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There's been plenty of discussion in the JPA group about my typesafe criteria proposal. My new favorite feature of the Java language is javax.annotation.Processor. Java 6 annotation processors are derived from the APT tool that existed in JDK 5, but are built into javac. Really, the name annotation processor is misleading, since this feature is only incidentally related to annotations. The Processor is really a fairly general purpose compiler plugin. If, like me, you've never been a fan of code generation, now is the time to reconsider. A Java 6 Processor can: