i see that in the gwt-mosaic-0.1.9.jar there is a META-INF/persistence.xml with samplePU in it. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4227068#4227068 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4227068