With update of byte-buddy 1.8.0 -> 1.9.2, we intent to make Apache Isis ready for JDK 11+.
We are utilizing byte-buddy for unit-test-support (mockery) and also for creating proxies for domain objects.
It seems the newer version either no longer supports mockery of non public methods or requires some additional setup. Also we do see IllegalAccessExceptions when creating proxies, where byte-buddy 1.8.0 just worked fine.
Problem background and possible solutions can be found here .