FacesContextImpl.setViewRoot is attempting to recreate the viewMap

[pizzi80]

Describe the bug

FacesContextImpl is trying to recreate the ViewScope Map ?

 @Override
  public void setViewRoot(UIViewRoot root) {
      assertNotReleased();
      Util.notNull("root", root);

      if (viewRoot != null && !viewRoot.equals(root)) {
          Map<String, Object> viewMap = viewRoot.getViewMap(false);
          if (viewMap != null) {
              viewRoot.getViewMap().clear();  // <--- !!!! shouldn't it be    viewMap.clear()  ???
          }
          RequestStateManager.clearAttributesOnChangeOfView(this);
      }

      viewRoot = root;
  }

This is the exception I found in the server log:

19:53:44.732 ERROR [FacesExceptionFilter] [0317d6dc-1388-41d3-bc73-863d89969192][a.b.c.d] FacesExceptionFilter: An exception occurred during processing servlet request. Error page '/500.xhtml' will be shown.
java.lang.IllegalStateException: getAttribute: Session already invalidated
	at org.apache.catalina.session.StandardSession.getAttribute(StandardSession.java:1059)
	at org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessionFacade.java:91)
	at org.jboss.weld.module.web.context.beanstore.http.AbstractSessionBeanStore.getAttribute(AbstractSessionBeanStore.java:102)
	at org.jboss.weld.contexts.beanstore.AttributeBeanStore.get(AttributeBeanStore.java:138)
	at org.jboss.weld.module.web.context.beanstore.http.AbstractSessionBeanStore.get(AbstractSessionBeanStore.java:87)
	at org.jboss.weld.contexts.AbstractContext.get(AbstractContext.java:83)
	at org.jboss.weld.contexts.AbstractContext.get(AbstractContext.java:115)
	at org.jboss.weld.contexts.PassivatingContextWrapper$AbstractPassivatingContextWrapper.get(PassivatingContextWrapper.java:78)
	at org.omnifaces.util.BeansLocal.getInstance(BeansLocal.java:134)
	at org.omnifaces.util.BeansLocal.getInstance(BeansLocal.java:121)
	at org.omnifaces.cdi.viewscope.ViewScopeManager.preDestroyView(ViewScopeManager.java:152)
	at org.omnifaces.cdi.viewscope.ViewScopeManager$Proxy$_$$_WeldClientProxy.preDestroyView(Unknown Source)
	at org.omnifaces.cdi.viewscope.ViewScopeEventListener.processEvent(ViewScopeEventListener.java:49)
	at jakarta.faces.event.SystemEvent.processListener(SystemEvent.java:124)
	at jakarta.faces.event.ComponentSystemEvent.processListener(ComponentSystemEvent.java:109)
	at com.sun.faces.application.applicationimpl.Events.processListeners(Events.java:242)
	at com.sun.faces.application.applicationimpl.Events.invokeListenersFor(Events.java:221)
	at com.sun.faces.application.applicationimpl.Events.publishEvent(Events.java:104)
	at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:118)
	at jakarta.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:672)
	at jakarta.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:672)
	at jakarta.faces.component.UIViewRoot$ViewMap.clear(UIViewRoot.java:1838)
	at com.sun.faces.context.FacesContextImpl.setViewRoot(FacesContextImpl.java:419)
	at jakarta.faces.context.FacesContextWrapper.setViewRoot(FacesContextWrapper.java:311)
	at org.omnifaces.exceptionhandler.FullAjaxExceptionHandler.renderErrorPageView(FullAjaxExceptionHandler.java:558)
	at org.omnifaces.exceptionhandler.FullAjaxExceptionHandler.handleAjaxException(FullAjaxExceptionHandler.java:433)
	at org.omnifaces.exceptionhandler.FullAjaxExceptionHandler.handle(FullAjaxExceptionHandler.java:382)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:88)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:159)
	at jakarta.faces.webapp.FacesServlet.executeLifecyle(FacesServlet.java:689)
	at jakarta.faces.webapp.FacesServlet.service(FacesServlet.java:449)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.omnifaces.filter.FacesExceptionFilter.doFilter(FacesExceptionFilter.java:118)
	at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.omnifaces.filter.CacheControlFilter.doFilter(CacheControlFilter.java:239)
	at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.omnifaces.facesviews.FacesViewsForwardingFilter.filterExtensionLessToExtension(FacesViewsForwardingFilter.java:187)
	at org.omnifaces.facesviews.FacesViewsForwardingFilter.filterExtensionLess(FacesViewsForwardingFilter.java:144)
	at org.omnifaces.facesviews.FacesViewsForwardingFilter.filterExtensionLess(FacesViewsForwardingFilter.java:130)
	at org.omnifaces.facesviews.FacesViewsForwardingFilter.doFilter(FacesViewsForwardingFilter.java:86)
	at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:597)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
	at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:431)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896)
	at org.apache.tomcat.util.net.Nio2Endpoint$SocketProcessor.doRun(Nio2Endpoint.java:1683)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.net.AbstractEndpoint.processSocket(AbstractEndpoint.java:1244)
	at org.apache.tomcat.util.net.Nio2Endpoint.setSocketOptions(Nio2Endpoint.java:328)
	at org.apache.tomcat.util.net.Nio2Endpoint$Nio2Acceptor.completed(Nio2Endpoint.java:468)
	at org.apache.tomcat.util.net.Nio2Endpoint$Nio2Acceptor.completed(Nio2Endpoint.java:404)
	at java.base/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:129)
	at java.base/sun.nio.ch.Invoker$2.run(Invoker.java:221)
	at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:113)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
	at java.base/java.lang.Thread.run(Thread.java:1583)

[BalusC]

Agreed, but viewRoot.getViewMap() doesn't recreate map when viewRoot.getViewMap(false) returns non-null. It just returns exactly the same map.

Your issue is caused by something else. After invalidating the session it's wise to immediately send a redirect instead of forwarding to a page which possibly requires a session.

[pizzi80]

viewRoot.getViewMap() actually call viewRoot.getViewMap(true)
which seems to recreate the Map, isn't it?

Your issue is caused by something else. After invalidating the session it's wise to immediately send a redirect instead of forwarding to a page which possibly requires a session.

Yes, probably could be my fault , actually I'm using some async actions during normal ajax action
on a WebApp that I've migrated from Jsf 2.2 + Seam 2.3
where it was safer to use this pattern bacause all the beans were "@Synchronized"

[BalusC]

No, it doesn't recreate. It only creates the map when it's not created yet. Same idea as request.getSession(true). It also doesn't recreate the session when it already exists. The true flag is merely a signal that it should automatically create when it doesn't exist and thus never returns null. The false flag won't autocreate and thus return null when it doesn't exist.