Hi there,
Follow the example described in "jbpm-4.3/doc/devguide/html_single/index.html#timer", the following is what we have done:
(1) in the event listener, we call executeJob:
public void notify(EventListenerExecution execution)
{
String aId = execution.getId();
String aName = execution.getName();
out("===============================");
out("timer handler: (timeout) event (" + aId + ").");
out("===============================");
ProcessInstance processInstance = (ProcessInstance) execution.getProcessInstance();
ManagementService managementService = EnvironmentImpl.getFromCurrent(ManagementService.class);
JobQuery jobQuery = managementService.createJobQuery();
JobQuery timerQuery = jobQuery.timers();
JobQuery ptQuery = timerQuery.processInstanceId( processInstance.getId() );
List<Job> jobList = ptQuery.list();
Job foundJob = null;
for(int ii=0 ; ii < jobList.size(); ii++)
{
Job jbpmJob = jobList.get(ii);
Execution jobExcu = jbpmJob.getExecution();
String bId = jobExcu.getId();
String bName = jobExcu.getName();
if( ! bId.equals(aId) || ! bName.equals(aName) )
continue;
foundJob = jbpmJob;
break;
}
if( foundJob == null )
{
err("cannot find a matched timer object in external db: (execId: " + aId + "), (name: " + aName + ").");
return;
}
out("found a matched timer object in external db: (execId: " + aId + "), (name: " + aName + "), (timerId: " + foundJob.getId() + ").");
managementService.executeJob( foundJob.getId() );
}
(2) in the process definition, we linked it with the timer:
<state g="222,123,147,40" name="generate-file">
<on event="timeout">
<timer duedate="10 seconds"/>
<event-listener class="basicfive.TestTimerHandler">
<field name="msg"><string value="entered the (generate-file) state node."/></field>
</event-listener>
</on>
<on event="start">
<event-listener class="basicfive.TestJobMakeRequestHandler">
<field name="msg"><string value="entered the (generate-file) state node."/></field>
</event-listener>
</on>
<transition g="-71,-15" name="timeout" to="remove-file">
</transition>
</state>
(3) When start the process instance, and after it reaches the handler, it always throws the following exeptions:
10-07-28/17:01:17 DEBUG [basicfive.TestTimerHandler]: (AP) ===============================
10-07-28/17:01:17 DEBUG [basicfive.TestTimerHandler]: (AP) timer handler: (timeout) event (test_Timer_1.680001.generate-file).
10-07-28/17:01:17 DEBUG [basicfive.TestTimerHandler]: (AP) ===============================
10-07-28/17:01:17 DEBUG [basicfive.TestTimerHandler]: (AP) found a matched timer object in external db: (execId: test_Timer_1.680001.generate-file), (name: generate-file), (timerId: 680004).
10-07-28/17:01:17 DEBUG [basicfive.TestTimerHandler]: (AP) leaving event fired for timer object in external db: (id: test_Timer_1.680001.generate-file), (name: generate-file).
### EXCEPTION ###########################################
17:01:17,161 SEV | [ExecuteJobCmd] exception while executing 'timer[680004|2010-07-28 17:01:15,000|timeout]'
java.lang.NullPointerException
at org.jbpm.pvm.internal.model.op.ExecuteEventListener.perform(ExecuteEventListener.java:68)
at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:678)
at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:638)
at org.jbpm.pvm.internal.model.ExecutionImpl.fire(ExecutionImpl.java:585)
at org.jbpm.pvm.internal.model.ExecutionImpl.fire(ExecutionImpl.java:575)
......
How do we resolve this problem ? Thanks a lot for your help in advance.