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Re: A question about rule task in jBPM5
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created by <a href="http://community.jboss.org/people/dalgwen">dalgwen</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/616747#616747">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Did you get to manage your issue?</p><p>I got exactly the same stack trace, with the same situation (call to completeWorkItem() from a different thread, and with JPA persistence). Don't know if is of some value, but the code of my WorkItemHandler looks like this :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">@Override
<font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> executeWorkItem(<font color="navy"><b>final</b></font> WorkItem workItem, <font color="navy"><b>final</b></font> WorkItemManager manager) <font color="navy">{</font>
 
 
<font color="navy"><b>new</b></font> Thread(<font color="navy"><b>new</b></font> Runnable() <font color="navy">{</font>
<font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> run() <font color="navy">{</font>
 
<font color="navy"><b>try</b></font> <font color="navy">{</font>
<font color="darkgreen">//some code (...)</font>
manager.completeWorkItem(workItem.getId(), <font color="navy"><b>null</b></font>);
<font color="navy">}</font>
<font color="navy"><b>catch</b></font> (Exception ex) <font color="navy">{</font>
<font color="darkgreen">// some code (...)</font>
<font color="navy">}</font>
<font color="navy">}</font>
<font color="navy">}</font>).start();
 
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Curious fact : this error is triggerered in the second WorkItemHandler of my workflow, despite the fact that the first one use the same kind of code.</p><p>When I debug, i see that :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">PersistenceContext context = ((PersistenceContextManager) env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER )).getCommandScopedPersistenceContext();
context.persist( workItemInfo );
 
((WorkItemImpl) workItem).setId(workItemInfo.getId());
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>"workitemInfo" is ok, but its id is null, so the nullPointerException.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I also debugged with the first WorkItem of my workflow, and then the id is ok after the context.persist(...) call.</p><p>Don't know why it works the first time and not after.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks for reading me.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>(Sorry for my english, it's not my mother langage ;-) !)</p></div>
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<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/616747#616747">going to Community</a></p>
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