Unlock Payload Process throwing Null Pointer Exception

[#1]

Hi,

We are upgrading from AEM 6.0 to AEM 6.2 . I see that Unlock Payload Process in the custom workflow is throwing Null Pointer Exception in Dynamic Participant step.

This custom workflow is triggered  by a scheduler  as below  and the session object  passed to create the workflow is obtained from serviceResourceResolver.

Can someone suggest how to resolve this.

  WorkflowSession wfSession = workflowService.getWorkflowSession(session);

        // Get the workflow model

        WorkflowModel wfModel = wfSession.getModel(wfModelDefn);

        if (wfModel != null) {

            // Get the workflow data

            // The first param in the newWorkflowData method is the payloadType.  Just a fancy name to let it know what type of workflow it is working with.

            WorkflowData wfData = wfSession.newWorkflowData("JCR_PATH", absContentPath);

            if (wfData != null) {

                // Run the Workflow.

                wfSession.startWorkflow(wfModel, wfData);

                LOG.debug("Workflow started for for mlc review : {}", absContentPath);

            }

Failure Messagejava.lang.NullPointerException

StepUnlock Payload Process

Failure Stackcom.adobe.granite.workflow.WorkflowException: java.lang.NullPointerException
at com.adobe.granite.workflow.core.advance.ParticipantNodeHandler.doTransition(ParticipantNodeHandler.java:198)
at com.adobe.granite.workflow.core.advance.AdvanceUtil.transitionFrom(AdvanceUtil.java:143)
at com.adobe.granite.workflow.core.WorkflowSessionImpl.completeInternal(WorkflowSessionImpl.java:951)
at com.adobe.granite.workflow.core.job.HandlerBase.complete(HandlerBase.java:507)
at com.adobe.granite.workflow.core.job.JobHandler.process(JobHandler.java:348)
at org.apache.sling.event.impl.jobs.JobConsumerManager$JobConsumerWrapper.process(JobConsumerManager.java:500)
at org.apache.sling.event.impl.jobs.queues.JobQueueImpl.startJob(JobQueueImpl.java:291)
at org.apache.sling.event.impl.jobs.queues.JobQueueImpl.access$100(JobQueueImpl.java:58)
at org.apache.sling.event.impl.jobs.queues.JobQueueImpl$1.run(JobQueueImpl.java:227)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException

[#2]

Dear Priya,

Are you using LockManager[1] to unlock pages. isLocked and unlock methods which are responsible for unlocking.

Please note if LockManger fails you can always remove Lock's via even lower interface Node[1] method removeMixin and setProperty allow to change lock's.

[1] LockManager (Content Repository for Java Technology API Version 2.0)

Regards,

Peter

[#3]

Dear Priya,

Are you using LockManager[1] to unlock pages. isLocked and unlock methods which are responsible for unlocking.

Please note if LockManger fails you can always remove Lock's via even lower interface Node[2] method removeMixin and setProperty allow to change lock's.

[1] LockManager (Content Repository for Java Technology API Version 2.0)​

[2] Node (Content Repository for Java Technology API Version 2.0)

Regards,

Peter

[#4]

Hi,

Could you please try below settings

Workflow lock/ unlock steps not working in AEM 6.3

To apply configurations to allow the Lock/ Unlock processes to function in AEM 6.3, follow these steps:

  Go to http://host:port/system/console/configMgr.

  Find Day CQ Workflow Service.

  Mark Enable Lock/Unlock Process to true.

  Click Save.

  Find Adobe Granite Repository Service User Configuration, and add a new configuration.

  Set Simple Subject Population to true.

  Set Service Users to workflow-process-service.

  Click Save.

Thanks

Arun

[#5]

Issue is fixed.

Root cause for the issue was the participant user was not present in the repository

Error description was misleading , it didn't state like user not found or anything similar.