IllegalStateException：getAttribute：会话已经失效

时间：2011-01-28 10:13:39

标签： session jsf jboss icefaces illegalstateexception

我在JBoss 5.1.0上运行的第一个JSF / IceFaces（版本1.8.2）应用程序出了问题。

我在一段时间后收到一个例外，告诉我会话问题。这很奇怪，因为我根本不在代码中使用会话。以下日志显示，由于此错误（来自JBoss），我的后备bean都无法实例化：

com.sun.faces.mgbean.ManagedBeanCreationException: Cant instantiate class: bean.Abgrenzungsreise.
    at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:191)
    at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:106)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:368)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:222)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:86)
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
    at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
    at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:61)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:107)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
    at javax.faces.component.UISelectItems.getValue(UISelectItems.java:141)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.getSelectItems(MenuRenderer.java:637)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.countSelectOptionsRecursive(MenuRenderer.java:448)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.renderSelect(MenuRenderer.java:377)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:119)
    at com.icesoft.faces.component.ext.renderkit.MenuRenderer.encodeEnd(MenuRenderer.java:51)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861)
    at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:370)
    at com.icesoft.faces.renderkit.dom_html_basic.GridRenderer.encodeChildren(GridRenderer.java:208)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
    at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:358)
    at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
    at com.icesoft.faces.component.util.CustomComponentUtils.renderChild(CustomComponentUtils.java:339)
    at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.writeTabCell(PanelTabSetRenderer.java:977)
    at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.encodeEnd(PanelTabSetRenderer.java:423)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:503)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:456)
    at com.icesoft.faces.application.D2DViewHandler.renderView(D2DViewHandler.java:159)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at com.icesoft.faces.webapp.http.core.JsfLifecycleExecutor.apply(JsfLifecycleExecutor.java:19)
    at com.icesoft.faces.context.View$2$1.respond(View.java:48)
    at com.icesoft.faces.webapp.http.servlet.ServletRequestResponse.respondWith(ServletRequestResponse.java:201)
    at com.icesoft.faces.context.View$2.serve(View.java:77)
    at com.icesoft.faces.context.View.servePage(View.java:149)
    at com.icesoft.faces.webapp.http.core.SingleViewServer.service(SingleViewServer.java:52)
    at com.icesoft.faces.webapp.http.common.ServerProxy.service(ServerProxy.java:11)
    at com.icesoft.faces.webapp.http.servlet.MainSessionBoundServlet$4.service(MainSessionBoundServlet.java:149)
    at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:24)
    at com.icesoft.faces.webapp.http.servlet.BasicAdaptingServlet.service(BasicAdaptingServlet.java:16)
    at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:23)
    at com.icesoft.faces.webapp.http.servlet.SessionDispatcher.service(SessionDispatcher.java:53)
    at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:23)
    at com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:131)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:638)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:444)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:382)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:310)
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:696)
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:667)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:58)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:662)
Caused by: com.icesoft.faces.webapp.http.core.SessionExpiredException: User session has expired or it was invalidated.
    at com.icesoft.faces.webapp.http.servlet.ProxyHttpSession.getAttribute(ProxyHttpSession.java:77)
    at com.icesoft.faces.webapp.http.servlet.ServletSessionAttributeMap.getAttribute(ServletSessionAttributeMap.java:16)
    at com.icesoft.faces.context.AbstractAttributeMap.containsKey(AbstractAttributeMap.java:85)
    at com.sun.faces.mgbean.BeanManager.isBeanInScope(BeanManager.java:177)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:82)
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
    at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
    at bean.Abgrenzungsreise.(Abgrenzungsreise.java:39)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at java.lang.Class.newInstance0(Class.java:355)
    at java.lang.Class.newInstance(Class.java:308)
    at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:186)
    ... 86 more 

