topic Re: Paranormal Activiti: Signal Intermediate Events Problem in Alfresco Archive

Paranormal Activiti: Signal Intermediate Events Problem

se040 — Sun, 11 Nov 2012 18:51:28 GMT

Hi,i've been trying to use Signal Intermediate Events in a process but it doesn't work.Its a simple process, where 2 paths are executed paralell and the one path has a catch followed by a script task (simple syso) and the other one a script task followed by a throw signal intermediate event. So basi

Re: Paranormal Activiti: Signal Intermediate Events Problem

jbarrez — Wed, 14 Nov 2012 00:26:41 GMT

The problem you are seeing here is that the Activiti engine handles the parallel gateway sequence flow in the order in which they are defined. As you probably know, Activiti doesn't use real concurrency for this. In this case, the signal catch hasn't been created yet when the throw is done.

An easy 'fix' would be to switch the sequenceflow. ie. first the one with the catch, then the throw. Sorry about that, but that's just the way the engine works. Introducing real concurrency here would create so much more issues (race conditions, deadlocks, etc.) than it would solve.

Re: Paranormal Activiti: Signal Intermediate Events Problem

se040 — Wed, 14 Nov 2012 19:23:08 GMT

Works fine after switching both flows. Thank you!