Implementations of this interface receive notifications about
changes to the servlet context of the web application they are
part of.
To receive notification events, the implementation class
must be configured in the deployment descriptor for the web
application.
See Also:ServletContextEvent since: v 2.3
Notification that the servlet context is about to be shut down.
All servlets and filters have been destroy()ed before any
ServletContextListeners are notified of context
destruction.
Notification that the web application initialization
process is starting.
All ServletContextListeners are notified of context
initialization before any filter or servlet in the web
application is initialized.