ValidationExceptionHandler.java

package org.jboss.seam.rest.validation;

import javax.enterprise.context.ApplicationScoped;
import javax.validation.ConstraintViolation;
import javax.ws.rs.core.Response.ResponseBuilder;

import static javax.ws.rs.core.Response.Status.BAD_REQUEST;

/**
 * The default handler that converts ValidationException to an HTTP response.
 *
 * @author <a href="http://community.jboss.org/people/jharting">Jozef Hartinger</a>
 */
@ApplicationScoped
public class ValidationExceptionHandler {
    public void handleValidationException(ValidationException exception, ResponseBuilder builder) {
        builder.status(BAD_REQUEST);
        ValidationErrorMessageWrapper error = new ValidationErrorMessageWrapper();

        for (ConstraintViolation<Object> violation : exception.getViolations()) {
            error.addMessage(violation.getMessage());
        }
        builder.entity(error);
    }
}