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https://issues.apache.org/jira/browse/OPENEJB-976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Blevins reassigned OPENEJB-976:
-------------------------------------
Assignee: Bharath Ganesh
> Semaphore in StatelessInstanceManager not released if
> EjbTransactionUtil.afterInvoke throws RuntimeException
> ------------------------------------------------------------------------------------------------------------
>
> Key: OPENEJB-976
> URL: https://issues.apache.org/jira/browse/OPENEJB-976
> Project: OpenEJB
> Issue Type: Bug
> Components: container system
> Affects Versions: 3.1
> Reporter: Tor-Einar Jarnbjo
> Assignee: Bharath Ganesh
> Fix For: 3.1.1
>
> Attachments: Bean_Pool_Leak_Test_Patch.patch,
> Fix_for_OPENEJB-976-_Bean_Pool_Leak_.patch
>
>
> When invoking an SLSB, a bean instance is retrieved from the
> StatelessInstanceManager in StatelessContainer.invoke
> (instanceManager.getInstance(callContext), line 160). At this point, a
> semaphore is aquired to limit the number of simultaneous calls to a specific
> SLSB type. Later, with a call to poolInstance in line 170, the semaphore is
> supposed to be released. In between, in line 169, the actual bean method is
> invoked within the StatelessContainer._invoke method. Here, in a
> finally-block, EjbTransactionUtil.afterInvoke is called to commit the
> transaction. If txPolicy.commit() (EjbTransactionUtil.java:74) throws a
> RuntimeException, the exception is never caught,
> StatelessInstanceManager.invoke will never reach line 170 and the semaphore
> is not released. After aquiring the semaphore "limit" times (whatever the
> semaphore limit is configured to) and running into problems in the commit
> phase, all further calls to the SLSB will block, because the semaphore cannot
> be aquired anym
ore.
> In our specific case, the DB commit fails because the backing Oracle DB is
> configured to not check for constraint violations until the transaction is
> commited. Eclipselink as JPA provider wraps the SQLException in a
> RuntimeException and causes the described problem:
> Exception [EclipseLink-23011] (Eclipse Persistence Services - 1.0.2 (Build
> 20081024)): org.eclipse.persistence.exceptions.TransactionException
> Exception Description: UnitOfWork [UnitOfWork(
> ...
> at
> org.apache.geronimo.transaction.manager.TransactionManagerImpl.commit(TransactionManagerImpl.java:245)
> at
> org.apache.openejb.core.transaction.JtaTransactionPolicy.completeTransaction(JtaTransactionPolicy.java:291)
> at
> org.apache.openejb.core.transaction.TxRequiresNew.commit(TxRequiresNew.java:68)
> at
> org.apache.openejb.core.transaction.EjbTransactionUtil.afterInvoke(EjbTransactionUtil.java:74)
> at
> org.apache.openejb.core.stateless.StatelessContainer._invoke(StatelessContainer.java:231)
> at
> org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:169)
> ...
> After going over the code, the same problem seem to be the case if the SLSB
> method itself throws a RuntimeException or an Error. In the catch block in
> StatelessContainer, lines 213-228, the RuntimeException/Error is categorized
> as a system exception (ExceptionType.SYSTEM), which causes the SLSB instance
> on purpose not to be put back in the pool. It is of course ok to throw away
> the instance, but the semaphore must be released here as well.
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