How to perform JavaBeans Validation

JavaBeans Validation, introduced with Java EE 6, provides a standardized annotation-based approach for validating data in Java applications before it is processed. JavaBeans are reusable, serializable objects that conventionally use private properties, getters, setters, and no-argument constructors to encapsulate and transfer application data. Using Hibernate Validator, the reference implementation of Bean Validation, developers can add Maven dependencies and apply built-in constraints such as `@NotNull`, `@Size`, `@Pattern`, `@Min`, and `@Max` to bean fields, getters, or constructor parameters. A Validator checks bean instances against these rules and returns constraint violations that identify invalid properties and their associated messages. Examples demonstrate validating a string’s required length, enforcing email and password requirements through regular expressions, and handling failures by displaying validation errors. The material also explains how developers can create custom constraints by defining an annotation, implementing `ConstraintValidator` logic, and applying the resulting annotation to bean properties, such as restricting a search term to alphanumeric characters.

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