"Listener already listening"

Whenever I Join My Server With this plugin enabled, I get a console error and get disconnected.

Error:

Code:

[17:49:23 WARN]: Failed to handle packet for /127.0.0.1:51989

java.lang.IllegalArgumentException: Listener already listening

    at net.minecraft.server.v1_8_R3.Container.addSlotListener(Container.java:55) ~[craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.EntityPlayer.syncInventory(EntityPlayer.java:159) ~[craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:159) ~[craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:115) ~[craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:53) ~[craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:222) ~[craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.ServerConnection.c(SourceFile:168) [craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:744) [craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335) [craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:628) [craftbukkit.jar:git-Bukkit-880a532]

    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:536) [craftbukkit.jar:git-Bukkit-880a532]

    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]

My Code:

Code:

package com.Y_U_NO_DIG



import org.bukkit.Bukkit;

import org.bukkit.ChatColor;

import org.bukkit.Material;

import org.bukkit.entity.Player;

import org.bukkit.event.EventHandler;

import org.bukkit.event.Listener;

import org.bukkit.event.inventory.InventoryClickEvent;

import org.bukkit.event.player.PlayerJoinEvent;

import org.bukkit.inventory.Inventory;

import org.bukkit.inventory.ItemStack;

import org.bukkit.inventory.meta.ItemMeta;

import org.bukkit.plugin.java.JavaPlugin;



public class AgesClash extends JavaPlugin implements Listener{

 

    public static Inventory chooseClass = Bukkit.createInventory(null,27,"ChooseClass");

 

    public void onEnable(){

        getLogger().info("The Plugin Is Enabled!");

        Bukkit.getServer().getPluginManager().registerEvents(this, this);

    }

 

 

 

 

    public static void createDisplay(Material material, Inventory inv, String name) {

     

        ItemStack ironBladeIcon = new ItemStack(Material.IRON_SWORD);

        ItemStack trembleHawkIcon = new ItemStack(Material.BOW);

        ItemStack nightCloakIcon = new ItemStack(Material.LEATHER_CHESTPLATE);

     

        ItemMeta ironBladeMeta = ironBladeIcon.getItemMeta();

        ironBladeMeta.setDisplayName(ChatColor.DARK_GRAY + "Iron" + ChatColor.DARK_RED + "Blade");

     

        ItemMeta trembleHawkMeta = trembleHawkIcon.getItemMeta();

        trembleHawkMeta.setDisplayName(ChatColor.GREEN + "Tremble" + ChatColor.GOLD + "Hawk");

     

        ItemMeta nightCloakMeta = nightCloakIcon.getItemMeta();

        nightCloakMeta.setDisplayName(ChatColor.DARK_BLUE + "Night" + ChatColor.DARK_GRAY + "Cloak");

     

     

        ironBladeIcon.setItemMeta(ironBladeMeta);

        trembleHawkIcon.setItemMeta(trembleHawkMeta);

        nightCloakIcon.setItemMeta(nightCloakMeta);

     

        chooseClass.setItem(2, ironBladeIcon);

        chooseClass.setItem(5, ironBladeIcon);

        chooseClass.setItem(7, ironBladeIcon);

    }

 

 

 

 

 

    @EventHandler

    public void onJoin(PlayerJoinEvent e){

        Player player = e.getPlayer();

        player.openInventory(chooseClass);

    }

 

 

    public void clickInv(InventoryClickEvent e){

        Player player =(Player) e.getWhoClicked();

        ItemStack clicked = e.getCurrentItem();

        Inventory currentInv = e.getInventory();

        if (currentInv.getName().equals(chooseClass.getName())) {

            if(clicked.getType() == Material.IRON_SWORD) {

                e.setCancelled(true);

            player.closeInventory();

         

         

         

         

            }else{

             

                if(clicked.getType() == Material.BOW) {

                e.setCancelled(true);

                player.closeInventory();

         

             

                 

                }else {

                 

                    if(clicked.getType() == Material.LEATHER_CHESTPLATE) {

                        e.setCancelled(true);

                        player.closeInventory();

                 

                     

                 

                 

                }

             

        }

         

        }

     

     

    }

 

 

}

}



  

Anyone know why? Thank You!

 

Your inventory has no InventoryHolder passed along to it? Is that even allowed?

 

I am quite new to Bukkit, how would I pass an InventoryHolder?

 

Do you have basic knowledge of Java?

 

@Y_U_NO_DIG Setting an InventoryHolder to null is fine, Try making a BukkitRunnable and then executing the code, the players inventory may not be fully loaded in.

 

@Y_U_NO_DIG, please see this thread. You are violating the correct domain for a bukkit project, which can cause a LOT of issues, plus it basically says that you created bukkit, which isn't true. http://bukkit.org/threads/on-namespaces-please-do-not-use-bukkit-in-your-plugins.3732/

As far as the OP, You need to set a delayed task. You cannot open an inventory in the onJoin method.

 

Thanks for the help everyone, and sorry Tecno_Wizard I wasn't aware if that.

 

@Y_U_NO_DIG your code is so spaced out ;p

 

@boomboompower, more often than not the copy and paste causes that, not because it is written like that.

 

Yes, it's allowed.