Server fails to start when FreedomChat is installed

[n1ckoates]

Describe the bug
When starting a server with ServerCore and FreedomChat installed, it immediately stops with this error:

[10:07:10] [main/ERROR]: Uncaught exception in thread "main"
java.lang.RuntimeException: An exception occurred when launching the server!
        at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:71) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.installer.ServerLauncher.main(ServerLauncher.java:69) ~[fabric-server-mc.1.21.3-loader.0.16.9-launcher.1.0.1.jar:1.0.1]
Caused by: java.lang.RuntimeException: Mixin transformation of net.minecraft.server.Main failed
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.16.9.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:473) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69) ~[fabric-loader-0.16.9.jar:?]
        ... 1 more
Caused by: java.lang.NoSuchMethodError: 'void org.yaml.snakeyaml.DumperOptions.setProcessComments(boolean)'
        at knot/me.wesley1808.servercore.common.config.ConfigManager.lambda$create$0(ConfigManager.java:43) ~[servercore-fabric-1.5.8+1.21.3.jar:?]
        at knot/space.arim.dazzleconf.ext.snakeyaml.SnakeYamlConfigurationFactory.loadMapFromReader(SnakeYamlConfigurationFactory.java:131) ~[space_arim_dazzleconf_dazzleconfml-1.3.0-M2-be20db82564942fd.jar:?]
        at knot/space.arim.dazzleconf.factory.AbstractConfigurationFactory$ConfigFactoryDelegate.loadMap(AbstractConfigurationFactory.java:148) ~[space_arim_dazzleconf_dazzleconfre-1.3.0-M2-ef80c55a5f97069b.jar:?]
        at knot/space.arim.dazzleconf.factory.HumanReadableConfigurationFactory.bufferedLoadMap(HumanReadableConfigurationFactory.java:90) ~[space_arim_dazzleconf_dazzleconfre-1.3.0-M2-ef80c55a5f97069b.jar:?]
        at knot/space.arim.dazzleconf.factory.HumanReadableConfigurationFactory.loadMap(HumanReadableConfigurationFactory.java:78) ~[space_arim_dazzleconf_dazzleconfre-1.3.0-M2-ef80c55a5f97069b.jar:?]
        at knot/space.arim.dazzleconf.factory.ConfigurationFormatFactory.load(ConfigurationFormatFactory.java:126) ~[space_arim_dazzleconf_dazzleconfre-1.3.0-M2-ef80c55a5f97069b.jar:?]
        at knot/space.arim.dazzleconf.factory.DelegatingConfigurationFactory.load(DelegatingConfigurationFactory.java:57) ~[space_arim_dazzleconf_dazzleconfre-1.3.0-M2-ef80c55a5f97069b.jar:?]
        at knot/space.arim.dazzleconf.factory.AbstractConfigurationFactory.load(AbstractConfigurationFactory.java:42) ~[space_arim_dazzleconf_dazzleconfre-1.3.0-M2-ef80c55a5f97069b.jar:?]
        at knot/me.wesley1808.servercore.common.config.ConfigManager.reloadConfigData(ConfigManager.java:106) ~[servercore-fabric-1.5.8+1.21.3.jar:?]
        at knot/me.wesley1808.servercore.common.config.ConfigManager.reload(ConfigManager.java:67) ~[servercore-fabric-1.5.8+1.21.3.jar:?]
        at knot/me.wesley1808.servercore.common.config.Config.loadOptimizationConfig(Config.java:25) ~[servercore-fabric-1.5.8+1.21.3.jar:?]
        at knot/me.wesley1808.servercore.mixin.ServerCoreMixinPlugin.onLoad(ServerCoreMixinPlugin.java:18) ~[servercore-fabric-1.5.8+1.21.3.jar:?]
        at org.spongepowered.asm.mixin.transformer.PluginHandle.onLoad(PluginHandle.java:119) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at org.spongepowered.asm.mixin.transformer.MixinConfig.onSelect(MixinConfig.java:790) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.selectConfigs(MixinProcessor.java:498) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:460) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:438) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:290) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202) ~[sponge-mixin-0.15.4+mixin.0.8.7.jar:0.15.4+mixin.0.8.7]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.16.9.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:473) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) ~[fabric-loader-0.16.9.jar:?]
        at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69) ~[fabric-loader-0.16.9.jar:?]

Reproduce
Steps to reproduce the behavior:

• Install ServerCore, FreedomChat, and Fabric API on a Fabric server.
• Attempt to launch the server.

Expected behavior
The server starts normally, as happens when either mod is installed independently.

Versions -Latest is not a version!
ServerCore: 1.5.8
Minecraft: 1.21.3

Mod incompatibilities

• FreedomChat

[Wesley1808]

Servercore includes version 2.2 of the snakeyaml library in the jar file through Jar-in-Jar. It looks like FreedomChat is shading the configurate-yaml library, which includes an old version of snakeyaml (I believe v1.28) - but FreedomChat doesn't relocate these.

Because it isn't relocating the shaded library its overriding servercore's, meaning its trying to use an old version that doesn't have all the features that servercore depends on. You should probably report this to FreedomChat aswell.

[pop4959]

Fixed in FreedomChat - was definitely an oversight, but this should probably be addressed here because it looks like ServerCore is not relocating these libraries either. This will conflict again with any other mod using snakeyaml (which isn't unlikely).

[Wesley1808]

I always thought that wasn't nearly as much of a problem with JiJ libraries as it is with using shadow. Thanks for resolving the compatibility issue, I'll take another look at it.

[pop4959]

Yeah I'm generally not familiar with JiJ as this is not really used outside of Fabric, so I wasn't even aware that this was a possibility either to be quite honest.