Classpath, classpath, classpath, classpath, classpath. I had some errors like the ones you're seeing once upon a time when I had a resources directory set as both a source path and a module library path in my IDE. Take a stop back and see if you can get one of the base Seam examples deploying under Tomcat ("ant deploy.tomcat" in any Seam directory). If you can, then the problem is almost certainly something subtle in your WEB-INF directory and in your webapp's file layout. Pay special attention to WEB-INF and META-INF, and compare every single freaking file in there to the contents of the .war file from the Seam example. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4026032#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...