I think Tom already pointed out why you get the error you get. It is not LOST is is ENDED (and therefore put in the history) as you can read in the *user* forum in some posts. Besides that: Use the correct forum: http://catb.org/~esr/faqs/smart-questions.html#forum and in this forum read: http://www.jboss.org/index.html?module=bb&op=viewtopic&t=158610 (including my second post) Use sensible headers (== no thread jacking) http://catb.org/~esr/faqs/smart-questions.html#bespecific Don't say it is an issue with jBPM if you do not understand it jBPM fully: http://catb.org/~esr/faqs/smart-questions.html#id306810 This one is obvious http://catb.org/~esr/faqs/smart-questions.html#noprivate Try to interpret the answer: http://catb.org/~esr/faqs/smart-questions.html#lesser please...... Thread CLOSED unless it is about the java activity not using interfaces View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4251662#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...