Without knowing more about your configuration files I can't help you except saying they might be flawed (surprise ?!) - i.e. the org.jboss.seam.ui.facelet.SeamFaceletViewHandler is configured in my web.xml _not_ in faces-config.xml. If I were you I would use seam-gen (as described at http://docs.jboss.com/seam/1.1GA/reference/en/html/gettingstarted.html). This generates you a _working_ seam application with facelets. From then on you can play with it and transfer the config in your app. Regarding the jars: the el-api & el-ri are in my ear root (I'm not sure if WEB-INF/lib is fine too) and jsf-facelets.jar is in /WEB-INF/lib. Last but not least note that you must _not_ have jars containing the same class in your apps classpath and the servers classpath. Further the configuration is different when you use ajax4jsf - leave that out until you have facelets working. Another idea would be to delete the servers working directories (server/default/log, -tmp, -work). Hope this helps :) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996265#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...