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<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Re: Persistence and Transaction Management
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created by <a href="http://community.jboss.org/people/marco.rietveld">Marco Rietveld</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/617007#617007">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi Marco, </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks very much for posting all of this! </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Could you maybe clarify <em>why</em> you want to use  application-managed persistence with jBPM? </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>You probably know this, but for clarification: </p><p>RESOURCE_LOCAL means that you want the entityManager (e.g. the persistence layer) to be managed by the application. Application-managed persistence is most often used by servlets, EJB's, and locally running java applications because these are in essence small programs that don't need the extra overhead that container-managed persistence brings with it. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>These programs usually open a persistence context/connection, get the stuff they need, commit the stuff they changed, and clean it all up: there is no usually no need for fine-grained control transactions. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In my opinion, jBPM does need more fine grained control over transactions. It needs this because <em>when</em> objects/data (and which objects/data) are persisted is a more complicated question. JTA gives you this control.  Furthermore, I think there might be cases when you want to commit some objects while leaving other objects in the persistence context (logging objects vs. process context information). </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In short, 1. jBPM needs to be sure that the persistence context is always available, which would be more work for jBPM with application-managed/ (container-managed persistence just works.. :-)) and 2. jBPM needs fine-grained control over transactions, which is easier with JTA. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Does that make any sense? If I'm missing something, please point it out! </p></div>
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