GUI problems

So I am making a kits plugin and I am getting 2 errors.

The first error is when I click on a empty slot in my inventory or the GUI (Or take a block from the creative menu and put it in my inventory(Have not tried with chests/furnaces)):

Code:

[00:22:33] [Server thread/ERROR]: Could not pass event InventoryClickEvent to kits v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:486) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:471) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:1361) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.a(SourceFile:32) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.handle(SourceFile:10) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:655) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
Caused by: java.lang.NullPointerException
    at me.nite.kits.Listeners.ClickInv.onClick(ClickInv.java:67) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:318) ~[craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    ... 13 more

Second error is when I throw a item out of my Inventory (either in the GUI or just in my Inventory before I click the paper), also when I click anywhere outside of the my the Inventory/GUI when after clicking the paper

Code:

[00:26:58] [Server thread/ERROR]: Could not pass event InventoryCreativeEvent to kits v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:486) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:471) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:1483) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInSetCreativeSlot.a(SourceFile:23) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInSetCreativeSlot.handle(SourceFile:9) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:655) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
Caused by: java.lang.NullPointerException
    at me.nite.kits.Listeners.ClickInv.onClick(ClickInv.java:64) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:318) ~[craftbukkit-1.7.2-R0.4-20140212.071124-2.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3022jnks]
    ... 13 more

Here is my Listener class where I believe all the errors are happening:

Code:java

package me.dc.kits.Listeners;
 
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.block.Action;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
 
import java.util.Arrays;
 
public class ClickInv implements Listener {
 
Inventory inv = Bukkit.createInventory(null, 27, ChatColor.GOLD + "" + ChatColor.BOLD + "Select your kit!");
 
@EventHandler
public void onPlayerInteract(PlayerInteractEvent e) {
Player player = e.getPlayer();
 
ItemStack kit1 = new ItemStack(Material.COAL);
ItemMeta kit1meta = kit1.getItemMeta();
kit1meta.setDisplayName(ChatColor.RED + "Kit: 1");
kit1meta.setLore(Arrays.asList(ChatColor.AQUA + "Price coming soon!"));
 
kit1.setItemMeta(kit1meta);
 
ItemStack kit2 = new ItemStack(Material.COAL);
ItemMeta kit2meta = kit2.getItemMeta();
kit2meta.setDisplayName(ChatColor.RED + "Kit: 2");
kit2meta.setLore(Arrays.asList(ChatColor.AQUA + "Price coming soon!"));
 
kit2.setItemMeta(kit2meta);
 
inv.setItem(0, kit1);
inv.setItem(1, kit2);
 
if (player.getInventory().getItemInHand().getType() != Material.PAPER) return;
 
if (e.getAction() == Action.RIGHT_CLICK_AIR || e.getAction() == Action.RIGHT_CLICK_BLOCK && player.getItemInHand().getType() == Material.PAPER) {
 
player.openInventory(inv);
}
}
 
@EventHandler
public void onClick(InventoryClickEvent event) {
 
if (!event.getCurrentItem().hasItemMeta())
event.setCancelled(false);
ItemMeta meta = event.getCurrentItem().getItemMeta();
if (!meta.hasDisplayName())
event.setCancelled(false);
 
if (event.getCurrentItem().hasItemMeta()) {
if (event.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.RED + "Kit: 1")) {
event.setCancelled(true);
event.getWhoClicked().closeInventory();
}
 
}
}
}
 

 

Possibly because the current item is null?

 

This isn't going to directly answer your question and you may wish to continue with what you're doing, however I really suggest that you use "AMPMenus" click me for the GitHub and me for the Bukkit post.

Enjoy

 

before checking what the item is, add this:

Code:

if(event.getCurrentItem().getType() != null) {

The console gives nullPointerExceptions that are probably caused by if the item isnt null

 

megamichiel The type will never be null. However, getCurrentItem() might be.

 

fireblast709 Ye, I wasn't sure though if it was getType() that would be null or getCurrentItem()