Ronald, Thanks for the reply. I'm wrapping my calls to jBPM in a stateless session bean so if I want to pass back any validation exceptions I would need to return the exceptions from the process variables as an array rather than just throwing an exception from the method. Alternatively, I guess I could create a custom exception that contained multiple validation exceptions and throw that from the method. What was your experience of implementing this type of handling? Regards, Paul. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4080031#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...