最近准备集群，解决session共享的问题。最后发现自定义的SessionListener sessionDestroyed方法不执行。很奇怪，然后果断启用该方案。

public class SessionListener  implements HttpSessionListener,  HttpSessionAttributeListener{

    Logger log = LoggerFactory.getLogger(SessionListener.class);
    @Override
    public void attributeAdded(HttpSessionBindingEvent arg0) {

    }

    @Override
    public void attributeRemoved(HttpSessionBindingEvent arg0) {

    }

    @Override
    public void attributeReplaced(HttpSessionBindingEvent arg0) {

    }

    @Override
    public void sessionCreated(HttpSessionEvent arg0) {
        if(log.isDebugEnabled()) {
            log.debug("创建session");
        }
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent arg0) {

        if(log.isDebugEnabled()) {
            log.debug("摧毁session,id:{}",arg0.getSession().getId());
        }
    }

}

感谢万能的百度，找到解决办法：
http://blog.csdn.net/u011431312/article/details/76259394
不过还没亲自尝试