topic Exception when multi-instance service task itself inside a loop in Alfresco Forum

Exception when multi-instance service task itself inside a loop

yevgenyl — Thu, 02 Aug 2018 13:58:01 GMT

I have the below process. In my process there is a multi-instance service task that itself is a part of a loop.The issue is that I'm getting the below exception after the process is finished.If I'll make Service Task 3 not to be multi-instanced or if Service Task 3 will not be part of the bigger loo

Re: Exception when multi-instance service task itself inside a loop

bassam_al-saror — Fri, 03 Aug 2018 10:43:31 GMT

Can you provide some code that can be use to reproduce the issue?

Re: Exception when multi-instance service task itself inside a loop

yevgenyl — Fri, 03 Aug 2018 10:58:43 GMT

Service Task 2 and Service Task 3 are doing nothing.

Service Task 1 is below.

"index" is just a variable I'm passing when starting the flow.

public class ServiceTask1 implements JavaDelegate
{

@Override
public void execute(DelegateExecution execution) throws Exception
{
int index = execution.getVariable("index" , Integer.class);
List<String> myList = new ArrayList<String>();

if(index > 0)
{
for(int i = 0 ; i<index ; i++)
{
myList.add("test " + i);
}
index--;
execution.setVariable("index", index);
}

execution.setVariable("myList", myList);

}

Re: Exception when multi-instance service task itself inside a loop

yevgenyl — Mon, 06 Aug 2018 09:27:03 GMT

So this is a known issue. if in some point in the process the list, that the multi-instance service task is using, becomes empty - then we'll get this exception.

https://github.com/Activiti/Activiti/issues/748