26, ENTITY),
-    FIREWORK_ROCKET(27, ENTITY),
-    ITEM(37, ENTITY),
-    LLAMA_SPIT(43, ENTITY),
-    TNT(64, ENTITY),
-    SHULKER_BULLET(71, ENTITY),
-    FISHING_BOBBER(107, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(106, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(19, ABSTRACT_INSENTIENT),
-
-    BEE(4, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(93, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(95, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(13, ABSTRACT_INSENTIENT),
-    CHICKEN(9, ABSTRACT_ANIMAL),
-    COW(11, ABSTRACT_ANIMAL),
-    MOOSHROOM(53, COW),
-    PANDA(56, ABSTRACT_INSENTIENT),
-    PIG(59, ABSTRACT_ANIMAL),
-    POLAR_BEAR(63, ABSTRACT_ANIMAL),
-    RABBIT(66, ABSTRACT_ANIMAL),
-    SHEEP(69, ABSTRACT_ANIMAL),
-    TURTLE(91, ABSTRACT_ANIMAL),
-    FOX(28, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(7, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(54, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(100, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(57, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(14, CHESTED_HORSE),
-    MULE(52, CHESTED_HORSE),
-    LLAMA(42, CHESTED_HORSE),
-    TRADER_LLAMA(89, CHESTED_HORSE),
-    HORSE(33, ABSTRACT_HORSE),
-    SKELETON_HORSE(74, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(103, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(77, ABSTRACT_GOLEM),
-    IRON_GOLEM(36, ABSTRACT_GOLEM),
-    SHULKER(70, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(10, ABSTRACT_FISHES),
-    PUFFERFISH(65, ABSTRACT_FISHES),
-    SALMON(68, ABSTRACT_FISHES),
-    TROPICAL_FISH(90, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(5, ABSTRACT_MONSTER),
-    CREEPER(12, ABSTRACT_MONSTER),
-    ENDERMITE(21, ABSTRACT_MONSTER),
-    ENDERMAN(20, ABSTRACT_MONSTER),
-    GIANT(30, ABSTRACT_MONSTER),
-    SILVERFISH(72, ABSTRACT_MONSTER),
-    VEX(92, ABSTRACT_MONSTER),
-    WITCH(96, ABSTRACT_MONSTER),
-    WITHER(97, ABSTRACT_MONSTER),
-    RAVAGER(67, ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(-1, ABSTRACT_MONSTER),
-
-    PIGLIN(60, ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(61, ABSTRACT_PIGLIN),
-
-    HOGLIN(32, ABSTRACT_ANIMAL),
-    STRIDER(83, ABSTRACT_ANIMAL),
-    ZOGLIN(101, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(22, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(35, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(94, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(62, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(73, ABSTRACT_SKELETON),
-    STRAY(82, ABSTRACT_SKELETON),
-    WITHER_SKELETON(98, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(31, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(17, GUARDIAN),
-
-    // Spiders
-    SPIDER(80, ABSTRACT_MONSTER),
-    CAVE_SPIDER(8, SPIDER),
-
-    // Zombies
-    ZOMBIE(102, ABSTRACT_MONSTER),
-    DROWNED(16, ZOMBIE),
-    HUSK(34, ZOMBIE),
-    ZOMBIFIED_PIGLIN(105, ZOMBIE),
-    ZOMBIE_VILLAGER(104, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(29, ABSTRACT_FLYING),
-    PHANTOM(58, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(81, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(75, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(44, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(40, ABSTRACT_HANGING),
-    ITEM_FRAME(38, ABSTRACT_HANGING),
-    PAINTING(55, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(41, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(79, ABSTRACT_ARROW),
-    TRIDENT(88, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(15, ABSTRACT_FIREBALL),
-    FIREBALL(39, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(76, ABSTRACT_FIREBALL),
-    WITHER_SKULL(99, ABSTRACT_FIREBALL),
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(78, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(85, PROJECTILE_ABSTRACT),
-    EGG(84, PROJECTILE_ABSTRACT),
-    POTION(87, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(86, PROJECTILE_ABSTRACT),
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(46, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(49, CHESTED_MINECART_ABSTRACT),
-    MINECART(45, MINECART_ABSTRACT),
-    FURNACE_MINECART(48, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(47, MINECART_ABSTRACT),
-    TNT_MINECART(51, MINECART_ABSTRACT),
-    SPAWNER_MINECART(50, MINECART_ABSTRACT),
-    BOAT(6, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
 
-    private final int id;
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
+    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
+    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
+    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+
+    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+    SQUID(ABSTRACT_WATERMOB),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
+    PUFFERFISH(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_16_2(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_16_2(final EntityType parent) {
+        this.parent = parent;
+        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
     }
 
-    EntityTypes1_16_2(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_16_2(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
-}
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_17.java

@@ -22,239 +22,246 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_17 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(19, ENTITY),
-    EVOKER_FANGS(24, ENTITY),
-    EXPERIENCE_ORB(25, ENTITY),
-    EYE_OF_ENDER(26, ENTITY),
-    FALLING_BLOCK(27, ENTITY),
-    FIREWORK_ROCKET(28, ENTITY),
-    ITEM(41, ENTITY),
-    LLAMA_SPIT(47, ENTITY),
-    TNT(69, ENTITY),
-    SHULKER_BULLET(76, ENTITY),
-    FISHING_BOBBER(112, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    MARKER(49, ENTITY),
-    PLAYER(111, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(20, ABSTRACT_INSENTIENT),
-
-    BEE(5, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(98, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(100, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    AXOLOTL(3, ABSTRACT_ANIMAL),
-    DOLPHIN(14, ABSTRACT_INSENTIENT),
-    CHICKEN(10, ABSTRACT_ANIMAL),
-    COW(12, ABSTRACT_ANIMAL),
-    MOOSHROOM(58, COW),
-    PANDA(61, ABSTRACT_INSENTIENT),
-    PIG(64, ABSTRACT_ANIMAL),
-    POLAR_BEAR(68, ABSTRACT_ANIMAL),
-    RABBIT(71, ABSTRACT_ANIMAL),
-    SHEEP(74, ABSTRACT_ANIMAL),
-    TURTLE(96, ABSTRACT_ANIMAL),
-    FOX(29, ABSTRACT_ANIMAL),
-    GOAT(34, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(8, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(59, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(105, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(62, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(15, CHESTED_HORSE),
-    MULE(57, CHESTED_HORSE),
-    LLAMA(46, CHESTED_HORSE),
-    TRADER_LLAMA(94, CHESTED_HORSE),
-    HORSE(37, ABSTRACT_HORSE),
-    SKELETON_HORSE(79, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(108, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(82, ABSTRACT_GOLEM),
-    IRON_GOLEM(40, ABSTRACT_GOLEM),
-    SHULKER(75, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(11, ABSTRACT_FISHES),
-    PUFFERFISH(70, ABSTRACT_FISHES),
-    SALMON(73, ABSTRACT_FISHES),
-    TROPICAL_FISH(95, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(6, ABSTRACT_MONSTER),
-    CREEPER(13, ABSTRACT_MONSTER),
-    ENDERMITE(22, ABSTRACT_MONSTER),
-    ENDERMAN(21, ABSTRACT_MONSTER),
-    GIANT(31, ABSTRACT_MONSTER),
-    SILVERFISH(77, ABSTRACT_MONSTER),
-    VEX(97, ABSTRACT_MONSTER),
-    WITCH(101, ABSTRACT_MONSTER),
-    WITHER(102, ABSTRACT_MONSTER),
-    RAVAGER(72, ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(-1, ABSTRACT_MONSTER),
-
-    PIGLIN(65, ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(66, ABSTRACT_PIGLIN),
-
-    HOGLIN(36, ABSTRACT_ANIMAL),
-    STRIDER(88, ABSTRACT_ANIMAL),
-    ZOGLIN(106, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(23, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(39, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(99, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(67, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(78, ABSTRACT_SKELETON),
-    STRAY(87, ABSTRACT_SKELETON),
-    WITHER_SKELETON(103, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(35, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(18, GUARDIAN),
-
-    // Spiders
-    SPIDER(85, ABSTRACT_MONSTER),
-    CAVE_SPIDER(9, SPIDER),
-
-    // Zombies
-    ZOMBIE(107, ABSTRACT_MONSTER),
-    DROWNED(17, ZOMBIE),
-    HUSK(38, ZOMBIE),
-    ZOMBIFIED_PIGLIN(110, ZOMBIE),
-    ZOMBIE_VILLAGER(109, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(30, ABSTRACT_FLYING),
-    PHANTOM(63, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(4, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(86, ABSTRACT_WATERMOB),
-    GLOW_SQUID(33, SQUID),
-
-    // Slimes
-    SLIME(80, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(48, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(44, ABSTRACT_HANGING),
-    ITEM_FRAME(42, ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(32, ITEM_FRAME),
-    PAINTING(60, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(45, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(84, ABSTRACT_ARROW),
-    TRIDENT(93, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(16, ABSTRACT_FIREBALL),
-    FIREBALL(43, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(81, ABSTRACT_FIREBALL),
-    WITHER_SKULL(104, ABSTRACT_FIREBALL),
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(83, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(90, PROJECTILE_ABSTRACT),
-    EGG(89, PROJECTILE_ABSTRACT),
-    POTION(92, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(91, PROJECTILE_ABSTRACT),
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(51, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(54, CHESTED_MINECART_ABSTRACT),
-    MINECART(50, MINECART_ABSTRACT),
-    FURNACE_MINECART(53, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(52, MINECART_ABSTRACT),
-    TNT_MINECART(56, MINECART_ABSTRACT),
-    SPAWNER_MINECART(55, MINECART_ABSTRACT),
-    BOAT(7, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
 
-    private final int id;
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
+    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
+    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
+    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+
+    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+
+    SQUID(ABSTRACT_WATERMOB),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
+    PUFFERFISH(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_17(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_17(final EntityType parent) {
+        this.parent = parent;
+        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
     }
 
-    EntityTypes1_17(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_17(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_19.java

@@ -38,77 +38,144 @@ public enum EntityTypes1_19 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
+    CHEST_BOAT(BOAT),
+
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
     LIVINGENTITY(ENTITY, null),
     ARMOR_STAND(LIVINGENTITY),
-    MARKER(ENTITY),
     PLAYER(LIVINGENTITY),
 
+    // Mobs as a larger subclass
     ABSTRACT_INSENTIENT(LIVINGENTITY, null),
     ENDER_DRAGON(ABSTRACT_INSENTIENT),
 
-    BEE(ABSTRACT_INSENTIENT),
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
 
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
     ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ALLAY(ABSTRACT_CREATURE),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
-    AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
-    CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
-    PIG(ABSTRACT_ANIMAL),
-    POLAR_BEAR(ABSTRACT_ANIMAL),
-    RABBIT(ABSTRACT_ANIMAL),
-    SHEEP(ABSTRACT_ANIMAL),
-    TURTLE(ABSTRACT_ANIMAL),
-    FOX(ABSTRACT_ANIMAL),
-    FROG(ABSTRACT_ANIMAL),
-    GOAT(ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
-    HORSE(ABSTRACT_HORSE),
-    SKELETON_HORSE(ABSTRACT_HORSE),
-    ZOMBIE_HORSE(ABSTRACT_HORSE),
-
-    // Golem
     ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
     SNOW_GOLEM(ABSTRACT_GOLEM),
     IRON_GOLEM(ABSTRACT_GOLEM),
     SHULKER(ABSTRACT_GOLEM),
 
