I have added this entry to the web.xml: <context-param> | <param-name>org.jboss.jbossfaces.WAR_BUNDLES_JSF_IMPL</param-name> | <param-value>true</param-value> | </context-param> myfaces-api.jar and myfaces-impl.jar I have added to WEB-INF/lib in war file. JBoss AS 4.2.2 is newly installed and the application is newly generated by seam-gen. Without any changes. No other applications on server. Where should I search a solution? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4105262#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...