In my case I get "Exception Processing ErrorPage" when I try to access a jsf page that does not exist such as doe.jsf. According to the following post on one of the mailing lists, having jsf/xhtml to handle error pages is not possible. http://mail-archives.apache.org/mod_mbox/myfaces-users/200606.mbox/%3Cbc3... However, this does not happen with the blog sample application. Also, the error page gets rendered without exceptions when I access a non-jsf page that does not exist such as asdoe.jsp, doe.other and doe.js. What could be the problem? | 16:25:07,854 ERROR [STDERR] Aug 12, 2006 4:25:07 PM com.sun.facelets.FaceletViewHandler handleRenderException | SEVERE: Error Rendering View[/404.xhtml] | java.lang.IllegalStateException: getOutputStream() has already been called for this response | at org.apache.catalina.connector.Response.getWriter(Response.java:599) | at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:195) | at com.sun.facelets.FaceletViewHandler.createResponseWriter(FaceletViewHandler.java:463) | at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:537) | at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:138) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465) | at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) | at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) | at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363) | at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) | at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) | at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) | at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) | at java.lang.Thread.run(Thread.java:595) | 16:25:07,860 ERROR [[Faces Servlet]] Servlet.service() for servlet Faces Servlet threw exception | java.lang.IllegalStateException: getOutputStream() has already been called for this response | at org.apache.catalina.connector.Response.getWriter(Response.java:599) | at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:195) | at com.sun.facelets.FaceletViewHandler.handleRenderException(FaceletViewHandler.java:639) | at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:609) | at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:138) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465) | at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) | at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) | at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363) | at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) | at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) | at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) | at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) | at java.lang.Thread.run(Thread.java:595) | 16:25:07,862 ERROR [[localhost]] Exception Processing ErrorPage[errorCode=404, location=/404.jsf] | javax.servlet.ServletException: getOutputStream() has already been called for this response | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:152) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465) | at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) | at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) | at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:363) | at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:284) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) | at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) | at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) | at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) | at java.lang.Thread.run(Thread.java:595) | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3964781#... 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