ClassCircularityError when mods manually call MixinExtrasBootstrap::init

[phantamanta44]

Certain mods—in this case, BBLSOhMy—have a habit of manually calling MixinExtrasBootstrap::init in a core plugin. When this happens while MixinBooter is present, the mixin class transformer will try to transform the MixinExtrasBootstrap class, and since the mixin plugin used by MixinBooter tries to call MixinExtrasBootstrap::init itself, this causes a ClassCircularityError and kills the mixin processor.

A simple setup to reproduce this is a fresh 1.12.2 instance with only the following mods installed:

• MixinBooter 11.13
• BBLSOhMy 1.1.3
• FermiumBooter 1.5.0 (as a required dependency of BBLSOhMy)

An example of the issue with this setup is as follows...

[01:21:27] [main/INFO] [LaunchWrapper]: Loading tweak class name zone.rong.mixinbooter.service.CoremodsRescuer
[01:21:27] [main/DEBUG] [FML]: Instantiating coremod class BBLSOhMyPlugin
[01:21:27] [main/DEBUG] [FML]: The coremod bblsom.BBLSOhMyPlugin requested minecraft version 1.12.2 and minecraft is 1.12.2. It will be loaded.
[01:21:27] [main/WARN] [FML]: The coremod BBLSOhMyPlugin (bblsom.BBLSOhMyPlugin) is not signed!
[01:21:27] [main/DEBUG] [CleanMix]: Preparing config mixin.mixinbooter.init.json
[01:21:27] [main/INFO] [MixinBooter]: Initializing MixinExtras...
[01:21:27] [main/ERROR] [MixinBooter]: Failed to manually load coremod bblsom.BBLSOhMyPlugin from BBLSOhMy-1.1.3.jar.
java.lang.reflect.InvocationTargetException: null
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_442]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_442]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_442]
	at zone.rong.mixinbooter.service.ModDiscoverer.rescueDroppedCoremods(ModDiscoverer.java:198) [-mixinbooter-11.13.jar:?]
	at zone.rong.mixinbooter.service.CoremodsRescuer.<init>(CoremodsRescuer.java:12) [-mixinbooter-11.13.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) [?:1.8.0_442]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [?:1.8.0_442]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) [?:1.8.0_442]
	at java.lang.Class.newInstance(Class.java:442) [?:1.8.0_442]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:115) [NewLaunch.jar:?]
	at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129) [NewLaunch.jar:?]
	at org.prismlauncher.EntryPoint.main(EntryPoint.java:70) [NewLaunch.jar:?]
Caused by: java.lang.NoClassDefFoundError: com/llamalad7/mixinextras/MixinExtrasBootstrap
	at bblsom.BBLSOhMyPlugin.<init>(BBLSOhMyPlugin.java:15) ~[BBLSOhMy-1.1.3.jar:1.1.3]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_442]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_442]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_442]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_442]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	... 16 more
Caused by: java.lang.ClassNotFoundException: com.llamalad7.mixinextras.MixinExtrasBootstrap
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_442]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_442]
	at bblsom.BBLSOhMyPlugin.<init>(BBLSOhMyPlugin.java:15) ~[BBLSOhMy-1.1.3.jar:1.1.3]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_442]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_442]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_442]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_442]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	... 16 more
Caused by: java.lang.ClassCircularityError: com/llamalad7/mixinextras/MixinExtrasBootstrap
	at zone.rong.mixinbooter.MixinBooterMixinPlugin.onLoad(MixinBooterMixinPlugin.java:18) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.PluginHandle.onLoad(PluginHandle.java:119) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinConfig.onSelect(MixinConfig.java:795) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.consumeConfigs(MixinProcessor.java:550) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareNewConfigs(MixinProcessor.java:500) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.lockAndPrepare(MixinProcessor.java:424) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.couldTransformClass(MixinProcessor.java:392) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.couldTransformClass(MixinTransformer.java:266) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:203) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:70) ~[-mixinbooter-11.13.jar:?]
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_442]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_442]
	at bblsom.BBLSOhMyPlugin.<init>(BBLSOhMyPlugin.java:15) ~[BBLSOhMy-1.1.3.jar:1.1.3]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_442]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_442]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_442]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_442]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	... 16 more

In this particular case, the core plugin is loaded by the MixinExtras coremod rescuer service, but this is just incidental; the same issue occurs running an instance with only a test mod that does nothing but call MixinExtrasBootstrap::init in a core plugin:

An example of the issue with this setup is as follows...

