Event classes:
Events are basically occurrence of something. Changing the state of an object is
known as an event.
We can perform some important tasks at the occurrence of these exceptions, such
as counting total and current logged-in users, creating tables of the database
at time of deploying the project, creating database connection object etc.
There are many Event classes in the javax.servlet and javax.servlet.http
packages.
Event classes:
The event classes are as follows:
1)ServletRequestEvent
2)ServletContextEvent
3)ServletRequestAttributeEvent
4)ServletContextAttributeEvent
5)HttpSessionEvent
6)HttpSessionBindingEvent