Bean Validation: Practical Examples from a Real-World Java EE 7 Application, at JavaOne Conference, San Francisco, CA, Monday, September 29, 2014

JSR 303 / 349 introduced Bean Validation for providing a facility for validating objects, object members, methods, and constructors. In Java EE environments, Bean Validation integrates with Java EE containers and services to enable developers to easily define and enforce validation constraints, enabling the rules to be defined once, rather than wherever they need validation (such as at the UI or API layer).