[02:04:12] [main/DEBUG] [FML]: Instantiating coremod class TestCorePlugin
[02:04:12] [main/WARN] [FML]: The coremod st.evening.mc.testmod.TestCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[02:04:12] [main/WARN] [FML]: The coremod TestCorePlugin (st.evening.mc.testmod.TestCorePlugin) is not signed!
[02:04:12] [main/DEBUG] [CleanMix]: Preparing config mixin.mixinbooter.init.json
[02:04:12] [main/INFO] [MixinBooter]: Initializing MixinExtras...
[02:04:12] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.RuntimeException: An error occurred trying to configure the Minecraft home at /home/phanta/.local/share/PrismLauncher/instances/1.12.2-test2/minecraft for Forge Mod Loader
	at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:111) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:81) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:42) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:141) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:115) [NewLaunch.jar:?]
	at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129) [NewLaunch.jar:?]
	at org.prismlauncher.EntryPoint.main(EntryPoint.java:70) [NewLaunch.jar:?]
Caused by: java.lang.NoClassDefFoundError: com/llamalad7/mixinextras/MixinExtrasBootstrap
	at st.evening.mc.testmod.TestCorePlugin.<init>(TestCorePlugin.kt:8) ~[testmod-1.12.2-1.0.0.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_442]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_442]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_442]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_442]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:451) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:265) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:107) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	... 8 more
Caused by: java.lang.ClassNotFoundException: com.llamalad7.mixinextras.MixinExtrasBootstrap
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_442]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_442]
	at st.evening.mc.testmod.TestCorePlugin.<init>(TestCorePlugin.kt:8) ~[testmod-1.12.2-1.0.0.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_442]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_442]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_442]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_442]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:451) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:265) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:107) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	... 8 more
Caused by: java.lang.ClassCircularityError: com/llamalad7/mixinextras/MixinExtrasBootstrap
	at zone.rong.mixinbooter.MixinBooterMixinPlugin.onLoad(MixinBooterMixinPlugin.java:18) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.PluginHandle.onLoad(PluginHandle.java:119) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinConfig.onSelect(MixinConfig.java:795) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.consumeConfigs(MixinProcessor.java:550) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareNewConfigs(MixinProcessor.java:500) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.lockAndPrepare(MixinProcessor.java:424) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.couldTransformClass(MixinProcessor.java:392) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.couldTransformClass(MixinTransformer.java:266) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:203) ~[-mixinbooter-11.13.jar:?]
	at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:70) ~[-mixinbooter-11.13.jar:?]
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_442]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_442]
	at st.evening.mc.testmod.TestCorePlugin.<init>(TestCorePlugin.kt:8) ~[testmod-1.12.2-1.0.0.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_442]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_442]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_442]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_442]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_442]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:451) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:265) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:107) ~[forge-1.12.2-14.23.5.2864-universal.jar:?]
	... 8 more

[SliMHaZe]

I think this is just a general incompatibility with fermium... There are some forks that bridge the two I think but I agree that the devs should do it themselves. The stark difference between modern Minecraft modding and 1.12.2 below is compatibility for sure.

[Nischhelm]

this is not an issue with fermium. any mod that tries to be independent of any booter and calls MixinExtrasBootstrap.init() will face issues. fermiumbooter has nothing to do with it. i added mixins to srparasites which wants to stay independent of any libraries and we use mixinextras so we need to init it. and well, that crashes with current mixinbooter, while it doesnt crash without it, or with fermiumbooter or mixinbootstrap or mixincompat or whatever other mixin providing mod.

heres the entire stacktrace, you can get it by just using mixinbooter 11.17 + srp 1.10.9

[13:42:27] [main/INFO] [MixinBooter]: Initializing MixinExtras...
[13:42:27] [main/ERROR] [MixinBooter]: Failed to manually load coremod com.dhanantry.scapeandrunparasites.SRPCoreMod from SRParasites-1.10.9.jar.
java.lang.reflect.InvocationTargetException: null
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_472]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_472]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_472]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_472]
	at zone.rong.mixinbooter.service.ModDiscoverer.rescueDroppedCoremods(ModDiscoverer.java:201) [!mixinbooter-11.17.jar:?]
	at zone.rong.mixinbooter.service.CoremodsRescuer.<init>(CoremodsRescuer.java:12) [!mixinbooter-11.17.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_472]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) [?:1.8.0_472]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [?:1.8.0_472]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) [?:1.8.0_472]
	at java.lang.Class.newInstance(Class.java:442) [?:1.8.0_472]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: com/llamalad7/mixinextras/MixinExtrasBootstrap
	at com.dhanantry.scapeandrunparasites.SRPCoreMod.<init>(SRPCoreMod.java:15) ~[SRParasites-1.10.9.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_472]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_472]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_472]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_472]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_472]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864.jar:?]
	... 13 more
Caused by: java.lang.ClassNotFoundException: com.llamalad7.mixinextras.MixinExtrasBootstrap
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_472]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_472]
	at com.dhanantry.scapeandrunparasites.SRPCoreMod.<init>(SRPCoreMod.java:15) ~[SRParasites-1.10.9.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_472]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_472]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_472]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_472]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_472]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864.jar:?]
	... 13 more
Caused by: java.lang.ClassCircularityError: com/llamalad7/mixinextras/MixinExtrasBootstrap
	at zone.rong.mixinbooter.MixinBooterMixinPlugin.onLoad(MixinBooterMixinPlugin.java:18) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.PluginHandle.onLoad(PluginHandle.java:119) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinConfig.onSelect(MixinConfig.java:795) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.consumeConfigs(MixinProcessor.java:550) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareNewConfigs(MixinProcessor.java:500) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.lockAndPrepare(MixinProcessor.java:424) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.couldTransformClass(MixinProcessor.java:392) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.couldTransformClass(MixinTransformer.java:266) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:203) ~[!mixinbooter-11.17.jar:?]
	at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:70) ~[!mixinbooter-11.17.jar:?]
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_472]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_472]
	at com.dhanantry.scapeandrunparasites.SRPCoreMod.<init>(SRPCoreMod.java:15) ~[SRParasites-1.10.9.jar:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_472]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_472]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_472]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_472]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_472]
	at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:594) ~[forge-1.12.2-14.23.5.2864.jar:?]
	... 13 more

EDIT: i want to add that it might be more sensible to PR/issue to upstream mixinextras instead of branching off. mixinextras is updated regularly (last commit 2 weeks ago), unlike mixin.

[Nischhelm]

mods can avoid this right now using reflection like this

try {
	//MixinExtrasBootstrap.init();
	Class.forName("com.llamalad7.mixinextras.MixinExtrasBootstrap").getMethod("init").invoke(null);
} catch (Throwable ignored) {
	LOGGER.warn("Failed to init MixinExtras. This is likely due to MixinBooter initialising a different version of MixinExtras and can be ignored.");
}

or just not calling MixinExtrasBootstrap in the first place if they depend on either booter.

but ofc it would be nice if not every mod using mixinextras would have to update.