當我嘗試從請求中獲取會話時,如果會話過期,會導致空指針異常。下面給出的是代碼的一部分。我在第三行得到例外。request.getSession(false)會導致java.lang.IllegalStateException
public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpReq = (HttpServletRequest) req;
HttpSession session = httpReq.getSession(false);
這裏是堆棧跟蹤:
java.lang.IllegalStateException: getLastAccessedTime: Session already invalidated
at org.apache.catalina.session.StandardSession.getLastAccessedTime(StandardSession.java:423)
at org.apache.catalina.session.StandardSessionFacade.getLastAccessedTime(StandardSessionFacade.java:84)
at com.myapp.admin.CustomerContext.valueUnbound(CustomerContext.java:806)
at org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1686)
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:801)
at org.apache.catalina.session.StandardSession.isValid(StandardSession.java:576)
at org.apache.catalina.connector.Request.doGetSession(Request.java:2386)
at org.apache.catalina.connector.Request.getSession(Request.java:2120)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833)
at com.myapp.ui.web.filter.ApplicationSessionFilter.doFilter(ApplicationSessionFilter.java:45)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
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 com.myapp.ui.web.filter.ErrorFilter.doFilter(ErrorFilter.java:42)
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:127)
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:298)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:662)
可能沒有任何會話附加到他的請求。因爲如果您沒有創建任何會話,getSession(fasle)將返回null。 – Ankit 2011-04-29 12:26:40
我們使用tomcat 6.0 – coder247 2011-04-29 12:26:57
顯示整個堆棧跟蹤 – Bozho 2011-04-29 12:40:02