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Container-Manager EntityManager - Automatically joins JTA ?

 
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In application-managed EntityManager, we explicitly call entityManager.joinTransaction().
In container-manager Entitymanager does it automaticalls joins JTA ?
 
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Yes, a container managed EntityManager (i.e. injected, or JNDI looked up) should automatically be JTA managed.

In some servers you may need to set your JPA provider to be integrated with the server in the persistence.xml for this to function.
 
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