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Regarding the explanation of application managed extended persistence context:
An extended persistence context obtained from the application-managed entity manager is a stand-alone persistence context—it is not propagated with the transaction.
but from JPA 2.0 spec:
An application-managed entity manager may be either a JTA entity manager or a resource-local entity
The persistence context is propagated across the entity manager instances as the JTA transaction is
If an entity manager is then invoked from within the component:
- Invocation of an entity manager defined with PersistenceContext-
Type.EXTENDED will result in the use of the existing extended persistence context
bound to that component.
If a component is called and the JTA transaction is propagated into that component:
- if there is a persistence context bound to the JTA transaction, that persistence con-
text is propagated and used
Can we conclude that it will be propagated with the transaction (if the JTA transaction is propagated)?
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No, the propagation that is being talked about here is to different components of a distributed application i.e. to different process spaces (and not about propagating it to a different component within the same process space).
Section 7.7 of the JPA 2.0 spec clearly says, "An extended persistence context obtained from the application-managed entity manager is a stand-alone persistence context—it is not propagated with the transaction."
In a distributed application, the transaction will propagate across process boundaries but not the persistence context.
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