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Re: How to make a process instance go on with jBPM5?
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created by <a href="http://community.jboss.org/people/slelarge">Sebastien Lelarge</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/632793#632793">View the full discussion</a>
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<div class="jive-rendered-content"><p>Thank you for your answer Melih. I've tried this yesterday but it caused bad results and Transaction related exceptions when I tried to completeWorkItem from the method where I call the complete command with the TaskCient.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>hopefully, I have just found the reason why my process instances refused to go on after session restore and I will share this below.</p><p>Now things seems to be going well after restarts</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>It is possible that some users are in the same situation.</p><p>In mine, the jBPM engine is embedded in a web application and the Human Task server is started from a dedicated servlet (as suggested by bpmn2user in another post) that launches it as a separate thread.</p><p>On the other side, the jBPM engine is initialized (knowledge base and session creation) at application startup in a ServletContextListener.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>What I didn't realize at this time is that the Human Task server is not yet started when I register the "Human Task" worktitem with the ksession...</p><p>It seems (but I am not sure) that the <strong>register command tries to contact the HT server but logs nothing whatever connection result.</strong></p><p>In the case where the HT server is not available, then the WorkItemHandler cannot wake up the persisted workitems correctly. Particularly, when I tried to complete a task, the Task Server returned a "No listeners found" message telling that it didn't have signals to send back to the workflow engine.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Now that I know that, I have rewritten my HumanTask Server servlet in order to proceed to WorkItem registration after the server is correctly started.</p><p>And things are working without manually completing workItem when completing tasks</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here is a snippet of my start HT server servlet</p><pre class="jive-pre"><code class="jive-code jive-java">logger.info(<font color="red">"Starting jBPM Human Task Server..."</font>);
        taskServerDaemon.startServer(this.port);
        logger.info(<font color="red">"jBPM Human Task Server started."</font>);
       
        <font color="darkgreen">// Get the Knowledge Session initialized at application startup from app context</font>
        <font color="darkgreen">// and register Human Task WorkItem</font>
        logger.info(<font color="red">"Registering Human Task Service for jBPM session."</font>);
        StatefulKnowledgeSession ksession = (StatefulKnowledgeSession)this.getServletContext().getAttribute(ksessionAttribute);
        <font color="navy"><b>if</b></font> (ksession == <font color="navy"><b>null</b></font>) <font color="navy">{</font>
            logger.error(<font color="red">"The retrieved ksession is null. Cannot continue"</font>);
        <font color="navy">}</font> <font color="navy"><b>else</b></font> <font color="navy">{</font>
            CommandBasedWSHumanTaskHandler wsht = <font color="navy"><b>new</b></font> CommandBasedWSHumanTaskHandler(ksession);
           
            <font color="navy"><b>try</b></font> <font color="navy">{</font>
                hostname = InetAddress.getLocalHost().getHostName();
            <font color="navy">}</font> <font color="navy"><b>catch</b></font> (UnknownHostException uhe) <font color="navy">{</font>
                logger.error(<font color="red">"Unable to resolve local host IP"</font>);
            <font color="navy">}</font>
            wsht.setConnection(this.hostname, this.port);
            wsht.connect();
            ksession.getWorkItemManager().registerWorkItemHandler(<font color="red">"Human Task"</font>, wsht);
            logger.info(<font color="red">"Human Task Service for jBPM session "</font> + ksession.getId() + <font color="red">" is registered"</font>);
        <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I hope this can help</p></div>
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<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/632793#632793">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in jBPM at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2034">Community</a></p>
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