If you are using the Hibernate object-relational mapper, some of the constraints are taken into account when creating the DDL for your model (see "Hibernate metadata impact").In addition to the constraints defined by the Bean Validation API, Hibernate Validator provides several useful custom constraints which are listed below.The implementation itself as well as the Bean Validation API and TCK are all provided and distributed under the Apache Software License 2.0.
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.
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.
a lot of useful information about the cause of the validation failure can be determined. The values under "Example" column refer to Example 2.14, “Using Hibernate Validator comprises a basic set of commonly used constraints.
For instance you can add the following dependency to use the JSR 341 reference implementation: EE, JSR 346). Assert.assert Equals; public class Car Test In this chapter you will learn how to declare (see Section 2.1, “Declaring bean constraints”) and validate (see Section 2.2, “Validating bean constraints”) bean constraints.
If your application runs in an environment which does not provide this integration out of the box, you may use the Hibernate Validator CDI portable extension by adding the following Maven dependency to your POM: Note that adding this dependency is usually not required for applications running on a Java EE application server. Section 2.3, “Built-in constraints” provides an overview of all built-in constraints coming with Hibernate Validator.
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With one exception also these constraints apply to the field/property level, only .
The former allows to add tags without any attributes, whereas the latter allows to specify tags and optionally allowed attributes as well as accepted protocols for the attributes using the annotation Checks whether the given script can successfully be evaluated against the annotated element.
It is specifically not tied to either web or persistence tier, and is available for both server-side application programming, as well as rich client Swing application developers.