PersistenceException aufgetreten : org.hibernate.Ausnahme.ConstraintViolationException: could not insert: [- Modelle.Benutzer]

Habe ich diese Ausnahme!!
hier ist mein model-Klasse

@Entity
public class User extends Model {

    @OneToMany(mappedBy="email", cascade=CascadeType.ALL)
    public List<Photo> photo;

    @Email
    @Required
    @Unique
    public String email;

    @Required
    public String passwordHash;

    @Required
    public String education;

    @Required
    public String fname;

    @Required
    public String lname;

    @Required
    public Date dob;

    @Required
    public String gender;

    @Required
    public String country;

    @Required
    public Long phone;

    @Required
    public String status;

    @Required
    public String jobtitle;

    @Required
    public String company;

    @Required
    public String industry;

    @Required
    public Date addDate;

    public String needConfirmation;

public User(String email, String password, String fname,
                String lname, Date dob, String gender, String country,
                Long phone, String status, String education, String jobtitle, String company, String industry) {
        //all initialization here
    }
}

können Sie mir bitte sagen, wohin ich gehe falsch
playframework× 2289

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this is my photo class, and please tell me how can I allow JPA to generate my database


/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package models;

import controllers.Users;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import play.db.jpa.Model;

/**
 *
 * @author nPandey
 */
@Entity
public class Photo extends Model{

    public String photoname;

    @ManyToOne
    public User email;

    public String owner;

    public Photo(){

    }

    public Photo(User email, String photo){
        this.photoname=photo;
        this.email=email;
        this.owner=email.email;
    }

}