How to do one time initialization with tomcat

[Divick Kishore]

Hi,
    I want to do one time initialization of some data at my back end 
code when using tomcat as my container. To be precise I want to 
initialize the DB connection to mysql db and later when connection is 
requested from my DB layer I want to simply return the connection from a 
connection pool. Thus loading of driver is one time thing. But I don't 
know how to invoke some code which is done only once?

I understand that modifying server.xml and web.xml and putting the 
driver jar in appropriate place the tomcat loads the driver 
automatically and then using code like this one can get connection:

   ///The following code needs to be executed only once
   Context ctx = new InitialContext();
   if(ctx == null )
           throw new Exception("Boom - No Context");

     DataSource ds =  
(DataSource)ctx.lookup("java:comp/env/jdbc/javatest");

but this code needs to be invoked from somewhere so that I have 
reference to DataSource but how to invoke it is not known and that is 
what my confusion is. Please help.

Thanks,
Divick

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