Hauptklasse

package main;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.UUID;

import org.bukkit.Bukkit;
import org.bukkit.GameMode;
import org.bukkit.Location;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class Jumping extends JavaPlugin{

    //Strings
    public String noperm = "§cFehler: Du hast keine Rechte!";
    public String prefix = "§4[§6Jumping§4]";

    //HashMaps
    public HashMap<UUID, Location> oldLoc = new HashMap();
    public HashMap<UUID, ItemStack[]> oldItems = new HashMap();
    public HashMap<String, String> arena = new HashMap();
    public HashMap<String, GameMode> gamemode = new HashMap();
    public HashMap<Player, String> jumpnrunPlayers = new HashMap();

    //ArraysLists
    public ArrayList<String> inJump = new ArrayList();

    public void onEnable(){
        System.out.println("[Jumping] v" + getDescription().getVersion() + " | Enable | <Developed by bapf>");
        Config();
        new Listeners(this);
        getCommand("jumping").setExecutor(new Commands(this));
    }

    public void onDisable(){
        System.out.println("[Jumping] v" + getDescription().getVersion() + " | Disable | <Developed by bapf>");
    }

    //Leave Arena
    public void leaveArena(Player p){
        if (this.inJump.contains(p.getName()))
        {
          this.inJump.remove(p.getName());
          p.getInventory().clear();
          ItemStack[] old = (ItemStack[])this.oldItems.get(p.getUniqueId());
          p.getInventory().setContents(old);
          p.updateInventory();
          Location loc = (Location)this.oldLoc.get(p.getUniqueId());
          p.teleport(loc);
          if (this.gamemode.containsKey(p.getName())) {
            p.setGameMode((GameMode)this.gamemode.get(p.getName()));
            FileConfiguration cfg = getConfig();
            if (cfg.getString("notify").equalsIgnoreCase("true")) {
              for (Player all : Bukkit.getOnlinePlayers()) {
                if (all.hasPermission("Jumping.message"))
                {
                  all.sendMessage(prefix + "§7" + p.getName() + "§8 < §7" + arena.get(p.getName()));
                }
              }
            }
          }
          p.sendMessage(this.prefix + "§7Du hast das JumpnRun verlassen!");
          this.jumpnrunPlayers.remove(p);
          arena.remove(p.getName());
          inJump.remove(p.getName());
          gamemode.remove(p.getName());
          oldLoc.remove(p.getUniqueId());
          oldItems.remove(p.getUniqueId());
          jumpnrunPlayers.remove(p.getName());
        }
        else {
          p.sendMessage(this.prefix + "§cDu bist in keinem JumpnRun!");
        }
    }

    //Config
    public void Config(){
        FileConfiguration cfg = getConfig();
        cfg.options().copyDefaults(true);
        saveConfig();
    }

}