I use Eclipse IDE JEE Version: 2020-12 (4.18.0) with Jboss Tools 4.17.
When clicking the "Rebuild Hibernate Console Configuration", the following error is shown:
The message is irritating because both, the system and the project configuration uses the same java compiler version (jdk 12).
The solution is to change the default Eclipse vm-argument in eclipse.ini:
to use the system JDK as described here https://stackoverflow.com/questions/27001200/project-myproject-has-higher-compiler-option-than-running-eclipse.
I think the error message could be more precise or maybe another solution which does not need to change the default vm arguments in eclipse.ini can avoid such errors.