There are the following three types of bean constraints: When using field-level constraints field access strategy is used to access the value to be validated.This means the validation engine directly accesses the instance variable and does not invoke the property accessor method even if such an accessor exists.package org.hibernate.validator.referenceguide.chapter01; import javax.validation.constraints. In this chapter you will learn how to declare (see Declaring bean constraints) and validate (see Validating bean constraints) bean constraints.
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.
For instance you can add the following two dependencies to use the JSR 341 reference implementation: EE, JSR 346). Assert.assert Equals; public class Car Test Java 8 introduces several enhancements which are valuable from a Hibernate Validator point of view.
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: Hibernate Validator supports running with a security manager being enabled. This section briefly introduces the Hibernate Validator features based on Java 8.
constraint Violations = validator.validate( car ); assert Equals( 1, constraint Violations.size() ); assert Equals( "'null' is not a valid car part.", constraint Violations.iterator().next()Message() ); assert Equals( "parts.
constraint Violations = validator.validate( car ); assert Equals( 1, constraint Violations.size() ); assert Equals( "20 is outside the max fuel consumption.", constraint Violations.iterator().next()Message() ); constraint Violations = validator.validate( car ); assert Equals( 1, constraint Violations.size() ); assert Equals( "Not enough towing capacity.", constraint Violations.iterator().next()Message() ); assert Equals( "towing Capacity", constraint Violations.iterator().next()Property Path()String() ); must be registered for the custom type allowing to retrieve the value to validate (see Unwrapping values).
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.
Constraints in Bean Validation are expressed via Java annotations.
In this section you will learn how to enhance an object model with these annotations.
This means only Hibernate Validator and the Bean Validation API themselves need the listed permissions. The Type argument constraints chapter provides further information on how to apply and use type argument constraints.