ManyToOne annotation problem

fabreax · **Posted:** Mon Feb 25, 2008 12:24 pm

Hello,

I searched a lot but I don't found the answer. I want to map a bidirectionnal relation.

My 2 classes :

@Entity
public class FichierOriginal
{
...
private List<Action> actions;

@OneToMany( cascade = CascadeType.ALL, mappedBy="fichierOriginal")
public List<Action> getActions() {
return actions;
}

...

}

@Entity
public class Action
{
...
private FichierOriginal fichierOriginal;
...

@ManyToOne
@JoinColumn(name="idFichierOriginal")
public FichierOriginal getFichierOriginal() {
return fichierOriginal;
}

...
}

getActions always returns an empty List and getFichierOriginal is always a null value.

Thank you.

fabreax · **Posted:** Wed Feb 27, 2008 5:52 am

Up ... it's not a common problem ?

sanne.grinovero · **Posted:** Wed Feb 27, 2008 10:13 am

The Entities look like good, can you show some code?

You update both sides of relation in the code?

Code:

fichierOriginal.getActions.add(action);
action.setFichierOriginal(fichierOriginal)

fabreax · **Posted:** Wed Feb 27, 2008 10:32 am

Thank you for your help.

Code:

Transaction tx = session.beginTransaction();

FichierOriginal fichierOriginal = new FichierOriginal("path");
Action action = new Action(TypeAction.CONVERSION);
fichierOriginal.getActions().add(action);
action.setFichierOriginal(fichierOriginal);
   
session.persist(fichierOriginal);

tx.commit();

In a second time, I test the values :

Code:

FichierOriginal fichierOriginal2 = (FichierOriginal) session2.get(FichierOriginal.class,new Integer(1));

System.out.println(fichierOriginal2.getActions());

But it displays [] because the list is empty.

surrizola · **Posted:** Wed Feb 27, 2008 10:57 am

inverse=true in the list is missing

fabreax · **Posted:** Wed Feb 27, 2008 11:13 am

surrizola wrote:

inverse=true in the list is missing

Hello,

Where must I write inverse=true ?

surrizola · **Posted:** Wed Feb 27, 2008 12:51 pm

in the mapping @OneToMany

fabreax · **Posted:** Wed Feb 27, 2008 12:57 pm

surrizola wrote:

in the mapping @OneToMany

@OneToMany( cascade = CascadeType.ALL, mappedBy="fichierOriginal", inverse="true") ?

Is it necessary to update both sides ?

Code:

fichierOriginal.getActions.add(action);
action.setFichierOriginal(fichierOriginal)

andydale · **Posted:** Wed Feb 27, 2008 1:47 pm

inverse is not in annotations, but mappedBy is the same thing

Cheers,

Andy

sanne.grinovero · **Posted:** Wed Feb 27, 2008 6:00 pm

Quote:

Is it necessary to update both sides ?

Yes it is.

You could be in trouble because of the @JoinColumn specification; try commenting that to see if it helps. To specify physical mappings on a bidirectional association you need some special care, you'll find more information on the reference: http://www.hibernate.org/hib_docs/annotations/reference/en/html_single/#d0e1136
in particular at "2.2.5.3.2.1. Bidirectional"

fabreax · **Posted:** Thu Feb 28, 2008 5:03 am

Thank you for your help.

I solved the problem, : I forgot to delete tables between tests :S

Code:

(SchemaExport se = new SchemaExport and se.create(true,true)).

Thanks again