public class main extends JavaPlugin implements Listener
{
    public static Bukkit plugin;
    public void onEnable()
    {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);

        Bukkit.getConsoleSender().sendMessage(ChatColor.DARK_RED + "Enabled!");
    }

    public void onDisable()
    {
        getLogger();
        Bukkit.getConsoleSender().sendMessage(ChatColor.DARK_RED + "Disabled!");
    }

    @EventHandler
    public void onPlayerMove(PlayerMoveEvent event)
    {
        Player p = event.getPlayer();
        {
            if (event.getPlayer().getLocation().getWorld().getName().endsWith("nether"))
            {
                if (event.getPlayer().getLocation().getY() > 127)
                {
                    World nether = Bukkit.getWorld("world_nether");
                    p.teleport(nether.getSpawnLocation());
                }
            }
        }
    }
}