Trouble with Hibernate entities relation

Question

I have a problem with a relation on Hibernate:

I have two Entities --> Solicitud and DetalleAccesorio, and the relation is:

I have one Solicitud with Many DetalleAccesorio, and I need to save the Solicitud with the DetalleAccesorio, and both are diferents tables on the database.. this is the important code of Solicitud:

@Id @GeneratedValue( strategy=GenerationType.IDENTITY ) @Column( name="num_solicitud" ) private Long numSolicitud;

 @OneToMany( fetch=FetchType.LAZY, mappedBy="codDetalle", cascade={ CascadeType.ALL } )
 private List<DetalleAccesorio> listaAccesorios;     `

What I need to save the same primary key of Solicitud on DetalleAccesorio?

Are you asking what is needed to save the primary key for your Solicitud table? Also, what error are you receiving? — Woot4Moo, Jul 31 '12 at 20:38
set the primary key of DetalleAccesorio with the primary key of Solicitud and save it. — roaro, Jul 31 '12 at 20:43
Ok and what is happening? Is an exception being thrown or is it not persisting? — Woot4Moo, Jul 31 '12 at 20:46
no.. I dont know how to make the relation on the DetalleAccesorio entity with the Solicitud entity. — roaro, Jul 31 '12 at 20:48

score 1 · Answer 1 · edited May 23 '17 at 12:13

1

Basically you have to set the relation in the child entity (DetalleAccesorio) like:

@ManyToOne
Solicitud codDetalle

Take a look to this thread and also this documentation

edited May 23 '17 at 12:13

Community

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answered Aug 01 '12 at 00:16

Pablo Lascano

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score 0 · Answer 2 · answered Aug 01 '12 at 06:17

Remove the mappedBy="codDetalle" from the relation. the mapped by create bidirectional relation . in bidorectional relation the side with mappedby (the onetomany) not control on the relation any more. this is the reason that hibernate dosnt recognize that there is a relation here. If you want to have bidirectional than implement it as it need to be. means both side need to annotate and the important part - you have to maintain the reference in java both ways! look on this.

as you can see there in bidirectional (and i dont think that you need , so remove the mapped by and it will be solved ) you need in code to maintain 2 directions:

Changes made only to the inverse end of the association are not persisted.

score 0 · Answer 3 · answered Aug 01 '12 at 09:35

In fact it has a very simple solution

If you are willing to have access to Solicitud from DetalleAccesorio:
In the DetalleAccesorio class you have to have this:

@ManyToOne(fetch=fetchType.EAGER)
Solicitud codDetalle

It was optional.

(It's not optional) In the Solicitud try this:

@OneToMany(fetch=FetchType.LAZY)
@JoinTable(name = "Solicitud_DetalleAccesorio_MAPPING", joinColumns = @JoinColumn(name = "DetalleAccessorio_ID"), inverseJoinColumns = @JoinColumn(name = "Solicitu_ID"))
List<ManagerDetails> managerDetails;

score 0 · Answer 4 · answered Aug 01 '12 at 13:34

this is the code from the entity DetalleAccesorio

@Id
@Column( name="cod_detalle" )
private Long codDetalle;

@Column( name="cod_accesorio" )
private Integer codAccesorio;

And the id "codDetalle" has to be the same id from Solicitud to save it (numSolicitud)...

Trouble with Hibernate entities relation

4 Answers4