java.lang.IllegalArgumentException: Invalid key. Must be [a-z0-9/._-]:

Question

I'm making a plugin but when a start the server it gives this error massage

Error:

[16:43:41] [Server thread/ERROR]: Error occurred while enabling CustomServer v1.0-SNAPSHOT (Is it up to date?)
java.lang.IllegalArgumentException: Invalid key. Must be [a-z0-9/._-]: Custom
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:220) ~[guava-31.1-jre.jar:?]
        at org.bukkit.NamespacedKey.<init>(NamespacedKey.java:84) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.NamespacedKey.minecraft(NamespacedKey.java:175) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at me.entropire.customserver.CustomServer.onEnable(CustomEntropireServer.java:30) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:266) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:342) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:480) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugin(CraftServer.java:540) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugins(CraftServer.java:454) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at org.bukkit.craftbukkit.v1_20_R1.CraftServer.reload(CraftServer.java:962) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at org.bukkit.Bukkit.reload(Bukkit.java:832) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:27) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-api-1.20-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_20_R1.CraftServer.dispatchCommand(CraftServer.java:871) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at org.bukkit.craftbukkit.v1_20_R1.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:50) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:265) ~[spigot-1.20-R0.1-SNAPSHOT.jar:?]
        at net.minecraft.commands.CommandDispatcher.performCommand(CommandDispatcher.java:314) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.commands.CommandDispatcher.a(CommandDispatcher.java:298) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1960) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.network.PlayerConnection.lambda$18(PlayerConnection.java:1922) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.util.thread.IAsyncTaskHandler.b(SourceFile:67) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
        at net.minecraft.server.TickTask.run(SourceFile:18) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.util.thread.IAsyncTaskHandler.d(SourceFile:156) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.d(SourceFile:23) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1152) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:1) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.util.thread.IAsyncTaskHandler.x(SourceFile:130) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.MinecraftServer.bg(MinecraftServer.java:1131) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1124) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:139) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.MinecraftServer.p_(MinecraftServer.java:1108) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1019) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:304) ~[spigot-1.20-R0.1-SNAPSHOT.jar:3797-Spigot-7e2af8b-091027a]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]

Code:

package me.user.customserver;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.inventory.InventoryCloseEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

import java.io.*;
import java.util.Arrays;
import java.util.List;


public class CoinBag implements Listener {
    @EventHandler
    public void OnPlayerInterect(PlayerInteractEvent event) {
        Player player = event.getPlayer();

        if (player.getInventory().getItemInMainHand().getType() == Material.LEATHER_HORSE_ARMOR){
            if (player.getInventory().getItemInMainHand().getItemMeta().getCustomModelData() == 1015) {
                ItemMeta meta = player.getInventory().getItemInMainHand().getItemMeta();
                if (player.getInventory().getItemInMainHand().getItemMeta().hasLore()) {
                    String id = meta.getLore().toString();
                    id = id.replaceAll("C", "");
                    id = id.replaceAll("i", "");
                    id = id.replaceAll("o", "");
                    id = id.replaceAll("n", "");
                    id = id.replaceAll("b", "");
                    id = id.replaceAll("a", "");
                    id = id.replaceAll("g", "");
                    id = id.replaceAll(" ", "");
                    String fileName = id + ".yml";
                        Inventory inv = Bukkit.createInventory(player, 18, "CoinBag " + id);

                        File file = new File("plugins/CustomServer/" + fileName);
                        FileConfiguration config = YamlConfiguration.loadConfiguration(file);

                        if (file.exists()){
                            ItemStack[] contents = ((List<ItemStack>) config.get("CoinBag.contents")).toArray(new ItemStack[0]);
                            inv.setContents(contents);
                        }
                    player.openInventory(inv);

                }
            }
        }
    }

    @EventHandler
    private void onPlayerExitInv(InventoryCloseEvent e) throws IOException {
        if (e.getView().getTitle().contains("CoinBag")){

            String name_inv = e.getView().getTitle();
            name_inv = name_inv.replaceAll("C", "");
            name_inv = name_inv.replaceAll("i", "");
            name_inv = name_inv.replaceAll("o", "");
            name_inv = name_inv.replaceAll("n", "");
            name_inv = name_inv.replaceAll("B", "");
            name_inv = name_inv.replaceAll("a", "");
            name_inv = name_inv.replaceAll("g", "");
            name_inv = name_inv.replaceAll(" ", "");
            ItemStack[] contants = e.getInventory().getContents();

            String fileName = name_inv + ".yml";

            File file = new File("plugins/CustomServer/" + fileName);
            FileConfiguration c = YamlConfiguration.loadConfiguration(file);
            c.set("CoinBag.contents", contants);
            c.save(file);
        }
    }
}

the Error is because of this part of the code:

id = id.replaceAll(" ", "");
name_inv = name_inv.replaceAll(" ", "");

I have tried several ways to change special characters to nothing but the error does not go away. and if i remove this part of code and then the error goas away but my code breaks. can anyone tell me why this Error comes.

You should set it as lower case (the namespace key on your onEnable) — Elikill58, Jun 13 '23 at 17:08
it worked but now the items don't go in the inventory if a file is saved with the same Id — Entropire, Jun 13 '23 at 17:19

score 0 · Answer 1 · answered Jun 13 '23 at 19:17

This error info comes from here (NamespacedKey.java:84).

Preconditions.checkArgument(key != null && isValidKey(key), "Invalid key. Must be [a-z0-9/._-]: %s", key);

And there is a snippet of code that may be the reason.

private static boolean isValidKeyChar(char c) {
    return isValidNamespaceChar(c) || c == '/';
}

Try to confirm your custom OnEnable methods in the custom file "CustomEntropireServer.java" with whether the parameter has '/' or it follows the [a-z0-9/._-] rule.

java.lang.IllegalArgumentException: Invalid key. Must be [a-z0-9/._-]:

1 Answers1