No success is greater than 100 different projects needing 100 different JDKs on the same machine. But somehow i don't have a problem building an android app in its own java, while the backing service is done in a completely different jdk. It's not ideal as i would want the latest language features in the android side, but that is an android problem.

My point is that you do not simply update PATH and JAVA_HOME these days. That was Java 1.02 or somesuch roughly a hundred years ago.