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Implements HttpSessionBindingListener

import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import javax.servlet.http.HttpSessionBindingEvent; import javax.servlet.http.HttpSessionBindingListener; public class SessionBindings 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 {   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());   } }