How can I use a Java INTERFACE argument for Remote
Client<-->

Dear IBM Websphere Forum,

perhaps you can help me with my problem.
I use Websphere 6.1 and the related Application Client.
I use JRE-1.5 

Communication between J2EE-Client side and J2EE-Server side seems to work.

I seem have to have a problem with serialization of an argument,
wich is a plain interface.
 

What has to be done different?

Yours,

            Frank




 

I use this Interface to communicate between Client and Server.
The Client creates an instance iof this interface ....
-----------------------------------------------------------------------
public interface ChatRoomListener extends Serializable  {
      public void downloadMessage(String user, String message);
}

 

Inside the Client environment, I use these calls----------------
//chatIncomingMessages is a JTextArea instance to show the downloaded Messages
 -----------------------

      ChatRoom chatRoom= createChatRoom();

      ChatRoomListener listener=new ChatRoomListener(){
         private static final long serialVersionUID = -7779005097061534360L;
             public void downloadMessage(String user, String message){
                 chatIncomingMessages.append(""+user+": "+
message+"\n\r");
             }

      };

      if(chatRoom==null){
         System.err.println("Error: createChatRoom: returned
'null'");
      }else{
           try{
                chatRoom.addChatRoomListener(this.nickname, listener);
           }catch(RemoteException re){
                 // TODO Auto-generated catch block
                 re.printStackTrace();
           }

      }

------------- 
At the J2EE-Server  Side, the code looks like this 
attention: nicknamesListeners and chatterListeners 
are Linked Lists of String/ChatRoomListeners

-------------

public void addChatRoomListener(String nickname, ChatRoomListener listener){
    System.err.print("addChatRoomListener:");
    System.err.flush();
    for(int idx=0; idx < getInstance().nicknamesListeners.size();idx++){
        if(getInstance().nicknamesListeners.get(idx).equals(nickname)){
                // This nickanme already is logged in to this chatroom 
                return;
        }

   }

   System.err.println(nickname);
   System.err.flush();

 

   getInstance().chatterListeners.add(listener);
   getInstance().nicknamesListeners.add(nickname);

            return;

            

      }
=========================================
I receive this error context.
=========================================
java.rmi.MarshalException: CORBA MARSHAL 0x4942f89a No; nested exception is: 
      org.omg.CORBA.MARSHAL: 

>> SERVER (id=4773e3aa, host=depoiw0wk11it39.als.avnet.eu) TRACE START:

>>    org.omg.CORBA.MARSHAL: Unable to read value from underlying bridge :
null  vmcid: IBM  minor code: 89A  completed: No

>>    at
com.ibm.rmi.iiop.CDRInputStream.read_value(CDRInputStream.java:2105)

>>    at
ejbs._EJSRemoteStatefulChatRoom_916715b1_Tie.addChatRoomListener(_EJSRemoteState
fulChatRoom_916715b1_Tie.java:181)

>>    at
ejbs._EJSRemoteStatefulChatRoom_916715b1_Tie._invoke(_EJSRemoteStatefulChatRoom_
916715b1_Tie.java:105)

>>    at
com.ibm.CORBA.iiop.ServerDelegate.dispatchInvokeHandler(ServerDelegate.java:613)


 

P.S.: if I use a class instead of an interface,
the AddChatRoomListener Caall works without any problem!
-------------------------------------
Public class ChatRoomListener implements Serializable{??;}
-------------------------------------