Modelo não restringiu html

Meu modelo não está obrigando o preenchimento de campos no meu html. Alguém ve o que ha?

@(form: DynamicForm)

@import b3.vertical.fieldConstructor

@main("Welcome to Play") {


<!-- cadastro de usuario -->
    @b3.form(routes.MainController.addNewUser){
        <h1>Cadastrar novo usuario</h1>
        @b3.text(form("name"), '_label -> "nome")
        @b3.email(form("email") , '_label -> "Email")
        @b3.password(form("password") , '_label -> "Senha")
        @b3.submit('class -> "btn btn-primary"){cadastrar}  

    }
}

package models;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

import com.avaje.ebean.Model;

import play.data.validation.Constraints.Required;

@Entity
public class User extends Model{

    @Id @GeneratedValue
    private int id;

    @Required (message = "campo obrigatorio")
    private String name;

    @Required (message = "campo obrigatorio")
    private String email;

    @Required (message = "campo obrigatorio")
    private String password;

    public int getId() {
        return this.id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @Override
    public String toString() {
        return "User [name=" + name + ", email=" + email + ", password=" + password + "]";
    }




}