ClassCastException: org.hibernate.internal.SessionImpl cannot be cast to org.hibernate.ejb.HibernateEntityManager in Hibernate

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP) 7.2
  • Hibernate 5.3

Issue

  • Attempting to unwrap the Hibernate EntityManager instance in order to obtain the encapsulated legacy interface object (the Hibernate Session):

    org.hibernate.Session session = entityManager.unwrap(org.hibernate.ejb.HibernateEntityManager.class).getSession();

  • Encountering an exception:

    java.lang.ClassCastException: org.hibernate.internal.SessionImpl cannot be cast to org.hibernate.ejb.HibernateEntityManager

Resolution

This issue1 is resolved in This content is not included.EAP 7.2 cumulative patch (CP) 1 and later releases. Production systems should use the latest available cumulative patch. However, the entity manager can now be directly unwrapped as a session (the preferred approach):

org.hibernate.Session session = entityManager.unwrap(org.hibernate.Session.class);

Root Cause

This is a known defect (Content from hibernate.atlassian.net is not included.HHH-13281).

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