Spring 2.5會話屬性

Question

在我的web應用程序中，我定義了一個變量作爲會話屬性。

 @Controller 
     @SessionAttributes({"dashboardfbo"}) 
     public class QuestController { 
     @RequestMapping(value="/quest/start", method=RequestMethod.GET,params="questId") 
     public ModelAndView start() 
     { 
      String viewName = null; 
      viewName = "redirect:/quest/nextquest.htm?navigate="+"start"; 
      return new ModelAndView(viewName); 

     } 
     . 
     . 
     } 

當我在屏幕上說有鏈接，點擊映射/quest.start.htm當會話超時，我點擊該鏈接我重定向到登錄其所需的頁面上的儀表盤屏幕。但是當我再次登錄到應用程序時，我得到了以下錯誤。

注意：在儀表板屏幕顯示在用戶界面之前，我在之前的調用中設置了dashboardfbo。

org.springframework.web.HttpSessionRequiredException: Session attribute 'dashboardfbo' required - not found in session 
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.raiseSessionRequiredException(AnnotationMethodHandlerAdapter.java:550) 
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveModelAttribute(HandlerMethodInvoker.java:365) 
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:210) 
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:132) 
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:326) 
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:313) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    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 com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129) 
    at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:112) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378) 
    at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109) 
    at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.ui.SessionFixationProtectionFilter.doFilterHttp(SessionFixationProtectionFilter.java:67) 
    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101) 
    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105) 
    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91) 
    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:278) 
    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89) 
    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235) 
    at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) 
    at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) 
    at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175) 
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236) 
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) 
    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:233) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) 
    at java.lang.Thread.run(Thread.java:619) 

請幫忙？

Answer 1

我得到了下面的辦法解決這個

@Controller 
     @SessionAttributes({"dashboardfbo"}) 
     public class QuestController { 

     @ModelAttribute("dashboardfbo") 
     public DashboardFbo setDashBoardFbo(DashboardFbo dashboardFbo, HttpSession session){ 
     DashboardFbo sessionDashboardFbo = (DashboardFbo) session.getAttribute("dashboardfbo"); 
     if(sessionDashboardFbo!=null){ 
      return sessionDashboardFbo; 
     } 
     return dashboardFbo; 
    } 
     @RequestMapping(value="/quest/start", method=RequestMethod.GET,params="questId") 
     public ModelAndView start() 
     { 
      String viewName = null; 
      viewName = "redirect:/quest/nextquest.htm?navigate="+"start"; 
      return new ModelAndView(viewName); 

     } 
     . 
     . 
     } 

時明確設置通過setter方法的dashboardfbo我的問題得到了解決。但我無法找出造成這個問題的根本原因。也許有人幫我找到根本原因。