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Re: Why is Timer event not triggered in J2EE container?
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created by <a href="http://community.jboss.org/people/garytse">Gary tse</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/619951#619951">View the full discussion</a>
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<div class="jive-rendered-content"><p>Thanks for the suggestion, Mare. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The transaction manager is where I'm having problem with.  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span>According to this: </span><a class="jive-link-external-small" href="http://www.ibm.com/developerworks/websphere/techjournal/0609_alcott/0609_alcott.html" target="_blank">http://www.ibm.com/developerworks/websphere/techjournal/0609_alcott/0609_alcott.html</a></p><p>"...to ensure the integrity of transaction context management (and hence the proper management of transactional resources) <strong>WebSphere Application Server does not expose the javax.transaction.TransactionManager interface </strong>to applications or application frameworks deployed into WebSphere Application Server."</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>As far as I know, both Hibernate and Spring have something of their own to work around this problem, something like :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><ul><li style="text-align: start;"><strong>org.hibernate.transaction.WebSphereExtendedJTATransactionLookup</strong></li><li style="text-align: start;"><strong>org.springframework.transaction.jta.WebSphereUowTransactionManager</strong></li></ul><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;">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 :--</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;"><span style="text-decoration: underline;">1. WebSphere does not like threads being created in EJB.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;">The first part of the solution is to fix the threads created directly using J2SE.  The class doing that is : <strong>org.drools.time.impl.JDKTimerService.  </strong><span>Using the example and classes from: </span><a class="jive-link-external-small" href="http://www.ibm.com/developerworks/websphere/techjournal/0606_johnson/0606_johnson.html" target="_blank">http://www.ibm.com/developerworks/websphere/techjournal/0606_johnson/0606_johnson.html</a><span>   I was then able to create the thread pool using the WebSphere's WorkerManager.  Now, the threads under this are under J2EE context.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;"><span style="text-decoration: underline;">2. Re-initialize the "UserTransaction"</span> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;">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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;">I'll try to put a few pieces of code in here later.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;">Gary</p></div>
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