Instead of casting it to implementation class, you can try something like Execution parentExecution=instance.findActiveExecutionIn("SubProcessParent"); | OpenExecution subProcessExecution=((OpenExecution)parentExecution).getSubProcessInstance(); After that you can access state and signal it with something like: Execution subProcessState=subProcessExecution.findActiveExecutionIn("SubProcess"); Regards Nenad View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4267741#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...