Spring 3.0 has a number of new features, one of which is support for JSR303. JSR303 adds annotation-driven validation for Java Beans which is intended to replace hand-coded validation code. This has obvious ramifications for Spring MVC as a key part of this framework includes support for validation of web forms using hand-coded Validator implementations. I'm gradually upgrading a Spring 2.x MVC application to Spring 3.0 at the moment, with the emphasis on gradual. So while I'd like to use JSR 303, I'm not ready yet to re-code the 50 odd Controller implementations to use the new annotation-driven style (even though I hate seeing warnings in Eclipse). Luckily, Spring makes it really easy to have the best of both worlds using the SpringValidatorAdapter. Put simply, this class wraps the JSR303 adapter and provides convenience methods to enable you to easily support the old style Validator interface methods. You can then use the annotations in your command/form objects and the old-school Validators in your Controller classes. Here is a simple example command object using the JSR 303 annotations. They are pretty self-evident and there are loads of blogs that explain what they do.
Read full article from Non-Repeatable Read: Using JSR 303 with "classic" Spring Validators (enter the SpringValidatorAdapter)
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