Applet servlet communication problem

Question

applet can receive data but cannot send data to the servlet (i.e. the servlet does not receive anything).
Listed below are the codes
//applet
ObjectOutputStream objStream = null;
        URL url = new URL(getCodeBase(), "/JSP/readAppletServlet");
        URLConnection con= url.openConnection();
        con.setDoInput(true);
        con.setDoOutput(true);
        con.setUseCaches(false);
        con.setDefaultUseCaches(false);
        con.setRequestProperty ("Content-Type", "application/x-java-serialized-object");
       try{
           objStream = new ObjectOutputStream(con.getOutputStream());
           String s = "i come from APPLET";
           objStream.writeObject(s);
           objStream.flush();
           objStream.close();
       }catch(Exception ex){
//servlet
public class readAppletServlet extends HttpServlet {
    /** Initializes the servlet.
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    /** Destroys the servlet.
    public void destroy() {
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        java.io.FileOutputStream asdf = new java.io.FileOutputStream(new java.io.File("C:\\13579.txt"));
        InputStream in = request.getInputStream();
        ObjectInputStream inputFromApplet = null;
        String s = " you cannot call servlet ar!!!! try again";
        try{
            inputFromApplet = new ObjectInputStream(in);
            s = inputFromApplet.readObject().toString();
            in.close();
        }catch(Exception ex){
        asdf.write(s.getBytes("US-ASCII"));
        asdf.close();
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    /** Returns a short description of the servlet.
    public String getServletInfo() {
        return "Short description";
}

Answer 1

As a (future) programmer the first thing you should learn is never just say "it doesn't work"
That's what first line support is for to get info out of "dumb" users who don't know better.
I suggested some code changes but you haven't re posted any code.
You think it might be the applet but I don't see any exception nor a trace from the applet.
To turn the full trace on (windows) you can start the java console, to be found here:
C:\Program Files\Java\j2re1.4...\bin\jpicpl32.exe
In the advanced tab you can fill in something for runtime parameters fill in this:
-Djavaplugin.trace=true -Djavaplugin.trace.option=basic|net|security|ext|liveconnect
if you cannot start the java console check here:
C:\Documents and Settings\userName\Application Data\Sun\Java\Deployment\deployment.properties
I think for linux this is somewhere in youruserdir/java (hidden directory)
add or change the following line:
javaplugin.jre.params=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
for 1.5:
deployment.javapi.jre.1.5.0.args=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
The trace is here:
C:\Documents and Settings\your user\Application Data\Sun\Java\Deployment\log\plugin...log
I think for linux this is somewhere in youruserdir/java (hidden directory)