I have made a simple jsf1.1 project by use jsf-1_1_01.zip download from sun website, and deployed in JBoss-4.2.0.GA. when it run, a ClassCastException was threw, error message is as follow: 10:18:23,342 ERROR [1]] Exception sending context initialized event to listener instance of class org.jboss.web.jsf.integration.config.JBossJSFConfigureListener java.lang.ClassCastException: com.sun.faces.application.ApplicationAssociate cannot be cast to com.sun.faces.application.ApplicationAssociate at com.sun.faces.application.ApplicationAssociate.getInstance(ApplicationAssociate.java:172) at com.sun.faces.config.JSFVersionTracker.publishInstanceToApplication(JSFVersionTracker.java:266) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:424) at org.jboss.web.jsf.integration.config.JBossJSFConfigureListener.contextInitialized(JBossJSFConfigureListener.java:69) Now i just want to know whether JBoss-4.2.0GA support jSF1.1 or not. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4057575#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...