How can I merge / extend persistence units from different JARs?

Question

I use JPA persistence for my data models with Eclipselink as the persistence provider. I have a modular (OSGi) application and one of the modules contains the standard data

Answer 1

I have a setup where a WAR file contains the persistence.xml file. The solution already described here should be usable for JAR's, WAR's and EAR's. JPA 2.0: Adding entity classes to PersistenceUnit *from different jar* automatically