[jboss-user] [jBPM] - Re: Why is Timer event not triggered in J2EE container?

Gary tse do-not-reply at jboss.com
Mon Aug 8 13:39:17 EDT 2011

Gary tse [http://community.jboss.org/people/garytse] created the discussion

"Re: Why is Timer event not triggered in J2EE container?"

To view the discussion, visit: http://community.jboss.org/message/619951#619951

Thanks for the suggestion, Mare. 

The transaction manager is where I'm having problem with.  

According to this:  http://www.ibm.com/developerworks/websphere/techjournal/0609_alcott/0609_alcott.html http://www.ibm.com/developerworks/websphere/techjournal/0609_alcott/0609_alcott.html
"...to ensure the integrity of transaction context management (and hence the proper management of transactional resources) *WebSphere Application Server does not expose the javax.transaction.TransactionManager interface* to applications or application frameworks deployed into WebSphere Application Server."

As far as I know, both Hibernate and Spring have something of their own to work around this problem, something like :

* *org.hibernate.transaction.WebSphereExtendedJTATransactionLookup*
* *org.springframework.transaction.jta.WebSphereUowTransactionManager*

While I do not know the how Spring and Hibernate work around on TransactionManager, I found a work-around to this problem; and it goes in 2 parts :--

1. WebSphere does not like threads being created in EJB.

The first part of the solution is to fix the threads created directly using J2SE.  The class doing that is : *org.drools.time.impl.JDKTimerService. * Using the example and classes from:  http://www.ibm.com/developerworks/websphere/techjournal/0606_johnson/0606_johnson.html http://www.ibm.com/developerworks/websphere/techjournal/0606_johnson/0606_johnson.html   I was then able to create the thread pool using the WebSphere's WorkerManager.  Now, the threads under this are under J2EE context.

2. Re-initialize the "UserTransaction" 

When the timer service kicks in, it tries to call the single command service class (forgot actual class at the moment).  I perform a JNDI UserTransaction lookup to make it so that the drools transaction manager is new.

I'll try to put a few pieces of code in here later.


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