Development Assistance HELP: Nested Classes, NMS mobs, and a noSuchMethodException

OK, the other day I was trying to make all my NMS methods, classes and fields in one class file. Then I would use reflection to choose the class that corresponds to the right version of MC/Spigot that the server is running. This works nicely, but I get an error almost every time I turn the server on or when a player approaches a regular sheep that was generated by minecraft in world that has nothing to do with my plugin. The NMS I need to do includes spawning a custom mob, NMS methods that manage the custom mob and other NMS parts of my project.

This is that all-inclusive class:

Code:

package com.dumbninja22.plugin.ver;

import java.lang.reflect.Field;
import java.util.List;
import java.util.Map;

import net.minecraft.server.v1_8_R2.IChatBaseComponent;
import net.minecraft.server.v1_8_R2.IChatBaseComponent.ChatSerializer;
import net.minecraft.server.v1_8_R2.PacketPlayOutTitle;
import net.minecraft.server.v1_8_R2.AttributeInstance;
import net.minecraft.server.v1_8_R2.BiomeBase;
import net.minecraft.server.v1_8_R2.EntityInsentient;
import net.minecraft.server.v1_8_R2.EntitySheep;
import net.minecraft.server.v1_8_R2.EntityTypes;
import net.minecraft.server.v1_8_R2.EnumColor;
import net.minecraft.server.v1_8_R2.GenericAttributes;
import net.minecraft.server.v1_8_R2.PacketPlayOutTitle.EnumTitleAction;
import net.minecraft.server.v1_8_R2.PathEntity;
import net.minecraft.server.v1_8_R2.PathfinderGoalSelector;
import net.minecraft.server.v1_8_R2.BiomeBase.BiomeMeta;
import net.minecraft.server.v1_8_R2.World;

import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_8_R2.entity.CraftPlayer;
import org.bukkit.craftbukkit.v1_8_R2.CraftWorld;
import org.bukkit.craftbukkit.v1_8_R2.entity.CraftEntity;
import org.bukkit.craftbukkit.v1_8_R2.entity.CraftSheep;
import org.bukkit.craftbukkit.v1_8_R2.util.UnsafeList;
import org.bukkit.entity.Entity;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.scheduler.BukkitRunnable;

import com.dumbninja22.plugin.Main;
import com.dumbninja22.plugin.NMS; //This import is an interface class

public class v1_8_R2 implements NMS {
  
    public void registerEntities() {
        CustomEntityType.registerEntities();
      
    }
  
public void nmsMethodOne(String str, Player p) {
        //NMS Method
      
    }
  
public EnumColor nmsMethodTwo() {
     
      
    }

  
  
    public void anotherNMSMethod(){
       
      
   
  
  
    public void anotherNMSMethod(){



    }
       
  
    //The custom entity sheep
    public enum CustomEntityType {
        CUSTOMSHEEP("Sheep",91,EntityType.SHEEP,EntitySheep.class,v1_8_R2.CustomEntitySheep.class);
            private String name = new String();
            private int id;
            private EntityType entityType;
            private Class<? extends EntityInsentient> nmsClass;
            private Class<? extends EntityInsentient> customClass;
           
            private CustomEntityType(/*The name of the NMS entity*/String name, /*The entity id*/int id, /*The entity type*/EntityType entityType, /*The origional NMS class*/ Class<? extends EntityInsentient> nmsClass, /*The custom class*/ Class<? extends EntityInsentient> customClass) {
            this.name = name;
            this.id = id;
            this.entityType = entityType;
            this.nmsClass = nmsClass;
            this.customClass = customClass;
            }
           
            public String getName() {
            return name;
            }
           
            public int getID() {
            return id;
            }
           
            public EntityType getEntityType() {
            return entityType;
            }
           
            public Class<? extends EntityInsentient> getNMSClass() {
            return nmsClass;
            }
           
            public Class<? extends EntityInsentient> getCustomClass() {
            return customClass;
            }

