Inner Override

It would be logical, consistent, useful, great and simply awesome if one could override inner classes in Java. IUSWIM.

Glassfish School

Error now: 

Exception Description: Mapping annotations cannot be applied to fields or properties that have a @Transient specified. [field playlists] is in violation of this restriction.
at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:221)

So, Glassfish also belongs to the school of providing the minimal amount of 

useful information. "[field playlists]" ok, but WHAT CLASS!?