title: implementing HttpSessionListener
body: <p>I am facing a <a href="https://stackoverflow.com/questions/1439743/whats-wrong-with-my-listener-in-my-web-xml">similar problem</a> and have learnt that my listener class will be instantiated when the web.xml is read. I have few functions in the listener class that are used by the main servlet's doPost(which interacts with the database(mysql) to read/write data regarding the users.)along with the methods of HttpSessionListener. So what prevents the container from loading the listener class. I am getting the 404 error. </p>
  
  <p>snippet:</p>
  
  <pre><code>public class EntryServlet extends HttpServlet{
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
  
  
      PlayersList playa = new PlayersList(); //listener class
  
      if(!playa.isExisting(params[3])){
          if(params[1].equals("Register")){           
              playa.addPlayer(params);
          }
      }       
      else
          out.println("Username already exists");
  
  
      if(playa.isExisting(params[argUName],params[argUPwd])){
          HttpSession session = request.getSession(true);     
          session.setMaxInactiveInterval(600);            
          HashMap playersMap = playa.getActivePlayers();
          //code . .
      }
      else
          out.println("Couldn't locate player Name!");    
          out.println(playa.getIn());         
  }
  </code></pre>
  
  <p>Listener class:</p>
  
  <pre><code>public class PlayersList implements HttpSessionListener{
  private Connection cn;
  private Statement st;
  
  PlayersList(){
      try{
          Class.forName("com.mysql.jdbc.Driver");
          cn =  DriverManager.getConnection("jdbc:mysql://localhost/homeDbse\'","root","");
          st = cn.createStatement();
      }
      catch(ClassNotFoundException ce){}
      catch(SQLException se){}
      catch(Exception e){}
  }   
  
  public boolean isExisting(String player){
      //interaction with dbse
  }   
  
  public void addPlayer(String[] args){
      //interaction with dbse
  
  }   
  public void sessionCreated(HttpSessionEvent se){
      //session managing
  }   
  public void sessionDestroyed(HttpSessionEvent se){
      //session managing
  }
  </code></pre>