JPA - multiple jars defining @Entity objects

Question

We are developing a web application with Spring, Hibernate and Maven in a very modular fashion. There are core projects defining data access and view specific stuff, then th

Answer 1

We use a similar module layout, but we place the persistence context in the war-part of our application and inject the entitymanager into the DAOs of the modules. Except for unit testing, the modules don't have a PU. We did this because we were afraid, that a transaction spanning multiple modules could cause trouble.

In the DAO

@PersistenceContext
private EntityManager em;

In the persistance.xml you need to enlist all entities with the elements.

    com.Entity1      
com.Entity2

etc.