Actually they are set on the response, but my point is that some inconsistent view state cached by the browser may be triggering the exception inside MyFaces code, so the CacheControlPhaseListener is worth a try.
Another problem I had was that some users with slow internet were trying to use the page before it was fully loaded, so as the view state hidden field was not rendered yet, a ViewExpiredException was thrown... This behavior was with server state saving. Maybe with client the result can be this NPE from your stackTrace. I solved it with this context parameter: <context-param> <param-name>org.apache.myfaces.RENDER_FORM_VIEW_STATE_AT_BEGIN</param-name> <param-value>true</param-value> </context-param> Another thing is that if you deploy a new version of your application with active sessions, state handling exceptions will happen in the pages that have changed their structure changed somehow. This may look obvious, but I didn't found anything about it on Google. With server state saving I was getting a StringIndexOutOfBoundsException, and with client if I don't remember exactly what was the exception, but it could be the same NPE you are getting. I solved it using Tomcat's parallel deployment. 2014-10-22 10:28 GMT-02:00 Donatas Čiukšys <donatas.ciuk...@mitsoft.lt>: > > don't know why but adding the same headers on my main facelets template > didn't worked > > Cache control headers must be specified on HttpServletRequest object; > > My question is about investigating NPE when they occur in MyFaces code, > not in my code. > > -----Original Message----- > From: Felipe Jaekel [mailto:fkjae...@gmail.com] > Sent: Wednesday, October 22, 2014 2:30 PM > To: MyFaces Discussion > Subject: Re: How to investigate reasons for NullPointer and ViewExpired > exceptions? > > Recently I had a hard time to figure out some NPE with ViewScoped beans. > > In my case some actions on the bean were not fired, so subsequent actions > ended in a NPE because required objects where not initialized. Problem was > happening only in Firefox in case the user pressed F5 after doing some > stuff on the page. > > I suspected off cache handling. Adding a phase listener to add the no cache > headers solved the problem. This is the code I'm using: (don't know why but > adding the same headers on my main facelets template didn't worked) > > /** > * Desativa cache de páginas xhtml > * > * > http://turbomanage.wordpress.com/2006/08/08/disable-browser-caching-in-jsf/ > * > > https://code.google.com/p/omnifaces/source/browse/src/org/omnifaces/filter/CacheControlFilter.java?name=1.7 > * > * @author fjaekel > */ > public class CacheControlPhaseListener implements PhaseListener > { > private static final long serialVersionUID = 1L; > > @Override > public PhaseId getPhaseId() > { > //System.out.println("response " + Formatter.formatDateTimeWithSeconds(new > Date())); > return PhaseId.RENDER_RESPONSE; > } > > @Override > public void afterPhase(PhaseEvent event) > { > } > > @Override > public void beforePhase(PhaseEvent event) > { > FacesContext facesContext = event.getFacesContext(); > > //HttpServletRequest request = (HttpServletRequest) > facesContext.getExternalContext().getRequest(); > //System.out.println(request.getRequestURI()); > > HttpServletResponse response = (HttpServletResponse) > facesContext.getExternalContext().getResponse(); > response.setHeader("Cache-Control", "no-cache,no-store,must-revalidate"); > response.setDateHeader("Expires", 0); > response.setHeader("Pragma", "no-cache"); // Backwards compatibility for > HTTP 1.0. > } > } > > 2014-10-22 8:12 GMT-02:00 Donatas Čiukšys <donatas.ciuk...@mitsoft.lt>: > > > Dear MyFaces experts, > > > > > > > > I’m using TomEE 1.7.1 Plus, MyFaces 2.2.5, PrimeFaces 4.0.21, Omnifaces > > 1.8.1, OCPSoft Rewrite 2.0.12. > > > > State saving: CLIENT; Session timeout: 60minutes; most pages are using > > @ViewScoped beans (javax.faces.view.ViewScoped); Partial state saving is > > not disabled; Encryption and compression are disabled. > > > > > > > > Production system is working in general (4 requests per second), no user > > complaints, but in logs I find these two stack traces (shown at the > bottom) > > constantly (2-3 cases per day). I don’t think that there are any problem > > with MyFaces, but I seek any advice how to collect forensic info on what > > causes the stack traces below. The problems is that I cannot reproduce > > those cases on my dev machine (I try short session timeout, invalidating > > sessions, multiple tabs, …). > > > > > > > > Google says, that using state saving: CLIENT should prevent > > ViewExpiredExceptions. I double-checked, that all my ViewScoped and > > SessionScoped beans are Serializable, and use only Serializable classes. > > Yet still I get ViewExpiredException - No saved view state could be found > > for the view identifier. What could be the reasons? > > > > > > > > I’m already printing for each stack trace all the request info I can > think > > of (as you see in the bottom), where could I dig for additional forensic > > info? Does MyFaces have any tracing facility? > > > > > > > > java.lang.NullPointerException: null > > > > at > > > org.apache.myfaces.application.StateManagerImpl.restoreView(StateManagerImpl.java:147) > > ~[myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > > org.apache.myfaces.shared.view.ViewDeclarationLanguageBase.restoreView(ViewDeclarationLanguageBase.java:104) > > ~[myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > > org.apache.myfaces.