Unclaim task

[marcgr]

Hi guys!!
That's my first post . I'm noob on Activiti but I really like it.

So, I'm developing my own explorer and I have a little trouble unclaiming tasks.

That is the way how I claim:

myTask.setAssignee(idUser);
ProcessEngines.getDefaultProcessEngine().getTaskService().claim(myTask.getId(), idUser);‍‍

And trying to unclaim I've found in few posts that says "you just need to do: myTask.setAssignee(null)"…
but is not enough. That don't change anything on my database… I tryed doing:

myTask.setAssignee(null);
ProcessEngines.getDefaultProcessEngine().getTaskService().addCandidateGroup(myTask.getId(), null);‍‍

but it throws an Exception:
org.activiti.engine.ActivitiException: userId and groupId cannot both be null

It seems like doesn't know where to pool it, isn't it?
What I'm doing wrong??

[gant]

Hi,

taskService.setAssignee(task.getId(), null)
works for me.

Regards

[marcgr]

Hi Gant,

thanks but it doesn't work… It throws the exception too.
But maybe is a version problem (I use 5.1)… Anyway next week I'm going to update to 5.6.
I'll try with next version and if it doesn't work I'll post again

[ronald_van_kuij]

in 5.1 this indeed would not work. Unclaiming was implemented in 5.3 iirc. As is posted in this forum and the wiki. Please use some search functionality first next time…

[frankee787]

I know its a bit outdated post, but is there any difference between

taskService.setAssignee(taskId, null);
and

taskService.claim(taskId, null)
Regards,
Franklin

[frederikherema1]

Yes, an already claimed task will throw an exception when claimed by another user, the setAsisgnee always works…`(see javadoc)

/**
   * Claim responsibility for a task: the given user is made assignee for the task.
   * The difference with {@link #setAssignee(String, String)} is that here
   * a check is done if the provided user is known by the identity component.
   * @param taskId task to claim, cannot be null.
   * @param userId user that claims the task. When userId is null the task is unclaimed,
   * assigned to no one.
   * @throws ActivitiException when the user or task doesn't exist or when the task
   * is already claimed by another user.
   */
  void claim(String taskId, String userId);


[frankee787]

The intention is to "Release" or "Unclaim" a task. Also it will be done by the same user alone. Hence what would be the ideal way to do it ?

Regards,
Franklin

[frederikherema1]

The javadoc states:

@param userId user that claims the task. When userId is null the task is unclaimed,
   * assigned to no one.

So use the claim(null) to 'unclaim' instead of the steAsisgnee(null).

[frankee787]

Thanks.

Will Do.

Regards,
Franklin