How to close JDBC client connections in JSP (9IDS Jdeveloper)

Can anyone tell me how to close JDBC connections neatly through JSP in Oracle 9IDS Jdeveloper.
I have a developer who has deployed a WAR file (comprising JSP page) to the Tomcat webserver.
The page works fine except that it always leaves a JDBC client connection after the user closes the internet explorer window.
I've tried using dead connection detection without success.
At the operating system level, I have a script that can kill these sessions but I would prefer if theres some way the connection can be closed neatly through the JSP application.

Hi:
At database level you can:
See CONNECT_TIME and IDLE_TIME options to CREATE/ALTER PROFILE
Joao

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