RMI Client - ClassCastException error

Server classes :

FreeTalkServer - Class in which main method is written

TalkServerInt - Interface class for RMI

TalkServerImpl - Implementation class for RMI

and then I used rmic and got skeleton class and stub class.

Client Classes :

ChatWindow - GUI class

Main - Class which invokes RMI.

package freetalkclient;

import com.datatype.FrameFormat;

import com.datatype.TalkServerInt;

import java.net.MalformedURLException;

import java.rmi.Naming;

import java.rmi.NotBoundException;

import java.rmi.RemoteException;

public class Main {

private String me;

public String getFrom() {

return me;

}

private Main() {

}

public static void main(String[] args) {

final Main m = new Main();

if (System.getSecurityManager() == null) {

System.setSecurityManager(new SecurityManager());

}

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new ChatWindow(m).setVisible(true);

}

});

}

public void send(ChatWindow windows,FrameFormat frame) {

try {

TalkServerInt server = (TalkServerInt) Naming.lookup("rmi://localhost/TalkServer");

server.sendData(frame);

} catch (RemoteException ex) {

ex.printStackTrace();

} catch (MalformedURLException ex) {

ex.printStackTrace();

} catch (NotBoundException ex) {

ex.printStackTrace();

}

}

}

Hope this gives better picture. I haven't shown server classes because it's working fine.. problem with client classes only...

chaos_begins_here at 2007-7-7 14:55:44 >

Sorry I couldn't understand what to do to correct the error..

Let me show the server's main method ...

public static void main(String args[]) {

if(System.getSecurityManager()==null) {

System.setSecurityManager(new RMISecurityManager());

}

try {

TalkServerImpl server = new TalkServerImpl();

Naming.rebind("//localhost/TalkServer",server);

System.out.println("Server bound..");

}catch(Exception e) {

e.printStackTrace();

}

}

If you don't mind can tell me what needs to be done ....

chaos_begins_here at 2007-7-7 14:55:44 >

After I have changed it I'm getting a different error this time.

I'm getting Null pointer exception.

public void send(ChatWindow windows,FrameFormat frame) {

try {

TalkServerInt server = (TalkServerInt) Naming.lookup("//localhost/TalkServer");

System.out.println(frame.getTo());

if(server==null) {

System.out.println("Null error");

}else {

server.sendData(frame);

}

} catch (RemoteException ex) {

System.out.println("er1");

ex.printStackTrace();

} catch (MalformedURLException ex) {

System.out.println("er2");

ex.printStackTrace();

} catch (NotBoundException ex) {

System.out.println("er3");

ex.printStackTrace();

}

}

This is the code that sends out the data. Some one help me please.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

at com.main.TalkServerImpl.sendData(TalkServerImpl.java:43)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)

at sun.rmi.transport.Transport$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at sun.rmi.transport.Transport.serviceCall(Unknown Source)

at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)

at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)

at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)

at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)

at com.main.TalkServerImpl_Stub.sendData(Unknown Source)

at freetalkclient.Main.send(Main.java:45)

at freetalkclient.ChatWindow.jBSend_Click(ChatWindow.java:95)

at freetalkclient.ChatWindow.access$000(ChatWindow.java:15)

at freetalkclient.ChatWindow$1.actionPerformed(ChatWindow.java:50)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)

at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)

at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)

at java.awt.Component.processMouseEvent(Component.java:5488)

at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)

at java.awt.Component.processEvent(Component.java:5253)

at java.awt.Container.processEvent(Container.java:1966)

at java.awt.Component.dispatchEventImpl(Component.java:3955)

at java.awt.Container.dispatchEventImpl(Container.java:2024)

at java.awt.Component.dispatchEvent(Component.java:3803)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)

at java.awt.Container.dispatchEventImpl(Container.java:2010)

at java.awt.Window.dispatchEventImpl(Window.java:1778)

at java.awt.Component.dispatchEvent(Component.java:3803)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

chaos_begins_here at 2007-7-7 14:55:44 >