[hibernate-dev] JTA synchronizations on WildFly
gunnar at hibernate.org
Tue Mar 10 09:03:51 EDT 2015
I'm trying to perform a specific action upon transaction rollback.
Assuming this could be done using a custom
javax.transaction.Synchronization, I tried to register a synchronization as
TransactionImplementor transaction = ...; // e.g. a CMTTransaction
transaction.registerSynchronization( new MySync() );
And indeed beforeCompletion() is invoked as expected. But afterCompletion()
never is. I debugged this a bit on WildFly and observed the following:
* Hibernate ORM registers RegisteredSynchronization with JTA.
RegisteredSynchronization manages (indirectly, through
TransactionCoordinator, SynchronizationRegistry etc.) those
synchronizations added through o.h.t.Transaction.registerSynchronization()
* WildFly (specifically, TransactionUtil ) registers its own
for closing the entity manager/session
Now that second synchronization is called first, closing the session. Upon
SessionImpl#close(), the SynchronizationRegistry is cleared. Then when
afterComplection() is called on RegisteredSynchronization afterwards, any
previously registered delegate synchronizations are gone already and thus
do not get invoked.
I believe I found a workaround for my case by registering my
synchronization through JtaPlatform#registerSynchronization() (which
registers it with the actual JTA transaction).
My questions are:
* Is this behaviour expected?
* Is the work-around of doing the registration via JtaPlatform viable or
are there any drawbacks which I'm not aware of?
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