RE: [flexcoders] LCDS : Managed Associations - Null identity map for destination

[Jeff Vroom]

That error should definitely not be happening in this situation.     Can you 
send the client and server debug logs for this case?     You might try a 
different mode for your association (i.e. the room.users many-to-many tag)... 
if it is load-on-demand=true or using paging, try turning that off.  If it does 
not have lazy=true, you might try adding that attribute.

Jeff

From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On Behalf 
Of Besite - Bart
Sent: Monday, January 26, 2009 1:19 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] LCDS : Managed Associations - Null identity map for 
destination


Hello,

I have a managed assocation between two objects.  I have rooms and users. There 
is a one-to-many relationship between rooms and users.

When a user wants to join a Room, he first requests the Room-object using 
getItem() :

            public function joinRoom(roomId:int):void
            {
                var responder:mx.rpc.Responder = new 
mx.rpc.Responder(resultHandler, faultHandler)
                itemRef = ds.getItem({roomId:roomId});
                itemRef.addResponder(responder);
            }

Then in the responder method, I add a new User-object to the the 
arrayCollection users within the Room-object.
I don't give this new user an id, because the id is generated on the server :

            private function resultHandler(event:ResultEvent):void
            {
                var room:Room = event.result as Room;

                var user:User = new User();
                user.roomId = room.id;
                user.name = this.nickName;

                room.users.addItem(user);
                ds.commit();
             }

This results in the following error server side :

Null identity map for destination: user:java.lang.Throwable
        at flex.data.ItemIdentity.toItemIdentity(ItemIdentity.java:128)
        at flex.data.SequenceManager.toItemIdentity(SequenceManager.java:3916)
        at flex.data.SequenceManager.toItemIdentities(SequenceManager.java:3930)
        at flex.data.SequenceManager.getDSidsHeader(SequenceManager.java:1088)
        at 
flex.data.SequenceManager.getSequencedMessage(SequenceManager.java:1663)
        at 
flex.data.SequenceManager.getPageFromSequence(SequenceManager.java:1028)
        at flex.data.DataService.serviceMessage(DataService.java:458)
        at 
flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1495)
        at 
flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:882)
        at 
flex.messaging.endpoints.RTMPConnection.handleTCCommand(RTMPConnection.java:722)
        at 
flex.messaging.endpoints.RTMPConnection.serviceTCMessage(RTMPConnection.java:1021)
        at 
flex.messaging.endpoints.RTMPConnection.doRead(RTMPConnection.java:514)
        at 
flex.messaging.endpoints.RTMPProtocolHandler.doRead(RTMPProtocolHandler.java:123)
        at 
flex.messaging.socketserver.Connection$ConnectionReader.run(Connection.java:778)
        at 
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
        at 
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
        at java.lang.Thread.run(Thread.java:619)

How can I prevent this error ? In the data-management-config.xml the 
user-destination has the following identity property : <identity property="id" 
undefined-value="0"/>

PS. Earlier in my application I added a new user-object to a newly created Room 
and I didn't get this error

Kind regards,
Bart

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