Jackson, Hibernate Validator, and Spring MVC: combining them together

Question

I hope you're fine:

public class UserDTO extends AbstractDTO implements Serializable {

    private static final long serialVersionUID = -2724997313065531109L;

    @NotNull
    @Pattern(regexp = "^[a-zA-Z0-9_\\.]+$")
    @Length(min = 3, max = 30)
    private String userName;

    @NotNull
    @Email
    @Length(min = 3, max = 30)
    private String email;

    @NotNull
    @Length(min = 6, max = 30)
    private String password;

    private String gender;

    @Digits(fraction = 0, integer = 13)
    @Length(min = 8, max = 20)
    private String mobile;

    @Length(min = 6, max = 30)
    private String confirmPassword;

    @NotNull
    @Past
    private Date birthDate;

I'm using Jackson to submit JSON object in Spring MVC, moreover I'm using Hibernate Validator.

For the above DTO, when I'm trying to submit a json object with username length is less than the minimum length in the class @Length(min = 3, max = 30), I got http 400 bad request. Why the annotation of hibernate validation is tightly coupled with Jackson? and How can I get rid of this error?

Thank you in advance :D

Answer 1

In the following link: http://ppettitau.wordpress.com/tag/requestbody/ ,You will find how to combine Hibernate Validator, Jacson, and Spring MVC. The link is providing a complete request life cycle, the client sends request and receive a response in AJAX way. The response contains the error messages that you want to show for the user.