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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