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Servlet Custom Session Binding Listener

import java.util.*; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class MyServlet extends HttpServlet {       public void doGet(HttpServletRequest req, HttpServletResponse res)                                throws ServletException, IOException {     res.setContentType("text/plain");     PrintWriter out = res.getWriter();     // Get the current session object, create one if necessary     HttpSession session = req.getSession();     // Add a CustomBindingListener     session.setAttribute("bindings.listener",                          new CustomBindingListener(getServletContext()));     out.println("This page intentionally left blank");   } } class CustomBindingListener implements HttpSessionBindingListener {   // Save a ServletContext to be used for its log() method   ServletContext context;   public CustomBindingListener(ServletContext context) {     this.context = context;   }   public void valueBound(HttpSessionBindingEvent event) {     context.log("[" + new Date() + "] BOUND as " + event.getName() +                 " to " + event.getSession().getId());   }   public void valueUnbound(HttpSessionBindingEvent event) {     context.log("[" + new Date() + "] UNBOUND as " + event.getName() +                 " from " + event.getSession().getId());   } } <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE web-app     PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"     "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"> <web-app>     <servlet><servlet-name>MyServletName</servlet-name>              <servlet-class>MyServlet</servlet-class>                   </servlet>          <servlet-mapping><servlet-name>MyServletName</servlet-name>         <url-pattern>/index.html</url-pattern>     </servlet-mapping> </web-app>