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• Using Validation with Spring
• WebdataBinder
• Hibernate Validator Api
• Custom Hibernate Constraints
• Constraints avaialable
• The Spring MVC Showcase gives some nice examples of how validation works.

Important thing to note. Data binding occurs before Validation, so if you want to give error messages because a property is not in the correct format, you'll need to delay binding the data to a custom object. You may need to break the input message into its components parts before passing them to the service.