To remove the jsf implementation from JBoss 4.0.5, you also need to edit jbossweb-tomcat55.sar\conf\web.xml. Comment out this section: <init-param> <param-name>engineOptionsClass</param-name> <param-value>org.jboss.web.tomcat.tc5.jasper.JspServletOptions</param-value> </init-param> <!-- Specify the jars relative to the jbossweb-tomcat55.sar that should be scanned for common tag lib descriptors to include in every war deployment. --> <init-param> MyFaces tlds <param-name>tagLibJar0</param-name> <param-value>jsf-libs/myfaces-impl.jar</param-value> </init-param> Then you need to package the JSF implementation in your WAR. I don't know why someone would tell you to do this though. ADF projects should run just fine using the built-in MyFaces implementation that comes with JBoss. See http://jsf.jboss.com Stan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042197#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...