Solved NMS need help

so i followed a nms tutorial i found and everything is fine and dadny but when i try to spawn the custom entity i made i get this error :

Code:

[11:50:50] [Server thread/WARN]: java.lang.IllegalArgumentException: Can not set final java.util.Set field net.minecraft.server.v1_11_R1.PathfinderGoalSelector.b to org.bukkit.craftbukkit.v1_11_R1.util.UnsafeList
[11:50:50] [Server thread/WARN]:     at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
[11:50:50] [Server thread/WARN]:     at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
[11:50:50] [Server thread/WARN]:     at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.set(Unknown Source)
[11:50:50] [Server thread/WARN]:     at java.lang.reflect.Field.set(Unknown Source)
[11:50:50] [Server thread/WARN]:     at me.spiroulis.rpg.villager.<init>(villager.java:28)
[11:50:50] [Server thread/WARN]:     at me.spiroulis.rpg.main.onCreatureSpawn(main.java:36)
[11:50:50] [Server thread/WARN]:     at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
[11:50:50] [Server thread/WARN]:     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[11:50:50] [Server thread/WARN]:     at java.lang.reflect.Method.invoke(Unknown Source)
[11:50:50] [Server thread/WARN]:     at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296)
[11:50:50] [Server thread/WARN]:     at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
[11:50:50] [Server thread/WARN]:     at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501)
[11:50:50] [Server thread/WARN]:     at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486)
[11:50:50] [Server thread/WARN]:     at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:283)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.World.addEntity(World.java:994)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.WorldServer.addEntity(WorldServer.java:1045)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.BlockPumpkin.c(BlockPumpkin.java:66)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.BlockPumpkin.onPlace(BlockPumpkin.java:37)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.ItemStack.placeItem(ItemStack.java:234)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.PlayerInteractManager.a(PlayerInteractManager.java:495)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:880)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.PacketPlayInUseItem.a(SourceFile:55)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.PacketPlayInUseItem.a(SourceFile:11)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13)
[11:50:50] [Server thread/WARN]:     at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[11:50:50] [Server thread/WARN]:     at java.util.concurrent.FutureTask.run(Unknown Source)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:695)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:360)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:650)
[11:50:50] [Server thread/WARN]:     at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:554)
[11:50:50] [Server thread/WARN]:     at java.lang.Thread.run(Unknown Source)

My custom entity code :

HTML:

public class villager extends EntityVillager{

    public villager(World world) {
       
        super(world);
        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 e) {
            e.printStackTrace();
    }   

    this.goalSelector.a(0, new PathfinderGoalFloat(this));
    this.goalSelector.a(1, new PathfinderGoalLookAtTradingPlayer(this));
    this.goalSelector.a(5, new PathfinderGoalMoveTowardsRestriction(this, 0.6D));
    this.goalSelector.a(9, new PathfinderGoalInteract(this, EntityHuman.class, 3.0F, 1.0F));
    this.goalSelector.a(9, new PathfinderGoalInteract(this, EntityVillager.class, 5.0F, 0.02F));
    this.goalSelector.a(9, new PathfinderGoalRandomStroll(this, 0.6D));
    this.goalSelector.a(10, new PathfinderGoalLookAtPlayer(this, EntityHuman.class, 8.0F));
    }

}

and the summoning part:

HTML:

 @EventHandler
    public void onCreatureSpawn(CreatureSpawnEvent event){
        Entity p = event.getEntity();
        event.setCancelled(true);
        if(event.getSpawnReason() == SpawnReason.BUILD_SNOWMAN){
            System.out.print("spawning da beast");
            Location loc = event.getLocation();
              CraftWorld world = (CraftWorld) event.getLocation().getWorld();
            villager superZombie = new villager(((CraftWorld)world).getHandle());
              superZombie.setPositionRotation(loc.getX(), loc.getY(), loc.getZ(), loc.getYaw(), loc.getPitch());
              ((CraftWorld)loc.getWorld()).getHandle().addEntity(superZombie, SpawnReason.CUSTOM);
            System.out.println("DE BEAST HAS BEEN SPAWNED");
       
       
        }
    }

also i do register the entity onEnable(). thanks in advance

 

@spiroulis
Can you post the link to this tutorial?

What exactly are you trying to do? Are you trying to make the villager move to specific locations?

 

@Zombie_Striker basically what i wanted to do was find a way to make mobs with custom attributes. So i realised i didnt need to override the pathfinders to do that and just simply used the initAttributes() method found in nms. Sadly i could not find the link of the tutorial i had read but my problem is fixed the custom mob spawns and has the attributes i assigned to it. Thank you very much for trying to help tho