topic Re: Exceptions and troubles when using time cycles in Alfresco Archive

Exceptions and troubles when using time cycles

billbaroud — Wed, 30 May 2012 15:33:48 GMT

Hi Activiti users I'm trying to use Timer Catching Events with time cycles and I'm getting a lot of exceptions and problems For example, I implemented a very simple example of a workflow displaying on the standard ouput the current time every minute on the 30th second (the corresponding time cyc

Re: Exceptions and troubles when using time cycles

ronald_van_kuij — Wed, 30 May 2012 22:13:45 GMT

The activiti JobExecutor is not meant to be used for realtime or even near real-time executions. The jobExecutor checks for jobs every 5 seconds and each job within that interval is selected, but if something is run, it is also selecting additional jobs that are due within the next period afaik. So it could be a job is 0-5 seconds early or late. And the default number of threads for the jobExecutor is 3, might also have something to do with it…

But what a strange process if I may say so… (or I might miss something). You have a repeated timer, but the script task that is executed afterwards loops back to the same timer…

Re: Exceptions and troubles when using time cycles

billbaroud — Thu, 31 May 2012 06:32:41 GMT

Hi and thanks a lot for the quick answer

So the 5 seconds interval explains the fact that timers are sometimes not perfectly fired on schedule.

However, I still don't get why I am getting so many exceptions and why some jobs are not executed anymore after a while… (in output_no_exceptions.txt, you can see that only 3 of the 4 process instances I started are triggered by the end). Do you have an idea about that ?

As for the process I posted, it is only a very simple subset of the complex workflow I'm using, so it doesn't really makes sens in this form. However, there is no reason for this simple example not to work, is there ?

Thanks a lot for helping