Scratch

Hi I'm trying to use the remote Sensor Protocoll in SCRATCH to connect to a simple JAVA Middleware. It's no problem to send broadcasts from SCRATCH to the middleware. But SCRATCH crashes if i try to send something from the middleware to SCRATCH.

My Java-Code looks like:

private void sendToScratch(java.net.Socket socket, String dataOut){
         PrintWriter printWriter;
        try {
            printWriter = new PrintWriter(
                new OutputStreamWriter(
                    socket.getOutputStream()));
       
        
        byte [] sizeBytes = { 0, 0, 0, 0 };
       
          sizeBytes[3] = (byte)dataOut.length();
          System.out.println("Sende größe:"+sizeBytes[3]);
         System.out.println(dataOut);
          for (int i=0; i<4; i++) {                 
           
                printWriter.write(sizeBytes[i]);
               
                // TODO Auto-generated catch block
               
            }   
         printWriter.write(dataOut);
         printWriter.flush();
          System.out.println("send");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
          
    }