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+
+    SQUID(ABSTRACT_WATERMOB),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
     PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    TADPOLE(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
     ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
@@ -119,110 +186,42 @@ public enum EntityTypes1_19 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_19_3.java

@@ -38,78 +38,145 @@ public enum EntityTypes1_19_3 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
+    CHEST_BOAT(BOAT),
+
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
     LIVINGENTITY(ENTITY, null),
     ARMOR_STAND(LIVINGENTITY),
-    MARKER(ENTITY),
     PLAYER(LIVINGENTITY),
 
+    // Mobs as a larger subclass
     ABSTRACT_INSENTIENT(LIVINGENTITY, null),
     ENDER_DRAGON(ABSTRACT_INSENTIENT),
 
-    BEE(ABSTRACT_INSENTIENT),
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
 
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
     ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ALLAY(ABSTRACT_CREATURE),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
-    AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
-    CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
-    PIG(ABSTRACT_ANIMAL),
-    POLAR_BEAR(ABSTRACT_ANIMAL),
-    RABBIT(ABSTRACT_ANIMAL),
-    SHEEP(ABSTRACT_ANIMAL),
-    TURTLE(ABSTRACT_ANIMAL),
-    FOX(ABSTRACT_ANIMAL),
-    FROG(ABSTRACT_ANIMAL),
-    GOAT(ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
-    HORSE(ABSTRACT_HORSE),
-    SKELETON_HORSE(ABSTRACT_HORSE),
-    ZOMBIE_HORSE(ABSTRACT_HORSE),
-    CAMEL(ABSTRACT_HORSE),
-
-    // Golem
     ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
     SNOW_GOLEM(ABSTRACT_GOLEM),
     IRON_GOLEM(ABSTRACT_GOLEM),
     SHULKER(ABSTRACT_GOLEM),
 
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+
+    SQUID(ABSTRACT_WATERMOB),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
     PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    TADPOLE(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
     ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
@@ -120,110 +187,42 @@ public enum EntityTypes1_19_3 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_19_4.java

@@ -38,85 +38,152 @@ public enum EntityTypes1_19_4 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
-
-    LIVINGENTITY(ENTITY, null),
-    ARMOR_STAND(LIVINGENTITY),
     MARKER(ENTITY),
-    PLAYER(LIVINGENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
 
     DISPLAY(ENTITY, null),
     BLOCK_DISPLAY(DISPLAY),
     ITEM_DISPLAY(DISPLAY),
     TEXT_DISPLAY(DISPLAY),
-    INTERACTION(ENTITY),
 
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
+    CHEST_BOAT(BOAT),
+
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
     ABSTRACT_INSENTIENT(LIVINGENTITY, null),
     ENDER_DRAGON(ABSTRACT_INSENTIENT),
 
-    BEE(ABSTRACT_INSENTIENT),
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
 
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
     ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ALLAY(ABSTRACT_CREATURE),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
-    AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
-    CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
-    PIG(ABSTRACT_ANIMAL),
-    POLAR_BEAR(ABSTRACT_ANIMAL),
-    RABBIT(ABSTRACT_ANIMAL),
-    SHEEP(ABSTRACT_ANIMAL),
-    TURTLE(ABSTRACT_ANIMAL),
-    FOX(ABSTRACT_ANIMAL),
-    FROG(ABSTRACT_ANIMAL),
-    GOAT(ABSTRACT_ANIMAL),
-    SNIFFER(ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
-    HORSE(ABSTRACT_HORSE),
-    SKELETON_HORSE(ABSTRACT_HORSE),
-    ZOMBIE_HORSE(ABSTRACT_HORSE),
-    CAMEL(ABSTRACT_HORSE),
-
-    // Golem
     ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
     SNOW_GOLEM(ABSTRACT_GOLEM),
     IRON_GOLEM(ABSTRACT_GOLEM),
     SHULKER(ABSTRACT_GOLEM),
 
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+
+    SQUID(ABSTRACT_WATERMOB),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
     PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    TADPOLE(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+    SNIFFER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
     ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
@@ -127,110 +194,42 @@ public enum EntityTypes1_19_4 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_20_3.java

@@ -38,85 +38,153 @@ public enum EntityTypes1_20_3 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
-
-    LIVINGENTITY(ENTITY, null),
-    ARMOR_STAND(LIVINGENTITY),
     MARKER(ENTITY),
-    PLAYER(LIVINGENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
 
     DISPLAY(ENTITY, null),
     BLOCK_DISPLAY(DISPLAY),
     ITEM_DISPLAY(DISPLAY),
     TEXT_DISPLAY(DISPLAY),
-    INTERACTION(ENTITY),
 
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+    WIND_CHARGE(PROJECTILE_ABSTRACT),
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
+    CHEST_BOAT(BOAT),
+
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
     ABSTRACT_INSENTIENT(LIVINGENTITY, null),
     ENDER_DRAGON(ABSTRACT_INSENTIENT),
 
-    BEE(ABSTRACT_INSENTIENT),
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
 
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
     ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ALLAY(ABSTRACT_CREATURE),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
-    AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
-    CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
-    PIG(ABSTRACT_ANIMAL),
-    POLAR_BEAR(ABSTRACT_ANIMAL),
-    RABBIT(ABSTRACT_ANIMAL),
-    SHEEP(ABSTRACT_ANIMAL),
-    TURTLE(ABSTRACT_ANIMAL),
-    FOX(ABSTRACT_ANIMAL),
-    FROG(ABSTRACT_ANIMAL),
-    GOAT(ABSTRACT_ANIMAL),
-    SNIFFER(ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
-    HORSE(ABSTRACT_HORSE),
-    SKELETON_HORSE(ABSTRACT_HORSE),
-    ZOMBIE_HORSE(ABSTRACT_HORSE),
-    CAMEL(ABSTRACT_HORSE),
-
-    // Golem
     ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
     SNOW_GOLEM(ABSTRACT_GOLEM),
     IRON_GOLEM(ABSTRACT_GOLEM),
     SHULKER(ABSTRACT_GOLEM),
 
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+
+    SQUID(ABSTRACT_WATERMOB),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
     PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    TADPOLE(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+    SNIFFER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
     ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
@@ -127,112 +195,43 @@ public enum EntityTypes1_20_3 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
     BREEZE(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-    WIND_CHARGE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -38,87 +38,158 @@ public enum EntityTypes1_20_5 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
     OMINOUS_ITEM_SPAWNER(ENTITY),
-
-    LIVINGENTITY(ENTITY, null),
-    ARMOR_STAND(LIVINGENTITY),
     MARKER(ENTITY),
-    PLAYER(LIVINGENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
 
     DISPLAY(ENTITY, null),
     BLOCK_DISPLAY(DISPLAY),
     ITEM_DISPLAY(DISPLAY),
     TEXT_DISPLAY(DISPLAY),
-    INTERACTION(ENTITY),
 
+    // Hanging entities
+    ABSTRACT_HANGING(ENTITY, null),
+    LEASH_KNOT(ABSTRACT_HANGING),
+    PAINTING(ABSTRACT_HANGING),
+    ITEM_FRAME(ABSTRACT_HANGING),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE_ABSTRACT(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE_ABSTRACT),
+    ENDER_PEARL(PROJECTILE_ABSTRACT),
+    EGG(PROJECTILE_ABSTRACT),
+    POTION(PROJECTILE_ABSTRACT),
+    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
+    FIREWORK_ROCKET(PROJECTILE_ABSTRACT),
+    LLAMA_SPIT(PROJECTILE_ABSTRACT),
+    SHULKER_BULLET(PROJECTILE_ABSTRACT),
+    FISHING_BOBBER(PROJECTILE_ABSTRACT),
+    WITHER_SKULL(PROJECTILE_ABSTRACT),
+    DRAGON_FIREBALL(PROJECTILE_ABSTRACT), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE_ABSTRACT, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    ABSTRACT_WIND_CHARGE(PROJECTILE_ABSTRACT, null),
+    WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+    BREEZE_WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    MINECART_ABSTRACT(VEHICLE, null),
+    MINECART(MINECART_ABSTRACT),
+    FURNACE_MINECART(MINECART_ABSTRACT),
+    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
+    TNT_MINECART(MINECART_ABSTRACT),
+    SPAWNER_MINECART(MINECART_ABSTRACT),
+    CHEST_BOAT(BOAT),
+
+    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
+    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
+    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
+
+    // Living entities as a larger subclass
+    LIVINGENTITY(ENTITY, null),
+    ARMOR_STAND(LIVINGENTITY),
+    PLAYER(LIVINGENTITY),
+
+    // Mobs as a larger subclass
     ABSTRACT_INSENTIENT(LIVINGENTITY, null),
     ENDER_DRAGON(ABSTRACT_INSENTIENT),
 
-    BEE(ABSTRACT_INSENTIENT),
+    SLIME(ABSTRACT_INSENTIENT),
+    MAGMA_CUBE(SLIME),
 
+    // Ambient mobs
+    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
+    BAT(ABSTRACT_AMBIENT),
+
+    // Flying mobs
+    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
+    GHAST(ABSTRACT_FLYING),
+    PHANTOM(ABSTRACT_FLYING),
+
+    // Pathfinder mobs and its subclasses
     ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ALLAY(ABSTRACT_CREATURE),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
-    AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
-    CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
-    PIG(ABSTRACT_ANIMAL),
-    POLAR_BEAR(ABSTRACT_ANIMAL),
-    RABBIT(ABSTRACT_ANIMAL),
-    SHEEP(ABSTRACT_ANIMAL),
-    TURTLE(ABSTRACT_ANIMAL),
-    FOX(ABSTRACT_ANIMAL),
-    FROG(ABSTRACT_ANIMAL),
-    GOAT(ABSTRACT_ANIMAL),
-    SNIFFER(ABSTRACT_ANIMAL),
-    ARMADILLO(ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(LLAMA),
-    HORSE(ABSTRACT_HORSE),
-    SKELETON_HORSE(ABSTRACT_HORSE),
-    ZOMBIE_HORSE(ABSTRACT_HORSE),
-    CAMEL(ABSTRACT_HORSE),
-
-    // Golem
     ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
     SNOW_GOLEM(ABSTRACT_GOLEM),
     IRON_GOLEM(ABSTRACT_GOLEM),
     SHULKER(ABSTRACT_GOLEM),
 
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
+    // Water mobs
+    ABSTRACT_WATERMOB(ABSTRACT_CREATURE, null),
+    DOLPHIN(ABSTRACT_WATERMOB),
+
+    SQUID(ABSTRACT_WATERMOB),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISHES(ABSTRACT_WATERMOB, null),
     PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    TADPOLE(ABSTRACT_FISHES),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISHES, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+    SNIFFER(ABSTRACT_ANIMAL),
+    ARMADILLO(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(ABSTRACT_TAMEABLE_ANIMAL),
+    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
+    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    PARROT(ABSTRACT_TAMEABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(CHESTED_HORSE),
+    MULE(CHESTED_HORSE),
+    LLAMA(CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
     ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
@@ -129,115 +200,44 @@ public enum EntityTypes1_20_5 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
     BREEZE(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
     BOGGED(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-    ABSTRACT_WIND_CHARGE(PROJECTILE_ABSTRACT, null),
-    WIND_CHARGE(ABSTRACT_WIND_CHARGE),
-    BREEZE_WIND_CHARGE(ABSTRACT_WIND_CHARGE),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER_BASE(ABSTRACT_RAIDER, null),
+    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
+    VINDICATOR(ABSTRACT_ILLAGER_BASE),
+    PILLAGER(ABSTRACT_ILLAGER_BASE),
+    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
+    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;

api/src/main/java/com/viaversion/viaversion/api/minecraft/metadata/types/MetaTypes1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal

api/src/main/java/com/viaversion/viaversion/api/type/types/item/ItemType1_20_5.java

