Hilfe beim Java Plugin

package me.build.blaizerado;


import java.util.HashMap;


import org.bukkit.Bukkit;
import org.bukkit.GameMode;
import org.bukkit.Location;
import org.bukkit.block.Block;
import org.bukkit.block.Sign;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;


public class build extends JavaPlugin implements Listener{


	HashMap<String, ItemStack[]> inventory = new HashMap<>();
	int high = 11;
	int countdown;
	int time = 30;

	String tag = getConfig().getString("Config.tag");

	@Override
	public void onDisable() {
		System.out.println("Penis");
		super.onDisable();
	}


	public Inventory inv = null;

	@Override
	public void onEnable() {

		startSign();
		registerEvents();
		lcomand();
		loadConfig();

		this.getServer().getPluginManager().registerEvents(this, this);

		System.out.println("§4Plugin is On");
		super.onEnable();
	}


	@SuppressWarnings("deprecation")
	@Override
	public boolean onCommand(CommandSender sender, Command cmd, String cmdlabel, String[] args) {
		Player p = (Player) sender;

		if(cmd.getName().equalsIgnoreCase("info")) {
			if(p.hasPermission("build.info")) {
				p.sendMessage("§4Build:");
				p.sendMessage("§2Version: 1.0");
				p.setHealth(20);
				p.setFoodLevel(20);
				p.sendMessage( tag + "Dein Leben & Essen wurden auf 20 gesetzt");
				return true;
			}	

		}
		if(cmd.getName().equalsIgnoreCase("clear")) {
			if(p.hasPermission("build.clear")) {
				p.getInventory().clear();
				p.sendMessage(tag + "Du hast dein Inventory Gecleart");
				return true;
			}
		}
		if(cmd.getName().equalsIgnoreCase("medien")) {
			if(args.length == 0) {
				p.sendMessage(tag + "Benutze: /medien youtube|ts3");
				return true;
			}
			if(args.length == 1) {
			if(p.hasPermission("build.media")) {
				if(args[0].equalsIgnoreCase("youtube")) {
					p.sendMessage(tag + "youtube/blaizerado");
					return true;
				}
				if(args[0].equalsIgnoreCase("ts")) {
					p.sendMessage(tag + "Ts3 ip: ts.Blaiz-Tay.net");
					return true;
				}else {
					p.sendMessage(tag + "Benutze: /medien youtube|ts3");
					return true;
				}
			}
		}else {
			p.sendMessage(tag + "Benutze: /medien youtube|ts3");
			return true;
		}
	}
	if(cmd.getName().equalsIgnoreCase("inv")) {
		if(args.length==0) {
			p.sendMessage( tag + "Benutze: /inv weg|wieder");
		}
		if(args.length == 1) {
		if(p.hasPermission("build.inv")) {
			if(args[0].equalsIgnoreCase("weg")) {
				p.sendMessage( tag + "Du hast dein Inventar verstaut.");
				inventory.put(p.getName(), p.getInventory().getContents());
				p.getInventory().clear();
				return true;
			}
			if(args[0].equalsIgnoreCase("wieder")) {
				p.sendMessage(tag + "Du hast dein Inventar wieder hervor gehollt.");
				ItemStack[] contents = inventory.get(p.getName());
				p.getInventory().setContents(contents);
				return true;
			}
		}
	  }
	}
	if(cmd.getName().equalsIgnoreCase("back")) {
		final Location loc = p.getLocation();
		p.sendMessage(tag + "In 5 Sekunden gehts back.");
		if(p.hasPermission("build.back")) {
			Bukkit.getScheduler().scheduleAsyncDelayedTask(this, new Runnable() {
				@Override
				public void run() {
					p.teleport(loc);
					p.sendMessage("§2[Build]§6 Willkommen back XD.");
				}
			}, 20*5);
			return true;
		}
	}
	if(cmd.getName().equalsIgnoreCase("gmevent")) {
		if(p.hasPermission("build.gmevemt")) {
			p.sendMessage(tag + " Du hast den Countdown gestartet");
			countdown = Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {


