Minecraft Plugin Coden - Mineplex Lobby Mobs

package de.DonnerBrecher.Lnrs;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.entity.Skeleton;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageByEntityEvent;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;

public class Warrior implements CommandExecutor, Listener {

    public int timer = 0;
    private Inventory Inv = null;

    @Override
    public boolean onCommand(CommandSender cs, Command cmd, String cmdLabel, String[] args) {
        if (cmd.getName().equalsIgnoreCase("test")) {
            if (cs instanceof Player) {
                Player p = (Player)cs;
                if (p.hasPermission("test.test")) {
                    if (args.length == 0) {
                        final int PosX = 0;
                        final int PosY = 0;
                        final int PosZ = 0;
                        final Location loc = new Location(Bukkit.getWorld(p.getWorld().getName()), PosX, PosY, PosZ);
                        final Skeleton skeleton = (Skeleton)p.getWorld().spawnEntity(loc, EntityType.SKELETON);
                        skeleton.getEquipment().setHelmet(new ItemStack(Material.LEATHER_HELMET));
                        skeleton.getEquipment().setChestplate(new ItemStack(Material.LEATHER_CHESTPLATE));
                        skeleton.getEquipment().setLeggings(new ItemStack(Material.LEATHER_LEGGINGS));
                        skeleton.getEquipment().setBoots(new ItemStack(Material.LEATHER_BOOTS));
                        skeleton.getEquipment().setItemInHand(new ItemStack(Material.CHEST));
                        skeleton.setCustomName("Test");
                        skeleton.setCustomNameVisible(true);

                        timer = Bukkit.getScheduler().scheduleSyncRepeatingTask(Bukkit.getPluginManager().getPlugin("DeinPluginName"), new Runnable() {

                            @Override
                            public void run() {
                                skeleton.teleport(loc);
                            }
                        }, 0L, 10L);

                    }
                } else {
                    p.sendMessage("§cDu hast keine Erlaubnis dies zu tuhen!");
                }
            }
        }
        return false;
    }

    @EventHandler
    public void onDamage(EntityDamageEvent e) {
        if (e.getEntity() instanceof Skeleton) {
            Skeleton skeleton = (Skeleton)e.getEntity();
            if (skeleton.getCustomName().equals("Test")) {
                e.setCancelled(true);
            }
        }
    }

    @EventHandler
    public void onDamage(EntityDamageByEntityEvent e) {
            if (e.getDamager() instanceof Skeleton) {
                Skeleton skeleton = (Skeleton)e.getDamager();
                if (skeleton.getCustomName().equals("Test")) {
                    e.setCancelled(true);
                }
            }
    }

    @EventHandler
    public void onInventoryOpen(EntityDamageByEntityEvent e) {
        if (e.getDamager() instanceof Player) {
            Player p = (Player)e.getDamager();
            if (e.getEntity() instanceof Skeleton) {
                Skeleton skeleton = (Skeleton)e.getEntity();
                if (skeleton.getCustomName().equals("Test")) {
                    Inv = Bukkit.createInventory(null, 9, "DeinInventarName");
                    if (p.hasPermission("test.test")) {
                        p.openInventory(Inv);
                    } else {
                        p.sendMessage("Du hast keine Erlaubnis das Test Inventar zu öffnen!");
                    }
                }
            }
        }
    }
}