public class SessionListener implements HttpSessionListener {		static Logger log = Logger.getLogger(			SessionListener.class.getName());    private static Map
    
      map = new               HashMap
     
      ();  	static private int sessionCount = 0;	    public void sessionCreated(HttpSessionEvent event) {	        String id = event.getSession().getId();              log.debug("session created : " + id);  	        synchronized (this) {	            sessionCount++;	            map.put(id, event.getSession());	        }	 	       log.info("Session Created: " + event.getSession().getId());	       log.info("Total Sessions: " + sessionCount);	    }	 	    public void sessionDestroyed(HttpSessionEvent event) {	        synchronized (this) {	            sessionCount--;	        }	        log.info("Session Destroyed: " + event.getSession().getId());	        log.info("Total Sessions: " + sessionCount);	    }	    public static HttpSession getHttpSession(String sessionID)  	    {  	        return map.get(sessionID);  	    }}
     
    

in web.xml

    		
     
      com.ipcs.listener.SessionListener