Chat with GWT

Hello, im new in programming with GWT and im trying to make a Chat
application.
I have a class Receiver, responsible to get the messages from the
server and show them in a TextArea.
It's something like this:

class ChatEntryPoint implements EntryPoint{

Receiver r;
final TextArea ta;

public void onModuleLoad() {

r = new Receiver(id){

@Override
public void getMessage(String msg) {
ta.setText(msg);
}

};
}
}

public class Receiver implements java.io.Serializable{

private static final long serialVersionUID = -2358499438887497539L;
private String id;

public Receiver(){
this.id = "";
}

public Receiver(String id){
this.id = id;
}

public void getMessage(String msg) {
}
}

Even assigning the java.io.Serializable, i get the serialization error
message, when i call the getMessage method from my Servlet.
What is wrong with my Receiver?

Ps: Please, forgive my bad english.

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