Chat en java

[iLChopper]

Hola , antes que nada les muestro el codigo :

package server;


import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
private ServerSocket sv;
private Socket s;
private ObjectOutputStream os;
private ObjectInputStream oi;

public Server() {

try {
System.out.println("Server oN");
sv = new ServerSocket(2001);
s = sv.accept();
os = new ObjectOutputStream(s.getOutputStream());
oi =new ObjectInputStream(s.getInputStream());

os.writeUTF("HOLA CLIENTE");
System.out.println(oi.readUTF());



os.close();
s.close();
sv.close();
} catch (Exception e) {
e.printStackTrace();
System.out.println("ERROR");

}

}

public static void main(String args[]) {
new Server();

}
}

Mi idea es que se pueda conectar un cliente a traves de telnet .Pero al conectarse y querer enviar un dato, el server me tira el siguiente error:

Server oN
java.io.StreamCorruptedException: invalid stream header: 0D0A6473
ERROR
at java.io.ObjectInputStream.readStreamHeader(ObjectI nputStream.java:800)
at java.io.ObjectInputStream.<init>(ObjectInputStream .java:297)
at server.Server.<init>(Server.java:22)
at server.Server.main(Server.java:41)

a que se debe??