I've used trinidad,seam1.2,ajax4jsf,myface in one of my projects. As I test my project on jetty by using mvn jetty:run command, it works well but if i deploy my project (war file) into jboss, it gives me following message: [STDOUT] 2007-07-05 20:39:23,023 ERROR [org.apache.myfaces.webapp.StartupServletContextListener] - <Error initializing ServletContext> java.lang.IllegalArgumentException: Class org.apache.myfaces.trinidadinternal.application.NavigationHandlerImpl is no javax.faces.application.NavigationHandler at org.apache.myfaces.config.FacesConfigurator.getApplicationObject(FacesConfigurator.java:665) at org.apache.myfaces.config.FacesConfigurator.configureApplication(FacesConfigurator.java:587) at org.apache.myfaces.config.FacesConfigurator.configure(FacesConfigurator.java:148) at org.apache.myfaces.webapp.StartupServletContextListener.initFaces(StartupServletContextListener.java:68) at org.apache.myfaces.webapp.StartupServletContextListener.contextInitialized(StartupServletContextListener.java:51) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3854) any idea? Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4060994#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...