Fix ClassLoader NoClassDefFoundError

[Xytronix]

Summary

When HyinitClassLoader.tryLoadClass finds class bytes and calls defineClass, it can throw a NoClassDefFoundError if the class's superclass/interfaces can't be resolved. This propagates past PluginClassLoader.loadClass0's catch (ClassNotFoundException), killing the entire fallback chain even when the class exists in the plugin jar.

Related issues

• KamikazeJAM on Discord, courtesy for the fix included

[[2026/02/27 02:38:17 SEVERE]            [MyHtalePlugin|P] Failed to setup plugin com.example.hytale.platform:MyHtalePlugin
java.lang.NoClassDefFoundError: io/lettuce/core/pubsub/RedisPubSubAdapter
        at java.base/java.lang.ClassLoader.defineClass1(Native Method)
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962)
        at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:144)
        at cc.irori.hyinit.mixin.HyinitClassLoader.tryLoadClass(HyinitClassLoader.java:236)
        at cc.irori.hyinit.mixin.HyinitClassLoader.loadClass(HyinitClassLoader.java:158)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490)
        at Hyinit//com.hypixel.hytale.server.core.plugin.PluginClassLoader.loadClass0(PluginClassLoader.java:94)
        at Hyinit//com.hypixel.hytale.server.core.plugin.PluginClassLoader.loadClass(PluginClassLoader.java:79)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490)
...
Caused by: java.lang.ClassNotFoundException: io.lettuce.core.pubsub.RedisPubSubAdapter
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490)
        at cc.irori.hyinit.mixin.HyinitClassLoader.loadClass(HyinitClassLoader.java:166)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490)
        ... 29 more](url)

Type of change

• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change (requires documentation/migration)
• Chore / refactor
• Documentation only

Implementation details

In HyinitClassLoader.tryLoadClass, the defineClass call is now wrapped in a try-catch for NoClassDefFoundError.

Checklist

• Code compiles successfully
• Pull request does not contain unrelated changes
• Changes follow this project's code style (Use spotlessApply when necessary)
• Changes are tested or will be tested after submission