@@ -62,7 +62,7 @@ public class ItemType1_20_5 extends Type<Item> {
             return new Reference2ObjectOpenHashMap<>();
         }
 
-        final Map<StructuredDataKey<?>, StructuredData<?>> map = new Reference2ObjectOpenHashMap<>(valuesSize + markersSize);
+        final Map<StructuredDataKey<?>, StructuredData<?>> map = new Reference2ObjectOpenHashMap<>();
         for (int i = 0; i < valuesSize; i++) {
             final StructuredData<?> value = dataType.read(buffer);
             final StructuredDataKey<?> key = dataType.key(value.id());

api/src/main/java/com/viaversion/viaversion/api/type/types/item/StructuredDataType.java

@@ -79,10 +79,10 @@ public class StructuredDataType extends Type<StructuredData<?>> {
             types = new StructuredDataKey[mappings.mappedSize()];
         }
 
-        public DataFiller add(final StructuredDataKey<?> reader) {
-            final int id = mappings.mappedId(reader.identifier());
-            Preconditions.checkArgument(id != -1, "No mapped id found for %s", reader.identifier());
-            types[id] = reader;
+        public DataFiller add(final StructuredDataKey<?> key) {
+            final int id = mappings.mappedId(key.identifier());
+            Preconditions.checkArgument(id != -1, "No mapped id found for %s", key.identifier());
+            types[id] = key;
             return this;
         }
     }

api/src/main/java/com/viaversion/viaversion/api/type/types/misc/DynamicType.java

@@ -22,6 +22,7 @@
  */
 package com.viaversion.viaversion.api.type.types.misc;
 
+import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.data.FullMappings;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.type.Type;
@@ -58,6 +59,10 @@ public abstract class DynamicType<T extends IdHolder> extends Type<T> {
         }
     }
 
+    public RawDataFiller rawFiller() {
+        return new RawDataFiller();
+    }
+
     public final class DataFiller {
 
         private final FullMappings mappings;
@@ -65,6 +70,7 @@ public abstract class DynamicType<T extends IdHolder> extends Type<T> {
 
         private DataFiller(final Protocol<?, ?, ?, ?> protocol, final boolean useMappedNames) {
             this.mappings = mappings(protocol);
+            Preconditions.checkNotNull(mappings, "Mappings for %s are null", protocol.getClass());
             this.useMappedNames = useMappedNames;
         }
 
@@ -72,8 +78,11 @@ public abstract class DynamicType<T extends IdHolder> extends Type<T> {
             readers.put(useMappedNames ? mappings.mappedId(identifier) : mappings.id(identifier), reader);
             return this;
         }
+    }
 
-        public DataFiller reader(final int id, final DataReader<T> reader) {
+    public final class RawDataFiller {
+
+        public RawDataFiller reader(final int id, final DataReader<T> reader) {
             readers.put(id, reader);
             return this;
         }

api/src/main/java/com/viaversion/viaversion/api/type/types/version/Types1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal

api/src/main/java/com/viaversion/viaversion/util/EntityTypeUtil.java

@@ -24,6 +24,7 @@ package com.viaversion.viaversion.util;
 
 import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.data.FullMappings;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import java.util.ArrayList;
@@ -62,16 +63,21 @@ public final class EntityTypeUtil {
      * @param <T>         entity type
      */
     public static <T extends EntityType> void initialize(final T[] values, final EntityType[] typesToFill, final Protocol<?, ?, ?, ?> protocol, final EntityIdSetter<T> idSetter) {
+        final FullMappings mappings = protocol.getMappingData().getEntityMappings();
         for (final T type : values) {
             if (type.isAbstractType()) {
                 continue;
             }
 
-            final int id = protocol.getMappingData().getEntityMappings().mappedId(type.identifier());
+            final int id = mappings.mappedId(type.identifier());
             Preconditions.checkArgument(id != -1, "Entity type %s has no id", type.identifier());
             idSetter.setId(type, id);
             typesToFill[id] = type;
         }
+
+        if (typesToFill.length != mappings.mappedSize()) {
+            throw new IllegalArgumentException("typesToFill length doesn't match the amount of entity types: " + typesToFill.length + " != " + mappings.size());
+        }
     }
 
     public static EntityType[] createSizedArray(final EntityType[] values) {

bukkit-legacy/src/main/java/com/viaversion/viaversion/bukkit/listeners/protocol1_9to1_8/DeathListener.java

@@ -24,6 +24,7 @@ import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
 import com.viaversion.viaversion.protocols.protocol1_9to1_8.ClientboundPackets1_9;
 import com.viaversion.viaversion.protocols.protocol1_9to1_8.Protocol1_9To1_8;
+import com.viaversion.viaversion.util.ComponentUtil;
 import org.bukkit.World;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
@@ -58,12 +59,12 @@ public class DeathListener extends ViaBukkitListener {
             // If online
             UserConnection userConnection = getUserConnection(p);
             if (userConnection != null) {
-                PacketWrapper wrapper = PacketWrapper.create(ClientboundPackets1_9.COMBAT_EVENT, null, userConnection);
+                PacketWrapper wrapper = PacketWrapper.create(ClientboundPackets1_9.COMBAT_EVENT, userConnection);
                 try {
                     wrapper.write(Type.VAR_INT, 2); // Event - Entity dead
                     wrapper.write(Type.VAR_INT, p.getEntityId()); // Player ID
                     wrapper.write(Type.INT, p.getEntityId()); // Entity ID
-                    Protocol1_9To1_8.STRING_TO_JSON.write(wrapper, msg); // Message
+                    wrapper.write(Type.COMPONENT, ComponentUtil.plainToJson(msg)); // Message
 
                     wrapper.scheduleSend(Protocol1_9To1_8.class);
                 } catch (Exception e) {

common/build.gradle.kts

@@ -22,4 +22,4 @@ tasks.named<Jar>("sourcesJar") {
     from(project(":viaversion-api").sourceSets.main.get().allSource)
 }
 
-publishShadowJar()
+publishShadowJar()

common/src/main/java/com/viaversion/viaversion/protocols/base/BaseProtocol1_7.java

@@ -23,6 +23,7 @@ import com.google.gson.JsonObject;
 import com.google.gson.JsonParseException;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.connection.ProtocolInfo;
+import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.protocol.ProtocolPathEntry;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
@@ -158,20 +159,22 @@ public class BaseProtocol1_7 extends AbstractProtocol<BaseClientboundPacket, Bas
 
         // Login Start Packet
         registerServerbound(ServerboundLoginPackets.HELLO, wrapper -> {
-            ProtocolVersion protocol = wrapper.user().getProtocolInfo().protocolVersion();
+            final UserConnection user = wrapper.user();
+            final ProtocolVersion protocol = user.getProtocolInfo().protocolVersion();
             if (Via.getConfig().blockedProtocolVersions().contains(protocol)) {
-                if (!wrapper.user().getChannel().isOpen()) return;
-                if (!wrapper.user().shouldApplyBlockProtocol()) return;
+                if (!user.getChannel().isOpen() || !user.shouldApplyBlockProtocol()) {
+                    return;
+                }
 
-                final String disconnectMessage = ChatColorUtil.translateAlternateColorCodes(Via.getConfig().getBlockedDisconnectMsg());
-
-                PacketWrapper disconnectPacket = PacketWrapper.create(ClientboundLoginPackets.LOGIN_DISCONNECT, wrapper.user()); // Disconnect Packet
-                wrapper.write(Type.COMPONENT, ComponentUtil.plainToJson(disconnectMessage));
                 wrapper.cancel(); // cancel current
 
+                final String disconnectMessage = ChatColorUtil.translateAlternateColorCodes(Via.getConfig().getBlockedDisconnectMsg());
+                final PacketWrapper disconnectPacket = PacketWrapper.create(ClientboundLoginPackets.LOGIN_DISCONNECT, user);
+                disconnectPacket.write(Type.COMPONENT, ComponentUtil.plainToJson(disconnectMessage));
+
                 // Send and close
-                ChannelFuture future = disconnectPacket.sendFuture(null);
-                future.addListener(f -> wrapper.user().getChannel().close());
+                final ChannelFuture future = disconnectPacket.sendFuture(null);
+                future.addListener(f -> user.getChannel().close());
             }
         });
 

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/Protocol1_13To1_12_2.java

@@ -845,7 +845,7 @@ public class Protocol1_13To1_12_2 extends AbstractProtocol<ClientboundPackets1_1
         RecipeData.init();
         BlockIdData.init();
 
-        Types1_13.PARTICLE.filler(this)
+        Types1_13.PARTICLE.rawFiller()
                 .reader(3, ParticleType.Readers.BLOCK)
                 .reader(20, ParticleType.Readers.DUST)
                 .reader(11, ParticleType.Readers.DUST)

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_14to1_13_2/Protocol1_14To1_13_2.java

@@ -19,6 +19,7 @@ package com.viaversion.viaversion.protocols.protocol1_14to1_13_2;
 
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_14;
 import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
@@ -145,6 +146,7 @@ public class Protocol1_14To1_13_2 extends AbstractProtocol<ClientboundPackets1_1
         WorldPackets.voidAir = MAPPINGS.getBlockStateMappings().getNewId(8591);
         WorldPackets.caveAir = MAPPINGS.getBlockStateMappings().getNewId(8592);
 
+        EntityTypes1_14.initialize(this);
         Types1_13_2.PARTICLE.filler(this, false)
                 .reader("block", ParticleType.Readers.BLOCK)
                 .reader("dust", ParticleType.Readers.DUST)

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_14to1_13_2/metadata/MetadataRewriter1_14To1_13_2.java

@@ -38,13 +38,6 @@ public class MetadataRewriter1_14To1_13_2 extends EntityRewriter<ClientboundPack
 
     public MetadataRewriter1_14To1_13_2(Protocol1_14To1_13_2 protocol) {
         super(protocol);
-        mapTypes(EntityTypes1_13.EntityType.values(), EntityTypes1_14.class);
-
-        if (Via.getConfig().translateOcelotToCat()) {
-            // A better solution for this would be to despawn the ocelot and spawn a cat in its place, but that would
-            // require a lot of data tracking and is not worth the effort.
-            mapEntityType(EntityTypes1_13.EntityType.OCELOT, EntityTypes1_14.CAT);
-        }
     }
 
     @Override
@@ -184,6 +177,16 @@ public class MetadataRewriter1_14To1_13_2 extends EntityRewriter<ClientboundPack
         });
     }
 
+    @Override
+    public void onMappingDataLoaded() {
+        mapTypes();
+        if (Via.getConfig().translateOcelotToCat()) {
+            // A better solution for this would be to despawn the ocelot and spawn a cat in its place, but that would
+            // require a lot of data tracking and is not worth the effort.
+            mapEntityType(EntityTypes1_13.EntityType.OCELOT, EntityTypes1_14.CAT);
+        }
+    }
+
     @Override
     public EntityType typeFromId(int type) {
         return EntityTypes1_14.getTypeFromId(type);

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_15to1_14_4/Protocol1_15To1_14_4.java

