Hi, i'm using jbpm 3.1.3. Is it possible to throw the ClassNotFoundException in Delegation.java:142 up to the user code? try { clazz = classLoader.loadClass(className); } catch (ClassNotFoundException e) { log.error("couldn't load delegation class '"+className+"'", e); } instead of catching it with a log.error and then running into a NPE. Like this i can't properly display the real reason of the problem. Thanks Marcel View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3984119#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...