Solved Error: Item cannot be null

Hey, so I'm a beginner at this so this might be dumb, but I was making a custom command that gives a custom item and then I saw this error in my server logs. Any ideas how to fix it?

Error:

Code:

[20:19:06 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'magicwand' in plugin MegaPlugin v0.1.3
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at java.base/java.lang.Thread.run(Thread.java:831) [?:?]
Caused by: java.lang.IllegalArgumentException: Item cannot be null
        at org.apache.commons.lang.Validate.noNullElements(Validate.java:364) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.inventory.CraftInventory.addItem(CraftInventory.java:265) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        at me.deluck1est.megaplugin.commands.WandCommand.onCommand(WandCommand.java:19) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
        ... 15 more

 

Stack traces usually tell you everything you need to know. Do me a favor and learn reading them. And without knowing your code we can't help you anyways just by looking at the error.

 

So, I'm guessing the error is caused by class "WandCommand" at line 19?

Code:

package me.deluck1est.megaplugin.commands;

import me.deluck1est.megaplugin.CustomItems;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

public class WandCommand implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (command.getName().equalsIgnoreCase("magicwand")) {
            if (sender instanceof Player) {
                Player player = (Player) sender;

                if (sender.isOp()) {
                    player.getInventory().setItemInHand(CustomItems.wand);
                    player.sendMessage(ChatColor.GOLD + "Successfully gave " + ChatColor.GRAY + player.getDisplayName() + ChatColor.GOLD + " " + CustomItems.wand.getAmount() + ChatColor.AQUA + " Magic Wand" + ChatColor.GOLD + ".");
                }
            }
        }

        return true;
    }

}

 

Check if customitem.wand is null and it is that's the reason you're getting an error.

 

I don't think it is, though.

Code:

package me.deluck1est.megaplugin;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.inventory.ItemFlag;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

import java.util.ArrayList;
import java.util.List;

public class CustomItems {

    public static ItemStack wand;

    public static void init() {
        createWand();
    }

    private static void createWand() {
        ItemStack item = new ItemStack(Material.STICK, 1);
        ItemMeta meta = item.getItemMeta();
        List<String> lore = new ArrayList<>();

        meta.setDisplayName(ChatColor.AQUA + "Magic Wand");
        lore.add(ChatColor.ITALIC + "" + ChatColor.GRAY + "launch");
        meta.setLore(lore);
        meta.addEnchant(Enchantment.KNOCKBACK, 1, false);
        meta.addItemFlags(ItemFlag.HIDE_ENCHANTS);
        item.setItemMeta(meta);
        wand = item;
    }

}

 

Well, I don't understand what the init function does. I just followed a tutorial on how to do it.

 

Thanks for the help, it worked!