@@ -68,6 +68,8 @@ public class Protocol1_15To1_14_4 extends AbstractProtocol<ClientboundPackets1_1
     protected void onMappingDataLoaded() {
         super.onMappingDataLoaded();
 
+        EntityTypes1_15.initialize(this);
+
         int[] shulkerBoxes = new int[17];
         int shulkerBoxOffset = 501;
         for (int i = 0; i < 17; i++) {

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16_2to1_16_1/Protocol1_16_2To1_16_1.java

@@ -86,6 +86,8 @@ public class Protocol1_16_2To1_16_1 extends AbstractProtocol<ClientboundPackets1
     protected void onMappingDataLoaded() {
         super.onMappingDataLoaded();
 
+        EntityTypes1_16_2.initialize(this);
+
         tagRewriter.addTag(RegistryType.ITEM, "minecraft:stone_crafting_materials", 14, 962);
         tagRewriter.addEmptyTag(RegistryType.BLOCK, "minecraft:mushroom_grow_block");
 

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16_2to1_16_1/metadata/MetadataRewriter1_16_2To1_16_1.java

@@ -18,7 +18,6 @@
 package com.viaversion.viaversion.protocols.protocol1_16_2to1_16_1.metadata;
 
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_16;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_16_2;
 import com.viaversion.viaversion.api.type.types.version.Types1_16;
 import com.viaversion.viaversion.protocols.protocol1_16_2to1_16_1.Protocol1_16_2To1_16_1;
@@ -29,7 +28,6 @@ public class MetadataRewriter1_16_2To1_16_1 extends EntityRewriter<ClientboundPa
 
     public MetadataRewriter1_16_2To1_16_1(Protocol1_16_2To1_16_1 protocol) {
         super(protocol);
-        mapTypes(EntityTypes1_16.values(), EntityTypes1_16_2.class);
     }
 
     @Override
@@ -48,6 +46,11 @@ public class MetadataRewriter1_16_2To1_16_1 extends EntityRewriter<ClientboundPa
         });
     }
 
+    @Override
+    public void onMappingDataLoaded() {
+        mapTypes();
+    }
+
     @Override
     public EntityType typeFromId(int type) {
         return EntityTypes1_16_2.getTypeFromId(type);

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16to1_15_2/Protocol1_16To1_15_2.java

@@ -257,6 +257,7 @@ public class Protocol1_16To1_15_2 extends AbstractProtocol<ClientboundPackets1_1
         tagRewriter.addEmptyTags(RegistryType.ITEM, "minecraft:beds", "minecraft:coals", "minecraft:fences", "minecraft:flowers",
                 "minecraft:lectern_books", "minecraft:music_discs", "minecraft:small_flowers", "minecraft:tall_flowers", "minecraft:trapdoors", "minecraft:walls", "minecraft:wooden_fences");
 
+        EntityTypes1_16.initialize(this);
         Types1_16.PARTICLE.filler(this)
                 .reader("block", ParticleType.Readers.BLOCK)
                 .reader("dust", ParticleType.Readers.DUST)

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16to1_15_2/metadata/MetadataRewriter1_16To1_15_2.java

@@ -18,7 +18,6 @@
 package com.viaversion.viaversion.protocols.protocol1_16to1_15_2.metadata;
 
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_15;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_16;
 import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
 import com.viaversion.viaversion.api.type.types.version.Types1_16;
@@ -30,8 +29,6 @@ public class MetadataRewriter1_16To1_15_2 extends EntityRewriter<ClientboundPack
 
     public MetadataRewriter1_16To1_15_2(Protocol1_16To1_15_2 protocol) {
         super(protocol);
-        mapEntityType(EntityTypes1_15.ZOMBIE_PIGMAN, EntityTypes1_16.ZOMBIFIED_PIGLIN);
-        mapTypes(EntityTypes1_15.values(), EntityTypes1_16.class);
     }
 
     @Override
@@ -50,6 +47,11 @@ public class MetadataRewriter1_16To1_15_2 extends EntityRewriter<ClientboundPack
         });
     }
 
+    @Override
+    public void onMappingDataLoaded() {
+        mapTypes();
+    }
+
     @Override
     public EntityType typeFromId(int type) {
         return EntityTypes1_16.getTypeFromId(type);

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_17to1_16_4/Protocol1_17To1_16_4.java

@@ -203,6 +203,7 @@ public final class Protocol1_17To1_16_4 extends AbstractProtocol<ClientboundPack
         tagRewriter.addEmptyTags(RegistryType.ENTITY, "minecraft:powder_snow_walkable_mobs", "minecraft:axolotl_always_hostiles", "minecraft:axolotl_tempted_hostiles",
                 "minecraft:axolotl_hunt_targets", "minecraft:freeze_hurts_extra_types", "minecraft:freeze_immune_entity_types");
 
+        EntityTypes1_17.initialize(this);
         Types1_17.PARTICLE.filler(this)
                 .reader("block", ParticleType.Readers.BLOCK)
                 .reader("dust", ParticleType.Readers.DUST)

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_17to1_16_4/packets/EntityPackets.java

@@ -22,7 +22,6 @@ import com.github.steveice10.opennbt.tag.builtin.IntTag;
 import com.github.steveice10.opennbt.tag.builtin.ListTag;
 import com.viaversion.viaversion.api.data.entity.EntityTracker;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_16_2;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_17;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
@@ -40,7 +39,6 @@ public final class EntityPackets extends EntityRewriter<ClientboundPackets1_16_2
 
     public EntityPackets(Protocol1_17To1_16_4 protocol) {
         super(protocol);
-        mapTypes(EntityTypes1_16_2.values(), EntityTypes1_17.class);
     }
 
     @Override
@@ -174,6 +172,11 @@ public final class EntityPackets extends EntityRewriter<ClientboundPackets1_16_2
         filter().type(EntityTypes1_17.SHULKER).removeIndex(17);
     }
 
+    @Override
+    public void onMappingDataLoaded() {
+        mapTypes();
+    }
+
     @Override
     public EntityType typeFromId(int type) {
         return EntityTypes1_17.getTypeFromId(type);

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_19_1to1_19/Protocol1_19_1To1_19.java

@@ -190,7 +190,7 @@ public final class Protocol1_19_1To1_19 extends AbstractProtocol<ClientboundPack
                     chatTypeStorage.clear();
 
                     final CompoundTag registry = wrapper.passthrough(Type.NAMED_COMPOUND_TAG);
-                    final ListTag<CompoundTag> chatTypes = TagUtil.getRegistryEntries(registry, "chat_type");
+                    final ListTag<CompoundTag> chatTypes = TagUtil.removeRegistryEntries(registry, "chat_type");
                     for (final CompoundTag chatType : chatTypes) {
                         final NumberTag idTag = chatType.getNumberTag("id");
                         chatTypeStorage.addChatType(idTag.asInt(), chatType);

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/Protocol1_20_5To1_20_3.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -68,7 +68,7 @@ public final class Protocol1_20_5To1_20_3 extends AbstractProtocol<ClientboundPa
     private final EntityPacketRewriter1_20_5 entityRewriter = new EntityPacketRewriter1_20_5(this);
     private final BlockItemPacketRewriter1_20_5 itemRewriter = new BlockItemPacketRewriter1_20_5(this);
     private final TagRewriter<ClientboundPacket1_20_3> tagRewriter = new TagRewriter<>(this);
-    private final ComponentRewriter<ClientboundPacket1_20_3> componentRewriter = new ComponentRewriter1_20_5(this);
+    private final ComponentRewriter1_20_5<ClientboundPacket1_20_3> componentRewriter = new ComponentRewriter1_20_5<>(this, Types1_20_5.STRUCTURED_DATA);
 
     public Protocol1_20_5To1_20_3() {
         super(ClientboundPacket1_20_3.class, ClientboundPacket1_20_5.class, ServerboundPacket1_20_3.class, ServerboundPacket1_20_5.class);

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/ArmorMaterials1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/Attributes1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/BannerPatterns1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/DamageTypes1_20_3.java

@@ -0,0 +1,110 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data;
+
+import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import it.unimi.dsi.fastutil.objects.Object2ObjectMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.objects.ObjectSet;
+
+public final class DamageTypes1_20_3 {
+
+    private static final Object2ObjectMap<String, CompoundTag> DAMAGE_TYPES = new Object2ObjectOpenHashMap<>();
+
+    static {
+        DAMAGE_TYPES.put("in_fire", create("inFire", 0.1F));
+        DAMAGE_TYPES.put("lightning_bolt", create("lightningBolt", 0.1F));
+        DAMAGE_TYPES.put("on_fire", create("onFire", 0.0F, "burning"));
+        DAMAGE_TYPES.put("lava", create("lava", 0.1F, "burning"));
+        DAMAGE_TYPES.put("hot_floor", create("hotFloor", 0.1F, "burning"));
+        DAMAGE_TYPES.put("in_wall", create("inWall", 0.0F));
+        DAMAGE_TYPES.put("cramming", create("cramming", 0.0F));
+        DAMAGE_TYPES.put("drown", create("drown", 0.0F, "drowning"));
+        DAMAGE_TYPES.put("starve", create("starve", 0.0F));
+        DAMAGE_TYPES.put("cactus", create("cactus", 0.1F));
+        DAMAGE_TYPES.put("fall", create("fall", "when_caused_by_living_non_player", 0.0F, null, "fall_variants"));
+        DAMAGE_TYPES.put("fly_into_wall", create("flyIntoWall", 0.0F));
+        DAMAGE_TYPES.put("out_of_world", create("outOfWorld", 0.0F));
+        DAMAGE_TYPES.put("generic", create("generic", 0.0F));
+        DAMAGE_TYPES.put("magic", create("magic", 0.0F));
+        DAMAGE_TYPES.put("wither", create("wither", 0.0F));
+        DAMAGE_TYPES.put("dragon_breath", create("dragonBreath", 0.0F));
+        DAMAGE_TYPES.put("dry_out", create("dryout", 0.1F));
+        DAMAGE_TYPES.put("sweet_berry_bush", create("sweetBerryBush", 0.1F, "poking"));
+        DAMAGE_TYPES.put("freeze", create("freeze", 0.0F, "freezing"));
+        DAMAGE_TYPES.put("stalagmite", create("stalagmite", 0.0F));
+        DAMAGE_TYPES.put("falling_block", create("fallingBlock", 0.1F));
+        DAMAGE_TYPES.put("falling_anvil", create("anvil", 0.1F));
+        DAMAGE_TYPES.put("falling_stalactite", create("fallingStalactite", 0.1F));
+        DAMAGE_TYPES.put("sting", create("sting", 0.1F));
+        DAMAGE_TYPES.put("mob_attack", create("mob", 0.1F));
+        DAMAGE_TYPES.put("mob_attack_no_aggro", create("mob", 0.1F));
+        DAMAGE_TYPES.put("player_attack", create("player", 0.1F));
+        DAMAGE_TYPES.put("arrow", create("arrow", 0.1F));
+        DAMAGE_TYPES.put("trident", create("trident", 0.1F));
+        DAMAGE_TYPES.put("mob_projectile", create("mob", 0.1F));
+        DAMAGE_TYPES.put("fireworks", create("fireworks", 0.1F));
+        DAMAGE_TYPES.put("unattributed_fireball", create("onFire", 0.1F, "burning"));
+        DAMAGE_TYPES.put("fireball", create("fireball", 0.1F, "burning"));
+        DAMAGE_TYPES.put("wither_skull", create("witherSkull", 0.1F));
+        DAMAGE_TYPES.put("thrown", create("thrown", 0.1F));
+        DAMAGE_TYPES.put("indirect_magic", create("indirectMagic", 0.0F));
+        DAMAGE_TYPES.put("thorns", create("thorns", 0.1F, "thorns"));
+        DAMAGE_TYPES.put("explosion", create("explosion", "always", 0.1F));
+        DAMAGE_TYPES.put("player_explosion", create("explosion.player", "always", 0.1F));
+        DAMAGE_TYPES.put("sonic_boom", create("sonic_boom", "always", 0.0F));
+        DAMAGE_TYPES.put("bad_respawn_point", create("badRespawnPoint", "always", 0.1F, "hurt", "intentional_game_design"));
+        DAMAGE_TYPES.put("outside_border", create("outsideBorder", 0.0F));
+        DAMAGE_TYPES.put("generic_kill", create("genericKill", 0.0F));
+    }
+
+    public static CompoundTag get(String key) {
+        return DAMAGE_TYPES.get(key);
+    }
+
+    public static ObjectSet<String> keys() {
+        return DAMAGE_TYPES.keySet();
+    }
+
+    private static CompoundTag create(String messageId, String scaling, float exhaustion) {
+        return create(messageId, scaling, exhaustion, null, null);
+    }
+
+    private static CompoundTag create(String messageId, float exhaustion, String effects) {
+        return create(messageId, "when_caused_by_living_non_player", exhaustion, effects, null);
+    }
+
+    private static CompoundTag create(String messageId, float exhaustion) {
+        return create(messageId, "when_caused_by_living_non_player", exhaustion);
+    }
+
+    private static CompoundTag create(String messageId, String scaling, float exhaustion, String damageEffects, String deathMessageType) {
+        final CompoundTag tag = new CompoundTag();
+        tag.putString("message_id", messageId);
+        tag.putString("scaling", scaling);
+        tag.putFloat("exhaustion", exhaustion);
+        if (damageEffects != null) {
+            tag.putString("effects", damageEffects);
+        }
+        if (deathMessageType != null) {
+            tag.putString("death_message_type", deathMessageType);
+        }
+
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/Potions1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/TrimMaterials1_20_3.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -159,10 +159,10 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
         registerWindowPropertyEnchantmentHandler(ClientboundPackets1_20_3.WINDOW_PROPERTY);
         registerCreativeInvAction(ServerboundPackets1_20_5.CREATIVE_INVENTORY_ACTION);
         protocol.registerServerbound(ServerboundPackets1_20_5.CLICK_WINDOW_BUTTON, wrapper -> {
-            final byte containerId = wrapper.read(Type.BYTE);
-            final byte buttonId = wrapper.read(Type.BYTE);
-            wrapper.write(Type.VAR_INT, (int) containerId);
-            wrapper.write(Type.VAR_INT, (int) buttonId);
+            final byte containerId = wrapper.read(Type.VAR_INT).byteValue();
+            final byte buttonId = wrapper.read(Type.VAR_INT).byteValue();
+            wrapper.write(Type.BYTE, containerId);
+            wrapper.write(Type.BYTE, buttonId);
         });
 
