Max,
to isolate the problem, can you see your entities ("GiniChat") in the
DataStore Viewer?
Are you experiencing this problem with the development server or with
the application on app engine?
Rolf
On 1 Aug., 02:22, max <[email protected]> wrote:
> hello,
>
> I'm facing a problem about the persistence of some of my objects.
> i have a class which is persistent capable and i don't think there is any
> error in it
>
> *CODE*
>
> import java.util.ArrayList;
> import java.util.List;
>
> import javax.jdo.annotations.IdGeneratorStrategy;
> import javax.jdo.annotations.PersistenceCapable;
> import javax.jdo.annotations.Persistent;
> import javax.jdo.annotations.PrimaryKey;
>
> import com.google.appengine.api.datastore.Key;
>
> @PersistenceCapable
> public class GiniChat {
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Key key;
> @Persistent
> private String ChatName;
> @Persistent
> private List<String> users;
> public GiniChat (String CN) {
> ChatName = CN;
> users = new ArrayList<String>();}
>
> ....
> */CODE*
> *
> *
> I am creating new persistent objects using this code:
>
> *CODE*
> *
> *
> c_chatName = req.getParameter("chatname");
> GiniChat GC = new GiniChat(c_chatName);
> PersistenceManager pm = PMF.get().getPersistenceManager();
> try {
> pm.makePersistent(GC);
> System.out.println("Success");
> } finally {
> pm.close();
> }
>
> chats.put(c_chatName, GC);
> */CODE*
>
> And I get these objects back in the client side using this code:
>
> *CODE*
>
> PersistenceManager pm = PMF.get().getPersistenceManager();
> String query = "select from " + GiniChat.class.getName();
> List<GiniChat> tmpchats = (List<GiniChat>) pm.newQuery(query).execute();
>
> */CODE*
>
> When i try to add a GiniChat object, it looks like it works but when i
> reload the client (which is supposed to get these objects back), i don't get
> anything back from the datastore, except objects that i previously created,
> using the same class but with different attributes (actually i just added
> the users' list). All newly created objects seem not to be persistent, or a
> least not in this class. Is it possible that because i changed the structure
> of my class, it is now stored somewhere else ?
>
> summary:
> -when i try to add an object, it seems to work
> -but when i try to get it back from the datastore, it fails
> -it was ok before
> -not anymore since i changed the structure of my class
>
> Thank you for your help
>
> Max
>
> PS: sorry for my english
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