Hello,

I am wondering how/if it is possible to set and access process variables from JPDL.  I am most interested at the moment in being able to assign the return value from an action expression to a process variable for use elsewhere in my process definition.

Here is a snippet from my process definition (not necessarily working) that invokes a Seam service/component and accepts a parameter and returns a String value or null, which I will test against in a transition element, and then use as a parameter in another action expression. Ultimately, the result of the latter service invocation will also be passed as a parameter to another service, although not shown here:


| <process-definition xmlns="http://jbpm.org/jpdl-3.1.xsd"
|      name="interpretationProcess">
|
|
|  <start-state name="start">
|     <transition name="begin" to="determineInterpretationProcess"></transition>
|  </start-state>
|
|   <node name="determineInterpretationProcess">
|     <action expression="#{interpretationLookup.getIntepretationName($recordID)}"/>
|     <transition condition="#{empty interpretationName}" to="completed"/>
|      <transition condition="#{not empty interpretationName}" to="doInterpretation"/>
|   </node>
|
|   <node name="doInterpretation">
|      <action expression="#{interpretationService.doInterpretation($interpretationName)}"/>
|   </node>
|
|   <end-state name="completed" />
|
| </process-definition>
|
There are two issue I have here:

1. $myVar is a process instance variable created when my process instance is created - can it be referenced as shown above in an expression?

2. How would I assign the return value of my expression to a variable with some scope that is accessible within my process? My sense so far is that I may need to use the element...

Note that I would like to avoid having a "stateful" service (in which I invoke a method that does not return a value, but has a separate method for retrieving the result of the method). I have seen this in at least one example, but I would prefer not to do this.

thanks,

Shea.



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