         protocol.registerClientbound(ClientboundPackets1_20_3.ADVANCEMENTS, wrapper -> {
@@ -627,24 +627,22 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
         final int useDuration = instrument.getInt("use_duration");
         final float range = instrument.getFloat("range");
 
-        Holder<SoundEvent> soundEvent;
-        final Tag soundEventTag = instrument.get("sound_event");
-        if (soundEventTag instanceof IntTag) {
-            soundEvent = Holder.of(((IntTag) soundEventTag).asInt());
-        } else if (soundEventTag instanceof CompoundTag) {
-            final CompoundTag soundEventCompound = (CompoundTag) soundEventTag;
-            final StringTag identifier = soundEventCompound.getStringTag("identifier");
+        final Holder<SoundEvent> soundEvent;
+        final CompoundTag soundEventTag = instrument.getCompoundTag("sound_event");
+        if (soundEventTag != null) {
+            final StringTag identifier = soundEventTag.getStringTag("identifier");
             if (identifier == null) {
                 return;
             }
+
             soundEvent = Holder.of(new SoundEvent(
                 identifier.getValue(),
-                soundEventCompound.contains("fixed_range") ?
-                    soundEventCompound.getFloat("fixed_range") : null
+                soundEventTag.contains("fixed_range") ? soundEventTag.getFloat("fixed_range") : null
             ));
         } else {
-            return;
+            soundEvent = Holder.of(instrument.getInt("sound_event"));
         }
+
         data.set(StructuredDataKey.INSTRUMENT, Holder.of(new Instrument(soundEvent, useDuration, range)));
     }
 
@@ -665,6 +663,7 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             if (potionEffectTag == null) {
                 continue;
             }
+
             possibleEffects.add(new FoodEffect(
                 new PotionEffect(
                     potionEffectTag.getInt("effect"),
@@ -696,6 +695,7 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             if (blocks == null) {
                 continue;
             }
+
             rules.add(new ToolRule(
                 blocks,
                 tag.contains("speed") ? tag.getFloat("speed") : null,
@@ -713,14 +713,17 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
         final List<BannerPatternLayer> patternLayer = new ArrayList<>();
         for (final CompoundTag tag : bannerPatterns) {
             final CompoundTag patternTag = tag.getCompoundTag("pattern");
-            if (patternTag == null) {
-                continue;
+            final Holder<BannerPattern> pattern;
+            if (patternTag != null) {
+                final String assetId = patternTag.getString("asset_id");
+                final String translationKey = patternTag.getString("translation_key");
+                pattern = Holder.of(new BannerPattern(assetId, translationKey));
+            } else {
+                pattern = Holder.of(tag.getInt("pattern"));
             }
 
-            final String assetId = patternTag.getString("asset_id");
-            final String translationKey = patternTag.getString("translation_key");
             final int dyeColor = tag.getInt("dye_color");
-            patternLayer.add(new BannerPatternLayer(Holder.of(new BannerPattern(assetId, translationKey)), dyeColor));
+            patternLayer.add(new BannerPatternLayer(pattern, dyeColor));
         }
         data.set(StructuredDataKey.BANNER_PATTERNS, patternLayer.toArray(new BannerPatternLayer[0]));
     }

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/ComponentRewriter1_20_5.java

@@ -71,7 +71,8 @@ import com.viaversion.viaversion.api.minecraft.item.data.ToolRule;
 import com.viaversion.viaversion.api.minecraft.item.data.Unbreakable;
 import com.viaversion.viaversion.api.minecraft.item.data.WrittenBook;
 import com.viaversion.viaversion.api.protocol.Protocol;
-import com.viaversion.viaversion.protocols.protocol1_20_3to1_20_2.packet.ClientboundPacket1_20_3;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.type.types.item.StructuredDataType;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.Protocol1_20_5To1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.ArmorMaterials1_20_5;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.Attributes1_20_5;
@@ -93,18 +94,25 @@ import com.viaversion.viaversion.util.UUIDUtil;
 import com.viaversion.viaversion.util.Unit;
 import it.unimi.dsi.fastutil.ints.Int2IntMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
-import java.util.HashMap;
+import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 import java.util.logging.Level;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
-// 1.20.5 data component -> 1.20.5 nbt conversion
-public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket1_20_3> {
+public class ComponentRewriter1_20_5<C extends ClientboundPacketType> extends ComponentRewriter<C> {
 
-    @SuppressWarnings("rawtypes")
-    protected final Map<StructuredDataKey, DataConverter> rewriters = new HashMap<>();
+    private final Map<StructuredDataKey<?>, ConverterPair<?>> converters = new Reference2ObjectOpenHashMap<>();
+    private final StructuredDataType structuredDataType;
 
-    public ComponentRewriter1_20_5(final Protocol<ClientboundPacket1_20_3, ?, ?, ?> protocol) {
+    /**
+     * @param protocol           protocol
+     * @param structuredDataType unmapped structured data type
+     */
+    public ComponentRewriter1_20_5(final Protocol<C, ?, ?, ?> protocol, final StructuredDataType structuredDataType) {
         super(protocol, ReadType.NBT);
+        this.structuredDataType = structuredDataType;
 
         register(StructuredDataKey.CUSTOM_DATA, this::convertCustomData);
         register(StructuredDataKey.MAX_STACK_SIZE, this::convertMaxStackSize);
@@ -166,6 +174,8 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
 
     @Override
     protected void handleHoverEvent(final UserConnection connection, final CompoundTag hoverEventTag) {
+        super.handleHoverEvent(connection, hoverEventTag);
+
         final StringTag actionTag = hoverEventTag.getStringTag("action");
         if (actionTag == null) {
             return;
@@ -194,19 +204,16 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
                 return;
             }
 
-            final int itemId = Protocol1_20_5To1_20_3.MAPPINGS.getFullItemMappings().id(idTag.getValue());
+            int itemId = Protocol1_20_5To1_20_3.MAPPINGS.getFullItemMappings().id(idTag.getValue());
             if (itemId == -1) {
-                return;
+                // Default to stone (anything that is not air)
+                itemId = 1;
             }
 
             final StringTag tag = contentsTag.remove("tag");
-            if (tag == null) {
-                return;
-            }
-
             final CompoundTag tagTag;
             try {
-                tagTag = (CompoundTag) SerializerVersion.V1_20_3.toTag(tag.getValue());
+                tagTag = tag != null ? (CompoundTag) SerializerVersion.V1_20_3.toTag(tag.getValue()) : null;
             } catch (final Exception e) {
                 if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
                     Via.getPlatform().getLogger().log(Level.WARNING, "Error reading 1.20.3 NBT in show_item: " + contentsTag, e);
@@ -214,19 +221,20 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
                 return;
             }
 
-            final Item oldItem = new DataItem();
-            oldItem.setIdentifier(itemId);
+            final Item dataItem = new DataItem();
+            dataItem.setIdentifier(itemId);
             if (tagTag != null) { // We don't need to remap data if there is none
-                oldItem.setTag(tagTag);
+                dataItem.setTag(tagTag);
             }
 
-            final Item newItem = protocol.getItemRewriter().handleItemToClient(connection, oldItem);
-            if (newItem == null) {
-                return;
+            final Item structuredItem = protocol.getItemRewriter().handleItemToClient(connection, dataItem);
+            if (structuredItem.amount() < 1) {
+                // Cannot be empty
+                structuredItem.setAmount(1);
             }
 
-            if (newItem.identifier() != 0) {
-                final String itemName = Protocol1_20_5To1_20_3.MAPPINGS.getFullItemMappings().mappedIdentifier(newItem.identifier());
+            if (structuredItem.identifier() != 0) {
+                final String itemName = Protocol1_20_5To1_20_3.MAPPINGS.getFullItemMappings().mappedIdentifier(structuredItem.identifier());
                 if (itemName != null) {
                     contentsTag.putString("id", itemName);
                 }
@@ -235,7 +243,7 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
                 contentsTag.putString("id", "minecraft:stone");
             }
 
-            final Map<StructuredDataKey<?>, StructuredData<?>> data = newItem.structuredData().data();
+            final Map<StructuredDataKey<?>, StructuredData<?>> data = structuredItem.structuredData().data();
             if (!data.isEmpty()) {
                 final CompoundTag components;
                 try {
@@ -270,34 +278,62 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         }
     }
 
