@Entity
@Table(name="allowed_user")
public class AllowedUser implements Serializable
{
    private static final long serialVersionUID = 1L;

    @Id
    private BigInteger id;

    @OneToOne @MapsId
    private User user;

    public AllowedUser()
    {

    }

    public BigInteger getId()
    {
        return this.id;
    }

    public void setId(final BigInteger id)
    {
        this.id = id;
    }

    public User getUser()
    {
        return this.user;
    }

    public void setUser(final User user)
    {
        this.user = user;
    }
}