How to make compatible with CommandPack plugin?

Plugins Plugin Development
1

Hi there!

I’m developing my plugin (here’s the link: GitHub - TonisfelTr/LoreWriter at master). When I start the server separately from CommandPack (Semenkovsky_Ivan / CommandPack), both plugins work fine individually. But if I run the server with both plugins installed simultaneously, it crashes immediately with the following error:

[Server thread/FATAL]: Mixin apply failed commandpack.mixins.forge.json:game.MixinPortalShapeImpl → net.minecraft.world.level.portal.PortalShape: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException @Shadow method createPortalBlocks in commandpack.mixins.forge.json:game.MixinPortalShapeImpl was not located in the target class net.minecraft.world.level.portal.PortalShape. No refMap loaded.

Full error excerpt:

org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: @Shadow method createPortalBlocks in commandpack.mixins.forge.json:game.MixinPortalShapeImpl was not located in the target class net.minecraft.world.level.portal.PortalShape. No refMap loaded.
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attachSpecialMethod(MixinPreProcessorStandard.java:442)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attachShadowMethod(MixinPreProcessorStandard.java:415)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attachMethods(MixinPreProcessorStandard.java:343)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:302)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:280)
at org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1288)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:201)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:398)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:380)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:250)

Versions used:

  • Minecraft: 1.21.4
  • Forge: 54.1.0
  • SpongeForge: 1.21.4-54.0.12-14.0.0-RC2168

What could cause this conflict? Am I doing something incorrectly with my plugin or is there an incompatibility between the two plugins?

2

May want to report it to the commandpack github as im not seeing anything that should block command packs mixins from applying in your code

4

Hello!
This is a Mixin conflict where CommandPack’s Mixin (MixinPortalShapeImpl) can’t find the createPortalBlocks method in PortalShape because a RefMap isn’t loaded when both LoreWriter and CommandPack are running. While each works individually, running them together causes a crash. Ensure both plugins target the same Minecraft version and report this conflict to both plugin developers. As a temporary and risky measure, you could explore Mixin exclusions in your LoreWriter config, but this might break your plugin’s functionality. The developers are best suited to provide a proper fix.