I already asked this on #jbpm but so far I have no idea how to implement this.

I want to retrieve the number of tasks assigned to an owner, _after_ the task data is persisted.

For this purpose I implemented the TaskLifeCycleEventListener interface and the afterTaskAddedEvent method like:

@Override
public void afterTaskAddedEvent(TaskEvent event) {
    PeopleAssignments ppa = event.getTask().getPeopleAssignments();
    if (ppa != null) {
        for (OrganizationalEntity oe : ppa.getPotentialOwners()) {
            Long taskCount = kbManager.getTaskCountByPotentialOwner(oe.getId());
            // do something with taskCount
        }
    }
}

I guess the problem is that I'm executing my query in a new transaction, because the tasks list is always empty . Here is the method I'm calling in from the listener:

public long getTaskCountByPotentialOwner(String owner) {
    Query q = this.em.createNamedQuery("NewTasksAssignedAsPotentialOwner");


    List<Status> newStatus = new ArrayList();
    newStatus.add(Status.Ready);
    newStatus.add(Status.InProgress);
    newStatus.add(Status.Reserved);


    q.setParameter("userId", owner);
    q.setParameter("status", newStatus);
    q.setParameter("groupIds", GROUP_ID);


    Collection<AuditTaskImpl> tasks = q.getResultList();
    if (tasks == null || tasks.size() == 0) {
        return 0;
    }
    return tasks.size();
}

Note that the this.em I'm using here is created from the same EntityManagerFactory which is used to create my RuntimeEnvironment:

RuntimeEnvironment environment = RuntimeEnvironmentBuilder.getDefault()
                                                          .persistence(true)
                                                          .entityManagerFactory(emf)
                                                          .userGroupCallback(this.getUsersAndGroups())
                                                          .knowledgeBase(kbase)
                                                          .registerableItemsFactory(new DefaultRegisterableItemsFactory() {
                                                            @Override
                                                            public List<TaskLifeCycleEventListener> getTaskListeners() {
                                                                List<TaskLifeCycleEventListener> defaultListeners = new ArrayList<>();
                                                                defaultListeners.add(new JPATaskLifeCycleEventListener());
                                                                // add any custom listeners
                                                                defaultListeners.addAll(super.getTaskListeners());
                                                                // add listeners from deployment descriptor
                                                                defaultListeners.addAll(getTaskListenersFromDescriptor());


                                                                defaultListeners.add(new MyTaskLifeCycleEventListener());


                                                                return defaultListeners;
                                                            }
                                                          })
                                                          .get();