servlet listener

The servlet provides the following listeners:

1. javax.servlet.ServletContextListener - Interface for receiving notification events about ServletContext lifecycle changes.
2. javax.servlet.ServletContextAttributeListener - Interface to receive notification events about ServletContext attribute changes.
3. javax.servlet.ServletRequestListener - Interface for receiving notification events about requests coming in and out of the scope of a web application.
4. javax.servlet.ServletRequestAttributeListener - Interface to receive notification events about ServletRequest attribute changes.
5. javax.servlet.http.HttpSessionListener - Interface to receive notification events about HttpSession lifecycle changes.
6. javax.servlet.http.HttpSessionAttributeListener - Interface for receiving notification events about HttpSession attribute changes.
7. javax.servlet.http.HttpSessionBindingListener - Causes objects to be notified when they are bound from session to binding or from it.
8. javax.servlet.http.HttpSessionActivationListener - Objects bound to a session may listen to container events notifying them that the session will be passivated and that the session will be activated.