MAIN KLASSE:

package main;

import net.md_5.bungee.BungeeCord;
import net.md_5.bungee.api.ProxyServer;
import net.md_5.bungee.api.plugin.Command;
import net.md_5.bungee.api.plugin.Plugin;

public class main extends Plugin {

	private static final Command CMD_Party = null;
	public static String prefix = "§7[§eCrackBurn§7]";
	public static main main;
	public PartyManager pm;


	@Override
	public void onEnable() {

		main = this;
		pm = new PartyManager();
		ProxyServer.getInstance().getPluginManager().registerListener(main, pm);
		BungeeCord.getInstance().pluginManager.registerCommand(this, new CMD_Party(this));

	}

	@Override
	public void onDisable() {

	}


}

CMD_PARTY :

package main;

import net.md_5.bungee.BungeeCord;
import net.md_5.bungee.api.ProxyServer;
import net.md_5.bungee.api.plugin.Command;
import net.md_5.bungee.api.plugin.Plugin;

public class main extends Plugin {

	private static final Command CMD_Party = null;
	public static String prefix = "§7[§eCrackBurn§7]";
	public static main main;
	public PartyManager pm;


	@Override
	public void onEnable() {

		main = this;
		pm = new PartyManager();
		ProxyServer.getInstance().getPluginManager().registerListener(main, pm);
		BungeeCord.getInstance().pluginManager.registerCommand(this, new CMD_Party(this));

	}

	@Override
	public void onDisable() {

	}


}

PARTY :

package main;

import java.util.ArrayList;

import net.md_5.bungee.api.connection.ProxiedPlayer;

public class Party {


	private ProxiedPlayer owner;
	private ArrayList<ProxiedPlayer> player;

	public Party(ProxiedPlayer owner) {
		this.owner = owner;
		player = new ArrayList<ProxiedPlayer>();
		player.add(owner);
		main.main.pm.getParties().add(this);

	}

	public void setOwner(ProxiedPlayer owner) {
		this.owner = owner;
	}

	public ArrayList<ProxiedPlayer> getPlayer() {
		return player;
	}

	public void addPlayer(ProxiedPlayer p) {

		sayToParty(main.prefix + "§7Der Spieler" + p.getDisplayName() + "§7ist der Party beigetreten!");
		player.add(p);
		main.main.pm.getPartyPlayer().put(p, this);
	}

	public void delete() {

		sayToParty(main.prefix + "§cDie Party wurde aufgelöst");
		player.clear();
		main.main.pm.getParties().remove(this);
		if(getPlayer().size() >= 1); {

			if(isOwner(owner)) {
				setOwner(getPlayer().get(0));
				owner.sendMessage(main.prefix + owner.getDisplayName() + "§7ist nun der Leiter der Party");
		} else {

			delete();

		}
	}

	}
	public boolean isOwner(ProxiedPlayer p) {

		if(p.equals(owner)) {
			return true;
		}
		return false;
	}
	public void invitePlayer(ProxiedPlayer p) {

		p.sendMessage(main.prefix + owner.getDisplayName() + "§7hat dich in seine Party eingeladen");
		main.main.pm.getInvitation().put(p, this);

	}

	public void kickPlayer(ProxiedPlayer p) {

		sayToParty(main.prefix + "§cDer Spieler" + p.getDisplayName() + "§cwurde von der party gekickt!");
		player.remove(p);
		main.main.pm.getPartyPlayer().remove(p);

	}

	void sayToParty(String msg) {
		for(ProxiedPlayer pl : player) {
			pl.sendMessage(main.prefix + msg);
		}
	}

	public void removePlayer(ProxiedPlayer p) {

		sayToParty(main.prefix + "§cDer Spieler" + p.getDisplayName() + "§chat die Party verlassen!");
		player.remove(p);
		main.main.pm.getPartyPlayer().remove(p);

	}


}

PARTYMANAGER :

package main;

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


import net.md_5.bungee.api.connection.ProxiedPlayer;
import net.md_5.bungee.api.event.PlayerDisconnectEvent;
import net.md_5.bungee.api.event.ServerSwitchEvent;
import net.md_5.bungee.api.plugin.Listener;
import net.md_5.bungee.event.EventHandler;

public class PartyManager implements Listener {

	private ArrayList<Party> parties;
	private HashMap<ProxiedPlayer, Party> partyPlayer;
	private HashMap<ProxiedPlayer, Party> invitation;


	public PartyManager() {

		parties = new ArrayList<Party>();
		invitation = new HashMap<ProxiedPlayer, Party>();
		partyPlayer = new HashMap<ProxiedPlayer, Party>();

	}

	public ArrayList<Party> getParties() {
		return parties;
	}

	public HashMap<ProxiedPlayer, Party> getPartyPlayer() {
		return partyPlayer;
	}

	public HashMap<ProxiedPlayer, Party> getInvitation() {
		return invitation;
	}

	public boolean isinParty(ProxiedPlayer p) {
		return partyPlayer.containsKey(p);
	}

	public boolean isPartyLeader(ProxiedPlayer p) {
		if(isinParty(p) && partyPlayer.get(p).isOwner(p)) {
			return true;
		}
		return false;
	}


	@EventHandler
	public void onSwitch(ServerSwitchEvent e) {
		ProxiedPlayer p = e.getPlayer();
		if(isPartyLeader(p)) {
			for(ProxiedPlayer member : partyPlayer.get(p).getPlayer()) {
				if(!member.equals(p))
				{
					member.sendMessage(main.prefix + "§aDie Party hat den Server §6" + p.getServer().getInfo().getName() + " §abetreten");
					member.connect(p.getServer().getInfo());
				}
			}
		}
	}

	@EventHandler
	public void onDisconnect(PlayerDisconnectEvent e) {

		ProxiedPlayer p = e.getPlayer();
		if(isinParty(p)) {

			partyPlayer.get(p).removePlayer(p);

		}

	}





}