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.
Validating xml in java
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.
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.
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.
Property-level constraints uses the same entity as in Field-level constraints, however, property level constraints are used.
To do so, just annotate a field or property representing a reference to another object with , these references will be followed up by the validation engine as well.
The validation engine will ensure that no infinite loops occur during cascaded validation, for example if two objects hold references to each other.
The Wild Fly application server contains Hibernate Validator out of the box. Size; public class Car package org.hibernate.validator.referenceguide.chapter01; import If you are interested in using Bean Validation for the validation of method pre- and postcondition refer to Declaring and validating method constraints.
In order to update the server modules for Bean Validation API and Hibernate Validator to the latest and greatest, the patch mechanism of Wild Fly can be used. In case your application has specific validation requirements have a look at Creating custom constraints.
Constraints in Bean Validation are expressed via Java annotations.