Problem in call activity with multiple instances

Flowable Engine
1

Hi,
I am using the callActivity in my project and faced the following issue:

When I use callActivity with multiInstanceLoopCharacteristics feature, the binding of expressions do not work properly, but when I use without this feature, everything is correct.

Here is the XML section of my process definition:

<callActivity id="ubi_id-31a1f64a-e42f-4906-b736-cb9c57ab83c8" name="Call Process" calledElement="XYZ">
    <extensionElements>
    <flowable:in sourceExpression="${m}" target="n"/>
     <flowable:out sourceExpression="${n}" target="m"/>
     </extensionElements>
     <multiInstanceLoopCharacteristics isSequential="true" flowable:elementIndexVariable="loopCounter">
     <loopCardinality>1</loopCardinality>
     </multiInstanceLoopCharacteristics>
</callActivity>

I expect that the result of variable “m” is passed to sub-process as variable “n” and after return from execution of sub-process, the variable “n” from sub-process is passed to “m”. But the result of “m” after return from the sub process is “NULL”.
But When I eliminate the “multiInstanceLoopCharacteristics” section and call activity without iteration ans repeat, the result is correct.

Thanks and best regards,
Abbas

2

Which version are you using (there were some changes in this area in latest release)?
You’ve validated that the called process sets the variable n?

3

Hi,
I am using version 6.5.0.
I have validated and I am sure that the called process sets the variable n because I can use it in the callee sub-process, but in return and only in case of putting multiInstanceLoopCharacteristics section, the callee does not return the variable m.

Thanks again,
Abbas

4

Ok - 6.6.0 is released now, so potentially the bug is fixed there. But a small unit test with what you’re seeing would help a lot for us to reproduce the problem you’re seeing.