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A Bright, Shiny Service: Sparklines (2 tags)
Joe Gregorio describes how to implement a sparklines web service and web application, and also provides Python and Javascript code for both. Very Web 2.0!

Don't Let Hibernate Steal Your Identity (2 tags)
Hibernate has one set of ideas about how to make something unique, such as using a database sequence number as an ID. But this clashes with Java's need for implementations of equals() and hashCode() that determine identity for objects, even those that haven't yet made a trip to the database and thus can't have a sequence number. James Brundege has an option that should satisfy both Hibernate and Java.