Can't set Mixin compatibilityLevel to 21 like in example-project (1.20.5) | The Fabric Project | Page 1

opaque stump Apr 28, 2024, 1:49 PM

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Hi,
the mixins.json file from the fabric-example-mod:

{
    "required": true,
    "package": "com.example.mixin.client",
    "compatibilityLevel": "JAVA_21",
    "client": [
        "ExampleClientMixin"
    ],
    "injectors": {
        "defaultRequire": 1
    }
}

I downloaded it and testet it. Everything works. However when running the game with my mod and the following mixins.json file, I get an error:
mixins.json:

{
  "required": true,
  "package": "com.my.mod.mixins",
  "compatibilityLevel": "JAVA_21",
  "client": [
    "SomeMixin",
    "OtherMixin"
  ],
  "injectors": {
    "defaultRequire": 1
  }
}

Error:

Uncaught exception in thread "main"
...
Caused by: org.spongepowered.asm.launch.MixinInitialisationError: Mixin config mod.mixins.json specifies compatibility level JAVA_21 which is not recognised
...

When changing the compatibilityLevel to JAVA_17 everything works for some reason. Why? It doesn't seem right to leave the compatibilityLevel to JAVA_17 when my project is in JAVA_21.

vocal nexus Apr 28, 2024, 1:55 PM

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you don't have to touch that, your project will work just fine

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leave it as JAVA_17

opaque stump Apr 28, 2024, 2:07 PM

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Alright, thanks. May I ask why I can leave that at JAVA_17 but everything else has to be Java 21 for Minecraft 1.20.5?

vocal nexus Apr 28, 2024, 2:15 PM

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it's something internal to mixins, i don't have a technical answer but that option might get removed even

opaque stump Apr 28, 2024, 2:18 PM

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Alright. Do I have to close this somewhere or can I just leave this thread as is?

high viper Apr 28, 2024, 2:19 PM

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mine works fine with compatibility level 21

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is the compatibility levels in build.gradle set to 21?

#Can't set Mixin compatibilityLevel to 21 like in example-project (1.20.5)