My JRuby client application is very sophisticated and complex. It works with JRuby 9.4.8.0, but updating from that version brings some varied bugs.

trying JRuby 10.0.4.0 I get an error of type Stack trace: DefineModuleInstr.interpret → CachingCallSite.call → CacheEntry.typeOk → NPE "incomingType is null".

My system is Debian Linux testing with Java 21+, and applications uses Swing with AWT Event Dispatch Thread. Perhaps there are some problems with EDT and module and class loading, but I don't see the origin in stack trace, so it is a frustrating situation.

I need some help.