Hi I had the same problem while using seam 1.2.1 GA with Tomcat 5.5 and did not want to use persistence in the app. Now I downloaded Seam 2.0.0 and ran it on Tomcat 6. The app works if I don't include persistence.xml file but I am still not able to remove the persistence related libraries in order to make the deployment on tomcat small and fast. Basically I don't know which libraries to not include which persistence related from seam_home/lib dir. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4121691#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...