Error when parsing integer from Minecraft plugin config.yml

Question

I tried adding a path for where the user could input the number of rows in the config file and I had to parse the integer since it's a string and it keeps returning an error. I think it may be an error with the instance reference.

public class GUI {

    private static Main plugin;

    public GUI(Main plugin) {
        this.plugin = plugin;
    }

    public static Inventory inventory;
    public static String inventory_name;
    public static int inventory_rows = Integer.parseInt(plugin.getConfig().getString("numberOfRows")) * 9;

    public static void initialize() {
        inventory_name = Utils.chat("&lTest GUI");

        inventory = Bukkit.createInventory(null, inventory_rows);
    }

    public static Inventory GUI (Player player) {

        Inventory toReturn = Bukkit.createInventory(null, inventory_rows, inventory_name);

        Utils.createItem(inventory, "cobblestone", 1, 1, "&6&lDisplay Name", "&7First lore line", "&7Second lore line.");

        toReturn.setContents(inventory.getContents());
        return toReturn;
    }

    public static void clicked(Player player, int slot, ItemStack clicked, Inventory inventory) {
        if (clicked.getItemMeta().getDisplayName().equalsIgnoreCase(Utils.chat("&6&lDisplay Name"))) {
            player.sendMessage(Utils.chat("&7You have clicked &6&lDisplay Name."));
        }
    }
}

Here is the console log.

[23:38:49] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'gui' in plugin TestPlugin v1.1.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[spigot-api-1.18.1-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-api-1.18.1-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_18_R1.CraftServer.dispatchCommand(CraftServer.java:821) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1939) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1778) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1759) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.network.protocol.game.PacketPlayInChat.a(PacketPlayInChat.java:46) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.network.protocol.game.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.network.protocol.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:30) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.TickTask.run(SourceFile:18) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:151) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.c(SourceFile:23) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1158) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:1) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.util.thread.IAsyncTaskHandler.y(SourceFile:125) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.MinecraftServer.bf(MinecraftServer.java:1137) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.MinecraftServer.y(MinecraftServer.java:1130) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.util.thread.IAsyncTaskHandler.bp(SourceFile:110) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1113) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1038) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:304) ~[spigot-1.18.1-R0.1-SNAPSHOT.jar:3403-Spigot-f4ff00f-2e61a5f]
        at java.lang.Thread.run(Thread.java:833) [?:?]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class io.github.efrank801.gui.GUI
        at io.github.efrank801.commands.GUICommand.onCommand(GUICommand.java:30) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot-api-1.18.1-R0.1-SNAPSHOT.jar:?]
        ... 21 more

score 0 · Answer 1 · answered Jan 20 '22 at 10:14

This is not an error while trying to get value from the config. It seems you have an issue with a dependency which is io.github.efrank801.gui.

To fix it :

If it's a plugin, you should include it in your server, and add it as depend in your plugin.yml file
If it's just a maven/gradle dependency, you should check this question that can help you.

After adding the given dep in your jar or in the server, it will run.

You can learn more about the NoClassDefFoundError

Error when parsing integer from Minecraft plugin config.yml

1 Answers1