I have done a quick test and the NoClass-Error is fixed in 5.2.9.20 and its running.
In 5.2.8.50 i still get the NoClass-Error like in my old topic https://lucee.daemonite.io/t/runnable-task-java-lang-noclassdeffounderror/526
I also dont get my workaround with the javaSettings running (maybe it was some kind of version-specifc ?!)