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Detecting that a process has been started by a call activity task

Question asked by ericsnyder on Jun 7, 2013
Latest reply on Jun 10, 2013 by trademak
I have a process "A" that is calling another process "B" through a call activity. Process "A" sets some variables in process "B" but not all of them. If process "B" is started as a stand alone process then all the info is filled out in the form. If process "B" is started by process "A" then it is missing some information.

I have a gateway right after the start of process "B" that check for a value of a variable that needs to be filled out before continuing. If the variable does not have a value then it is sent to a task to finish filling out process "B" information. The problem is that when I test for a value of the variable (topPrinted) that was not set by process "A" then I get the following error:

<blockcode>Caused by: org.activiti.engine.impl.javax.el.PropertyNotFoundException: Cannot resolve identifier 'topPrinted'
   at org.activiti.engine.impl.juel.AstIdentifier.eval(
   at org.activiti.engine.impl.juel.AstBinary$SimpleOperator.eval(
   at org.activiti.engine.impl.juel.AstBinary.eval(</blockcode>

What is a reliable way to detect if a process is started by a call activity of another process?