joinevent

@EventHandler
	public void onJoinFFA(PlayerJoinEvent e){
		Player p = e.getPlayer();

		String message = cfg.getString("messages.JoinMessage");
        message = message.replaceAll("%player%", p.getName());
        e.setJoinMessage(ChatColor.translateAlternateColorCodes('&', message));

main

package de.manugun.ffa;

import java.io.File;
import java.io.IOException;

import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin{

	public static String prefix = "§8[§aFFA§8] §7";

	public void onEnable(){
		loadListeners();
		loadCommands();
		createFile();
		}

	private void loadCommands() {
		getCommand("reload").setExecutor(new ReloadCommand());
		getCommand("setspawn").setExecutor(new SetSpawnCommand());
		getCommand("spawn").setExecutor(new SpawnCommand());
		getCommand("ping").setExecutor(new PingCommand());
		getCommand("ffa").setExecutor(new FFACommand());
		getCommand("shop").setExecutor(new ShopCommand());
		getCommand("addcoins").setExecutor(new AddCoinsCommand());
		getCommand("stats").setExecutor(new StatsCommand());
		getCommand("coins").setExecutor(new CoinsCommand());
		getCommand("setshop").setExecutor(new setVillagerShop());
	}

	private void loadListeners() {

		getServer().getPluginManager().registerEvents(new JoinEvent(), this);
		getServer().getPluginManager().registerEvents(new BuildEvent(), this);
		getServer().getPluginManager().registerEvents(new FoodEvent(), this);
		getServer().getPluginManager().registerEvents(new KillEvent(), this);
		getServer().getPluginManager().registerEvents(new RespawnListener(), this);
		getServer().getPluginManager().registerEvents(new KillstreakEvent(), this);
		getServer().getPluginManager().registerEvents(new ShopCommand(), this);
		getServer().getPluginManager().registerEvents(new VillagerShop(), this);


		getServer().getPluginManager().registerEvents(new CoinManager(), this);
		getServer().getPluginManager().registerEvents(new StatsManager(), this);
	}

	 public static void createFile() {
	        File file = new File("plugins//FFA//messages.yml");
	        File ordner = new File("plugins//FFA");

	        if(!ordner.exists()) {
	            ordner.mkdirs();
	        }
	        if(!file.exists()) {
	            try {
	                file.createNewFile();
	            } catch (IOException e) {
	                e.printStackTrace();
	            }
	            YamlConfiguration cfg = YamlConfiguration.loadConfiguration(file);

	            cfg.addDefault("Messages.JoinMessage", "&8[&aFFA&8] &a%player% &7hat FFA betreten");

	            cfg.options().copyDefaults(true);

	            try {
	                cfg.save(file);
	            } catch (IOException e) {
	                e.printStackTrace();
	            }
	        }

	    }

	 }