Did you see this: http://wiki.apache.org/myfaces/More_tips_on_Upgrading_to_Tomahawk_1%2e1%2e3
You need the following jar files: myfaces-api-1.1.3.jar myfaces-impl-1.1.3.jar myfaces-shared-core-2.0.2.jar myfaces-shared-impl-2.0.2.jar myfaces-shared-tomahawk-2.0.2.jar tomahawk-1.1.3.jar At least this is what I have and it is working... -----Original Message----- From: Sloan, Noah M [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 28, 2006 11:33 AM To: users@myfaces.apache.org Subject: NoClassDefFoundError: org/apache/myfaces/custom/buffer/HtmlBufferResponseWriterWrapper on server startup. I'm trying to upgrade from MyFaces and Tomahawk 1.1.1 to 1.1.3. I only replaced the myfaces-api, myfaces-impl and tomahawk jars. I also changed the extensions filter class to org.apache.myfaces.webapp.filter.ExtensionsFilter. When Tomcat starts up, I get the following error numerous times: java.lang.NoClassDefFoundError: org/apache/myfaces/custom/buffer/HtmlBufferResponseWriterWrapper at org.apache.myfaces.shared_impl.util.ClassUtils.newInstance(ClassUtils.java:2 79) at org.apache.myfaces.shared_impl.util.ClassUtils.newInstance(ClassUtils.java:2 65) at org.apache.myfaces.config.FacesConfigurator.configureLifecycle(FacesConfigur ator.java:652) at org.apache.myfaces.config.FacesConfigurator.configure(FacesConfigurator.java :144) at org.apache.myfaces.webapp.StartupServletContextListener.initFaces(StartupSer vletContextListener.java:66) at org.apache.myfaces.webapp.StartupServletContextListener.contextInitialized(S tartupServletContextListener.java:49) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java: 3727) ... Am I missing a jar? Any idea where those classes are supposed to come from?