I have two objects (noticia and noticia_lang). noticia_lang is a collection used by noticia.

I am trying to create a new noticia and add two noticia_lang objects to noticia. When i persist noticia i get an error saying that id_noticia cannot be null. Mening that the noticia_lang foreign key is not being generated for me??

Here are my beans with annotations:

public class Noticia implements Serializable {

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

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

@OneToMany(cascade = CascadeType.ALL, mappedBy = "idNoticia")
private Collection<NoticiaLang> noticiaLangCollection= new ArrayList();
--------------------------

public class NoticiaLang implements Serializable {

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

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

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

@JoinColumn(name = "codigo_language", referencedColumnName = "code")
@ManyToOne
private Language codigoLanguage;

@JoinColumn(name = "id_noticia", referencedColumnName = "id")
@ManyToOne
private Noticia idNoticia;
---------------------------

here is my code:

EntityManager emMySQL = HibernateUtil.getEntityManagerFactory().createEntityManager();


emMySQL.getTransaction().begin();

Noticia noticia = new Noticia();
noticia.setImage("test");

NoticiaLang language = new NoticiaLang("test1", "testdesc");
language.setCodigoLanguage(new Language("es","lalalalal"));
NoticiaLang language2 = new NoticiaLang("test1", "testdesc");
language2.setCodigoLanguage(new Language("es","lalalalal"));
noticia.getNoticiaLangCollection().add(language);
noticia.getNoticiaLangCollection().add(language2);

emMySQL.persist(noticia);

emMySQL.getTransaction().commit();
emMySQL.close();

any ideas??

Ok i got it. I just read the part about bidirectional relation and owners.

Hi,

I think it might be becuase NoticiaLang is the owning side of the relationship, and as such it is the only entity that can update the relationship in the DB.

Cheers,

Andy

Yes that was the problem