избавляемся от рефлексии: скины для голов

phantom-classes/build.gradle

@@ -0,0 +1,3 @@
+dependencies {
+    compileOnly libs.bukkit
+}

phantom-classes/gradle.properties

@@ -0,0 +1,2 @@
+moduleName=phantom-classes
+moduleVersion=1.0-SNAPSHOT

phantom-classes/src/main/java/com/mojang/authlib/GameProfile.java

@@ -0,0 +1,16 @@
+package com.mojang.authlib;
+
+import com.mojang.authlib.properties.PropertyMap;
+
+import java.util.UUID;
+
+public class GameProfile {
+
+	public GameProfile(UUID id, String name) {
+
+	}
+
+	public PropertyMap getProperties() {
+		return null;
+	}
+}

phantom-classes/src/main/java/com/mojang/authlib/properties/Property.java

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+package com.mojang.authlib.properties;
+
+public class Property {
+
+	public Property(String value, String name) {
+
+	}
+}

phantom-classes/src/main/java/com/mojang/authlib/properties/PropertyMap.java

@@ -0,0 +1,12 @@
+package com.mojang.authlib.properties;
+
+import com.google.common.collect.ForwardingMultimap;
+import com.google.common.collect.Multimap;
+
+public class PropertyMap extends ForwardingMultimap<String, Property> {
+
+	@Override
+	protected Multimap<String, Property> delegate() {
+		return null;
+	}
+}

phantom-classes/src/main/java/net/minecraft/server/v1_12_R1/BlockPosition.java

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+package net.minecraft.server.v1_12_R1;
+
+public class BlockPosition {
+
+	public BlockPosition(double x, double y, double z) {
+	}
+}

phantom-classes/src/main/java/net/minecraft/server/v1_12_R1/TileEntity.java

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+package net.minecraft.server.v1_12_R1;
+
+public class TileEntity {
+
+}

phantom-classes/src/main/java/net/minecraft/server/v1_12_R1/TileEntitySkull.java

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+package net.minecraft.server.v1_12_R1;
+
+import com.mojang.authlib.GameProfile;
+
+public class TileEntitySkull extends TileEntity {
+
+	public void setGameProfile(GameProfile gameprofile) {
+
+	}
+}

phantom-classes/src/main/java/net/minecraft/server/v1_12_R1/WorldServer.java

@@ -0,0 +1,8 @@
+package net.minecraft.server.v1_12_R1;
+
+public class WorldServer {
+
+	public TileEntity getTileEntity(BlockPosition pos) {
+		return null;
+	}
+}

phantom-classes/src/main/java/org/bukkit/craftbukkit/v1_12_R1/CraftWorld.java

@@ -0,0 +1,10 @@
+package org.bukkit.craftbukkit.v1_12_R1;
+
+import net.minecraft.server.v1_12_R1.WorldServer;
+
+public class CraftWorld {
+
+	public WorldServer getHandle() {
+		return null;
+	}
+}