Seam and JBPM timers

29. May 2008, 16:45 CET | Link Markus Dahm

Hi,

we are using JBPM in our application and there is a timer-related state:

  <state name="WaitingForReversal">
    <event type="node-enter">
			<action name="sendAnswerMessage" expression="#{jbpmPaymentProcessor.sendAnswerMessage}"></action>
		</event>
		<timer duedate="60 seconds" name="waitingForReversalTimer" transition="bookingCompleted"></timer>
    <transition to="isReversalRequestValid" name="reversalRequest"></transition>
    <transition to="BookingSuccessfullyCompleted" name="bookingCompleted"></transition>
  </state>

However, the transition does not fire automatically. The JBPM job executor/scheduler needs to started.

What is the recommended way to do this with Seam? Can you use Seam/EJB timers and configure it somewhere in components.xml or jbpm.cfg.xml?

I found some other posts about this topic, but none seemed to have a definite answer.

What we are currently doing is to add the Job Executor Servlet to our web.xml:

<servlet>
    <servlet-name>JobExecutorServlet</servlet-name>
    <servlet-class>org.jbpm.job.executor.JobExecutorServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>JobExecutorServlet</servlet-name>
    <url-pattern>/jobs</url-pattern>
  </servlet-mapping>

This works, but produces the following log output:

6:29:41,921 JbpmJobExector:192.168.10.212:1 WARN  [ProxyWarnLog] Narrowing proxy to class org.jbpm.job.Timer - this operation breaks ==
16:29:42,000 JbpmJobExector:192.168.10.212:1 ERROR [JobSession] org.hibernate.TransactionException: could not register synchronization
16:29:42,218 JbpmJobExector:192.168.10.212:1 WARN  [ProxyWarnLog] Narrowing proxy to class org.jbpm.job.Timer - this operation breaks ==
16:29:42,234 JbpmJobExector:192.168.10.212:1 ERROR [JobSession] org.hibernate.TransactionException: could not register synchronization

I guess that it wants to synchronize itself with EJB transaction manager...? So what is the best solution in your opinion?

Thanks in advance Markus