Hi Chris,
Yes I suppose you must have the setup in set-java-home for all the JDK's you wish and then through the console mode you start your server passing the JDK 15\16 as a manual start.
But for me I am facing the same problem (as JDK 1.7) with JDK 1.6 as well, though application works well with JDK 1.5. Still struggling with the root cause, not sure why I am getting the similar issue with JDK 1.6 since it's the default JDK installer with EAS 6.3.1 and must be successfully tested.
Regards,
Kunal