Pfthb

I am having trouble dealing with @OneToMany relationship.

Here is my code :

@Entity
@Table(name = "type_mouvement")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class TypeMouvement implements Serializable 

 private static final long serialVersionUID = 1L;

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private Long id;

 @OneToMany(mappedBy="typeMouvement", fetch = FetchType.EAGER,cascade = CascadeType.PERSIST)
 private List<CompteTypeMouvement> comptes;
...


@Entity
@Table(name = "type_mouvement_comptes")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class CompteTypeMouvement implements Serializable 
 private static final long serialVersionUID = 1L;

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private Long id;

 private String numCompte;

 @ManyToOne
 private TypeMouvement typeMouvement;
...

How I use these entities :

TypeMouvement typeMouvementFromDB = typeMouvementRepository.findOne(new Long(1));
CompteTypeMouvement compte = new CompteTypeMouvement();
compte.setNumCompte("123");
compte.setTypeMouvement(typeMouvementFromDB);
typeMouvementFromDB.getComptes().add(compte);
typeMouvementRepository.save(typeMouvementFromDB);

The result I get :

I thought I would get :

Why are the properties of CompteTypeMouvement not filled when I save TypeMouvement?

You are trying to invoke save passing an already existing entity:

TypeMouvement typeMouvementFromDB = typeMouvementRepository.findOne(new Long(1));
typeMouvementRepository.save(typeMouvementFromDB);

The relationship has a persist cascade type only though:

@OneToMany(mappedBy="typeMouvement", fetch = FetchType.EAGER,cascade = CascadeType.PERSIST)
private List<CompteTypeMouvement> comptes;

The save impl is a follows (spring-data-jpa-1.11.3):

public <S extends T> S save(S entity) 

 if (entityInformation.isNew(entity)) 
 em.persist(entity);
 return entity;
 else 
 return em.merge(entity);
 

Which means that a merge instead of a persist will be invoked.

This if you add merge to cascade it should work:

@OneToMany(mappedBy="typeMouvement", fetch = FetchType.EAGER,
 cascade = CascadeType.PERSIST, CascadeType.MERGE)
private List<CompteTypeMouvement> comptes;