J2EE listeners mini tutorial

You can listen to servlet container  and http session events using

  • javax.servlet.ServletContextListener
  • javax.servlet.http.HttpSessionListener

ServletContextListener :
This interface contains two methods :

  • public void contextInitialized(ServletContextEvent sce);
  • public void contextDestroyed(ServletContextEvent sce);

The HttpSessionListener interface also contains just two methods, for session creation and invalidation events respectively :

  • public void sessionCreated(HttpSessionEvent se);
  • public void sessionDestroyed(HttpSessionEvent se);

There are also these:

HttpSessionBindingListener
HttpSessionAttributeListener
HttpSessionActivationListener

ServletContextAttributeListener

(These are only available from a particular j2ee version. So check the j2ee version before using them)

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