-    protected CompoundTag toTag(final Map<StructuredDataKey<?>, StructuredData<?>> data, final boolean empty) {
+    public CompoundTag toTag(final Map<StructuredDataKey<?>, StructuredData<?>> data, final boolean empty) {
         final CompoundTag tag = new CompoundTag();
         for (final Map.Entry<StructuredDataKey<?>, StructuredData<?>> entry : data.entrySet()) {
             final StructuredDataKey<?> key = entry.getKey();
-            if (!rewriters.containsKey(key)) { // Should NOT happen
-                Via.getPlatform().getLogger().severe("No converter for " + key.identifier() + " found!");
+            final String identifier = key.identifier();
+
+            //noinspection rawtypes
+            final ConverterPair converter = converters.get(key);
+            if (converter == null) { // Should NOT happen
+                Via.getPlatform().getLogger().severe("No converter found for data component: " + identifier);
                 continue;
             }
+
             final StructuredData<?> value = entry.getValue();
             if (value.isEmpty()) {
                 if (empty) {
                     // Theoretically not needed here, but we'll keep it for consistency
-                    tag.put("!" + key.identifier(), new CompoundTag());
+                    tag.put("!" + identifier, new CompoundTag());
                     continue;
                 }
-                throw new IllegalArgumentException("Empty structured data: " + key.identifier());
+                throw new IllegalArgumentException("Empty structured data: " + identifier);
             }
 
             //noinspection unchecked
-            final Tag valueTag = rewriters.get(key).convert(value.value());
+            final Tag valueTag = converter.dataConverter.convert(value.value());
             if (valueTag == null) {
                 continue;
             }
-            tag.put(key.identifier(), valueTag);
+
+            tag.put(identifier, valueTag);
         }
         return tag;
     }
 
+    public List<StructuredData<?>> toData(final CompoundTag tag) {
+        final List<StructuredData<?>> list = new ArrayList<>();
+        for (final Map.Entry<String, Tag> entry : tag.entrySet()) {
+            final StructuredData<?> data = readFromTag(entry.getKey(), entry.getValue());
+            list.add(data);
+        }
+        return list;
+    }
+
+    public StructuredData<?> readFromTag(final String identifier, final Tag tag) {
+        final int id = protocol.getMappingData().getDataComponentSerializerMappings().mappedId(identifier);
+        Preconditions.checkArgument(id != -1, "Unknown data component: %s", identifier);
+        final StructuredDataKey<?> key = structuredDataType.key(id);
+        return readFromTag(key, id, tag);
+    }
+
+    private <T> StructuredData<T> readFromTag(final StructuredDataKey<T> key, final int id, final Tag tag) {
+        final TagConverter<T> converter = tagConverter(key);
+        Preconditions.checkNotNull(converter, "No converter found for: %s", key);
+        return StructuredData.of(key, converter.convert(tag), id);
+    }
+
     // ---------------------------------------------------------------------------------------
     // Conversion methods, can be overridden in future protocols to handle new changes
 
@@ -365,27 +401,11 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
                 convertHolderSet(predicateTag, "blocks", predicate.holderSet());
             }
             if (predicate.propertyMatchers() != null) {
-                final CompoundTag state = new CompoundTag();
-                for (final StatePropertyMatcher matcher : predicate.propertyMatchers()) {
-                    final Either<String, StatePropertyMatcher.RangedMatcher> match = matcher.matcher();
-                    if (match.isLeft()) {
-                        state.putString(matcher.name(), match.left());
-                    } else {
-                        final StatePropertyMatcher.RangedMatcher range = match.right();
-                        final CompoundTag rangeTag = new CompoundTag();
-                        if (range.minValue() != null) {
-                            rangeTag.putString("min", range.minValue());
-                        }
-                        if (range.maxValue() != null) {
-                            rangeTag.putString("max", range.maxValue());
-                        }
-                        state.put(matcher.name(), rangeTag);
-                    }
-                }
+                final CompoundTag state = convertPredicate(predicate);
                 predicateTag.put("state", state);
             }
             if (predicate.tag() != null) {
-                predicateTag.putString("nbt", serializerVersion().toSNBT(predicate.tag()));
+                predicateTag.put("nbt", predicate.tag());
             }
 
             predicates.add(predicateTag);
@@ -397,6 +417,27 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         return tag;
     }
 
+    protected CompoundTag convertPredicate(final BlockPredicate predicate) {
+        final CompoundTag state = new CompoundTag();
+        for (final StatePropertyMatcher matcher : predicate.propertyMatchers()) {
+            final Either<String, StatePropertyMatcher.RangedMatcher> match = matcher.matcher();
+            if (match.isLeft()) {
+                state.putString(matcher.name(), match.left());
+            } else {
+                final StatePropertyMatcher.RangedMatcher range = match.right();
+                final CompoundTag rangeTag = new CompoundTag();
+                if (range.minValue() != null) {
+                    rangeTag.putString("min", range.minValue());
+                }
+                if (range.maxValue() != null) {
+                    rangeTag.putString("max", range.maxValue());
+                }
+                state.put(matcher.name(), rangeTag);
+            }
+        }
+        return state;
+    }
+
     protected CompoundTag convertCanBreak(final AdventureModePredicate value) {
         return convertCanPlaceOn(value);
     }
@@ -587,7 +628,7 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         final ListTag<CompoundTag> pagesTag = new ListTag<>(CompoundTag.class);
         for (final FilterableString page : value) {
             final CompoundTag pageTag = new CompoundTag();
-            convertFilterableString(pageTag, page, 0, 1024);
+            convertFilterableString(pageTag, page, 1024);
             pagesTag.add(pageTag);
         }
         tag.put("pages", pagesTag);
@@ -596,14 +637,14 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
 
     protected CompoundTag convertWrittenBookContent(final WrittenBook value) {
         final CompoundTag tag = new CompoundTag();
-        convertFilterableString(tag, value.title(), 0, 32);
+        convertFilterableString(tag, value.title(), 32);
         tag.putString("author", value.author());
         if (value.generation() != 0) {
             tag.put("generation", convertIntRange(value.generation(), 0, 3));
         }
 
         final CompoundTag title = new CompoundTag();
-        convertFilterableString(title, value.title(), 0, 32);
+        convertFilterableString(title, value.title(), 32);
         tag.put("title", title);
 
         final ListTag<CompoundTag> pagesTag = new ListTag<>(CompoundTag.class);
@@ -730,7 +771,7 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
     protected CompoundTag convertLodestoneTracker(final LodestoneTracker value) {
         final CompoundTag tag = new CompoundTag();
         if (value.pos() != null) {
-            convertGlobalPos(tag, "target", value.pos());
+            convertGlobalPos(tag, value.pos());
         }
         if (!value.tracked()) {
             tag.putBoolean("tracked", false);
@@ -781,7 +822,7 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
             tag.put("id", new IntArrayTag(UUIDUtil.toIntArray(value.id())));
         }
         if (value.properties().length > 0) {
-            convertProperties(tag, "properties", value.properties());
+            convertProperties(tag, value.properties());
         }
         return tag;
     }
@@ -794,7 +835,7 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         final ListTag<CompoundTag> tag = new ListTag<>(CompoundTag.class);
         for (final BannerPatternLayer layer : value) {
             final CompoundTag layerTag = new CompoundTag();
-            convertBannerPattern(layerTag, "pattern", layer.pattern());
+            convertBannerPattern(layerTag, layer.pattern());
             layerTag.put("color", convertDyeColor(layer.dyeColor()));
             tag.add(layerTag);
         }
@@ -897,7 +938,7 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         }
     }
 
-    protected void convertHolderSet(final CompoundTag tag, final String name, HolderSet set) {
+    protected void convertHolderSet(final CompoundTag tag, final String name, final HolderSet set) {
         if (set.hasTagKey()) {
             tag.putString(name, set.tagKey());
         } else {
@@ -930,10 +971,10 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         tag.put("components", toTag(components, true));
     }
 
-    protected void convertFilterableString(final CompoundTag tag, final FilterableString string, final int min, final int max) {
-        tag.put("raw", convertString(string.raw(), min, max));
+    protected void convertFilterableString(final CompoundTag tag, final FilterableString string, final int max) {
+        tag.put("raw", convertString(string.raw(), 0, max));
         if (string.filtered() != null) {
-            tag.put("filtered", convertString(string.filtered(), min, max));
+            tag.put("filtered", convertString(string.filtered(), 0, max));
         }
     }
 
@@ -944,14 +985,14 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         }
     }
 
-    protected void convertGlobalPos(final CompoundTag tag, final String name, final GlobalPosition position) {
+    protected void convertGlobalPos(final CompoundTag tag, final GlobalPosition position) {
         final CompoundTag posTag = new CompoundTag();
         posTag.putString("dimension", position.dimension());
         posTag.put("pos", new IntArrayTag(new int[]{position.x(), position.y(), position.z()}));
-        tag.put(name, posTag);
+        tag.put("target", posTag);
     }
 
-    protected void convertProperties(final CompoundTag tag, final String name, final GameProfile.Property[] properties) {
+    protected void convertProperties(final CompoundTag tag, final GameProfile.Property[] properties) {
         final ListTag<CompoundTag> propertiesTag = new ListTag<>(CompoundTag.class);
         for (final GameProfile.Property property : properties) {
             final CompoundTag propertyTag = new CompoundTag();
@@ -962,12 +1003,12 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
             }
             propertiesTag.add(propertyTag);
         }
-        tag.put(name, propertiesTag);
+        tag.put("properties", propertiesTag);
     }
 
-    protected void convertBannerPattern(final CompoundTag tag, final String name, final Holder<BannerPattern> pattern) {
+    protected void convertBannerPattern(final CompoundTag tag, final Holder<BannerPattern> pattern) {
         if (pattern.hasId()) {
-            tag.putString(name, BannerPatterns1_20_5.idToKey(pattern.id()));
+            tag.putString("pattern", BannerPatterns1_20_5.idToKey(pattern.id()));
             return;
         }
 
@@ -975,7 +1016,7 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
         final CompoundTag patternTag = new CompoundTag();
         patternTag.put("asset_id", convertIdentifier(bannerPattern.assetId()));
         patternTag.putString("translation_key", bannerPattern.translationKey());
-        tag.put(name, patternTag);
+        tag.put("pattern", patternTag);
     }
 
     // ---------------------------------------------------------------------------------------
@@ -1012,12 +1053,12 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
     }
 
     protected StringTag convertComponent(final Tag value) {
-        return convertComponent(value, 0, Integer.MAX_VALUE);
+        return convertComponent(value, Integer.MAX_VALUE);
     }
 
-    protected StringTag convertComponent(final Tag value, final int min, final int max) {
+    protected StringTag convertComponent(final Tag value, final int max) {
         final String json = serializerVersion().toString(serializerVersion().toComponent(value));
-        return new StringTag(checkStringRange(min, max, json));
+        return new StringTag(checkStringRange(0, max, json));
     }
 
     protected ListTag<StringTag> convertComponents(final Tag[] value, final int maxLength) {
@@ -1081,8 +1122,24 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
 
     // ---------------------------------------------------------------------------------------
 
