After three day grope, I found the way to drop integerated JSF RI from jboss 4.2.2: remove jsf-libs from jboss-web.deployer dir and comment following content out jboss-web.deployer\conf\web.xml : <listener> | <listener-class>com.sun.faces.application.WebappLifecycleListener</listener-class> | </listener> <listener> | <listener-class>org.jboss.web.jsf.integration.config.JBossJSFConfigureListener</listener-class> | </listener> <init-param> | <description>JSF standard tlds</description> | <param-name>tagLibJar0</param-name> | <param-value>jsf-libs/jsf-impl.jar</param-value> | </init-param> | <init-param> | <description>JSTL standard tlds</description> | <param-name>tagLibJar1</param-name> | <param-value>jstl.jar</param-value> | </init-param> after droping the integrated JSF RI, web application with Sun's JSF 1.1 RI work. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4106250#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...