Bidirectional messaging!

Question

Hi All,
Im trying to do bidirectional messaging, so that each client could register themselves with the server so the server can call back to each client for updates.
But Im keeping having this problem when I run the client.Is it because Im not runing the rmic command, although I know that I wouldn�t need it if I use jdk1.5?
Can anyone help please? Thanks
java.rmi.StubNotFoundException: Stub class not found: txtArea_Stub; nested excep
tion is:
java.lang.ClassNotFoundException: txtArea_Stub
at sun.rmi.server.Util.createStub(Util.java:274)
at sun.rmi.server.Util.createProxy(Util.java:122)
at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:16
9)
at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.
java:293)
at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.
java:220)
at txtArea.<init>(txtArea.java:100)
at EditorView.<init>(EditorView.java:44)
at Client.main(Client.java:38)
Caused by: java.lang.ClassNotFoundException: txtArea_Stub
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at sun.rmi.server.Util.createStub(Util.java:268)
... 7 more
Edited by: Jioner_Dev on Jan 9, 2008 3:52 PM

Answer 1

Hi,
I did try to call the remote method from different thread on the server side but didn�t work either.
I did the following
These are the remote interfaces
public interface ClientMessages extends Remote
static int FAILURE = -1;
static int SUCCESS = 0;
int registerClient(String user,ServerMessages client)throws RemoteException;
void writeLock(String userName,String str)throws RemoteException;
public interface ServerMessages extends Remote{
public void callBack() throws RemoteException;
This is the ServerImpl
public class ServerImpl extends UnicastRemoteObject implements ClientMessages
some code
public int registerClient(String user,ServerMessages receiver)throws RemoteException
int message = ClientMessages.FAILURE;
if(user !=null)
if(clients.get(user) == null)
ClientThread clientThread = new ClientThread(receiver);
clientThread.run();
clients.put(user,clientThread);
message = ClientMessages.SUCCESS;
else
message = ClientMessages.FAILURE;
return message;
class ClientThread extends Thread
private ServerMessages client;
ClientThread( ServerMessages client )
this.client = client;
public void run()
while ( true )
try
sleep( 2000);
client.callBack();
catch ( Exception e )
stop();
public void writeLock(String userName,String str) throws RemoteException
Lock wlock = rwlock.writeLock();
wlock.lock();
try
for (User user: users)
if (user.getName().equals(userName))
domParser.UpdateDoc(new User(userName,str));
users = domParser.getList();
// callClients();
finally
wlock.unlock();
I tried to call this when the file gets updated didn�t work, then I commented but didn�t work either
public void callClients()throws RemoteException
for(Enumeration e = clients.elements();e.hasMoreElements();)
ClientThread clientThread = (ClientThread)e.nextElement();
clientThrea.run();
This is The Client remote object
public class txtArea extends JPanel implements java.io.Serializable, KeyListener , ServerMessages
UnicastRemoteObject.exportObjct(this,0);
some code
public void registerClient()
try
int message = serverStub.registerClient(userName,this);
if( message == ClientMessages.FAILURE)
e.printStackTrace();
System.exit(-1);
else
printData();
catch (Exception e)
e.printStackTrace();
System.exit(-1);
// update the server file
public void keyTyped(KeyEvent e) {
try{
serverStub.writeLock(userName,textPane.getText());
catch (Exception e1)
e1.printStackTrace();
Thanks