plin Ale zur problembehandlun

public class BugPluginClass1 extends JavaPlugin {

    @Override
    public void onEnable() {

        String NameDesPlugins = this.getDescription().getName();

        super.onEnable();

        System.out.println("TESTAUSGABE Plugin " + NameDesPlugins + " 1.0.0 geladen.");
    }

    public static void wartemal(long millis) {
        try {
            Thread.sleep(millis);
        } catch (InterruptedException e) {}
    }

    @Override public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){


         Player player = null ;
         if(sender instanceof Player) {
             player = (Player) sender;
         }

         //Kommandos

         //Kommando Paintballs
         if(cmd.getName().equalsIgnoreCase("pbTB")){


                if (player == null) {

                    sender.sendMessage("Sorry, this only works ingame!");
                    return true;


                } else {
                    player.sendMessage(ChatColor.GREEN + "[PB]" + ChatColor.YELLOW +"Paintball InvLoad Started!");
                    //wartemal(3000);
                    ItemStack item = new ItemStack(Material.LEATHER_CHESTPLATE, 1);
                    ItemMeta met =item.getItemMeta();
                    met.setDisplayName("TeamBlau");
                    item.addEnchantment(Enchantment.BINDING_CURSE, 1);
                    LeatherArmorMeta brustMeta = (LeatherArmorMeta)item.getItemMeta();
                    brustMeta.setColor(Color.BLUE);
                    item.setItemMeta(met);
                    player.getInventory().setChestplate(item);
                    //wartemal(3000);
                    ItemStack PBB = new ItemStack(Material.SNOW_BALL, 32);


                }
                    return false;

                }
}