            /*Register our entities to the server, add to onEnable()*/
            public static void registerEntities() {
            for (CustomEntityType entity : values()) /*Get our entities*/
            a(entity.getCustomClass(), entity.getName(), entity.getID());
            /*Get all biomes on the server*/
            BiomeBase[] biomes;
            try {
            biomes = (BiomeBase[]) getPrivateStatic(BiomeBase.class, "biomes");
            } catch (Exception exc) {
            return;
            }
            for (BiomeBase biomeBase : biomes) {
            if (biomeBase == null)
            break;
            for (String field : new String[] { "at", "au", "av", "aw" }) //Lists that hold all entity types
            try {
            Field list = BiomeBase.class.getDeclaredField(field);
            list.setAccessible(true);
            @SuppressWarnings("unchecked")
            List<BiomeMeta> mobList = (List<BiomeMeta>) list.get(biomeBase);
           
            for (BiomeMeta meta : mobList)
            for (CustomEntityType entity : values())
            if (entity.getNMSClass().equals(meta.b)) /*Test if the entity has the custom entity type*/
            meta.b = entity.getCustomClass(); //Set it's meta to our custom class's meta
            } catch (Exception e) {
            e.printStackTrace();
            }
            }
            }
          
          
          
            public static Entity spawn(Location location) {
                World nmsWorld = ((CraftWorld) location.getWorld()).getHandle();
                CustomEntitySheep customSheepy = new v1_8_R2(). new CustomEntitySheep(nmsWorld);
                customSheepy.setPosition(location.getX(), location.getY(), location.getZ());
                nmsWorld.addEntity(customSheepy);
              
                return customSheepy.getBukkitEntity();


              
             
            }
            /*Method(add to onDisable()) to prevent server leaks when the plugin gets disabled*/
            @SuppressWarnings("rawtypes")
            public static void unregisterEntities() {
            for (CustomEntityType entity : values()) {
            // Remove our class references.
            try {
            ((Map) getPrivateStatic(EntityTypes.class, "d")).remove(entity.getCustomClass());
            } catch (Exception e) {
            e.printStackTrace();
            }
           
            try {
            ((Map) getPrivateStatic(EntityTypes.class, "f")).remove(entity.getCustomClass());
            } catch (Exception e) {
            e.printStackTrace();
            }
            }
           
            for (CustomEntityType entity : values())
            try {
            a(entity.getNMSClass(), entity.getName(), entity.getID());
            } catch (Exception e) {
            e.printStackTrace();
            }
           
            BiomeBase[] biomes;
            try {
            biomes = (BiomeBase[]) getPrivateStatic(BiomeBase.class, "biomes"); /*Get all biomes again*/
            } catch (Exception exc) {
            return;
            }
            for (BiomeBase biomeBase : biomes) {
            if (biomeBase == null)
            break;
           
            for (String field : new String[] { "at", "au", "av", "aw" }) /*The entity list*/
            try {
            Field list = BiomeBase.class.getDeclaredField(field);
            list.setAccessible(true);
            @SuppressWarnings("unchecked")
            List<BiomeMeta> mobList = (List<BiomeMeta>) list.get(biomeBase);
           
