it is 'a' way, but not all attributes support EL, this one might not (I'm not sure). You can see in the source if it does
It's just a simple string var I outjected (via seam) into the process instance,
I can see the var within 'variableinstance' table of JBPM
(type string, simple string value... etc...)
there must be an easy way to do this,
isn't ContextInstance somehow available within the process itself?
<assignment expression="variable(username)" />