Hibernate Session Saving same object twice

Question

Hello Every time I try to save an object in Hibernate , it is saving twice can anyone help me.

Note: The below log messages are displayed after session.saveOrUpdate(register); line

My Code is

Session session = null;
        Transaction transaction = null;
        try {
            session = this.sessionFactory.getCurrentSession();
            transaction = session.beginTransaction();
            session.saveOrUpdate(register);
            transaction.commit();
            session.close();
            return true;
        } catch (HibernateException ex) {
            transaction.rollback();
        }

My log is

Hibernate: insert into UserRegister (address1, address2, bloodGroup, addressCity, dateOfBirth, firstName, gender, lastName, password, phoneNumber, addressState, userEmail, userName, addresszipCode) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)

Hibernate: insert into UserRegister (address1, address2, bloodGroup, addressCity, dateOfBirth, firstName, gender, lastName, password, phoneNumber, addressState, userEmail, userName, addresszipCode) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)

My entity is

@Entity
@Table(name = "UserRegister", uniqueConstraints = {
@UniqueConstraint(columnNames = {"id"})})
public class User implements Serializable {

    private static final long serialVersionUID = -77886191777123344L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", nullable = false, unique = true, length = 11)
    private int userID;

    @Column(name = "firstName", nullable = false)
    private String firstName;

    @Column(name = "lastName", nullable = false)
    private String lastName;

    @Column(name = "userName", nullable = false)
    private String userName;

    @Column(name = "password", nullable = false)
    private String password;

    @Column(name = "gender", nullable = false)
    private String gender;

    @Column(name = "dateOfBirth", nullable = false)
    private Timestamp dateOfBirth;

    @Column(name = "bloodGroup", nullable = true)
    private String bloodGroup;

    @Column(name = "userEmail", nullable = false)
    private String userEmail;

    @Column(name = "phoneNumber", nullable = false)
    private String phoneNumber;

    @Column(name = "address1", nullable = false)
    private String address1;

    @Column(name = "address2")
    private String address2;

    @Column(name = "addressCity")
    private String city;

    @Column(name = "addressState")
    private String state;

    @Column(name = "addresszipCode")
    private String zipCode;

    @OneToMany(cascade = CascadeType.ALL)
    @JoinColumn(name="userID")
    private List<UserMessages> userMessages;

My UserMessages Entity is

@Entity
@Table(name = "UserMessages", uniqueConstraints = {
    @UniqueConstraint(columnNames = {"id"})})
public class UserMessages implements Serializable {
    private static final long serialVersionUID = -77886191777123344L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", nullable = false, unique = true, length = 11)
    private int messageID;

    @Column(name = "fromName", nullable = false)
    private String fromName;

    @Column(name = "message", nullable = false)
    private String message;

    @Column(name = "messageTime", nullable = false)
    private Timestamp messageTime;

    @Column(name = "fromPhoneNumber", nullable = false)
    private String fromPhoneNumber;

    @ManyToOne
    @JoinColumn(name="userID", insertable=false, updatable=false)
    private User user;