I think this error has always been in this plugin, so I think it should be solved, because OpenJ9 java is an optimized java for minecraft server.

Here are the error screens: (This is me running the server on Java OpenJ9)

i'll be honest with you that this likely will not be fixed. there are some breaking differences between OpenJ9's JVM and hotspot (the standard one) that would be hard to overcome. i would suggest using Eclipse Adoptium/Temurin hotspot JDK 21. they've made great strides since Java 8 when OpenJ9 was born