One issue is that I think Oracle forced package renames and, afaik, there’s no compatibility layer available for packages that expected the old Class Names. To my mind, this sort of defeats the purpose of the JVM’s universally unique symbol names.
I think I’m confusing it with the Java EE changes. However, renaming is only easy to accommodate if you have source access. The JVM’s model is portable binaries, so forcing renames breaks some of that model.
