java.lang.IllegalStateException: getAttribute: Session already invalidated

Issue

• What is the cause of this IllegalStateException:

2010-11-18 10:53:20,713 ERROR [org.jboss.seam.web.ExceptionFilter] could not destroy contexts   
java.lang.IllegalStateException: getAttribute:Session already invalidated  
        at org.jboss.web.tomcat.service.session.ClusteredSession.getAttribute(ClusteredSession.java:532)   
        at org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessionFacade.java:110)   
        at org.jboss.seam.mock.MockExternalContext$3.getAttribute(MockExternalContext.java:361)   
        at org.jboss.seam.mock.MockExternalContext$AttributeMap.get(MockExternalContext.java:385)   
        at org.jboss.seam.mock.MockExternalContext$AttributeMap.put(MockExternalContext.java:390)   
        at org.jboss.seam.contexts.ServerConversationContext.flush(ServerConversationContext.java:295)   
        at org.jboss.seam.contexts.Contexts.flushAndDestroyContexts(Contexts.java:387)   
        at org.jboss.seam.contexts.FacesLifecycle.endRequest(FacesLifecycle.java:112)   
        at org.jboss.seam.web.ExceptionFilter.endWebRequestAfterException(ExceptionFilter.java:137)   
        at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:71)   
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)   
        at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)   
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)   
        at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)   
        at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)   
        at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:368)   
        at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:495)   
        at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)   
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)   
        at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)   
        at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)   
        at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)   
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)   
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)   
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)   
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)   
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)   
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)   
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)   
        at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:97)   
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)   
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)   
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)   
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)   
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)   
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:543)   
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)   
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)   
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)   
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)   
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)   
        at java.lang.Thread.run(Thread.java:619)