Version 1.2.1 crashes on server startup

[azutake]

Environment

• Version: 1.2.1
• Forge: forge-1.12.2-14.23.5.2859
• crash report: crash-2025-03-20_09.18.47-server.txt

Details

The server starts normally with v1.2.0-hotfix1, but crashes when attempting to start version 1.2.1.

After investigating by building the code myself, I believe the issue may be caused by the build being compiled with Java 21, which is incompatible with this Forge version.

Reason for this hypothesis

The crash report shows:

java.lang.NoClassDefFoundError: com/cleanroommc/groovyscript/IncompatibleJavaException

However, the NoClassDefFoundError occurs before the onConstruction method executes, not during the execution of the handleJavaVersionException method itself.