Execution Query doesn't return assignee info for claimed task

Flowable Engine
1

Hi, I have a requirement where I have to listen to an event like TASK_ASSIGNMENT, get assignee information, and update it in the entity. I’ve been able to accomplish it for a single user, but I’m facing an issue in the case of candidate groups.

To accomplish this, I have implemented FlowableEventListener and I’m listening to TASK_ASSIGNMENT of FlowableEngineEventType. Along with this, I’m using RuntimeService to create ExecutionQuery and get the information related to the currently active task. Below is the code:

WorkflowEventListener.java:

public class WorkflowEventListener implements FlowableEventListener
{

    @Autowired
    private RuntimeService mRuntimeService;

    @Override
    public void onEvent( FlowableEvent event )
    {
        FlowableEngineEventType lEventType = (FlowableEngineEventType) event.getType();

        switch( lEventType )
        {
            case TASK_ASSIGNED:
                if( event instanceof FlowableEntityEventImpl )
                {
                    FlowableEntityEventImpl lFlowableEntityEventImpl = (FlowableEntityEventImpl) event;
                    String lProcessInstanceId = lFlowableEntityEventImpl.getProcessInstanceId();
                    List<Execution> lExecutions = mRuntimeService.createExecutionQuery()
                                                                 .processInstanceId( lProcessInstanceId )
                                                                 .list();
                    UserTask lUserTask = new UserTask();

                    if( lExecutions.size() > 0 )
                    {

                        for( Execution lExecution : lExecutions )
                        {
                            if( ( (ExecutionEntityImpl) lExecution ).getCurrentFlowElement() instanceof UserTask )
                            {
                                lUserTask = (UserTask) ( (ExecutionEntityImpl) lExecution ).getCurrentFlowElement();
                            }
                        }

                        System.out.println( "Assignee info: " + lUserTask.getAssignee() );
                    }
                }

                break;
            default:
                break;
        }
    }

    @Override
    public boolean isFailOnException()
    {
        return false;
    }

    @Override
    public boolean isFireOnTransactionLifecycleEvent()
    {
        return false;
    }

    @Override
    public String getOnTransaction()
    {
        return null;
    }

}

Normally, if I inspect elements in lExecutions , I get information about the assignee of the currently active task. For a basic flow, lExecutions will contain 2 elements, one will be ProcessInstance and other will be ExecutionEntityImpl.
Issue comes when a task is assigned to a group and a user claims the task.
Claiming the task is done via single API call, taskService.claim(). Once I get into the listener and after the claim has happened, I was expecting the assignee info to be populated in currentFlowElement, but assignee remains still null.

image
image756×476 111 KB

I’m not sure why lExecutions is not having assignee information once the task is claimed.
Please let me know if I’m missing any information from my end.

2

I was looking more into the issue and I found that TASK_ASSIGNMENT event is thrown when taskService.claim() call is made. I am able to get the details of active task once claimTask call is finished. I believe the reason assignee info is not updated in Execution, is because claimTask call is still in progress and not finished yet.

3

That’s correct indeed.
If really needed, you can use the ExecutionEntityManager (retrievable through CommandContextUtil) to get the current not-yet flushed version of the execution.

1 Like
4

Thanks, Joram this will be useful. However, for now, I just performed my task once the claiming was done. But