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Re: [eclipselink-users] Use of SessionEventListener and SessionCustomizer
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I think the main issue you are having is your call to acquireUnitOfWork(). That
will create a new UnitOfWork -> with no changes.
Try calling postCommitUnitOfWork(). The session attached to your SessionEvent
should be the UnitOfWork.
-Tom
On 19/01/2012 5:10 PM, Dennis Fuglsang wrote:
I am trying to use a SessionEventListener to monitor what has changed in a
transaction (entities persisted, updated, removed) in order to perform
post-transaction processing in my application. The problem I am encountering is
that the UnitOfWorkChangeSet associated with the SessionEvent’s UnitOfWork is
always null. I have tried accessing the UnitOfWorkChangeSet object in a number
of different postXXX methods in my listener implementation but always with the
same null result. An example of the logic is shown below:
public void postCommitTransaction(SessionEvent event) {
UnitOfWork uow = event.getSession().acquireUnitOfWork();
UnitOfWorkChangeSet changeSet = uow.getUnitOfWorkChangeSet();
If (changeSet != null) System.out.println(changeSet);
}
I have tried adding my SessionEventListener directly to the newly created
EntityManager
EntityManager em = entityManagerFactory.createEntityManager(props);
((JpaEntityManager)em.getDelegate()).getSession().getEventManager().addListener(new
MyEventListener());
Or via a SessionCustomizer …
Public void customize(Session session) throws Exception {
Session.getEventManager().addListener(new MyEventListener());
Any help or suggestions would be greatly appreciated.
Dennis
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