GWT validation (JSR 303) SampleValidatorFactory - gwt

Question

I try to use bean validation in GWT. I follow this guide :
https://developers.google.com/web-toolkit/doc/latest/DevGuideValidation
At compile time, I have the following error :
ERROR: Could not load deferred binding result type 'com.google.gwt.sample.validation.client.SampleValidatorFactory'
I can make it working if I include this dependency:
<dependency>
<groupId>com.googlecode.gwt-validation</groupId>
<artifactId>gwt-validation</artifactId>
<version>2.1</version>
</dependency>
But I find it weird because this dependency is not mentionned in the guide.
Question : As GWT 2.5 is supposed to support bean validation, why do I need this additional library? What am I doing wrong?
I am using GWT 2.5.0
My pom.xml contains the following dependencies :
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.3.1.Final</version>
<type>jar</type>
<classifier>sources</classifier>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.3.1.Final</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<type>jar</type>
<classifier>sources</classifier>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<type>jar</type>
</dependency>
and my gwt.xml contains the following lines :
<inherits name="org.hibernate.validator.HibernateValidator" />
<replace-with
class="com.google.gwt.sample.validation.client.SampleValidatorFactory">
<when-type-is class="javax.validation.ValidatorFactory" />
</replace-with>
In the code, I get the Validator in this way :
import javax.validation.Validator;
...
private static final Validator VALIDATOR= Validation.buildDefaultValidatorFactory().getValidator();

Answer 1

You are mixing a third party library gwt-validation with Native GWT Validation.
The gwt-validation is not from official gwt team or google. You should not be using following in your pom if you intend to stick to native gwt validation support.
<dependency>
<groupId>com.googlecode.gwt-validation</groupId>
<artifactId>gwt-validation</artifactId>
<version>2.1</version>
</dependency>
Also note that you have native gwt hibernate validator support upto 4.1.0 only. GWT Sample usage. GWT native hibernate validator source code.
And you can include it as
<!-- Hibernate bean validation binary for the server -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.1.0.Final</version>
<exclusions>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Hibernate bean validation source for the GWT client -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.1.0.Final</version>
<classifier>sources</classifier>
<exclusions>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Required by Hibernate validator because slf4j-log4j is
optional in the hibernate-validator POM
-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.1</version>
</dependency>