Hi, I'm trying to make a simple mod that spawns a monster through the forge events, when another entity is killed especially,

the part of the code is like below

@ForgeSubscribe 
public void onDeath(LivingDeathEvent event) 
{
	if(!event.entity.worldObj.isRemote && event.entity instanceof EntitySkeleton) {
		Entity entity = (Entity)event.entity;
		World world = entity.worldObj;
		EntityZombie zomb = new EntityZombie(world);
		world.spawnEntityInWorld(zomb);
		zomb.setPosition(event.entity.posX, event.entity.posY, event.entity.posZ);
	}
}

when the method is called, I can only hear the sound of the zombie around me, but I am not able to see the zombie, the zombie can walk and attack me, but I can't hit back,

Can anyone help me, have any ideas what I did wrong?

sorry for double posting, but I seems to figured it out by myself and to notify others, don't know why, but if you put setlocation method under spawn, it makes the entity invisible, I put it before the spawn method then there's no problem.