I'm getting this error when deploying a WAR file to my JBoss 4.0.3 RC1 AS:
09:27:04,671 INFO [FacesConfigurator] Reading config /WEB-INF/faces-config-enterprise.xml 09:27:05,250 ERROR [StartupServletContextListener] Error initializing ServletContext java.lang.ClassCastException: org.apache.myfaces.renderkit.html.ext.HtmlButtonRenderer at org.apache.myfaces.config.FacesConfigurator.configureRenderKits(FacesConfigurator.java:595) at org.apache.myfaces.config.FacesConfigurator.configure(FacesConfigurator.java:131) at org.apache.myfaces.webapp.StartupServletContextListener.initFaces(StartupServletContextListener.java:63) at org.apache.myfaces.webapp.StartupServletContextListener.contextInitialized(StartupServletContextListener.java:46) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3669) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4104) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ...