correct, jbpm is single threaded. For complex actionswe advise to use the async functionality, so the processing is done outside the engine and a callback is used to trigger it again. Thatway the chances on deadlocks are a lot less. Never the less, it might be worth looking into writing a text/chapter for this in the docs. Or even looking into reducing the risk View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4017577#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...