if you want search by value of new property you must resave each
object with new schema.
On 26 апр, 17:10, Matthias Koch <umbella....@googlemail.com> wrote:
> Hi,
> I'm new to appengine.
> and have the first problem hopefully someone can help me.
>
> I have just a simple Entiy class like this:
>
> @Entity
> public class GuestbookEntry {
>
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private Key key;
> private String username;
> private String message;
> ......
>
> }
>
> this class will be persisted with jpa.
>
> this works fine so far.
> but know I will update this class and add a new field:
>
> private long time;
>
> when I now start the app and will get the data that is allready stored
> I allways get this error:
>
> java.lang.NullPointerException: Datastore entity with kind
> GuestbookEntry and key GuestbookEntry(1) has a null property named
> time. This property is mapped to
> net.umbella.appengine.services.guestbook.model.GuestbookEntry.time,
> which cannot accept null values
>
> normaly I would update the db schema by myself, andi can add a default
> value 0 to all existing entry.
>
> but how do I solve this problem on appengine ?
>
> thanks
>
> kindest regards
> Matthias
>
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