Push Registry : MIDlet activated by servlet ?

Question

hello, i have been trying to figure this out for days now could someone please help. I am trying to get the MIDlet to by activated by a Servlet which resides on a apache webserver , is this possible?
how do you go about in getting the MIDlet to register a connection which waits for some activity sent via HTTP? do you register a socket to listen on a port on the device and get the servlet to send data to that port via HTTP?(if so how is this done?)
Basically all i am trying to do is get a servlet to send data to the midlet. The MIDlet is installed from the webserver with ease, i want the midlet to wait till the server decides to send some data. the servlet will activate the midlet (this is the problem) , so then the midlet will open the http connection to the servlet.
Please ask if the question needs clarifying, I would be very thankful for any advice provided.
cheers
Max

Answer 1

thanks for info
i have been trying for a while now and cant seem to get this working what i have got is a MIDlet that listens on port 90 of a socket connection. i am trying to create a Servlet that sends data onto port 90 so the midlet can be activated via the push registry. i am having the trouble with the servlet(which i cant get working, i assume that the code is wrong), i cant seem to get a socket connection working, i have tried to open a socket connection but have had no luck.
i have posted some code, the MIDlet is there and so is my attempt at a servlet.
what i want to do is get the servlet sending the midlet data on a specified port
and the midlet recieveing that data and displaying it on the mobile emulator
(so far all the MIDlet code does is listen for some activaty on port 90 and then send some data to the browser on the following url : http://localhost:90/)
if anyone can get this problem on this example code i am testing on, fixed it would be much appreciated!!
Thanks
Max
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.pki.*;
public class PatchyMIDlet
    extends MIDlet
    implements CommandListener, Runnable {
  private Display mDisplay;
  private Form mForm;
  private ServerSocketConnection mServerSocketConnection;
  private boolean mTrucking = true;
  public void startApp() {
    mDisplay = Display.getDisplay(this);
    if (mForm == null) {
      mForm = new Form("PatchyMIDlet");
      mForm.addCommand(new Command("Exit", Command.EXIT, 0));
      mForm.setCommandListener(this);
    Thread t = new Thread(this);
    t.start();
    mDisplay.setCurrent(mForm);
  public void pauseApp() {}
  public void destroyApp(boolean unconditional) { shutdown(); }
  private void log(String text) { log(null, text); }
  private void log(String label, String text) {
    StringItem si = new StringItem(label, text);
    si.setLayout(Item.LAYOUT_NEWLINE_AFTER);
    mForm.append(si);
  private void shutdown() {
    mTrucking = false;
    try { mServerSocketConnection.close(); }
    catch (IOException ioe) {}
  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT) {
      shutdown();
      notifyDestroyed();
  public void run() {
    try {
      mServerSocketConnection =
(ServerSocketConnection)Connector.open("socket://:90");
      log("Startup complete.");
      SocketConnection sc = null;
      while (mTrucking) {sc =
(SocketConnection)mServerSocketConnection.acceptAndOpen();
        log("client: ", sc.getAddress());
        // Strictly speaking, each client connection
        // should be handled in its own thread. For
        // simplicity, this implementation handles
        // client connections inline.
        Reader in = new InputStreamReader(sc.openInputStream());
        String line;
        while ((line = readLine(in)) != null) ;
        // Ignoring the request, send a response.
        PrintStream out = new PrintStream(sc.openOutputStream());
        out.print("HTTP/1.1 200 OK\r\n\r\n");
        out.print(getMessage());
        out.close();
        in.close();
        sc.close();
    catch (Exception e) {
      log("exception: ", e.toString());
  private String readLine(Reader in) throws IOException {
    // This is not efficient.
    StringBuffer line = new StringBuffer();
    int i;
    while ((i = in.read()) != -1) {
      char c = (char)i;
      if (c == '\n') break;
      if (c == '\r') ;
      else line.append(c);
    if (line.length() == 0) return null;
    return line.toString();
  private java.util.Random mRandom = new java.util.Random();
  private String getMessage() {
    int i = Math.abs(mRandom.nextInt()) % 5;
    String s = null;
    switch (i) {
      case 0: s = "Above all the others we'll fly"; break;
      case 1: s = "There is no reason to hide"; break;
      case 2: s = "I dreamed about Ray Charles last night"; break;
      case 3: s = "Someone keeps moving my chair"; break;
      case 4: s = "Joseph's face was black as night"; break;
      default: break;
    return s;
}the Servlet code, which i cant get working:
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.net.*;
import java.lang.*;
public class Servlet extends HttpServlet {
  private int mCount;
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws
      ServletException, IOException {
    String message = "Hits: " + ++mCount;
    String connectString = "socket://:90";
    SocketConnection sc = null;
    DataOutputStream dos = null;
      // open a socket connection with the remote server
      sc = (SocketConnection) Connector.open(connectString);
// an OutputStream is created on top of the
      // OutputConnection object for write operations
      dos = sc.openDataOutputStream();
// perform write operations
      dos.writeChars("hello");
  }