It is also reproducible by simply running the tests for HV engine on an IBM JDK

Just so that we talk about the same thing, you mean a running a `mvn clean install` on the HV code base in order to compile and test in particular the engine module? When I try to do that I run into all sorts of issues. It starts with the fact that I have to change the enforcer settings, then I have to remove `JavaFXPropertyValueUnwrapper`, since the IBM JDK does not seem to have the JavaFX classes and last but not least there seems to be an issue with the maven-injection-plugin (which I have not looked any deeper in). So I am not sure we talk about the same thing here, since that does not sound simple anymore

I think I will try a different test setup, running just a little demo app with a validation.xml.