Robert Greathouse Robert Greathouse - 1 month ago 21
Java Question

Spring-Data-Rest Validator

I have been trying to add spring validators to a spring-data-rest project.

I followed along and setup the "getting started" application via this link: http://spring.io/guides/gs/accessing-data-rest/

...and now I am trying to add a custom PeopleValidator by following the documents here:
http://docs.spring.io/spring-data/rest/docs/2.1.0.RELEASE/reference/html/validation-chapter.html

My custom PeopleValidator looks like

package hello;

import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

public class PeopleValidator implements Validator {
@Override
public boolean supports(Class<?> clazz) {
return true;
}

@Override
public void validate(Object target, Errors errors) {
errors.reject("DIE");
}
}


...and my Application.java class now looks like this

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration;

@Configuration
@EnableJpaRepositories
@Import(RepositoryRestMvcConfiguration.class)
@EnableAutoConfiguration
public class Application {

public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}

@Bean
public PeopleValidator beforeCreatePeopleValidator() {
return new PeopleValidator();
}
}


I would expect that POSTing to the
http://localhost:8080/people
URL would result in an error of some kind since the PeopleValidator is rejecting everything. However, no error is thrown, and the validator is never called.

I have also tried manually setting up the validator as shown in section 5.1 of the spring-data-rest documentation.

What am I missing?

Answer

So it appears that the before/after "save" events only fire on PUT and PATCH. When POSTing, the before/after "create" events fire.

I tried it the manual way again using the configureValidatingRepositoryEventListener override and it worked. I'm not sure what I'm doing differently at work than here at home. I'll have to look tomorrow.

I sure would love to hear if others have suggestions on why it wouldn't work.

For the record, here is what the new Application.java class looks like.

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.rest.core.event.ValidatingRepositoryEventListener;
import org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration;

@Configuration
@EnableJpaRepositories
@Import(RepositoryRestMvcConfiguration.class)
@EnableAutoConfiguration
public class Application extends RepositoryRestMvcConfiguration {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    protected void configureValidatingRepositoryEventListener(ValidatingRepositoryEventListener validatingListener) {
        validatingListener.addValidator("beforeCreate", new PeopleValidator());
    }
}