The error usually meant that there was something wrong with the process xml - but I've never seen it being thrown at runtime. Regarding java activities, there are no limitations for the constructor (as long it is the default constructor). It sure sounds like a strange problem. i'm curious to see what the cause is ;-) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4263930#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...