Console Spam

CaveBoy36 · Sep 4, 2015

Hey! I made a simple shop plugin where the player clicks what they want to buy in a shopgui. It works perfectly but the console gets spammed with some error everytime something is clicked in that inventory. Can someone help?
Error:

Code:

[00:00:49] [Server thread/ERROR]: Could not pass event InventoryCreativeEvent to Economy vv1.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1776) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PacketPlayInSetCreativeSlot.a(SourceFile:23) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PacketPlayInSetCreativeSlot.a(SourceFile:9) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_51]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_51]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:714) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [minecraft_server.jar:git-Spigot-fdc1440-53fac9f]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_51]
Caused by: java.lang.NullPointerException
at me.CaveBoy36.Economy.EconomyListener.onInventoryClick(EconomyListener.java:103) ~[?:?]
at sun.reflect.GeneratedMethodAccessor205.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_51]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_51]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[minecraft_server.jar:git-Spigot-fdc1440-53fac9f]

Code:

        else if (e.getSlot() == 11 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Black Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 15);
            e.setCancelled(true);
            WoolBuy(player, "Black Wool", wool);
            e.setCancelled(true);
        }

SkyleTyler1337 · Sep 4, 2015

@CaveBoy36 which line is.

Code:

at me.CaveBoy36.Economy.EconomyListener.onInventoryClick(EconomyListener.java:103)

CaveBoy36 · Sep 4, 2015

@SkyleTyler1337 Hmm, I didn't think this was the problem, but this:

Code:

        else if (e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.GRAY + "Go Back")) {
        if (e.getSlot() == 31 || e.getSlot() == 40) {
            Player player = (Player) e.getWhoClicked();
            if (e.getSlot() == 31) {
            Main.Shop(player);
            }
            else if (e.getSlot() == 40) {
                Main.BuyMenu(player);
            }
            e.setCancelled(true);
        }
    }

Line 1 is 103

SkyleTyler1337 · Sep 4, 2015

is there a full class? of the Listener @CaveBoy36

CaveBoy36 · Sep 4, 2015

@SkyleTyler1337

Code:

package me.CaveBoy36.Economy;

import net.md_5.bungee.api.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.event.player.PlayerKickEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.inventory.ItemStack;

public class EconomyListener implements Listener{
    public Main plugin;
    public EconomyListener(Main plugin) {
        this.plugin = plugin;
    }
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e) {
        Player player = (Player) e.getPlayer();
        if (plugin.getConfig().contains("economy." + player.getName())) {
            Main.money.put(player.getName(), (Integer) plugin.getConfig().get("economy." + player.getName()));
        }
        else {
            return;
        }
    }
    @EventHandler
    public void onPlayerQuit(PlayerQuitEvent e) {
        Player player = (Player) e.getPlayer();
        plugin.getConfig().set("economy." + player.getName(), Main.money.get(player.getName()));
        plugin.saveConfig();
    }
    @EventHandler
    public void onPlayerKick(PlayerKickEvent e) {
        Player player = (Player) e.getPlayer();
        plugin.getConfig().set("economy." + player.getName(), Main.money.get(player.getName()));
        plugin.saveConfig();
    }

