Hi Alex,
This is a known issue. Check out this thread for discussion +
workarounds:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/3affdf1441f864b6
Marc
On Feb 12, 3:55 am, Alexander Arendar <alexander.aren...@gmail.com>
wrote:
> Hi guys,
>
> yesterday I was trying to model a simple forum comments. Just a
> comments which you can add more comments to.
> So, the approximation of the entity is like this:
> -------------------------------------------------------------------
> @PersistenceCapable (detachable = "true", identityType =
> IdentityType.APPLICATION)
> public class CommentEntity {
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Key key;
>
> @Persistent
> private String category;
>
> @Persistent
> private String commentDate;
>
> @Persistent
> private String userName;
>
> @Persistent
> private String commentBody;
>
> @Persistent
> private List<CommentEntity> children = new
> ArrayList<CommentEntity>();
>
> getters/setters/etc.
>
> }
>
> DataNucleus enhancement goes ok, no errors in the console.
> Call of the pm.makePersistent() goes without any exceptions for such
> entity.
> BUT IT IS NOT PERSISTED.
>
> I found out that problem is in "children" property. And the problem is
> it's a list of objects of the same class as the parent entity. If I
> comment that property declaration the entity is persisted. Also if I
> change the type of the child entities to some new class (not extending
> the CommentEntity) it also gets persisted.
>
> So my suspicion is that JDO (or GAE JDO impl) does not allow child
> entities to be of the same class. Is it correct? Maybe I'm missing
> something essential? Please advice.
>
> Sincerely,
> Alex
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