How to schedule events using ServletContextListener??

Hello all
I have a servlet which contains a hashtable. I need to update it every hour with some new entries. I have read some of the other threads which suggest one to implement a ServletContextListener, and when the servletcontext is created or destroyed, certain methods would be called. So can I have my servlet implement ServletContextListener and write methods to do the same? When is the servletcontext created or destroyed?? Can I do it every hourly??
Please help me with suggestions and any example code would be great.
thanks a lot
Mahesh :)

in servlet specification 2.3 I found
Servlet Context Events
Lifecycle: The servlet context has just been created and is available to service its first request, or the servlet context is about to be shut down
An Example of Listener Use:
To illustrate a use of the event scheme, consider a simple web application containing
a number of servlets that make use of a database. The developer has provided a
servlet context listener class for management of the database connection.
1. When the application starts up, the listener class is notified. The application
logs on to the database, and stores the connection in the servlet context.
2. Servlets in the application access the connection as needed during activity in
the web application.
3. When the web server is shut down, or the application is removed from the web
server, the listener class is notified and the database connection is closed.
ServletContext created when application deployed or server started
ServletContext destroyed when for example server was shut down

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========================================================
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Hi
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Hi,
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T Code : SM62 --> To Create an Event.
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http://help.sap.com/saphelp_sem40bw/helpdata/EN/86/6ff03b166c8d66e10000000a11402f/frameset.htm
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