No error message from Validator in spring-data-rest - spring-data

Question

Following the documentation http://docs.spring.io/spring-data/rest/docs/2.4.2.RELEASE/reference/html/#validation I set up a very simple Validator for a spring-data-rest repository invocation:
public class DealValidator implements Validator {
#Override
public boolean supports(Class<?> aClass) {
return Deal.class.isAssignableFrom(aClass);
}
#Override
public void validate(Object o, Errors errors) {
errors.reject("deal.error", "No deal");
}
}
And this is the configuration
#Override
protected void configureValidatingRepositoryEventListener(ValidatingRepositoryEventListener validatingListener) {
validatingListener.addValidator("beforeCreate", new DealValidator());
}
#Configuration
static class I18nConfiguration {
#Bean
public ResourceBundleMessageSource messageSource() {
ResourceBundleMessageSource source = new ResourceBundleMessageSource();
source.setBasename("classpath:messages");
return source;
}
}
The configuration seems to be alright, the validator is called correctly, the http-request yields an error response, but no error text is returned, neither from the messages.properties nor the default text. Is this a bug?

Answer 1

I came across the same issue. Only validation errors that reference a field are serialized by spring-data-rest.
So you could use rejectValue(String field, String errorCode, String defaultMessage) instead of reject
See org.springframework.data.rest.webmvc.support.RepositoryConstraintViolationExceptionMessage for implementation details. The implementation just processes org.springframework.validation.Errors#getFieldErrors().