Entity Spawning From Item

package net.minecraft.src;

import java.util.Random;

public class SpiderManequin extends Item
{
        public SpiderManequin(int i)
        {
                super(i);
                maxStackSize = 1;
                setMaxDamage(200);
        }
   private World worldObj;

   public boolean onItemUse (ItemStack itemstack, EntityPlayer entityplayer, World world, int i ,int j, int k, int l){
	   if(!world.isRemote)
	   {
		   ModLoader.getMinecraftInstance().thePlayer.addChatMessage("Dirt Slime Summonned!");
		   EntityLiving entityliving = (EntityLiving)EntityList.createEntityByName("Dirt Slime", entityplayer.worldObj);

		   entityliving.setLocationAndAngles(i, j + 1, k, 0F, 0F);
		   entityplayer.worldObj.spawnEntityInWorld(entityliving);
		   entityplayer.swingItem();
	   }

	   return true;


   }
}