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Hibernate Validator requires an implementation of the Unified Expression Language (JSR 341) for evaluating dynamic expressions in constraint violation messages (see Section 4.1, “Default message interpolation”).When your application runs in a Java EE container such as JBoss AS, an EL implementation is already provided by the container.

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Validating data is a common task that occurs throughout all application layers, from the presentation to the persistence layer.

The API is not tied to a specific application tier nor programming model.

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.

There are no JPMS module descriptors provided yet, but Hibernate Validator is usable as automatic modules. When a class implements an interface or extends another class, all constraint annotations declared on the super-type apply in the same manner as the constraints specified on the class itself.

package org.hibernate.validator.referenceguide.chapter01; import javax.validation.constraints. To make things clearer let’s have a look at the following example: The Bean Validation API does not only allow to validate single class instances but also complete object graphs (cascaded validation).

Hibernate Validator supports running with a security manager being enabled. This means the validation engine directly accesses the instance variable and does not invoke the property accessor method even if such an accessor exists.

To do so, you must assign several permissions to the code bases of Hibernate Validator, the Bean Validation API and the code base calling Bean Validation. If your model class adheres to the Java Beans standard, it is also possible to annotate the properties of a bean class instead of its fields. Not Null; public class Car Last but not least, a constraint can also be placed on the class level.

The following shows how to do this via a policy file as processed by the Java default policy implementation: The Wild Fly application server contains Hibernate Validator out of the box. Example 2.2, “Property-level constraints” uses the same entity as in Example 2.1, “Field-level constraints”, however, property level constraints are used. In this case not a single property is subject of the validation but the complete object.

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