Hibernate Validator 4.x is the reference implementation for JSR 303 – Bean Validation.JSR 303 defines a metadata model and API for JavaBean validation. The default metadata source is annotations, with the ability to override and extend the meta-data through the use of XML validation descriptors. The API is not tied to a specific application tier or programming model. It is specifically not tied to either the web tier or the persistence tier, and is available for both server-side application programming, as well as rich client Swing application developer. This podcast gives a whistle-stop tour demonstrating an entity-field annotation that prevents entry of duplicate-keyed records.

http://skillsmatter.com/podcast/java-jee/seam-hibernatorvalidator

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