Problemas no relacionamento OneToOne

@Entity(name="Users")
@Table(name = "tbl_users")
public class Users implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id_users")
    private int idUsers;
    
    @Column(name = "login", nullable = false)
    private String login;
    
    @Column(name = "senha", nullable = false)
    private String senha;

    private String nome;
    //private String telefone;
    
    //@OneToOne(cascade = CascadeType.ALL)
    @OneToOne(mappedBy = "user", cascade = CascadeType.ALL)
    private Gerente gerente;

    @OneToOne(cascade = CascadeType.ALL)
    private Caixa caixa;
    
    @OneToOne(cascade = CascadeType.ALL)
    private Frentista frentista;

    public Users() {
    }

@Entity(name="Gerente")
@Table(name = "tbl_gerente")
public class Gerente extends Users implements Serializable {
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id_gerente")
    private int idGerente;

    @OneToOne
    @MapsId
    private Users users;