				@Override
				public void run() {
					if(high != 0) {
						high--;
						p.sendMessage(tag + "Zeit:" + high +"§6 Sekunden");
						p.setLevel(high);
					}else {
						p.sendMessage(tag + "Dein Gamemode wurde geandert");
						p.setGameMode(GameMode.CREATIVE);
						Bukkit.getScheduler().cancelTask(countdown);

						int herz = getConfig().getInt("Config.lives");
						p.setHealth(herz);

					}
				}

			}, 0, 20);
		}
	}
	return false;
	}
	public void loadConfig() {
		getConfig().options().copyDefaults(true);
		saveConfig();
	}
	public void registerEvents() {
		new joinlist(this);
		new onLeav(this);
		new OnKick(this);
		new ArrowExplode(this);
		new InteractivListener(this);
		new iteminvlistener(this);
	}
	public void lcomand() {
		healcommand chealcommand = new healcommand(this);
		getCommand("heal").setExecutor(chealcommand);

		Item cItem = new Item(this);
		getCommand("item").setExecutor(cItem);

		CreatSpawn cCreatSpawn = new CreatSpawn(this);
		getCommand("mob").setExecutor(cCreatSpawn);

		FireworkCommand cFireworkCommand = new FireworkCommand(this);
		getCommand("firework").setExecutor(cFireworkCommand);

		Teleportcommand cTeleportcommand = new Teleportcommand(this);
		getCommand("teleport").setExecutor(cTeleportcommand);

		homecmd chomecmd = new homecmd(this);
		getCommand("sethome").setExecutor(chomecmd);

		mchomecmd cmchomecmd = new mchomecmd(this);
		getCommand("home").setExecutor(cmchomecmd);

		gmcommand gmcommand = new gmcommand(this);
		getCommand("gm").setExecutor(gmcommand);

		signcmd csigncmd = new signcmd(this);
		getCommand("gm").setExecutor(csigncmd);
	}
	public void startSign() {
		String world = this.getConfig().getString("Sign.world");
		double x = this.getConfig().getDouble("Sign.x");
		double y = this.getConfig().getDouble("Sign.y");
		double z = this.getConfig().getDouble("Sign.z");

		Location loc = new Location(Bukkit.getWorld(world),x,y,z);
		Block b = loc.getBlock();

		if(b.getState() instanceof Sign) {
			final Sign s = (Sign) b.getState();

			Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {


				@Override
				public void run() {
					if(time != 0) {
						time --;
					}
					if(time ==29) {
						s.setLine(1,"Ts:Blaiz-tay.net");
						s.update();
					}
					if(time ==28) {
						s.setLine(1,"   Blaiz-tay.net");
						s.update();
					}
					if(time ==27) {
						s.setLine(1,"      Willkommen");
						s.setLine(2,"             auf");
						s.setLine(3,"   Blaiz-tay.net");
						s.update();
					}
					if(time ==26) {
						s.setLine(1,"      Willkommen");
						s.setLine(2,"             auf");
						s.setLine(3,"   Blaiz-tay.net");
						s.update();
					}
					if(time ==25) {
						s.setLine(1,"      Willkommen");
						s.setLine(2,"             auf");
						s.setLine(3,"   Blaiz-tay.net");
						s.update();
					}
					if(time ==24) {
						s.setLine(1,"    Wir wünschen");
						s.setLine(2,"       	 euch");
						s.setLine(3,"      Viel Spass");
						s.update();
					}	
					if(time ==23) {
						s.setLine(1,"    Wir wünschen");
						s.setLine(2,"       	 euch");
						s.setLine(3,"      Viel Spass");
						s.update();
					}
					if(time ==22) {
						s.setLine(1,"    Wir wünschen");
						s.setLine(2,"       	 euch");
						s.setLine(3,"      Viel Spass");
						s.update();
					}
					if(time ==21) {
						s.setLine(1,"    Wir wünschen");
						s.setLine(2,"       	 euch");
						s.setLine(3,"      Viel Spass");
						s.update();
					}
					if(time ==20) {
						s.setLine(1, "     Kein VIP !");
						s.update();
						time = 30;
					}

				}

			}, 8, 8);

		}
	}
}