How to I get Spring-Data-MongoDB to validate my objects?

Question

I have a very simple Spring Boot application that uses Spring-Data-Mongodb

All I want to do is set a JSR-303 validation rule that says the object I'm saving must have a username. I read that JSR-303 was added to spring-data-mongodb in version 1.1 so I assumed that when I save an object it's validated but this isn't the case.

Does anyone have a simple example setup that shows how this works?

My User pojo looks like

public class User {      @Id     private String id;      @NotNull(message = "User Name is compulsory")     private String userName;     private String password;      public User() {}      public String getId() {       return id;     }     public void setId(String id) {       this.id = id;     }      public String getUserName() {       return userName;     }     public void setUserName(String userName) {       this.userName = userName;     }       public String getPassword() {       return password;     }     public void setPassword(String password) {       this.password = PasswordAuthService.hash(password);     } } 

I saw somewhere that validation only kicks in if you have a validator created in the context so I tried updating my Application class (which contains all the configuration, to look like

@Configuration @ComponentScan @EnableAutoConfiguration public class Application {      @Bean     public Validator getValidator() {       LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();       return validator;     }      public static void main(String[] args) {       SpringApplication.run(Application.class, args);     }  } 

Answer 1

First make sure that you have JSR-303 validator on classpath, for example:

<dependency>     <groupId>org.hibernate</groupId>     <artifactId>hibernate-validator</artifactId>     <version>4.2.0.Final</version> </dependency> 

If you use Java config, the way to go is to create 2 beans:

@Bean public ValidatingMongoEventListener validatingMongoEventListener() {     return new ValidatingMongoEventListener(validator()); }  @Bean public LocalValidatorFactoryBean validator() {     return new LocalValidatorFactoryBean(); } 

Voilà! Validation is working now.