How can I tell Hibernate Validator to throw exception if the incoming request has less or extra fields than the POJO

Question

For example my POJO has two field

public class User {
    @NotNull
    private String firstName;
    @NotNull
    private String lastName;
}

if the incoming request body is like the following, the hibernate won't throw any error, since all required field is there.

{
  "firstName": "cat",
  "lastName": "dog",
  "extraField": "whatever"
}

Is there any way I can tell hibernate to check this kind of scenario? I know I can just @JsonCreator to do the trick. But is it the good approach to combine both hibernate and Jackson together?

Answer 1

If you are using auto configuration then the following property in application.properties will do the trick.

spring.jackson.deserialization.fail-on-unknown-properties=true

This is equivalent to the following

objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true);

I did a small test without spring and it throws an exception com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException