jbpm - query all unassigned tasks

Question

I'm using jbpm 6.2 and I'm trying to query all tasks that have not been assigned yet. The TaskService doesn't seem to help (or at least I have not found the proper method).

How can it be done?

Answer 1

I did it using the BAMTASKSUMMARY table, not sure if it was the only way to do it.

To do that I first tried the BAMTaskEventListener at the RuntimeManager (so it started recording into the table):

DefaultRegisterableItemsFactory registerableItemsFactory = new DefaultRegisterableItemsFactory();
registerableItemsFactory.addTaskListener(BAMTaskEventListener.class);
emf = Persistence.createEntityManagerFactory("org.jbpm.persistence.jpa");
RuntimeEnvironmentBuilder builder = RuntimeEnvironmentBuilder.Factory.get()
        .newDefaultBuilder().entityManagerFactory(emf).registerableItemsFactory(registerableItemsFactory)
        .knowledgeBase(kbase);

With that code I had a problem, the BAMTaskEventListener didnt have an empty constructor in jbpm 6.2 and there was a problem in the instantiation...I extended it to add an empty constructor and it worked fine:

public class BAMTaskEventListenerExt extends BAMTaskEventListener{

    public BAMTaskEventListenerExt() {
        super(null);
        // TODO Auto-generated constructor stub
    }

    public BAMTaskEventListenerExt(boolean flag) {
        super(flag);
        // TODO Auto-generated constructor stub
    }

    public BAMTaskEventListenerExt(EntityManagerFactory emf) {
        super(emf);
        // TODO Auto-generated constructor stub
    }

}

And then registeded:

DefaultRegisterableItemsFactory registerableItemsFactory = new DefaultRegisterableItemsFactory();
registerableItemsFactory.addTaskListener(BAMTaskEventListenerExt.class);