How to register a custom constraint validator

Question

My email string field is annotated with javax.validation.constraints.Email :

import javax.validation.constraints.Email;

public class MyModel {

  @Email
  private String email;
}

Currently hibernate-validator's org.hibernate.validator.internal.constraintvalidators.AbstractEmailValidator automatically validates it when the corresponding api endpoint is called:

@Controller("/v1")
@Validated
public class MyController {
  ...

  @Put(uri = "/{id}")
  @Produces("application/json")
  public IdType updateEntity(@Valid MyModel model) {
    return delegate.updateEntity(model);
  }
}

How can I register my custom class to validate the email field with Micronaut's validator, while still using the original javax.validation.constraints.Email annotation?

This is what my custom constraint validator looks like:

import javax.inject.Singleton;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Email;

@Singleton
public class EmailValidator implements ConstraintValidator<Email, String> {

  @Override
  public void initialize(Email constraintAnnotation) {}

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

Micronaut version: 1.1.4

Answer 1

It seems that what you are looking for is this:

HibernateValidatorConfiguration configuration = Validation
    .byProvider( HibernateValidator.class )
    .configure();

ConstraintMapping constraintMapping = configuration.createConstraintMapping();

constraintMapping
        .constraintDefinition( Email.class )
        .includeExistingValidators( false )
        .validatedBy( MyEmailValidator.class );

configuration.addMapping( constraintMapping );

That's a programmatic way of "replacing" the existing validator for existing constraint. For more details on this check this part of the doc

Answer 2

Change your validator from @Email to @MailAdress or any non-standard annotation. Everyone expects @Email as an import from Javax / Hibernate.

If you want to add a behaviour you may also check @Pattern (as dot is not checked in @Email annotation)