Spring MVC: Designing Real-World Web Applications

Validation

We wouldn't want our user to enter invalid or empty information and that's why we will need to add some validation logic to our ProfileForm.

package masterspringmvc4.profile;

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotEmpty;

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Past;
import javax.validation.constraints.Size;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class ProfileForm {
    @Size(min = 2)
    private String twitterHandle;

    @Email
    @NotEmpty
    private String email;

   @NotNull
    private Date birthDate;

    @NotEmpty
    private List<String> tastes = new ArrayList<>();
}

As you can see, we added a few validation constraints. These ...