ok I finally got it working with Tomcat 5.5.17 and derby. In addition to the jars listed in this thread, I had copy derby jars to to web-inf\lib and j2ee.jar to <tomcat-home>\shared\lib. Thought of posting it back for those who are struggling to get Jbpm running on tomcat even after following this thread and the blog post http://blogs.sun.com/chengfang/entry/how_to_run_jbpm_on - Meghana View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3990570#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...