J2EE Bad Practices: System.exit()
From OWASP
This is a Vulnerability. To view all vulnerabilities, please see the Vulnerability Category page.
Abstract
A web application should not attempt to shut down its container.
Description
It is never a good idea for a web application to attempt to shut down the application container. A call to System.exit() is probably part of leftover debug code or code imported from a non-J2EE application.

