Issues

Optimize PersistentBag.groupByEqualityHash()

NPE on flushing when ElementCollection field contains null element

EntityManager.find() should only check for roll-back-only condition if there is an active JTA transaction, otherwise ORM should throw convert( e, lockOptions )

Have EntityManagerFactory expose persistence.xml `jta-data-source` element as a `javax.persistence.nonJtaDataSource` property

integration overrides during JPA bootstrap ought to override all logically related settings