            for (BiomeMeta meta : mobList)
            for (CustomEntityType entity : values())
            if (entity.getCustomClass().equals(meta.b))
            meta.b = entity.getNMSClass(); /*Set the entities meta back to the NMS one*/
            } catch (Exception e) {
            e.printStackTrace();
            }
            }
            }
            /*A little Util for getting a private field*/
            @SuppressWarnings("rawtypes")
            private static Object getPrivateStatic(Class clazz, String f) throws Exception {
            Field field = clazz.getDeclaredField(f);
            field.setAccessible(true);
            return field.get(null);
            }
            /*Set data into the entitytypes class from NMS*/
            @SuppressWarnings({ "unchecked", "rawtypes" })
            private static void a(Class paramClass, String paramString, int paramInt) {
            try {
            ((Map) getPrivateStatic(EntityTypes.class, "c")).put(paramString, paramClass);
            ((Map) getPrivateStatic(EntityTypes.class, "d")).put(paramClass, paramString);
            ((Map) getPrivateStatic(EntityTypes.class, "e")).put(Integer.valueOf(paramInt), paramClass);
            ((Map) getPrivateStatic(EntityTypes.class, "f")).put(paramClass, Integer.valueOf(paramInt));
            ((Map) getPrivateStatic(EntityTypes.class, "g")).put(paramString, Integer.valueOf(paramInt));
            } catch (Exception exc) {
            }
            }
    }
  
  
   
  
    public class CustomEntitySheep extends EntitySheep {

      
//Yes, this IS an NMS world (1.8.3)
        public CustomEntitySheep(World mcWorld) {
            super(mcWorld);
          
            try {
                Field bField = PathfinderGoalSelector.class.getDeclaredField("b");
                bField.setAccessible(true);
                Field cField = PathfinderGoalSelector.class.getDeclaredField("c");
                cField.setAccessible(true);
                bField.set(goalSelector, new UnsafeList<PathfinderGoalSelector>());
                bField.set(targetSelector, new UnsafeList<PathfinderGoalSelector>());
                cField.set(goalSelector, new UnsafeList<PathfinderGoalSelector>());
                cField.set(targetSelector, new UnsafeList<PathfinderGoalSelector>());
              
                } catch (Exception exc) {
                exc.printStackTrace();
                }
          
        }
  
    }
    public Entity spawn(Location location) {
        Entity e = CustomEntityType.spawn(location);
        return e;
    }

}

I'm getting this error:

Code:

java.lang.NoSuchMethodException: com.dumbninja22.plugin.ver.v1_8_R2$CustomEntitySheep.<init>(net.minecraft.server.v1_8_R2.World)
[15:13:55] [Server thread/WARN]:     at java.lang.Class.getConstructor0(Unknown Source)
[15:13:55] [Server thread/WARN]:     at java.lang.Class.getConstructor(Unknown Source)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.SpawnerCreature.a(SpawnerCreature.java:276)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.ChunkProviderGenerate.getChunkAt(SourceFile:475)
[15:13:55] [Server thread/WARN]:     at org.bukkit.craftbukkit.v1_8_R2.generator.NormalChunkGenerator.getChunkAt(NormalChunkGenerator.java:51)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:266)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.Chunk.loadNearby(Chunk.java:985)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.ChunkProviderServer.originalGetChunkAt(ChunkProviderServer.java:185)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:118)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PlayerChunkMap$PlayerChunk.<init>(PlayerChunkMap.java:337)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PlayerChunkMap.a(PlayerChunkMap.java:93)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PlayerChunkMap.b(PlayerChunkMap.java:172)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PlayerChunkMap.movePlayer(PlayerChunkMap.java:249)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PlayerList.d(PlayerList.java:336)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:453)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PacketPlayInFlying.a(SourceFile:126)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PacketPlayInFlying$PacketPlayInPositionLook.a(SourceFile:18)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:13)
[15:13:55] [Server thread/WARN]:     at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[15:13:55] [Server thread/WARN]:     at java.util.concurrent.FutureTask.run(Unknown Source)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:714)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:655)
[15:13:55] [Server thread/WARN]:     at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:558)
[15:13:55] [Server thread/WARN]:     at java.lang.Thread.run(Unknown Source)
     

 

Well then. It appears I had to compromise, but at least my problem is solved. I ended up separating the custom sheep class and constructor and putting it in another "file" within the project. That does mean that everytime a new MC version comes out I'll have to copy/paste two files instead of one, but what can I do. Lesson Learned: Nested classes are not as good as advertised.

If there are no more comments/suggestions, I'm requesting a lock.