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The default metadata source are annotations, with the ability to override and extend the meta-data through the use of XML.The API is not tied to a specific application tier nor programming model.All the validation methods have a var-args parameter which can be used to specify which validation groups shall be considered when performing the validation.If the parameter is not specified, the default validation group ( constraint Violations = validator.validate Property( car, "manufacturer" ); assert Equals( 1, constraint Violations.size() ); assert Equals( "must not be null", constraint Violations.iterator().next()Message() ); constraint Violations = validator.validate Value( Car.class, "manufacturer", null ); assert Equals( 1, constraint Violations.size() ); assert Equals( "must not be null", constraint Violations.iterator().next()Message() ); is for example used in the integration of Bean Validation into JSF 2 (see Section 11.2, “JSF & Seam”) to perform a validation of the values entered into a form before they are propagated to the model.You can learn more about the integration of Bean Validation and CDI in Section 11.3, “CDI”. Section 2.3, “Built-in constraints” provides an overview of all built-in constraints coming with Hibernate Validator.Hibernate Validator supports running with a security manager being enabled. When using field-level constraints field access strategy is used to access the value to be validated.Additionally, Hibernate Validator provides useful custom constraints (see Section 2.3.2, “Additional constraints”).
In order to use this constraint, an implementation of the Java Scripting API as defined by JSR 223 ("Scripting for the Java Platform") must be a part of the class path.
When your application runs in a Java EE container such as JBoss AS, an EL implementation is already provided by the container.
In a Java SE environment, however, you have to add an implementation as dependency to your POM file.
Validating data is a common task that occurs throughout all application layers, from the presentation to the persistence layer.
Often the same validation logic is implemented in each layer which is time consuming and error-prone.