Error accessing field by reflection for persistent property

I got this error in my sleep mode

Error accessing field [private java.lang.Integer br.com.moldargesso.moldar.entities.Cidade.id] by reflection for persistent property [br.com.moldargesso.moldar.entities.Cidade#id] : 1

      

        
        
        
      

    

Obra class

@Entity
@Table (name = "obras")
public class Obra {


    @Id
    @GeneratedValue (strategy = GenerationType.IDENTITY)
    @Column (name = "id")
    private Integer id;

    @OneToOne 
    @JoinColumn (name = "fk_cliente")
    private Cliente cliente;

    @OneToOne
    @JoinColumn (name = "fk_cidade")
    private Cidade cidade;

      

        
        
        
      

    

CIDADE class

@Entity
@Table (name = "cidade")
public class Cidade {

    @Id
    @GeneratedValue (strategy = GenerationType.IDENTITY)
    @Column
    private Integer id;

    @Column
    private String nome;

      

        
        
        
      

    

DAO

open list of lists (integer cidade) {

    Session session = HibernateUtil.getSessionFactory().openSession();
    Criteria criteria = session.createCriteria(Obra.class);

    if(cidade != null){

        criteria.add(Restrictions.and(
            Restrictions.eq("cidade", cidade)));
    }

    criteria.addOrder(Order.asc("id"));
    List<Obra> obraList = criteria.list();
    session.close();
    return obraList;
}

      

        
        
        
      

    

I do not know how to fix this, I am starting and I would like to fix it. Can anyone help me? Thank.