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My first OneToMany link ?

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Louevie

Post subject: My first OneToMany link ?

Posted: Mon Feb 09, 2009 7:08 am

Beginner

Joined: Wed Jan 28, 2009 10:16 am
Posts: 37

Hello,

I try my first oneToMany link with this documentation, but the sample does not work ?

http://www.hibernate.org/hib_docs/annot ... ntity.html

I have juste a Person entity and I would like to join a lot a phone like this :

Code:

@Entity
class Person {

@Id
private int id;
...
@OneToMany(mappedBy="num")
   private List<Phone> phones;

..



@Entity
class Phone {
@Id
private String num;
...

I travel a lot of website but no one says the same thing ??

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ethnarch

Post subject:

Posted: Mon Feb 09, 2009 1:11 pm

Senior

Joined: Tue Aug 01, 2006 9:24 pm
Posts: 120

try adding the targetEntity

Code:

OneToMany(mappedBy="num" targetEntity="yourpackage.Phone.class"))

Also try specifying the table you are mapping to

Code:

@Entity
@Table (name="BR_RULE")

And finally other people might disagree but I usually instantiate all my collections. This way I don't have to deal with nulls later on.

Code:

@OneToMany(mappedBy="num" targetEntity="yourpackage.Phone.class"))
   private List<Phone> phones = new ArrayList<Phone>(); 

Are you receiving any exceptions if so please post the stack trace.

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