Spring data rest - Handle entity validation

Question

This is the Code

Person.java

@Entity
class Person {
   @Id private Long Id;
   @NotNull private String name;
   //getter setters
}

PersonRepository.java

@RepositoryRestResource(collectionResourceRel = "person", path="person" )
interface PersonRepository extends CrudRepository<Person,Long>{
}

Now, when I send null against name attribute , the validator validates it correctly, but the actual exception that is getting thrown is TransactionRollbackExecption.

Like this

{
    "timestamp": "2018-03-14T09:01:08.533+0000",
    "status": 500,
    "error": "Internal Server Error",
    "message": "Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction",
    "path": "/peron"
}

How do I get the actual ConstraintViolation exception. I do see the exception in logs. But its not getting thrown.

Cepr0 · Accepted Answer · 2018-03-14 09:26:26Z

1

You can add LocalValidatorFactoryBean to ValidatingRepositoryEventListener when configuring RepositoryRestConfigurerAdapter, like this:

@Configuration
public class RepoRestConfig extends RepositoryRestConfigurerAdapter {

    private final LocalValidatorFactoryBean beanValidator;

    public RepoRestConfig(LocalValidatorFactoryBean beanValidator) {
        this.beanValidator = beanValidator;
    }

    @Override
    public void configureValidatingRepositoryEventListener(ValidatingRepositoryEventListener v) {
        v.addValidator("beforeCreate", beanValidator);
        v.addValidator("beforeSave", beanValidator);
        super.configureValidatingRepositoryEventListener(v);
    }
}

answered Mar 14, 2018 at 9:26

Cepr0

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2 Comments

hovanessyan Over a year ago

using the handler is a slightly more convenient way, as it lets you work with the object in a type-safe way (e.g. Person, not Object - which is the case when using Validator).

Cepr0 Over a year ago

@hovanessyan the question was about 'how to get ConstraintViolation' not about 'how to validate my entity'...

hovanessyan · Accepted Answer · 2018-03-14 09:29:11Z

1

The reason for this is that Spring's TransactionInterceptor is overriding your exception.

The idiomatic way of implementing repository entity validation, according to Spring's documentation, is to use Spring Data Rest Events. You probably want to use BeforeSaveEvent or BeforeCreateEvent.

You can create a custom type-safe handler for entities (see the provided link for details), which looks similar to:

@RepositoryEventHandler 
public class PersonEventHandler {

  @HandleBeforeSave
  public void handlePersonSave(Person p) {
    // … you can now deal with Person in a type-safe way
  }
}

Another approach is to register a Repository Listener which extends AbstractRepositoryEventListener, also described in the documentation.

edited Mar 14, 2018 at 9:29

answered Mar 14, 2018 at 9:22

hovanessyan

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1 Comment

madhairsilence Over a year ago

Thanks. but I was looking for something generic. Above answer solves it

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