topic Re: Script Task within a loop causing StackOverflowError in Alfresco Forum

Script Task within a loop causing StackOverflowError

zlatan316 — Mon, 29 Jan 2018 12:43:43 GMT

We have a simple script task in a BPMN that is within a loop that is designed to loop around 500 times. The script task simply creates a string variable. We can see when we don't mark the script as asynchronous, we see a StackOverflowError after around 30 loops occur. If we mark it as asynchronous,

Re: Script Task within a loop causing StackOverflowError

Anonymous — Mon, 29 Jan 2018 13:08:40 GMT

After writing the recursive logic, the stack will be expanded, so StackOverflowError will occur.

How about increasing the thread stack size with JVM parameters?

-Xss:10m

-X Command-line Options

Re: Script Task within a loop causing StackOverflowError

zlatan316 — Mon, 29 Jan 2018 14:53:46 GMT

This is also something but we would need to be able to scale the stack if request and load increases on activiti, which is why I was wondering if there was something specific that only seems to cause it with script tasks in a loop, or indeed if there is an activiti element that can stop it occuring?

Re: Script Task within a loop causing StackOverflowError

Anonymous — Tue, 30 Jan 2018 20:00:46 GMT

Since the Xss option is related to the maximum value, I think the thread size will be expanded as necessary.

If we need to examin why the stack will be expanded, we need to check your script.

Re: Script Task within a loop causing StackOverflowError

zlatan316 — Fri, 02 Feb 2018 12:18:42 GMT

Makes sense. The script was simply creating an integer variable and adding 1 to it, but it is possible it can run thousands of times due it it being in a loop.

Re: Script Task within a loop causing StackOverflowError

Anonymous — Fri, 02 Feb 2018 21:19:26 GMT

Well, please upload the reproduction code (>_<) if you wanto to resolve this problem.