[Fabric 1.21.1] Crash On Starting Server Due To Incorrectly Attempting To Load Client Only Module On Dedicated Server

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Introduction

Fabric is a popular modding platform for Minecraft, allowing developers to create and share custom content with ease. However, with the release of Fabric 1.21.1, some users have reported encountering a crash on starting their dedicated server due to an incorrectly loaded client-only module. In this article, we will delve into the issue, its causes, and provide a suggested solution to resolve the problem.

The Issue

The issue arises when attempting to load the com.st0x0ef.stellaris.client.renderers.globe.GlobeBlockRenderer class on a dedicated server. This class is intended for client-side rendering and is not compatible with the server environment. As a result, the Fabric loader throws a java.lang.RuntimeException exception, preventing the server from starting.

Suggested Solution

To resolve this issue, you need to annotate the GlobeBlockRenderer class with the @Environment(EnvType.CLIENT) annotation. This will ensure that the class is only loaded on the client-side, preventing the server from attempting to load it.

Additionally, you should only call the GlobeBlockRenderer class through a "main" class that implements the net.fabricmc.api.ClientModInitializer interface. This will ensure that the class is only initialized on the client-side, preventing any conflicts with the server environment.

Snippet from Crash Log

The following snippet from the crash log highlights the issue:

java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'stellaris' at 'com.st0x0ef.stellaris.fabric.StellarisFabric'!
        at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.game.minecraft.Hooks.startServer(Hooks.java:63) ~[fabric-loader-0.16.10.jar:?]
        at knot/net.minecraft.server.Main.main(Main.java:111) [server-intermediary.jar:?]
        at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480) [fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) [fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) [fabric-loader-0.16.10.jar:?]
Caused by: java.lang.RuntimeException: Cannot load class com.st0x0ef.stellaris.client.renderers.globe.GlobeBlockRenderer in environment type SERVER
        at net.fabricmc.loader.impl.transformer.FabricTransformer.transform(FabricTransformer.java:59) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPreMixinClassByteArray(KnotClassDelegate.java:462) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:415) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.16.10.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.16.10.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?]
        at knot/com.st0x0ef.stellaris.common.registry.BlocksRegistry.lambda$static$113(BlocksRegistry.java:174) ~[stellaris-1.21-fabric-1.3.10.jar:?]
        at knot/dev.architectury.registry.registries.fabric.RegistrarManagerImpl$RegistrarImpl.register(RegistrarManagerImpl.java:232) ~[architectury-13.0.8-fabric.jar:?]
        at knot/dev.architectury.registry.registries.DeferredRegister.register(DeferredRegister.java:78) ~[architectury-13.0.8-fabric.jar:?]
        at knot/com.st0x0ef.stellaris.Stellaris.init(Stellaris.java:45) ~[stellaris-1.21-fabric-1.3.10.jar:?]
        at knot/com.st0x0ef.stellaris.fabric.StellarisFabric.onInitialize(StellarisFabric.java:28) ~[stellaris-1.21-fabric-1.3.10.jar:?]
        at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399) ~[fabric-loader-0.16.10.jar:?]
        ... 6 more

Conclusion

In conclusion, the crash on starting the server due to incorrectly attempting to load the client-only module on a dedicated server is a common issue with Fabric 1.21.1. By annotating the GlobeBlockRenderer class with the @Environment(EnvType.CLIENT) annotation and only calling it through a "main" class that implements the net.fabricmc.api.ClientModInitializer interface, you can resolve this issue and ensure a smooth server startup experience.

Troubleshooting Tips

  • Verify that the GlobeBlockRenderer class is annotated with the @Environment(EnvType.CLIENT) annotation.
  • Ensure that the GlobeBlockRenderer class is only called through a "main" class that implements the net.fabricmc.api.ClientModInitializer interface.
  • Check the Fabric loader logs for any errors or warnings related to the GlobeBlockRenderer class.
  • If the issue persists, try updating the Fabric loader to the latest version or seeking help from the Fabric community.

Related Issues

Additional Resources

Introduction

In our previous article, we discussed the issue of Fabric 1.21.1 crashing on starting a dedicated server due to incorrectly attempting to load a client-only module. In this Q&A article, we will address some of the most frequently asked questions related to this issue.

Q: What is the cause of the crash?

A: The crash is caused by the Fabric loader attempting to load a client-only module on a dedicated server. This is because the module is not annotated with the @Environment(EnvType.CLIENT) annotation, which indicates that it should only be loaded on the client-side.

Q: How can I resolve the issue?

A: To resolve the issue, you need to annotate the client-only module with the @Environment(EnvType.CLIENT) annotation. Additionally, you should only call the module through a "main" class that implements the net.fabricmc.api.ClientModInitializer interface.

Q: What is the @Environment(EnvType.CLIENT) annotation?

A: The @Environment(EnvType.CLIENT) annotation is a Fabric annotation that indicates that a class or method should only be loaded on the client-side. This annotation is used to prevent client-only code from being loaded on the server-side, which can cause crashes and other issues.

Q: What is the net.fabricmc.api.ClientModInitializer interface?

A: The net.fabricmc.api.ClientModInitializer interface is a Fabric interface that provides a way to initialize client-side mods. This interface is used to ensure that client-only code is only loaded on the client-side, and not on the server-side.

Q: How do I know if I have a client-only module?

A: If you have a module that is only intended for use on the client-side, it is likely a client-only module. Some common examples of client-only modules include:

  • Renderers
  • GUI components
  • Client-side logic

Q: Can I use a client-only module on the server-side?

A: No, you should not use a client-only module on the server-side. Client-only modules are designed to work on the client-side, and using them on the server-side can cause crashes and other issues.

Q: What are some common mistakes that can cause this issue?

A: Some common mistakes that can cause this issue include:

  • Failing to annotate client-only modules with the @Environment(EnvType.CLIENT) annotation
  • Calling client-only modules through a "main" class that implements the net.fabricmc.api.ModInitializer interface, rather than the net.fabricmc.api.ClientModInitializer interface
  • Using client-only code on the server-side

Q: How can I prevent this issue from occurring in the future?

A: To prevent this issue from occurring in the future, you should:

  • Always annotate client-only modules with the @Environment(EnvType.CLIENT) annotation
  • Only call client-only modules through a "main" class that implements the net.fabricmc.api.ClientModInitializer interface
  • Use client-only code only on the client-side

Conclusion

In conclusion, the issue of Fabric 1.21.1 crashing on starting a dedicated server due to incorrectly attempting to load a client-only module is a common problem that can be resolved by annotating the module with the @Environment(EnvType.CLIENT) annotation and only calling it through a "main" class that implements the net.fabricmc.api.ClientModInitializer interface. By following these best practices, you can prevent this issue from occurring in the future and ensure a smooth server startup experience.