I downloaded the file from here: http://repository.jboss.com/jbpm/jpdl/3.2.2/lib/ I hope this is the right version, but at least it seemed to be newer than my version. But now I'm a bit unclear how to use this library. I included it in my eclipse project, but as I am building with Ant, I don't think that helps. Anyway the jar is in my .esb archive and I also deployed it together with my process through the process designer. Shouldn't this work? Or what else do I have to do? It's still the first transition which is taken no matter which button I click... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4105734#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...