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<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Multiple Threads on a Stateful Session
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created by <a href="https://community.jboss.org/people/r3vans">Richard Evans</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/744840#744840">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am trying to get an multi-threaded application to run against a single kSession.</p><p>I have made every serviceTask asynchronous but I CANNOT eliminate problems that I think are related to persistence context.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="text-decoration: underline;">Each Handler lools like this:</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>   executeWorkItem(WorkItem workItem, WorkItemManager manager ) {</p><p>       WorkHandlerRunner task = new WorkHanderRunner ( kSession, workItem, this)</p><p>       threadPoolTaskExecutor.execute ( task )</p><p>   }</p><p>  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="text-decoration: underline;">WorkHandlerRunner run looks like this</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  Constructor saves kSesssion, workItem and workItemHandler</p><p>  </p><p>   run() {</p><p>       WorkItemManager manager = kSession.getWorkItemManager()</p><p>       results = runInTransaction ( manager ) </p><p>       manager.completeWorkItem ( workItem.getId(), results)</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>   @Transactional </p><p>    Map<String, Object> runInTransaction ( WorkItemManager manager) {</p><p>            // the doExecute does the business work and does not call into kbpm code</p><p>            return handler.doExecuteWorkItem (workItem, manager)</p><p>     }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When run it sometimes works for a while but eventually falls over with a mixture of exceptions like</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>- JPAWorkItemManager.internalWorkItem ( JPAWorkItemManager.java 43 )  - NPA</p><p>- ProcessInstanceImp.getProcess ( kruntime null )</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am trying to get a better handle on what happens and when but wonder whether at this light level of reporting someone can spot the obvious mistake. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Cheers,</p><p>Richard</p></div>
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<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/744840#744840">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in jBPM at <a href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2034">Community</a></p>
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