    public void ClayBuy(Player p, String s, ItemStack i) {
        if (Main.money.get(p.getName()) >= 30) {
        if (p.getInventory().firstEmpty() != -1) {
         Main.money.put(p.getName(), Main.money.get(p.getName()) - 30);
            p.sendMessage(ChatColor.GRAY + "You just bought 16 " + ChatColor.DARK_AQUA + s + ChatColor.GRAY + " for " + ChatColor.DARK_AQUA + "$30" + ChatColor.GRAY + "!");
            p.getInventory().addItem(i);
        }
        else {
            if (p.getInventory().first(i.getType()) != -1) {
                if (!(p.getInventory().containsAtLeast(new ItemStack(i.getType()), 49))) {
                     Main.money.put(p.getName(), Main.money.get(p.getName()) - 30);
                        p.sendMessage(ChatColor.GRAY + "You just bought 16 " + ChatColor.DARK_AQUA + s + ChatColor.GRAY + " for " + ChatColor.DARK_AQUA + "$30" + ChatColor.GRAY + "!");
                        p.getInventory().addItem(i);
                    }
                else {
                    p.sendMessage(ChatColor.RED + "Your inventory is full!");
                }
            } else {
                p.sendMessage(ChatColor.RED + "Your inventory is full!");
            }
        }
    }
        else {
            p.sendMessage(ChatColor.RED + "You don't have " + ChatColor.DARK_RED + "$30");
        }
    }
    public void WoolBuy(Player p, String s, ItemStack i) {
        if (Main.money.get(p.getName()) >= 15) {
        if (p.getInventory().firstEmpty() != -1) {
         Main.money.put(p.getName(), Main.money.get(p.getName()) - 15);
            p.sendMessage(ChatColor.GRAY + "You just bought 4 " + ChatColor.DARK_AQUA + s + ChatColor.GRAY + " for " + ChatColor.DARK_AQUA + "$15" + ChatColor.GRAY + "!");
            p.getInventory().addItem(i);
        }
        else {
            if (p.getInventory().first(i.getType()) != -1) {
                if (!(p.getInventory().containsAtLeast(new ItemStack(i.getType()), 61))) {
                     Main.money.put(p.getName(), Main.money.get(p.getName()) - 15);
                        p.sendMessage(ChatColor.GRAY + "You just bought 4 " + ChatColor.DARK_AQUA + s + ChatColor.GRAY + " for " + ChatColor.DARK_AQUA + "$15" + ChatColor.GRAY + "!");
                        p.getInventory().addItem(i);
                    }
                else {
                    p.sendMessage(ChatColor.RED + "Your inventory is full!");
                }
            }
            else {
                p.sendMessage(ChatColor.RED + "Your inventory is full!");
            }
        }
    }
        else {
            p.sendMessage(ChatColor.RED + "You don't have " + ChatColor.DARK_RED + "$15");
        }
    }
    @EventHandler
    public void onInventoryClick(InventoryClickEvent e) {
        if (e.getSlot() == 2 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Buy")) {
        Player player = (Player) e.getWhoClicked();
        Main.BuyMenu(player);
        e.setCancelled(true);
        }
        else if (e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.GRAY + "Go Back")) {
        if (e.getSlot() == 31 || e.getSlot() == 40) {
            Player player = (Player) e.getWhoClicked();
            if (e.getSlot() == 31) {
            Main.Shop(player);
            }
            else if (e.getSlot() == 40) {
                Main.BuyMenu(player);
            }
            e.setCancelled(true);
        }
    }
        else if (e.getSlot() == 10 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Hardened Clay")) {
            Player player = (Player) e.getWhoClicked();
            e.setCancelled(true);
            Main.Clay(player);
        }
        else if (e.getSlot() == 11 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "White Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 0);
            e.setCancelled(true);
            ClayBuy(player, "White Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 12 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Orange Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 1);
            e.setCancelled(true);
            ClayBuy(player, "Orange Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 13 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Magenta Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 2);
            e.setCancelled(true);
            ClayBuy(player, "Magenta Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 14 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Light Blue Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 3);
            e.setCancelled(true);
            ClayBuy(player, "Light Blue Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 15 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Yellow Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 4);
            e.setCancelled(true);
            ClayBuy(player, "Yellow Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 19 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Hardened Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.HARD_CLAY, 16);
            e.setCancelled(true);
            ClayBuy(player, "White Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 20 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Lime Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 5);
            e.setCancelled(true);
            ClayBuy(player, "Lime Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 21 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Pink Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 6);
            e.setCancelled(true);
            ClayBuy(player, "Pink Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 22 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Gray Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 7);
            e.setCancelled(true);
            ClayBuy(player, "Gray Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 23 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Light Gray Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 8);
            e.setCancelled(true);
            ClayBuy(player, "Light Gray Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 24 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Cyan Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 9);
            e.setCancelled(true);
            ClayBuy(player, "Cyan Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 25 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Black Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 15);
            e.setCancelled(true);
            ClayBuy(player, "Black Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 29 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Purple Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 10);
            e.setCancelled(true);
            ClayBuy(player, "Purple Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 30 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Blue Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 11);
