The Preferences API seems to be very useful for J2EE applications. However, I don't see much about it in the literature. Is it used with Eclipse, WSAD, or WebLogic? See C:\j2sdk5.0\docs\api\java\util\prefs\Preferences.html and http://java.sun.com/developer/Books/javaprogramming/jdk14/javapch10.PDF .
It seems to be a great facility for use with various deployment descriptors, and certain data in JNDI. But is it being ignored in J2ee 1.4?
Juan Rolando Prieur-Reza, M.S., LSSBB, SCEA, SCBCD, SCWCD, SCJP/1.6, IBM OOAD, SCSA
Not sure what you have in mind, but it's generally used more for user and application preferences, not fro actual application data. E.g., on Windows it's backed by the Registry, which should give you an idea of what it's used for.