Session and Context listener for web application

package com.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.utility.Utilities;

/**
 * **********************************************************************
 * @ServletContextListener-----------------------------------------------
 * The listener interface for receiving appContextAndSession events.
 * The class that is interested in processing a appContextAndSession
 * event implements this interface, and the object created
 * with that class is registered with a component using the
 * component's <code>addAppContextAndSessionListener<code> method. When
 * the appContextAndSession event occurs, that object's appropriate
 * method is invoked.
 * @see AppContextAndSessionEvent
 * ************************************************************************
 * @HttpSessionListener----------------------------------------------------
 * The listener interface for receiving session events.
 * The class that is interested in processing a session
 * event implements this interface, and the object created
 * with that class is registered with a component using the
 * component's <code>addSessionListener<code> method. When
 * the session event occurs, that object's appropriate
 * method is invoked.
 * @see SessionEvent
 */
public class AppContextAndSessionListener implements ServletContextListener,HttpSessionListener {

public AppContextAndSessionListener() {
super();
logger.info("AppContextAndSessionListener instantiated..");
}

/** The logger. */
protected final Log logger = LogFactory.getLog(getClass());

/* (non-Javadoc)
* @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
*/
@Override
public void contextDestroyed(ServletContextEvent arg0) {
logger.info("contextDestroyed destroyed..");
}

/* (non-Javadoc)
* @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
*/
@Override
public void contextInitialized(ServletContextEvent arg0) {
logger.info("contextDestroyed initialized..");
}


/* (non-Javadoc)
* @see javax.servlet.http.HttpSessionListener#sessionCreated(javax.servlet.http.HttpSessionEvent)
*/
public void sessionCreated(HttpSessionEvent httpSessionEvent) {
logger.info("SessionListener creating a new session..");
HttpSession sess=httpSessionEvent.getSession();
sess.setAttribute("sessionTimeOut", sess.getMaxInactiveInterval());
}


/* (non-Javadoc)
* @see javax.servlet.http.HttpSessionListener#sessionDestroyed(javax.servlet.http.HttpSessionEvent)
*/
public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
logger.info("SessionListener destroying the session..");
if(Utilities.getSessionCount()!=0){
Utilities.decrementCounter();
logger.info("Session counter decremented!");
}
}
}