Hibernate Validator 4.0.2 with Hibernate Entity Manager 3.4

agoncal · **Joined:** Sun Aug 06, 2006 8:54 am **Posts:** 15

Hi,

We want to use Bean Validation annotations (package javax.validation.constraints) instead of Hibernate Validator specific ones. Because of incompatibility reasons, we will not be able to migrate to Hibernate 3.5 (JPA 2.0) and thus cannot use the automatic validation between JPA 2.0 and Bean Validation 1.0.

How do we validate entities with Hibernate Validator 4.0.2 with Hibernate Entity Manager 3.4 ? At the moment, nothing is triggered when the persist is done (no constraint violation is thrown). We've tried using @EntityListeners(JPAValidateListener.class) from the hibernate-validator-legacy artifact on each entities, but it doesn't work either.

Any idea ?
Thanks,
Antonio

hardy.ferentschik · **Posted:** Thu Feb 18, 2010 2:23 pm

Write your own BeanValidationEventListener and register it as listener in Hibernate. The code this this is pretty much identical to what we do in the latest Hibernate release. It is really independent of JPA2.

Have a look at this thread - viewtopic.php?f=9&t=999747&start=15

--Hardy

agoncal · **Joined:** Sun Aug 06, 2006 8:54 am **Posts:** 15

Hi,

Thanks for the information. I had a look at all that, but unfortunately, it doesn't work. I've tried just to validate by hand as follow :

Code:

Country country = new Country(null, null);
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<Country>> violations = validator.validate(country);
assertTrue(violations.size() == 1);

The problem is that validation uses the JPATraversableResolver class which uses the Persistence.getPersistenceUtil() method. This method is in JPA 2.0, not in JPA 1.0.

I've tried to get a different TraversableResolver (I thought mayby DefaultTraversableResolver could work) by doing :

Code:

TraversableResolver tr = new DefaultTraversableResolver();
validator = Validation.buildDefaultValidatorFactory().usingContext().traversableResolver(tr).getValidator();

But it still gets the JPATraversableResolver. Any idea ?

Thanks,
Antonio

emmanuel · **Posted:** Fri Feb 19, 2010 6:23 am

Write a TraversableResolver that uses Hibernate.isInitialized instead of the JPA 2 equivalent.

emmanuel · **Posted:** Fri Feb 19, 2010 6:39 am

agoncal wrote:

Code:

TraversableResolver tr = new DefaultTraversableResolver();
validator = Validation.buildDefaultValidatorFactory().usingContext().traversableResolver(tr).getValidator();

But it still gets the JPATraversableResolver. Any idea ?

DefaultTraversableResolver tries to detect JPA and use the JPAAwareTR if Persistence is found in the classpath. But writing your own TR should work.

agoncal · **Joined:** Sun Aug 06, 2006 8:54 am **Posts:** 15

Brilliant, it works. This is what I've done :

Code:

import org.hibernate.Hibernate;

import javax.validation.Path;
import javax.validation.TraversableResolver;
import java.lang.annotation.ElementType;

public class JPATraversableResolver implements TraversableResolver {

    public boolean isReachable(Object traversableObject, Path.Node traversableProperty, Class<?> rootBeanType, Path pathToTraversableObject, ElementType elementType) {
        return traversableObject == null || Hibernate.isInitialized(traversableObject);
    }

    public boolean isCascadable(Object traversableObject, Path.Node traversableProperty, Class<?> rootBeanType, Path pathToTraversableObject, ElementType elementType) {
        return true;
    }
}

Then I use my own JPATraversableResolver as follow :

Code:

TraversableResolver tr = new JPATraversableResolver();
Validator validator = Validation.buildDefaultValidatorFactory().usingContext().traversableResolver(tr).getValidator();

Country country = new Country(null, null);
Set<ConstraintViolation<Country>> violations = validator.validate(country);
assertEquals("Should have 2 constraints violation", 2, violations.size());

Good, now just need to code all that in an entity listener and trigger it at @PrePersist and @PreUpdate.

Thanks Emmanuel
Antonio