This is not the problem.

I extracted the problematic code. The client is:

import java.net.*;
import java.io.*;
public class Client
{
   public static void main(String[] args) {
       byte[] sendData = new byte[1024];
       byte[] rcvData = new byte[8];
       try {
           // connect to the node
           Socket socket = new Socket("planetlab02.ethz.ch", 5452);
           InputStream is = socket.getInputStream();
           OutputStream os = socket.getOutputStream();

           for(int i = 0; i < 50; i++) {
               os.write(sendData);
               os.flush();
               System.out.print("written...");
               is.read(rcvData);
               System.out.println("read...");
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
}

and the server:

import java.net.*;
import java.io.*;
public class Server {

   public static void main(String[] args) {
   try {
        Socket socket = null;
        InputStream is = null;
        OutputStream os = null;
        ServerSocket serverSocket = new ServerSocket(5452);

        // accept connections until thread is terminated
        while (true) {
            socket = serverSocket.accept();

            // if something tried to connect
           is = socket.getInputStream();
           os = socket.getOutputStream();

           byte[] b = new byte[1024];
           byte[] a = new byte[8];

           for (int i = 0; i < 50; i++) {
               is.read(b);
               System.out.print("read...");
               os.write(a);
               os.flush();
               System.out.println("written...");
           }

           socket.close();
       }
   } catch (Exception e) {
       e.printStackTrace();
   }
   }
}

I know this code doesn't really make sense. But it's taken out of
context to illustrate the problem (which of course still exists). After
a few read/writes, the mentioned error occurs.

Thanks and regards,

Stefan Weber