Problems declaring a foreign key using Ibernate

Question

Hello.I need help declaring a foreign key using Hibernate in a project with JSF, I consulted several websites and handouts and could not find a solution. Where I have the classes already mapped calendar and dates, where a calendar contains several dates and dates contain a calendar.

Below is the code used:

Calendar class

@Id
@Column(name = "calendario_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private int calendario_id;

@Column(name = "ano")
private int ano;

@OneToMany(mappedBy = "calendarioDatas")
@Cascade(org.hibernate.annotations.CascadeType.ALL)
private List<Datas> datasCalendario = new ArrayList<>();

Class dates

@Id
@Column(name = "data_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private int data_id;

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

@Column(name = "data")
private Date data;

@ManyToOne
@JoinColumn(name="calendarioDatas", nullable = false)
@org.hibernate.annotations.ForeignKey(name = "calendarioDatas_fk")
private Calendario calendarioDatas = new Calendario();

Class where you have the method to register the dates after being selected

public void commitBancoDeDados(){
   hibernateUtil.cadastrar(calendario); 
   hibernateUtil.atualizar(datas);
}

HibernateUtil.register makes the persistence of the calendar class, whereas hibernateUtil.update merges the dates class.

Answer 1

I did this example showing how you should do to associate the entities in question.

public class Teste {

    public static void main(String[] args) {
        Calendario calendario = new Calendario();
        calendario.setId(1L);

        Datas datas = new Datas();
        datas.setId(1L);

        // método que salva o calendario
        // hibernateUtil.cadastrar(calendario);

        // depois do calendario esta salvo , você relaciona a data a ele.
        datas.setCalendario(calendario);

         // método que salva a data.
        // hibernateUtil.cadastrar(data);

    }

}

class Calendario {
    private Long id;

    public Long getId() {
        return id;
    }

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

class Datas {
    private Long id;

    private Calendario calendario;

    public Long getId() {
        return id;
    }

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

    public Calendario getCalendario() {
        return calendario;
    }

    public void setCalendario(Calendario calendario) {
        this.calendario = calendario;
    }
}