That's now official, the Bean Validation specification has been voted YES by the JCP expert committee. That's the culmination of two and a half years of work. (I know the vote has ended nov 2nd but nobody told me ;) )
Here is the latest draft before sending Bean Validation (JSR 303) to final stage (in pdf).
For the few who don't know yet ( ;) ), Bean Validation standardizes constraint declaration, definition, validation and metadata for the Java platform. Said otherwise, add an annotation to a property and hop it's validated.