By the way…. If I add

<property name="hibernate.ejb.discard_pc_on_close" value="true"/>

to my persistence.xml it seams to solve the problems. At least all our integration tests are green then.

I am just scared a bit on side effects because of the Javadoc:

“Whether or not discard persistent context on entityManager.close() The EJB3 compliant and default choice is false”