How to use the Hibernate Validator CDI portable extension

haru · **Joined:** Tue May 03, 2016 8:50 pm **Posts:** 2

I would like to inject my original class to my customizing validator without JavaEE environment. I wrote a code for this considering the following points (#1 and #2) according to your reference guide, but I couldn’t get the instance injection (I got a NullPointerException in the isValid call).
How can I get the injection of UserServiceImpl.class, successfully?
Supposedly, ‘org.hibernate.validator.cdi.HibernateValidator’ should be used in somewhere else in the source code.
If my understanding is correct, please let me know how to use it in my codes.

#1. I added the Maven dependency to my POM as shown in Example1.3 in the reference guide.
#2. I prepared validator class and injection class as follows:

Code:

package xxxxx.constraints.impl;
import javax.inject.Inject;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import xxxxx.constraints.UnusedUserId;
import xxxxx.service.user.UserServiceImpl;

public class UnusedUserIdValidator implements ConstraintValidator<UnusedUserId, String> {
   @Inject
   UserServiceImpl userInformation;

   @Override
   public void initialize(UnusedUserId constraintAnnotation) {
   }

   @Override   
   public boolean isValid(String value, ConstraintValidatorContext context) {
      if (value == null) {
         return true;
      }
      return userInformation.isUnusedUserId(value);
   }
}

Code:

package xxxxx.service.user;

public interface UserService {
   boolean isUnusedUserId(String userId);

   // other methods
}

Code:

package xxxxx.service.user;

import javax.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class UserServiceImpl implements UserService {

   @Override
   public boolean isUnusedUserId(String userId) {
// some logics
   }
}

Gunnar · **Joined:** Sat Jan 24, 2009 12:46 pm **Posts:** 388

How are you obtaining your instance of javax.validation.Validator?

If you get it via dependency injection (@Inject), it should be properly set-up using the InjectingConstraintValidatorFactory. If you bootstrap your own Validator instance using the javax.validation.Validation API (e.g. in order to expose it through a custom producer method), you'd need to set InjectingConstraintValidatorFactory as the constraint validator factory. This factory will perform DI on the constraint validators it instantiates.

Hth,

--Gunnar