tomcat运行时session错误

Question

2013-6-14 9:42:32 org.apache.catalina.core.ContainerBase backgroundProcess
警告: Exception processing manager org.apache.catalina.session.StandardManager@1402d5a background process
java.lang.NullPointerException
    at com.tiancom.pas.common.framework.context.SessionContainer.valueUnbound(SessionContainer.java:41)
    at org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1654)
    at org.apache.catalina.session.StandardSession.expire(StandardSession.java:756)
    at org.apache.catalina.session.StandardSession.isValid(StandardSession.java:592)
    at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:680)
    at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:665)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1316)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
    at java.lang.Thread.run(Thread.java:619)

错误信息如上，个人猜测有可能与session登录超时有关，求指导。

Answer 1

参考了下这个帖子

发现我这的代码中HttpSessionBindingListener的子类代码如下：

public void valueUnbound(HttpSessionBindingEvent event) { 
    System.out.println("User:"+loginUser.getUserName()+" Being unbound...");
    this.setLoginUser( null ); //直接把loginuser对象赋值null
}

如果按帖子内容修改，如何修改？