:moduledeps: core

= Bean Validation Module

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== Overview
The Bean Validation module provides CDI integration for bean validation. It enables the creation of CDI-aware `ConstraintValidator` methods that can use business objects (EJBs, ManagedBeans) to support validation needs.

== Project Setup
The configuration information provided here is for Maven-based projects and it assumes that you have already declared the DeltaSpike version and DeltaSpike Core module for your projects, as detailed in <<configure#, Configure DeltaSpike in Your Projects>>. For Maven-independent projects, see <<configure#config-maven-indep,Configure DeltaSpike in Maven-independent Projects>>.

=== Declare Bean Validation Module Dependencies
Add the Bean Validation module to the list of dependencies in the project `pom.xml` file using this code snippet:

[source,xml]
----
<dependency>
    <groupId>org.apache.deltaspike.modules</groupId>
    <artifactId>deltaspike-bean-validation-module-impl</artifactId>
    <version>${deltaspike.version}</version>
    <scope>runtime</scope>
</dependency>
----

Or if you're using Gradle, add these dependencies to your `build.gradle`:

[source]
----
     runtime 'org.apache.deltaspike.modules:deltaspike-bean-validation-module-impl'
----

== Scoping

A `ConstraintValidator` inherits the scope defined in the bean class.

NOTE: A `ConstraintValidator` may be invoked by multiple threads. For this reason, you should consider using at least `RequestScoped` validators.

== Code Requirements

There are no compile dependencies to use the Bean Validation module. You
simply need to override the factory. Then you can build your `ConstraintValidator` based on CDI programming rules.

.Overriding in Java
[source,java]
-------------------------------------------------------------------------
Validation.byDefaultProvider().configure().constraintValidatorFactory(new CDIAwareConstraintValidatorFactory()).buildValidatorFactory()
-------------------------------------------------------------------------

.Overriding in XML
[source,xml]
--------------------------------------------------------------------------------
<validation-config xmlns="http://jboss.org/xml/ns/javax/validation/configuration"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/configuration">
    <constraint-validator-factory>org.apache.deltaspike.beanvalidation.impl.CDIAwareConstraintValidatorFactory</constraint-validator-factory>
</validation-config>
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