What 'taskService.claim' means?

[hamed]

Hi
could you please explain me the concept of claim i have worked with jbpm 3 for months and i haven't seen something like this!
Regards

[frederikherema1]

setAssignee() and claim() is the same, internally…

When a task is claimed concurrently by 2 threads, one of the calling threads will get an ActivitiOptimisticLockException when calling claim() or setAssignee().