I just checked at your demo and especially the config file. I notice you have no "standard-transaction-interceptor" | <command-service> | <standard-transaction-interceptor /> | ..... | I just removed it from my config file and sucess: "Hello world" is printed ! Thanks a lot again for your help Notices, it would have been easier if a doc explaining all the jBPM config file was available. Cheers. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4245282#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...