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.java:336) > > ~[myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > > javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper...java:82) > > ~[myfaces-api-2.2.5.jar:2.2.5] > > > > at > > > javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper...java:82) > > ~[myfaces-api-2.2.5.jar:2.2.5] > > > > at > > > org.omnifaces.viewhandler.RestorableViewHandler.restoreView(RestorableViewHandler.java:66) > > ~[omnifaces-1.8.1.jar:1.8.1-20140603] > > > > at > > > org.ocpsoft.rewrite.faces.RewriteViewHandler.restoreView(RewriteViewHandler.java:102) > > ~[rewrite-integration-faces-2.0.12.Final.jar:2.0.12.Final] > > > > at > > > org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:168) > > ~[myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > > org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:196) > > [myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > > org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143) > > [myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > javax.faces.webapp.FacesServlet.service(FacesServlet.java:198) > > [myfaces-api-2.2.5.jar:2.2.5] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) > > [tomcat7-websocket.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:205) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338) > > [catalina.jar:7.0.55] > > > > at > > > org.ocpsoft.rewrite.servlet.impl.HttpRewriteResultHandler.handleResult(HttpRewriteResultHandler.java:41) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > org.ocpsoft.rewrite.servlet.RewriteFilter.rewrite(RewriteFilter.java:268) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > > org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:188) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > lt.asseco.tar.setup.jsf.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:30) > > [CharacterEncodingFilter.class:na] > > > > at > > org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:77) > > [omnifaces-1.8.1.jar:1.8.1-20140603] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve...java:220) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve...java:122) > > [catalina.jar:7.0.55] > > > > at > > org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44) > > [tomee-catalina-1.7.1.jar:1.7.1] > > > > at > > > org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) > > [catalina.jar:7.0.55] > > > > at > > org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:188) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > > [na:1.7.0_67] > > > > at > > > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > > [na:1.7.0_67] > > > > at > > > org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread...java:61) > > [tomcat-coyote.jar:7.0.55] > > > > at java.lang.Thread.run(Thread.java:745) > > [na:1.7.0_67] > > > > > > > > ERROR 2014-10-07 11:05:54,879 ##### REQUEST ANALYSIS #####: host: > > 85.206.12.185, method: POST, requestURL: > > > https://www.e-tar.lt/portal/legalAct.html?documentId=6c1b67f0e01411e388bee944977d73d2 > , > > AJAX: false, sessionId: 06A20B649055AC25B4455630ABB84966.asHost2, > > userAgent: Mozilla/5.0 (Windows NT 6.0; rv:32.0) Gecko/20100101 > > Firefox/32.0, contentTypesFromAccept: > > text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 > > > > javax.faces.application.ViewExpiredException: /portal/legalAct.html - No > > saved view state could be found for the view identifier: > > /portal/legalAct.html > > > > at > > > org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:181) > > ~[myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > > org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:196) > > [myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > > org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143) > > [myfaces-impl-2.2.5.jar:2.2.5] > > > > at > > javax.faces.webapp.FacesServlet.service(FacesServlet.java:198) > > [myfaces-api-2.2.5.jar:2.2.5] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) > > [tomcat7-websocket.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:205) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338) > > [catalina.jar:7.0.55] > > > > at > > > org.ocpsoft.rewrite.servlet.impl.HttpRewriteResultHandler.handleResult(HttpRewriteResultHandler.java:41) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > org.ocpsoft.rewrite.servlet.RewriteFilter.rewrite(RewriteFilter.java:268) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > > org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:188) > > [rewrite-servlet-2.0.12.Final.jar:2.0.12.Final] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > lt.asseco.tar.setup.jsf.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:30) > > [CharacterEncodingFilter.class:na] > > > > at > > org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:77) > > [omnifaces-1.8.1.jar:1.8.1-20140603] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve...java:220) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve...java:122) > > [catalina.jar:7.0.55] > > > > at > > org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44) > > [tomee-catalina-1.7.1.jar:1.7.1] > > > > at > > > org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) > > [catalina.jar:7.0.55] > > > > at > > > org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) > > [catalina.jar:7.0.55] > > > > at > > org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:188) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429) > > [tomcat-coyote.jar:7.0.55] > > > > at > > > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > > [na:1.7.0_67] > > > > at > > > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > > [na:1.7.0_67] > > > > at > > > org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread...java:61) > > [tomcat-coyote.jar:7.0.55] > > > > at java.lang.Thread.run(Thread.java:745) > > [na:1.7.0_67] > > > >