Caused by: java.lang.IllegalStateException: getAttribute: Session already invalidated
    at org.apache.catalina.session.StandardSession.getAttribute(StandardSession.java:1032)
    at org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessionFacade.java:110)
    at com.icesoft.faces.webapp.http.servlet.ProxyHttpSession.getAttribute(ProxyHttpSession.java:75)
    ... 100 more
2011-01-28 08:05:54,326 ERROR [com.icesoft.faces.context.View] (http-0.0.0.0-8080-3) Problem encountered during View.servePage 
com.sun.faces.mgbean.ManagedBeanCreationException: Cant instantiate class: bean.Abgrenzungsreise.
    at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:191)
    at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:106)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:368)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:222)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:86)
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
    at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
    at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:61)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:107)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
    at javax.faces.component.UISelectItems.getValue(UISelectItems.java:141)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.getSelectItems(MenuRenderer.java:637)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.countSelectOptionsRecursive(MenuRenderer.java:448)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.renderSelect(MenuRenderer.java:377)
    at com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:119)
    at com.icesoft.faces.component.ext.renderkit.MenuRenderer.encodeEnd(MenuRenderer.java:51)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861)
    at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:370)
    at com.icesoft.faces.renderkit.dom_html_basic.GridRenderer.encodeChildren(GridRenderer.java:208)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
    at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:358)
    at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:96)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
    at com.icesoft.faces.component.util.CustomComponentUtils.renderChild(CustomComponentUtils.java:339)
    at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.writeTabCell(PanelTabSetRenderer.java:977)
    at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.encodeEnd(PanelTabSetRenderer.java:423)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:503)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:497)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:456)
    at com.icesoft.faces.application.D2DViewHandler.renderView(D2DViewHandler.java:159)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at com.icesoft.faces.webapp.http.core.JsfLifecycleExecutor.apply(JsfLifecycleExecutor.java:19)
    at com.icesoft.faces.context.View$2$1.respond(View.java:48)
    at com.icesoft.faces.webapp.http.servlet.ServletRequestResponse.respondWith(ServletRequestResponse.java:201)
    at com.icesoft.faces.context.View$2.serve(View.java:77)
    at com.icesoft.faces.context.View.servePage(View.java:149)
    at com.icesoft.faces.webapp.http.core.SingleViewServer.service(SingleViewServer.java:52)
    at com.icesoft.faces.webapp.http.common.ServerProxy.service(ServerProxy.java:11)
    at com.icesoft.faces.webapp.http.servlet.MainSessionBoundServlet$4.service(MainSessionBoundServlet.java:149)
    at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:24)
    at com.icesoft.faces.webapp.http.servlet.BasicAdaptingServlet.service(BasicAdaptingServlet.java:16)
    at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:23)
    at com.icesoft.faces.webapp.http.servlet.SessionDispatcher.service(SessionDispatcher.java:53)
    at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:23)
    at com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:131)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:638)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:444)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:382)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:310)
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:696)
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:667)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:58)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:662)
Caused by: com.icesoft.faces.webapp.http.core.SessionExpiredException: User session has expired or it was invalidated.
    at com.icesoft.faces.webapp.http.servlet.ProxyHttpSession.getAttribute(ProxyHttpSession.java:77)
    at com.icesoft.faces.webapp.http.servlet.ServletSessionAttributeMap.getAttribute(ServletSessionAttributeMap.java:16)
    at com.icesoft.faces.context.AbstractAttributeMap.containsKey(AbstractAttributeMap.java:85)
    at com.sun.faces.mgbean.BeanManager.isBeanInScope(BeanManager.java:177)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:82)
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
    at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
    at bean.Abgrenzungsreise.(Abgrenzungsreise.java:39)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at java.lang.Class.newInstance0(Class.java:355)
    at java.lang.Class.newInstance(Class.java:308)
    at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:186)
    ... 86 more
Caused by: java.lang.IllegalStateException: getAttribute: Session already invalidated
    at org.apache.catalina.session.StandardSession.getAttribute(StandardSession.java:1032)
    at org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessionFacade.java:110)
    at com.icesoft.faces.webapp.http.servlet.ProxyHttpSession.getAttribute(ProxyHttpSession.java:75)
    ... 100 more

我发现在最后一次用户活动后半小时就抛出了异常。

2 个答案:

答案 0 :(得分：2)

IceFaces论坛报道了同样的问题：

建议的解决方案是：

  

一旦我们将异步模式设置为

，就会发生这种情况 
<!-- Specifies to the ICEfaces framework that synchronous update mode is to be
used. By default, ICEfaces uses asynchronous update mode to support
server-initiated updates (AJAX push). Setting to true will enable
synchronous update mode and disable AJAX push features. -->
<context-param>
    <param-name>com.icesoft.faces.synchronousUpdate</param-name>
    <param-value>true</param-value>
</context-param>
     

当这是假的时候，我们得到了很好的小会话超时消息。   当这是真的时，会话超时行为是堆栈跟踪。

和

  

与此同时，我已经从ICEfaces 1.8.2切换到svn存储库中的内容（1.8.3+）。而且行为也发生了变化。没有崩溃了。

关于你没有在任何地方使用会话的声明，stacktrace告诉它在抛出此异常时尝试创建会话范围的托管bean。所以你肯定在使用会话：）

根据评论

更新：您确实不应将（基于请求!!）FacesContext分配为static变量。此外，需要在<managed-property>中faces-config.xml注入其他bean。否则它根本不是“注入”，而只是手动访问另一个bean。通过注入，您可以让JSF将其他bean设置为当前bean的属性。可以找到一个示例here。

答案 1 :(得分：1)

异常的原因在于我的SessionBean类 我上面问过原因是否可以通过facesContext将bean注入另一个bean。 现在我给出自己的答案：“是的，这可能是原因。”

public class MySessionBean {
    private static FacesContext facesContext = FacesContext.getCurrentInstance();
    private utils.AnotherSessionBean injectedSessionBean = (utils.AnotherSessionBean) facesContext.getApplication().getELResolver().getValue(facesContext.getELContext(), null, "anotherSessionBean");
    // ...
}

我可以自由地在任何方法或构造函数之外实例化当前的FacesContext，这不是一个好主意，因为在会话超时后我使用了旧的或不使用会话上下文。 MySessionBean已重新加载或获取它的新实例，但它没有刷新FacesContext。其结果如上所述^^

结论：因此，让FacesContext属于方法或构造函数的代码块。

非常感谢你的帮助！

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