Registering custom mobs without replacing the default ones.

Hello.
I am having problem where when I register my custom mobs, then default ones are getting the same values/effects what custom mobs have. Sorry, I don't know how to explain it nicely.

Anyways I used this code to register my custom mobs, but then the other default minecraft mobs are affected also.. But I would like to spawn in these custom mobs by myself whenever I want:

Code:

    public void registerEntity(String name, int id, Class<? extends EntityInsentient> nmsClass, Class<? extends EntityInsentient> customClass) {
        try {
            List<Map<?, ?>> dataMaps = new ArrayList<Map<?, ?>>();
            for (Field f : EntityTypes.class.getDeclaredFields()) {
                if (f.getType().getSimpleName().equals(Map.class.getSimpleName())) {
                    f.setAccessible(true);
                    dataMaps.add((Map<?, ?>) f.get(null));
                }
            }
            if (dataMaps.get(2).containsKey(id)) {
                dataMaps.get(0).remove(name);
                dataMaps.get(2).remove(id);
            }

            Method method = EntityTypes.class.getDeclaredMethod("a", Class.class, String.class, int.class);
            method.setAccessible(true);
            method.invoke(null, customClass, name, id);

            for (Field f : BiomeBase.class.getDeclaredFields()) {
                if (f.getType().getSimpleName().equals(BiomeBase.class.getSimpleName())) {
                    if (f.get(null) != null) {
                        for (Field list : BiomeBase.class.getDeclaredFields()) {
                            if (list.getType().getSimpleName().equals(List.class.getSimpleName())) {
                                list.setAccessible(true);
                                @SuppressWarnings("unchecked")
                                List<BiomeMeta> metaList = (List<BiomeMeta>) list.get(f.get(null));

                                for (BiomeMeta meta : metaList) {
                                    Field clazz = BiomeMeta.class.getDeclaredFields()[0];
                                    if (clazz.get(meta).equals(nmsClass)) {
                                        clazz.set(meta, customClass);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {}
    }

 

Using reflection, you can access Maps c,d,f and g in EntityTypes, and add your entity/id to them.
Method to get the fields from EntityTypes (replacing "version" with v1_8R3 or whatever your version is):

Code:

protected static Field mapStringToClassField, mapClassToStringField, mapClassToIdField, mapStringToIdField;
    static {
        try {
            mapStringToClassField = net.minecraft.server.version.EntityTypes.class.getDeclaredField("c");
            mapClassToStringField = net.minecraft.server.version.EntityTypes.class.getDeclaredField("d");
            mapClassToIdField = net.minecraft.server.version.EntityTypes.class.getDeclaredField("f");
            mapStringToIdField = net.minecraft.server.version.EntityTypes.class.getDeclaredField("g");

            mapStringToClassField.setAccessible(true);
            mapClassToStringField.setAccessible(true);
            mapClassToIdField.setAccessible(true);
            mapStringToIdField.setAccessible(true);
        }
        catch(Exception e) {e.printStackTrace();}
    }

Now the method to put the values in EntityTypes maps.

Code:

public static void addCustomEntity(Class entityClass, String name, int id) {
if (mapStringToClassField == null || mapStringToIdField == null || mapClassToStringField == null || mapClassToIdField == null) {
return;} else {
try {
Map mapStringToClass = (Map) mapStringToClassField.get(null);Map mapStringToId = (Map) mapStringToIdField.get(null);Map mapClassToString = (Map) mapClassToStringField.get(null);Map mapClassToId = (Map) mapClassToIdField.get(null);mapStringToClass.put(name, entityClass);mapStringToId.put(name, Integer.valueOf(id));mapClassToString.put(entityClass, name);mapClassToId.put(entityClass, Integer.valueOf(id));}
catch (Exception e) {
e.printStackTrace();}
}
}

And finally, spawning your custom mob:

Code:

net.minecraft.server.version.World nmsWorld = ((CraftWorld) loc.getWorld()).getHandle();
YourCustomClass mob = new YourCustomClass(loc.getWorld(), owner);
mob.setPosition(x, y, z);
nmsWorld.addEntity(mob);
org.bukkit.entity.Entity bukkitEntity = (org.bukkit.entity.Entity) mob.getBukkitEntity(); 

All code+methods courtesy of: https://www.spigotmc.org/threads/tutorial-creating-custom-entities-with-pathfindergoals.18519/