-    private <T> void register(final StructuredDataKey<T> key, final DataConverter<T> converter) {
-        rewriters.put(key, converter);
+    protected <T> void register(final StructuredDataKey<T> key, final DataConverter<T> dataConverter) { // TODO Remove this method
+        converters.put(key, new ConverterPair<>(dataConverter, null));
+    }
+
+    protected <T> void register(final StructuredDataKey<T> key, final DataConverter<T> dataConverter, final TagConverter<T> tagConverter) {
+        converters.put(key, new ConverterPair<>(dataConverter, tagConverter));
+    }
+
+    protected @Nullable <T> DataConverter<T> dataConverter(final StructuredDataKey<T> key) {
+        //noinspection unchecked
+        final ConverterPair<T> converters = (ConverterPair<T>) this.converters.get(key);
+        return converters != null ? converters.dataConverter : null;
+    }
+
+    protected @Nullable <T> TagConverter<T> tagConverter(final StructuredDataKey<T> key) {
+        //noinspection unchecked
+        final ConverterPair<T> converters = (ConverterPair<T>) this.converters.get(key);
+        return converters != null ? converters.tagConverter : null;
     }
 
     public SerializerVersion serializerVersion() {
@@ -1094,4 +1151,20 @@ public class ComponentRewriter1_20_5 extends ComponentRewriter<ClientboundPacket
 
         Tag convert(T value);
     }
+
+    @FunctionalInterface
+    protected interface TagConverter<T> {
+
+        T convert(final Tag tag);
+    }
+
+    private static final class ConverterPair<T> {
+        private final DataConverter<T> dataConverter;
+        private final TagConverter<T> tagConverter;
+
+        ConverterPair(final DataConverter<T> dataConverter, final TagConverter<T> tagConverter) {
+            this.dataConverter = dataConverter;
+            this.tagConverter = tagConverter;
+        }
+    }
 }

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/EntityPacketRewriter1_20_5.java

@@ -1,6 +1,6 @@
 /*
  * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2023 ViaVersion and contributors
+ * Copyright (C) 2016-2024 ViaVersion and contributors
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -28,6 +28,7 @@ import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.RegistryEntry;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_20_5;
+import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
@@ -40,15 +41,20 @@ import com.viaversion.viaversion.protocols.protocol1_20_3to1_20_2.packet.Clientb
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.Protocol1_20_5To1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.Attributes1_20_5;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.BannerPatterns1_20_5;
+import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.DamageTypes1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.packet.ClientboundConfigurationPackets1_20_5;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.packet.ClientboundPackets1_20_5;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.storage.AcknowledgedMessagesStorage;
 import com.viaversion.viaversion.rewriter.EntityRewriter;
 import com.viaversion.viaversion.util.Key;
 import com.viaversion.viaversion.util.TagUtil;
+import it.unimi.dsi.fastutil.ints.IntArraySet;
+import it.unimi.dsi.fastutil.ints.IntSet;
 import java.util.Arrays;
 import java.util.Map;
+import java.util.Set;
 import java.util.UUID;
+import java.util.stream.Collectors;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class EntityPacketRewriter1_20_5 extends EntityRewriter<ClientboundPacket1_20_3, Protocol1_20_5To1_20_3> {
@@ -112,37 +118,55 @@ public final class EntityPacketRewriter1_20_5 extends EntityRewriter<Clientbound
                 final CompoundTag entryTag = (CompoundTag) entry.getValue();
                 final String type = entryTag.getString("type");
                 final ListTag<CompoundTag> valueTag = entryTag.getListTag("value", CompoundTag.class);
-                RegistryEntry[] registryEntries = new RegistryEntry[valueTag.size()];
+
+                // Calculate number of entries (exclude duplicated ids)
+                RegistryEntry[] registryEntries = new RegistryEntry[valueTag.stream().map(e -> e.getInt("id")).distinct().toArray().length];
                 boolean requiresDummyValues = false;
-                int entriesLength = registryEntries.length;
+                int highestId = -1;
+                final IntSet ids = new IntArraySet();
                 for (final CompoundTag tag : valueTag) {
                     final String name = tag.getString("name");
                     final int id = tag.getInt("id");
-                    entriesLength = Math.max(entriesLength, id + 1);
-                    if (id >= registryEntries.length) {
-                        // It was previously possible to have arbitrary ids
-                        registryEntries = Arrays.copyOf(registryEntries, Math.max(registryEntries.length * 2, id + 1));
-                        requiresDummyValues = true;
+                    if (ids.add(id)) { // Override duplicated id without incrementing entries length
+                        highestId = Math.max(highestId, id);
+                        if (id >= registryEntries.length) {
+                            // It was previously possible to have arbitrary ids, increase array length if needed
+                            registryEntries = Arrays.copyOf(registryEntries, Math.max(registryEntries.length * 2, id + 1));
+                            requiresDummyValues = true;
+                        }
                     }
 
                     registryEntries[id] = new RegistryEntry(name, tag.get("element"));
                 }
 
-                // Add spit damage type
                 if (Key.stripMinecraftNamespace(type).equals("damage_type")) {
-                    final int length = registryEntries.length;
-                    registryEntries = Arrays.copyOf(registryEntries, length + 1);
+                    // Add spit damage type
+                    highestId++;
+                    registryEntries = Arrays.copyOf(registryEntries, highestId + 1);
                     final CompoundTag spitData = new CompoundTag();
                     spitData.putString("scaling", "when_caused_by_living_non_player");
                     spitData.putString("message_id", "mob");
                     spitData.putFloat("exhaustion", 0.1F);
-                    registryEntries[length] = new RegistryEntry("minecraft:spit", spitData);
+                    registryEntries[highestId] = new RegistryEntry("minecraft:spit", spitData);
+
+                    // Fill in missing damage types with 1.20.3/4 defaults
+                    final Set<String> registryEntryKeys = Arrays.stream(registryEntries).map(e -> Key.stripMinecraftNamespace(e.key())).collect(Collectors.toSet());
+                    for (final String key : DamageTypes1_20_3.keys()) {
+                        if (registryEntryKeys.contains(key)) {
+                            continue;
+                        }
+
+                        highestId++;
+                        registryEntries = Arrays.copyOf(registryEntries, highestId + 1);
+                        registryEntries[highestId] = new RegistryEntry(Key.namespaced(key), DamageTypes1_20_3.get(key));
+                    }
                 }
 
                 if (requiresDummyValues) {
                     // Truncate and replace null values
-                    if (registryEntries.length != entriesLength) {
-                        registryEntries = Arrays.copyOf(registryEntries, entriesLength);
+                    final int finalLength = highestId + 1;
+                    if (registryEntries.length != finalLength) {
+                        registryEntries = Arrays.copyOf(registryEntries, finalLength);
                     }
                     replaceNullValues(registryEntries);
                 }
@@ -385,6 +409,16 @@ public final class EntityPacketRewriter1_20_5 extends EntityRewriter<Clientbound
             Types1_20_5.META_TYPES.particleType,
             null
         );
+        filter().metaType(Types1_20_5.META_TYPES.componentType).handler((event, meta) -> protocol.getComponentRewriter().processTag(event.user(), meta.value()));
+        filter().metaType(Types1_20_5.META_TYPES.optionalComponentType).handler((event, meta) -> protocol.getComponentRewriter().processTag(event.user(), meta.value()));
+
+        filter().metaType(Types1_20_5.META_TYPES.itemType).handler((event, meta) -> {
+            final Item item = meta.value();
+            if (item != null && item.amount() <= 0) {
+                // No longer accepted by the client, needs to be properly empty
+                meta.setValue(null);
+            }
+        });
 
         filter().type(EntityTypes1_20_5.LIVINGENTITY).index(10).handler((event, meta) -> {
             final int effectColor = meta.value();

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java

@@ -424,15 +424,27 @@ public final class StructuredDataConverter {
             if (backupInconvertibleData) {
                 // Backup whole data if one of the entries is inconvertible
                 // Since we don't want to break the order of the entries
-                if (Arrays.stream(data).anyMatch(layer -> layer.pattern().isDirect() || BannerPatterns1_20_5.idToKey(layer.pattern().id()) == null)) {
+                if (Arrays.stream(data).anyMatch(layer -> {
+                    if (layer.pattern().isDirect()) {
+                        return true;
+                    }
+
+                    final String identifier = BannerPatterns1_20_5.idToKey(layer.pattern().id());
+                    return identifier == null || identifier.equals("flow") || identifier.equals("guster");
+                })) {
                     final ListTag<CompoundTag> originalPatterns = new ListTag<>(CompoundTag.class);
                     for (final BannerPatternLayer layer : data) {
                         final CompoundTag layerTag = new CompoundTag();
-                        final CompoundTag patternTag = new CompoundTag();
-                        final BannerPattern pattern = layer.pattern().value();
-                        patternTag.putString("asset_id", pattern.assetId());
-                        patternTag.putString("translation_key", pattern.translationKey());
-                        layerTag.put("pattern", patternTag);
+                        if (layer.pattern().isDirect()) {
+                            final CompoundTag patternTag = new CompoundTag();
+                            final BannerPattern pattern = layer.pattern().value();
+                            patternTag.putString("asset_id", pattern.assetId());
+                            patternTag.putString("translation_key", pattern.translationKey());
+                            layerTag.put("pattern", patternTag);
+                        } else {
+                            layerTag.putInt("pattern", layer.pattern().id());
+                        }
+
                         layerTag.putInt("dye_color", layer.dyeColor());
                         originalPatterns.add(layerTag);
                     }
@@ -452,6 +464,10 @@ public final class StructuredDataConverter {
                 }
 
                 final String compactKey = BannerPatterns1_20_5.fullIdToCompact(key);
+                if (compactKey == null) {
+                    continue;
+                }
+
                 final CompoundTag patternTag = new CompoundTag();
                 patternTag.putString("Pattern", compactKey);
                 patternTag.putInt("Color", layer.dyeColor());
@@ -755,18 +771,23 @@ public final class StructuredDataConverter {
         final ListTag<CompoundTag> itemsTag = new ListTag<>(CompoundTag.class);
         for (final Item item : items) {
             final CompoundTag savedItem = new CompoundTag();
-            final String name = toMappedItemName(item.identifier());
-            savedItem.putString("id", name);
-            if (backupInconvertibleData && name.isEmpty()) {
-                savedItem.putInt(ITEM_BACKUP_TAG_KEY, item.identifier());
-            }
-            savedItem.putByte("Count", (byte) item.amount());
+            if (item != null) {
+                final String name = toMappedItemName(item.identifier());
+                savedItem.putString("id", name);
+                if (backupInconvertibleData && name.isEmpty()) {
+                    savedItem.putInt(ITEM_BACKUP_TAG_KEY, item.identifier());
+                }
+                savedItem.putByte("Count", (byte) item.amount());
 
-            final CompoundTag itemTag = new CompoundTag();
-            for (final StructuredData<?> data : item.structuredData().data().values()) {
-                writeToTag(data, itemTag);
+                final CompoundTag itemTag = new CompoundTag();
+                for (final StructuredData<?> data : item.structuredData().data().values()) {
+                    writeToTag(data, itemTag);
+                }
+                savedItem.put("tag", itemTag);
+            } else {
+                savedItem.putString("id", "air");
             }
-            savedItem.put("tag", itemTag);
+
             itemsTag.add(savedItem);
         }
         tag.put(key, itemsTag);

