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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