            e.setCancelled(true);
            ClayBuy(player, "Blue Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 31 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Brown Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 12);
            e.setCancelled(true);
            ClayBuy(player, "Brown Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 32 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Green Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 13);
            e.setCancelled(true);
            ClayBuy(player, "Green Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 33 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Red Stained Clay")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack clay = new ItemStack(Material.STAINED_CLAY, 16);
            clay.setDurability((short) 14);
            e.setCancelled(true);
            ClayBuy(player, "Red Stained Clay", clay);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 11 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Wools")) {
            Player player = (Player) e.getWhoClicked();
            e.setCancelled(true);
            Main.Wool(player);
        }
        else if (e.getSlot() == 11 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "White Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 0);
            e.setCancelled(true);
            WoolBuy(player, "White Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 12 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Orange Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 1);
            e.setCancelled(true);
            WoolBuy(player, "Orange Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 13 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Magenta Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 2);
            e.setCancelled(true);
            WoolBuy(player, "Magenta Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 14 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Light Blue Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 3);
            e.setCancelled(true);
            WoolBuy(player, "Light Blue Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 15 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Yellow Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 4);
            e.setCancelled(true);
            WoolBuy(player, "Yellow Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 19 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "White Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 0);
            e.setCancelled(true);
            WoolBuy(player, "White Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 20 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Lime Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 5);
            e.setCancelled(true);
            WoolBuy(player, "Lime Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 21 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Pink Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 6);
            e.setCancelled(true);
            WoolBuy(player, "Pink Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 22 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Gray Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 7);
            e.setCancelled(true);
            WoolBuy(player, "Gray Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 23 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Light Gray Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 8);
            e.setCancelled(true);
            WoolBuy(player, "Light Gray Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 24 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Cyan Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 9);
            e.setCancelled(true);
            WoolBuy(player, "Cyan Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 25 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "White Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 0);
            e.setCancelled(true);
            WoolBuy(player, "White Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 29 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Purple Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 10);
            e.setCancelled(true);
            WoolBuy(player, "Purple Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 30 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Blue Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 11);
            e.setCancelled(true);
            WoolBuy(player, "Blue Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 31 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Brown Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 12);
            e.setCancelled(true);
            WoolBuy(player, "Brown Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 32 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Green Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 13);
            e.setCancelled(true);
            WoolBuy(player, "Green Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 33 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Red Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 14);
            e.setCancelled(true);
            WoolBuy(player, "Red Wool", wool);
            e.setCancelled(true);
        }
        else if (e.getSlot() == 11 && e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.DARK_AQUA + "Black Wool")) {
            Player player = (Player) e.getWhoClicked();
            ItemStack wool = new ItemStack(Material.WOOL, 4);
            wool.setDurability((short) 15);
            e.setCancelled(true);
            WoolBuy(player, "Black Wool", wool);
            e.setCancelled(true);
        }
        else {
            return;
        }
       
    }

}

timtower · Sep 4, 2015

@CaveBoy36 Could you post your full server log using http://pastebin.com ?

caderape · Sep 5, 2015

@CaveBoy36
e.getCurrentItem().getItemMeta().getDisplayName();

I guess it might be your error. If a clicked item is null or don't have a displayname, it will throw an error.

stefvanschie · Sep 5, 2015

@CaveBoy36 The item doesn't have itemmeta and that's why it's given you a npe. Check first if the item has itemmeta.

boomboompower · Sep 5, 2015

@CaveBoy36 for future problems, learn how to read stacktraces by, checking this thread http://bukkit.org/threads/how-to-re...ubleshoot-your-own-plugins-by-yourself.32457/

stormneo7 · Sep 5, 2015

Code:
e.getCurrentItem().getItemMeta().getDisplayName().equals(ChatColor.GRAY + "Go Back")
Code:
Caused by: java.lang.NullPointerException
The item in question might not have an Item Meta.
The item in question might not have a Display Name either.
You need to do null checks for both, ItemMeta before DisplayName.
There're also methods such as .hasItemMeta() and .getItemMeta().hasDisplayName()

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