topic Exception while invoking TaskListener: null in Alfresco Forum

Exception while invoking TaskListener: null

praveenshanmuga — Mon, 17 Apr 2017 15:13:35 GMT

I implement the TaskListener, i gotr the exception while task being created.code arelong workflowTaskId=0l; long compId=0l; @Override public void notify(DelegateTask arg0) { // TODO Auto-generated method stub workflowTaskId=Long.parseLong(arg0.getId()); compId=Long.parseLong(arg0.getTenantId()); Sys

Re: Exception while invoking TaskListener: null

gdharley — Mon, 17 Apr 2017 16:16:49 GMT

What event do you have the tasklistener registered against?

If it is the assign event, you may not have a fully populated task which could lead to such an NPE.

Cheers,

Greg

‌

Re: Exception while invoking TaskListener: null

praveenshanmuga — Tue, 18 Apr 2017 04:07:08 GMT

event : create

the Bpmn's xml code

<userTask id="usertask1" name="Update Due Date" activiti:candidateGroups="Administrator,Power User">
<extensionElements>
<activiti:taskListener event="create" class="com.library.model.listeners.MyTaskCreateListener" />
</extensionElements>
</userTask>

Re: Exception while invoking TaskListener: null

gdharley — Tue, 18 Apr 2017 14:52:11 GMT

Ok, so it isnt the partially populated task object that is the problem.

Perhaps you have no tenant associated. Can you tell us what line the NPE is coming from (i.e. stack trace)?

Thanks,
Greg

‌

Re: Exception while invoking TaskListener: null

praveenshanmuga — Wed, 19 Apr 2017 04:39:41 GMT

String classPk= WorkflowTaskManagerUtil.getWorkflowTask(compId, workflowTaskId).getOptionalAttributes().get("entryClassPK").toString();

The above mentioned line make NPE, and give warning is cannot find taskId

Re: Exception while invoking TaskListener: null

gdharley — Wed, 19 Apr 2017 16:58:38 GMT

Ok, so I see now why you wont attach a stack trace.
It appears as though you are using the Liferay-Activiti connector and the error is coming out of the Liferay code.

Can you confirm the workflowTaskId is populated with a valid id?

Thx,

Greg

‌

Re: Exception while invoking TaskListener: null

praveenshanmuga — Thu, 20 Apr 2017 06:53:32 GMT

The populated workflowTaskId is a valid id, its confirmed

Re: Exception while invoking TaskListener: null

gdharley — Thu, 20 Apr 2017 11:35:13 GMT

If that's the case then the issue lies within the Liferay library.

Not sure I can hlp with that have never used the plugin, perhaps someone else on teh forum has worked with the Liferay module.

Greg

‌