什么可能导致这个?我的配置类没什么不同或奇怪的.我真的很感激任何关于什么样的事情可能导致这种行为的想法.我用Google搜索并搜索,找不到任何东西.
ETA:如果重要,则属性名称为“configuration”.我找不到任何关于保留字或任何内容的东西……我在servlet中设置这个属性的功能与其他一些例如“user”相同.然后我重定向到一个试图获得用户和配置的JSP.所以一切都在同一时间进行.用户很好,而配置甚至没有出现在属性名称列表中.
ETA2:以下是日志中不断发生的异常:
java.lang.Exception at pms.SessionListener.printstacktrace(UnkNown Source) at pms.SessionListener.attributeAdded(UnkNown Source) at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1498) at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1390) at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:154) at PMS.getTaskInfo(UnkNown Source) at PMS.doGet(UnkNown Source) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:282) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:357) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1687) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(UnkNown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(UnkNown Source) at java.lang.Thread.run(UnkNown Source)
解决方法
>可能会有两个不同的会话.
>可能会有一些代码从会话中删除配置对象.
>其他人?
这是一种可以测试以确定究竟发生了什么的方法.
您可以实现两个单独的侦听器接口来侦听特定的会话事件:javax.servlet.http.HttpSessionListener和javax.servlet.http.HttpSessionAttributeListener
我将使用一个类来实现这两个接口,该类将记录每个事件期间发生的事情以及事件来自哪个会话.
您应该能够轻松地将侦听器添加到web.xml文件中,以便它们实际上可以通过tomcat设置为会话的侦听器.
编辑
这是一个可以作为会话监听器放入web.xml的类. BalusC和我都建议您尝试这种方法来调试问题.如果您在设置“配置”属性的方式中看到任何有趣的内容,请只是幽默我们并告诉我们?
import javax.servlet.http.HttpSessionActivationListener; import javax.servlet.http.HttpSessionAttributeListener; import javax.servlet.http.HttpSessionBindingEvent; import javax.servlet.http.HttpSessionBindingListener; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener; public class SessionListener implements HttpSessionListener,HttpSessionAttributeListener,HttpSessionBindingListener,HttpSessionActivationListener { public void valueBound(HttpSessionBindingEvent event) { System.out.println("valueBound: " + event.getName() + " : " + event.getValue()); System.out.println(" session: " + event.getSession().getId()); this.printstacktrace(); } public void valueUnbound(HttpSessionBindingEvent event) { System.out.println("valueUnbound: " + event.getName() + " : " + event.getValue()); System.out.println(" session: " + event.getSession().getId()); this.printstacktrace(); } public void attributeAdded(HttpSessionBindingEvent event) { System.out.println("attributeAdded: " + event.getName() + " : " + event.getValue()); System.out.println(" session: " + event.getSession().getId()); this.printstacktrace(); } public void attributeRemoved(HttpSessionBindingEvent event) { System.out.println("attributeRemoved: " + event.getName() + " : " + event.getValue()); System.out.println(" session: " + event.getSession().getId()); this.printstacktrace(); } public void attributeReplaced(HttpSessionBindingEvent event) { System.out.println("attributeReplaced: " + event.getName() + " : " + event.getValue()); System.out.println(" session: " + event.getSession().getId()); this.printstacktrace(); } public void sessionCreated(HttpSessionEvent event) { System.out.println("sessionCreated: " + event.getSession().getId()); this.printstacktrace(); } public void sessionDestroyed(HttpSessionEvent event) { System.out.println("sessionDestroyed: " + event.getSession().getId()); this.printstacktrace(); } public void sessionDidActivate(HttpSessionEvent event) { System.out.println("sessionDidActivate: " + event.getSession().getId()); this.printstacktrace(); } @Override public void sessionWillPassivate(HttpSessionEvent event) { System.out.println("sessionWillPassivate: " + event.getSession().getId()); this.printstacktrace(); } private void printstacktrace() { try { if (true) { throw new Exception(); } } catch (Exception e) { e.printstacktrace(); } } }
请将上面的类添加到代码中,然后将以下内容添加到过滤器映射和servlet映射之间的web.xml文件中:
<listener> <listener-class><your.package.name>SessionListener</listener-class> </listener>
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