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我现在正在尝试做服务器交换器，但我无法传送。

Serverart：BungeeCord，纸

版本：1.15.2 这是我的问题

If I try to use out.writeUTF("connect"); out.writeUTF("lobby"); the out got gets an error

但是这是我的代码

PS：我可以打开库存，但可以从中提取所有物品。

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
public class challangewindow implements CommandExecutor {


private final String GUI_NAME = "NAME";

public void openGUI(Player player) {
    Inventory inventory = Bukkit.createInventory(null, 9 * 1, GUI_NAME);
    inventory.setItem(3,new ItemStack(Material.NETHER_STAR));
    inventory.setItem(5, new ItemStack(Material.FIREWORK_STAR));
    player.openInventory(inventory);
}
@Override
public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
    Player p = (Player) sender;
        if (!p.hasPermission("mommde.chwi")) {
            p.sendMessage(ChatColor.RED + "KEINE RECHTE!");
            return false;
        } else {
            openGUI(p);
        }
        return true;
    }



    @EventHandler
public void handleNavigatorGUIClick(InventoryClickEvent e) {
    if(!(e.getWhoClicked() instanceof Player)) return;
    Player p = (Player) e.getWhoClicked();
        if(e.getView().getTitle().equals(GUI_NAME)) {
            e.setCancelled(true);
            switch (e.getCurrentItem().getType()) {
                case NETHER_STAR:
                    p.sendMessage(ChatColor.GRAY + "Server :");
                    p.closeInventory();
                    break;
                case FIREWORK_STAR:
                    p.sendMessage("test");
                    p.closeInventory();
                    break;
                default:
                    p.sendMessage("NIX");
                    break;
            }
        }
    }

}

Java Minecraft服务器切换器