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EventListener questions
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reply from <a href="http://community.jboss.org/people/lamj1">Jas Lam</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/533587#533587">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am experiencing this same exact problem where I can not get a handle on the task when my event listener is triggered. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So I dig into jBPM code that handles the <notification/> tag. See section for description of this tag</p><h4><a class="jive-link-anchor-small"><span style="font-size: 10pt; font-weight: normal; ">6.2.6.6. e-mail support in tasks</span></a></h4><p><a class="jive-link-external-small" href="http://docs.jboss.org/jbpm/v4/userguide/html_single/#task">http://docs.jboss.org/jbpm/v4/userguide/html_single/#task</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-xml">
<span class="jive-xml-tag"><task assignee="ssoa" form="tasks/downloadData.htm" g="155,11,123,60" name="DownloadData"></span>
  <span class="jive-xml-tag"><notification/></span>
<span class="jive-xml-tag"></task></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This would trigger the org.jbpm.jpdl.internal.activity.MailListener class to send out an email to the assigned user</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>To find the current task, the MailListener notify method has the following code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">    EnvironmentImpl environment = EnvironmentImpl.getCurrent();
    DbSession dbSession = environment.get(DbSession.class);
    TaskImpl task = dbSession.findTaskByExecution(execution);
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When i stepped through the code in debug mode. the <em>task</em> variable is populated with the newly created task. I also noticed that no entry in the DB has been created for the task yet. Hence using query API won't return any task. It is looking great till this point.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>THEN THE PROBLEM IS:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When i tried to insert the above Java code in implementing my listener. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">TaskImpl task = dbSession.findTaskByExecution(execution);    <font color="darkgreen">//RETURN NULL!!!</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>It always returns NULL. </p><p>As I stepped through debug mode. I noticed my listener code is invoked first before the MailListener notify method. I watched the <em>execution </em>variable and they are the same when in MailListener and myListener. The execution variable already has an associating task. Not sure why dbSession.findTaskByExecution() kept returning NULL.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks in advance for any help!</p></div>
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