IllegalStateException: getAttribute: Session alrea

2019-07-07 04:31发布

站内问答 / 移动开发
877 2 5

I have a problem with my first JSF/IceFaces (version 1.8.2) application running on JBoss 5.1.0.

I recieve an exception after a while, telling me about session problems. This is weird, because i do not use sessions in my code at all. The following logs show that none of my backing beans can be instantiated because of this error (from JBoss):

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

I recognized that the exception is thrown an half hour after the last user activity.

2条回答
做自己的国王
2楼-- · 2019-07-07 04:43

The same problem has been reported on the IceFaces forums:

The proposed solutions were:

This was happening for us once we set the asynchronous mode off

<!-- 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>

When this was false we got the nice little session timed out message. When this was true, session timeout behaviour was stack trace.

and

In the meantime I've switched from ICEfaces 1.8.2 to what's in the svn repository at the moment (1.8.3+). And the behavior has changed. There is no crash anymore.

As to your statement that you aren't using the session anywhere, the stacktrace tells that it is attempting to create a session scoped managed bean when this exception was thrown. So you are definitely using the session :)

Update as per the comments: You should indeed definitely not assign the (request based!!) FacesContext as a static variable. Also, injecting of other beans needs to be taken place by <managed-property> in faces-config.xml. Otherwise it isn't "injecting" at all, but just manually accessing the other bean. With injecting, you're letting JSF do the work to set the other bean as a property of the current bean. An example can be found here.

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Melony?
3楼-- · 2019-07-07 04:51

The reason for the exception was in my SessionBean classes.
I asked above if the reason can be the injection of beans into another via the facesContext. Now i give the answer my self: "Yes it can be the reason."

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

I felt free to instantiate the current FacesContext outside of any method or the constructor, which was not a good idea, because after the session-timeout i used the old one or mabey no session context. MySessionBean was reloaded or get a new instance of it, but it didn't refresh the FacesContext. The result of this is described above^^

Conclusion: So getting the FacesContext belongs in the codeblock of a method or constructor.

Thank you very much for your help!

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