Using Liferay 6.0.6 and activiti-web-6.0.6.8.war plugin, I used the below method in a JSP page:

WorkflowTaskManagerUtil.assignWorkflowTaskToUser(
companyId,
userId,
workflowTasks.get(i).getWorkflowTaskId(),
assigneeUserId,
"Some note ...",
now,
workflowContext);

I'm able to assign a task to the specified assigneeUserId with success.

BUT if I use the SAME method inside a class that implements MessageListener, I get the below error:

java.lang.NullPointerException
at com.liferay.portal.workflow.WorkflowPermissionAdvice.invoke(WorkflowPermissionAdvice.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy231.assignWorkflowTaskToUser(Unknown Source)
at com.liferay.portal.kernel.workflow.WorkflowTaskManagerUtil.assignWorkflowTaskToUser(WorkflowTaskManagerUtil.java:50)
at o2.base.listener.NewUserDittaListener.assignWFtoGestoreDitta(NewUserDittaListener.java:421)
at o2.base.listener.NewUserDittaListener.doReceive(NewUserDittaListener.java:111)
at o2.base.listener.NewUserDittaListener.receive(NewUserDittaListener.java:60)
at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:63)
at com.liferay.portal.kernel.messaging.ParallelDestination$1.run(ParallelDestination.java:61)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Please, anyone can help me?
Thank you in advance!

Ivano C.

Hi Alexey! Thank you for your fast reply...

In fact I used the same method also in the service layer and it works very well, the same at JSP level.

I reported the problem in Liferay JIRA ...

I think the problem is about the permission checker stuff...

At the begin of the NPE I see:

java.lang.NullPointerException
at com.liferay.portal.workflow.WorkflowPermissionAdvice.invoke(WorkflowPermissionAdvice.java:40)

At line 40 of the above method there is:

40 if (permissionChecker.getUserId() != userId) {
41 throw new PrincipalException();
42 }

Probably the permissionChecker.getUserId() value is null ????

Ciao,
Ivano

Thank you Alexey !

Due the long times I preferred to move the code from Message Listener class to the service layer....

But I hope you can help me about the below my problem:

I'm using Liferay 6.0.6 and your activiti-web-6.0.6.8 plugin .....

In my portlet I created an asset and started the workflow process to approve it.

My actual problem is that I need to assign the process directly to a certain portal's user just after I started the workflow process....

After I call the WorkflowHandlerRegistryUtil.startWorkflowInstance() method, I need to use the WorkflowTaskManagerUtil.assignWorkflowTaskToUser() method to assign the task to this UserId.

The problem is that I'm not able to find the WorkflowTaskId to assign .... and the .startWorkflowInstance() method don't return the Id of the instance just started ....

Please, could you address me how I can find the WorkflowTaskId of the just started process?

Thank you in advance!!!

Ivano C.

Hi Alexey,

I understand that the best option is to do the assigement in the BPM process.

Actually write Java code for me is the faster option... I have to decide to assign the task to a Role or User based on a value in a table. If I need to assign to a specific User I have to read the userId from another table.... so, if I have the Task Id in Java are two method to write only...

Any help is appreciate!!

Thank you Ivano

It is due to permission checker coming out to be null..

I was able to solve it by adding following code before call of the method.



Hope this helps,

Thanks and Regards,
Hitesh Methani.