Tim Stephenson [http://community.jboss.org/people/tstephen] created the discussion "jBpm 4.3 service task has no optional args?" To view the discussion, visit: http://community.jboss.org/message/557183#557183 -------------------------------------------------------------- Hi, I've been looking at taskService in a BPMN2 process and I don't seem to be able to define an optional argument. If I define an arg such as:      <jbpm:arg>             <jbpm:object expr="#{cc}" />      </jbpm:arg> but do not have such a variable in the process instance by the time the task is invoked then it fails with the following error: [DefaultCommandService] exception while executing command org.jbpm.pvm.internal.cmd.CompleteTaskCmd@f4189a org.jbpm.pvm.internal.wire.WireException: couldn't invoke method doTest: couldn't create argument 3: script evaluation error: javax.el.PropertyNotFoundException: Cannot find property cc     at org.jbpm.bpmn.flownodes.JavaServiceTaskActivity.perform(JavaServiceTaskActivity.java:94) So it seems all args must exist or am I doing something wrong? I would prefer to handle optional params in my service class. What do you think? thanks in advance, Tim -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/557183#557183] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]