Can't start server with my mod that depends on owo, client works fine

Question

Can't start server with my mod that depends on owo, client works fine

Closed this issue 16 days ago · 1 comments

alefnull commented 16 days ago

i just switched over to using owo-lib for a small mod i'm working on for friends, and it's been great so far.

currently my mod works perfectly fine and as expected when run on just a client, but when i try to start a server with my mod, owo, and the fabric api (versions below), i get the RuntimeException shown below. i can only assume i've done something silly because i am still learning Minecraft modding, etc., but i can't figure out what i'm meant to change/fix.

any help would be greatly appreciated.

relevant mod versions:
owo-lib-0.12.24+1.21.9
fabric-api-0.134.0+1.21.9

[17:52:35] [main/INFO]: Initializing QLCraft...
[17:52:35] [main/ERROR]: Failed to start the minecraft server
java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'qlcraft' at 'net.alef.qlcraft.QLCraft'!
        at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$0(FabricLoaderImpl.java:409) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:407) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.game.minecraft.Hooks.startServer(Hooks.java:63) ~[fabric-loader-0.17.3.jar:?]
        at knot/net.minecraft.server.Main.main(Main.java:112) [server-intermediary.jar:?]
        at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:506) [fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) [fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) [fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69) [fabric-loader-0.17.3.jar:?]
        at net.fabricmc.installer.ServerLauncher.main(ServerLauncher.java:69) [fabric-server-mc.1.21.9-loader.0.17.3-launcher.1.1.0.jar:1.1.0]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/class_4068
        at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962) ~[?:?]
        at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:144) ~[?:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:165) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:368) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:231) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.17.3.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ~[?:?]
        at knot/io.wispforest.owo.itemgroup.Icon.of(Icon.java:58) ~[owo-lib-0.12.24+1.21.9.jar:?]
        at knot/net.alef.qlcraft.items.ModItems.<clinit>(ModItems.java:20) ~[qlcraft-0.0.2.jar:?]
        at knot/net.alef.qlcraft.QLCraft.onInitialize(QLCraft.java:34) ~[qlcraft-0.0.2.jar:?]
        at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:405) ~[fabric-loader-0.17.3.jar:?]
        ... 7 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.class_4068
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580) ~[?:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ~[?:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:239) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.17.3.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ~[?:?]
        at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962) ~[?:?]
        at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:144) ~[?:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:165) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:368) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:231) ~[fabric-loader-0.17.3.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.17.3.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ~[?:?]
        at knot/io.wispforest.owo.itemgroup.Icon.of(Icon.java:58) ~[owo-lib-0.12.24+1.21.9.jar:?]
        at knot/net.alef.qlcraft.items.ModItems.<clinit>(ModItems.java:20) ~[qlcraft-0.0.2.jar:?]
        at knot/net.alef.qlcraft.QLCraft.onInitialize(QLCraft.java:34) ~[qlcraft-0.0.2.jar:?]
        at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:405) ~[fabric-loader-0.17.3.jar:?]
        ... 7 more

these appear, to me at least, to be the relevant lines:

...
at knot/io.wispforest.owo.itemgroup.Icon.of(Icon.java:58) ~[owo-lib-0.12.24+1.21.9.jar:?]
at knot/net.alef.qlcraft.items.ModItems.<clinit>(ModItems.java:20) ~[qlcraft-0.0.2.jar:?]
...

and the relevant section from my ModItems.java file:

public class ModItems implements AutoRegistryContainer<Item> {
    public static final Icon GROUP_ICON = Icon.of(id("textures/group_icon.png"), 16, 16, false);

    //* item group for QLCraft items
    //* assign to group by calling ".group(QLCraft.QLCRAFT_GROUP)" on item settings
    //* when registering blocks/items in ModItems/ModBlocks class (if i add blocks)
    public static final OwoItemGroup QLCRAFT_GROUP = OwoItemGroup.builder(
            id("item_group"),
            () -> GROUP_ICON).disableDynamicTitle().build();

    public static final Item RAILGUN = register("railgun", RailgunItem::new, new Item.Settings().maxCount(1).group(QLCRAFT_GROUP));

    ...
    (Rest of ModItems class here)
    ...
}

alefnull · Answer 1 · 2025-10-24T04:05:07.000Z

i managed to solve the issue myself.

turns out i was in fact doing something silly, in that i was creating the item group on the common/main/server side, instead of the client side.

i moved the GROUP_ICON and QLCRAFT_GROUP declarations to the client mod initializer, and registered the item there using the ItemGroupEvents.modifyEntriesEvent() method to add the item to the group.

closing this, and sorry for the bother.

Share to