topic Re: User tasks completed concurrently in different threads in Alfresco Archive

User tasks completed concurrently in different threads

jellybean — Wed, 18 Apr 2012 00:50:42 GMT

I am using Activiti 5.9.I tried running a process with parallel gateway and two user tasks an each path. One of the user tasks is a non-sequential multi-instance. Then I complete each of the user tasks in a separate thread. Occasionally, I am getting the ActivitiOptimisticLockingException when c

Re: User tasks completed concurrently in different threads

ronald_van_kuij — Wed, 18 Apr 2012 05:29:50 GMT

This behaviour can occur, is expected and not a bug. Just complete the second task again and it will succeed. No need to skip using this gateway…

Re: User tasks completed concurrently in different threads

jellybean — Wed, 18 Apr 2012 16:24:24 GMT

Thank you. This really helps.

The solution to retry completing the user tasks make me wonder why can't a similar approach be implemented in Activiti when trying to join (parallel gateway) non-exclusive service tasks running concurrently. I created a similar process where there are 3 async service tasks with "exclusive=false" following a parallel gateway. As expected, I got the Optimistic Locking Exception. Going forward, is Activiti going to build into the engine the retry mechanism at the join of the parallel gateway in a way that it only retry the transition, but not the entire transaction?