One of the reasons I'm using the JSF form validation is that the "required" attribute isn't enforced in the process definition, e.g. : | | <task-node name="MyTaskNode"> | <task name="MyTask" > | <controller> | <variable name="MyVar" access="write,required"></variable> | </controller> | </task> | <transition to="MyNextNode" name="Next Node"></transition> | </task-node> | | | You can open the corresponding form for this node in the jbpm console, omit a value for MyVar, and click Next Node to transition to the next node without any validation error occurring. I looked at the code in TaskController::submitParameters() and it is simply checking for variable's existence in a map, regardless of contents. But this will never fail because an empty variable for MyVar is automatically created by JBPM when it creates the task. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4070301#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...