Probably you did not retrieve the Key of the stored object correctly,
or the error/bug is while storing the object.
I do the same - convert Key to Long or String when storing
relationship between entities, but I never got 0 as the generated Key.
Vaclav
On Feb 17, 12:15 am, Clint <clintandrewh...@gmail.com> wrote:
> I'm not sure what I'm doing wrong here.
>
> I'm persisting an object with a key created using a unique string, in
> this case the user id. However, to make things more URI friendly, I'm
> using the Key.getId() of these objects to serve as a unique id (uid).
>
> The first entity I save has key.getId() == 0. When I later attempt to
> recover this entity, using a Key created by KeyFactory:
>
> // Key ID for the object being retrieved is 0.
> AuthorDO.uidToKey("0");
>
> public static Key uidToKey(String uid) {
> long keyId = Long.parseLong(uid);
> return KeyFactory.createKey(AuthorDO.class.getSimpleName(),
> keyId);
> }
>
> I get an illegal argument exception:
>
> java.lang.IllegalArgumentException: id cannot be zero
> at
> com.google.appengine.api.datastore.KeyFactory.createKey(KeyFactory.java:
> 44
> at
> com.google.appengine.api.datastore.KeyFactory.createKey(KeyFactory.java:
> 31)
> at com.sageek.quotebook.data.dao.jdo.AuthorDO.uidToKey(AuthorDO.java:
> 214)
>
> The id is 0, according to the key that was created by the datastore.
> Where is this error coming from? What am I doing wrong?
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