在使用primefaces和omnifaces开发的JSF Web应用程序中，当会话超时时，RESTORE_VIEW阶段会发生以下错误。
ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host]. (ajp-executor-threads - 1694) FullAjaxExceptionHandler: An exception occurred during processing JSF ajax request. Error page '/pages/standardErrorPage.xhtml' will be shown.: javax.faces.application.ViewExpiredException: viewId:/pages/myPage.jsf - View /pages/myPage.jsf could not be restored.
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:205) [jsf-impl-2.1.23-jbossorg-1.jar:]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.23-jbossorg-1.jar:]
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116) [jsf-impl-2.1.23-jbossorg-1.jar:]
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.23-jbossorg-1.jar:]
at org.apache.myfaces.extensions.cdi.jsf2.impl.listener.phase.CodiLifecycleWrapper.execute(CodiLifecycleWrapper.java:95) [myfaces-extcdi-jsf20-module-impl-1.0.5.jar:1.0.5]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.1.23.Final.jar:2.1.23.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79) [primefaces-3.5.7.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.omnifaces.filter.FacesExceptionFilter.doFilter(FacesExceptionFilter.java:56) [omnifaces-1.5.jar:1.5]
at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:75) [omnifaces-1.5.jar:1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.omnifaces.filter.GzipResponseFilter.doFilter(GzipResponseFilter.java:148) [omnifaces-1.5.jar:1.5]
at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:75) [omnifaces-1.5.jar:1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.omnifaces.facesviews.FacesViewsForwardingFilter.doFilter(FacesViewsForwardingFilter.java:180) [omnifaces-1.5.jar:1.5]
at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:75) [omnifaces-1.5.jar:1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:488) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:508) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)
at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:806)
at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)
at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:847)
at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_38]
at org.jboss.threads.JBossThread.run(JBossThread.java:122)
ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host]] (ajp-executor-threads - 1694) JBWEB000313: Exception processing error page /pages/standardErrorPage.xhtml: java.lang.IllegalStateException: JBWEB000029: Cannot reset buffer after response has been committed
at org.apache.catalina.connector.Response.resetBuffer(Response.java:682) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.connector.Response.resetBuffer(Response.java:702) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:515) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:370) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:488) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:508) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)
at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:806)
at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)
at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:847)
at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_38]
at org.jboss.threads.JBossThread.run(JBossThread.java:122)
根据我对Omnifaces文档的分析，我想，异常是由于HttpServletRequest对象中的一个名为ATTRIBUTE_ERROR_EXCEPTION的属性。但它应该被删除，因为我正在使用来自omnifaces的FullAjaxExceptionHandler#handle()。
Events.addCallbackAfterPhaseListener(PhaseId.RENDER_RESPONSE, new Callback.Void() {
@Override
public void invoke() {
request.removeAttribute(ATTRIBUTE_ERROR_EXCEPTION);
}
});
上面的代码没有删除该属性。
我可以删除该属性以消除该错误吗？ 该属性的主要目的是什么？和 如何克服java.lang.IllegalStateException：在这种情况下？