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredNBTConverter.java

@@ -1,65 +0,0 @@
-/*
- * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2024 ViaVersion and contributors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.rewriter;
-
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
-import com.github.steveice10.opennbt.tag.builtin.Tag;
-import com.google.common.base.Preconditions;
-import com.viaversion.viaversion.api.minecraft.data.StructuredData;
-import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-// 1.20.5 nbt -> 1.20.5 data component conversion, technically only needed in VB but kept here to make maintenance easier
-public final class StructuredNBTConverter {
-
-    private static final Map<String, DataConverter<?>> rewriters = new HashMap<>();
-
-    static {
-        register(StructuredDataKey.CUSTOM_DATA, tag -> (CompoundTag) tag);
-        // TODO Add missing handlers for other data types, this will probably be done after the component rework
-    }
-
-    public static List<StructuredData<?>> toData(final CompoundTag tag) {
-        final List<StructuredData<?>> data = new ArrayList<>();
-        for (final Map.Entry<String, Tag> entry : tag.entrySet()) {
-            final StructuredData<?> structuredData = readFromTag(entry.getKey(), entry.getValue());
-            data.add(structuredData);
-        }
-        return data;
-    }
-
-    @SuppressWarnings("unchecked")
-    public static <T> StructuredData<T> readFromTag(final String identifier, final Tag tag) {
-        final DataConverter<T> converter = (DataConverter<T>) rewriters.get(identifier);
-        Preconditions.checkNotNull(converter, "No converter for %s found", identifier);
-        return (StructuredData<T>) converter.convert(tag);
-    }
-
-    private static <T> void register(final StructuredDataKey<T> key, final DataConverter<T> converter) {
-        rewriters.put(key.identifier(), converter);
-    }
-
-    @FunctionalInterface
-    interface DataConverter<T> {
-
-        T convert(final Tag tag);
-    }
-}

common/src/main/java/com/viaversion/viaversion/rewriter/CommandRewriter.java

@@ -18,12 +18,14 @@
 package com.viaversion.viaversion.rewriter;
 
 import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.data.FullMappings;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.type.Type;
 import java.util.HashMap;
 import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
  * Abstract rewriter for the declare commands packet to handle argument type name and content changes.
@@ -118,16 +120,23 @@ public class CommandRewriter<C extends ClientboundPacketType> {
                 if (nodeType == 2) { // Argument node
                     int argumentTypeId = wrapper.read(Type.VAR_INT);
                     String argumentType = argumentType(argumentTypeId);
+                    if (argumentType == null) {
+                        // Modded servers may send unknown argument types that are ignored by the client
+                        // Adjust the id to the hopefully still assumed out-of-bounds pos...
+                        wrapper.write(Type.VAR_INT, mapInvalidArgumentType(argumentTypeId));
+                        continue;
+                    }
+
                     String newArgumentType = handleArgumentType(argumentType);
                     Preconditions.checkNotNull(newArgumentType, "No mapping for argument type %s", argumentType);
                     wrapper.write(Type.VAR_INT, mappedArgumentTypeId(newArgumentType));
 
                     // Always call the handler using the previous name
                     handleArgument(wrapper, argumentType);
-                }
 
-                if ((flags & 0x10) != 0) {
-                    wrapper.passthrough(Type.STRING); // Suggestion type
+                    if ((flags & 0x10) != 0) {
+                        wrapper.passthrough(Type.STRING); // Suggestion type
+                    }
                 }
             }
 
@@ -148,21 +157,35 @@ public class CommandRewriter<C extends ClientboundPacketType> {
      * @param argumentType argument type
      * @return mapped argument type
      */
-    public String handleArgumentType(String argumentType) {
+    public String handleArgumentType(final String argumentType) {
         if (protocol.getMappingData() != null && protocol.getMappingData().getArgumentTypeMappings() != null) {
             return protocol.getMappingData().getArgumentTypeMappings().mappedIdentifier(argumentType);
         }
         return argumentType;
     }
 
-    protected String argumentType(int argumentTypeId) {
-        return protocol.getMappingData().getArgumentTypeMappings().identifier(argumentTypeId);
+    protected @Nullable String argumentType(final int argumentTypeId) {
+        final FullMappings mappings = protocol.getMappingData().getArgumentTypeMappings();
+        final String identifier = mappings.identifier(argumentTypeId);
+        // Allow unknown argument types to be passed through as long as they are actually out of bounds
+        Preconditions.checkArgument(identifier != null || argumentTypeId >= mappings.size(), "Unknown argument type id %s", argumentTypeId);
+        return identifier;
     }
 
-    protected int mappedArgumentTypeId(String mappedArgumentType) {
+    protected int mappedArgumentTypeId(final String mappedArgumentType) {
         return protocol.getMappingData().getArgumentTypeMappings().mappedId(mappedArgumentType);
     }
 
+    private int mapInvalidArgumentType(final int id) {
+        if (id < 0) {
+            return id;
+        }
+
+        final FullMappings mappings = protocol.getMappingData().getArgumentTypeMappings();
+        final int idx = id - mappings.size();
+        return mappings.mappedSize() + idx;
+    }
+
     @FunctionalInterface
     public interface CommandArgumentConsumer {
 

common/src/main/java/com/viaversion/viaversion/rewriter/EntityRewriter.java

@@ -170,30 +170,6 @@ public abstract class EntityRewriter<C extends ClientboundPacketType, T extends
         typeMappings.setNewId(id, mappedId);
     }
 
-    /**
-     * Maps entity ids based on the enum constant's names.
-     *
-     * @param oldTypes     entity types of the higher version
-     * @param newTypeClass entity types enum class of the lower version
-     * @param <E>          new enum entity type
-     */
-    public <E extends Enum<E> & EntityType> void mapTypes(EntityType[] oldTypes, Class<E> newTypeClass) {
-        if (typeMappings == null) {
-            typeMappings = Int2IntMapMappings.of();
-        }
-        for (EntityType oldType : oldTypes) {
-            try {
-                E newType = Enum.valueOf(newTypeClass, oldType.name());
-                typeMappings.setNewId(oldType.getId(), newType.getId());
-            } catch (IllegalArgumentException notFound) {
-                if (!typeMappings.contains(oldType.getId())) {
-                    Via.getPlatform().getLogger().warning("Could not find new entity type for " + oldType + "! " +
-                        "Old type: " + oldType.getClass().getEnclosingClass().getSimpleName() + ", new type: " + newTypeClass.getEnclosingClass().getSimpleName());
-                }
-            }
-        }
-    }
-
     /**
      * Maps entity ids based on the protocol's mapping data.
      */

common/src/main/java/com/viaversion/viaversion/rewriter/StructuredItemRewriter.java

@@ -19,17 +19,10 @@ package com.viaversion.viaversion.rewriter;
 
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.data.MappingData;
-import com.viaversion.viaversion.api.data.Mappings;
-import com.viaversion.viaversion.api.data.ParticleMappings;
-import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
-import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
-import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
-import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
-import com.viaversion.viaversion.api.rewriter.RewriterBase;
 import com.viaversion.viaversion.api.type.Type;
 import org.checkerframework.checker.nullness.qual.Nullable;
 

common/src/main/java/com/viaversion/viaversion/util/TagUtil.java

@@ -26,13 +26,42 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public final class TagUtil {
 
     public static ListTag<CompoundTag> getRegistryEntries(final CompoundTag tag, final String key) {
+        return getRegistryEntries(tag, key, null);
+    }
+
+    public static ListTag<CompoundTag> getRegistryEntries(final CompoundTag tag, final String key, final @Nullable ListTag<CompoundTag> defaultValue) {
         CompoundTag registry = tag.getCompoundTag(Key.namespaced(key));
         if (registry == null) {
             registry = tag.getCompoundTag(Key.stripMinecraftNamespace(key));
+            if (registry == null) {
+                return defaultValue;
+            }
         }
         return registry.getListTag("value", CompoundTag.class);
     }
 
+    public static ListTag<CompoundTag> removeRegistryEntries(final CompoundTag tag, final String key) {
+        return removeRegistryEntries(tag, key, null);
+    }
+
+    public static ListTag<CompoundTag> removeRegistryEntries(final CompoundTag tag, final String key, final @Nullable ListTag<CompoundTag> defaultValue) {
+        String currentKey = Key.namespaced(key);
+        CompoundTag registry = tag.getCompoundTag(currentKey);
+        if (registry == null) {
+            currentKey = Key.stripMinecraftNamespace(key);
+            registry = tag.getCompoundTag(currentKey);
+            if (registry == null) {
+                return defaultValue;
+            }
+        }
+        tag.remove(currentKey);
+        return registry.getListTag("value", CompoundTag.class);
+    }
+
+    public static boolean removeNamespaced(final CompoundTag tag, final String key) {
+        return tag.remove(Key.namespaced(key)) != null || tag.remove(Key.stripMinecraftNamespace(key)) != null;
+    }
+
     public static Tag handleDeep(final Tag tag, final TagUpdater consumer) {
         return handleDeep(null, tag, consumer);
     }

common/src/test/java/com/viaversion/viaversion/common/entities/EntityTypesTest.java

@@ -1,52 +0,0 @@
-/*
- * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2024 ViaVersion and contributors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package com.viaversion.viaversion.common.entities;
-
-import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_14;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_15;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_16;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_16_2;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_17;
-import java.util.function.Function;
-import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.Test;
-
-/**
- * Test to make sure the array storage approach of entity types works correctly.
- */
-public class EntityTypesTest {
-
-    @Test
-    void testArrayOrder() {
-        testArrayOrder(EntityTypes1_14.values(), EntityTypes1_14::getTypeFromId);
-        testArrayOrder(EntityTypes1_15.values(), EntityTypes1_15::getTypeFromId);
-        testArrayOrder(EntityTypes1_16.values(), EntityTypes1_16::getTypeFromId);
-        testArrayOrder(EntityTypes1_16_2.values(), EntityTypes1_16_2::getTypeFromId);
-        testArrayOrder(EntityTypes1_17.values(), EntityTypes1_17::getTypeFromId);
-        // Newer type enums are automatically filled using mappings
-    }
-
-    private void testArrayOrder(EntityType[] types, Function<Integer, EntityType> returnFunction) {
-        for (EntityType type : types) {
-            if (type.getId() != -1) {
-                Assertions.assertEquals(type, returnFunction.apply(type.getId()));
-            }
-        }
-    }
-}

gradle.properties

@@ -1,9 +1,9 @@
 # Project properties - we put these here so they can be modified without causing a recompile of the build scripts
-projectVersion=4.10.0
+projectVersion=4.10.1
 
 # Smile emoji
-mcVersions=1.20.5,1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2, 1.18.1, 1.18, 1.17.1, 1.17, 1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16, 1.15.2, 1.15.1, 1.15, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14, 1.13.2, 1.13.1, 1.13, 1.12.2, 1.12.1, 1.12, 1.11.2, 1.11.1, 1.11, 1.10.2, 1.10.1, 1.10, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9, 1.8.9
-mcVersionRange=1.8-1.20.5
+mcVersions=1.20.6,1.20.5,1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2, 1.18.1, 1.18, 1.17.1, 1.17, 1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16, 1.15.2, 1.15.1, 1.15, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14, 1.13.2, 1.13.1, 1.13, 1.12.2, 1.12.1, 1.12, 1.11.2, 1.11.1, 1.11, 1.10.2, 1.10.1, 1.10, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9, 1.8.9
+mcVersionRange=1.8-1.20.6
 waterfallVersion=1.20
 velocityVersion=3.3
 

universal/build.gradle.kts

@@ -14,6 +14,9 @@ dependencies {
 
 tasks {
     shadowJar {
+        manifest {
+            attributes["paperweight-mappings-namespace"] = "mojang"
+        }
         archiveClassifier.set("")
         archiveFileName.set("ViaVersion-${project.version}.jar")
         destinationDirectory.set(rootProject.projectDir.resolve("build/libs"))