Can't get active session of an eclipselink's EntityManager with spring?

The spring way of doing this is to simply inject the EntityManager with the PersistenceContext annotation and return the delegate...

Your container in this case is Spring and is likely returning null from entityManager.getDelegate(), resulting in an NPE on jpaEntityManager. GetActiveSession(). Try starting a transaction, or getting the EntityManager from an unwrapped EclipseLink EntityManagerFactory directly instead.

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