Help needed in HTTP Tunneling - urgent

Hi all,
I urgently need a working code sample of a client which sends requests to a server that redirects the request to an RMI server via RMI servlet.
Does any of you familiar of such a code sample?
Thanks

I'm sorry, but HTTP Tunneling is not working for me. I must have done something wrong.
Let me describe my configuration:
I have a server behind NAT router which connected to apache2 and tomcat 4.1 web servers. The apache2 and tomcat are not connected between them.
I deployed war file on tomcat which contains the servlet for the HTTP Tunneling which its code is:
public class RmiHttpTunnelerServlet extends HttpServlet
    public void init(ServletConfig config) throws ServletException
        super.init(config);
        System.out.println("Simplified RMI Servlet Handler loaded successfully.");
    public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
        try
            String queryString = req.getQueryString();
            String command, param;
            int delim = queryString.indexOf("=");
            if (delim == -1)
                command = queryString;
                param = "";
            else
                command = queryString.substring(0, delim);
                param = queryString.substring(delim + 1);
            if (command.equalsIgnoreCase("forward"))
                try
                    ServletForwardCommand.execute(req, res, param);
                catch (ServletClientException e)
                    returnClientError(res, "client error : " + e.getMessage( ));
                    e.printStackTrace();
                catch (ServletServerException e)
                    returnServerError(res, "internal server error : " + e.getMessage());
                    e.printStackTrace();
            else
                returnClientError(res, "invalid command: " + command);
        catch (Exception e)
            returnServerError(res, "internal error: " + e.getMessage());
            e.printStackTrace();
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
        returnClientError(res, "GET Operation not supported: Can only forward POST requests.");
    public void doPut(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
        returnClientError(res, "PUT Operation not supported: Can only forward POST requests.");
    public String getServletInfo()
        return "Simplified RMI Call Forwarding Servlet Servlet.<br>\n ";
    private static void returnClientError(HttpServletResponse res, String message) throws IOException
        res.sendError(HttpServletResponse.SC_BAD_REQUEST,
                      "<HTML><HEAD><TITLE>Java RMI Client Error < / TITLE > < / HEAD > < BODY > " +
                      "<H1>Java RMI Client Error</H1>" + message + "</BODY></HTML>");
        System.err.println(HttpServletResponse.SC_BAD_REQUEST + "Java RMI Client Error" + message);
    private static void returnServerError(HttpServletResponse res,
                                          String message) throws IOException
        res.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                      "<HTML><HEAD>< TITLE > Java RMI Server Error < / TITLE > < / HEAD > < BODY > " +
                      "<H1>Java RMI Server Error < / H1 > " + message + " < / BODY > < / HTML > ");
        System.err.println(HttpServletResponse.SC_INTERNAL_SERVER_ERROR + "Java RMI Server Error : " + message);
    }There is also a utility class:
public class ServletForwardCommand {
    public static void execute(HttpServletRequest request, HttpServletResponse response, String stringifiedPort)
        throws ServletClientException, ServletServerException, IOException {
        int port = convertStringToPort(stringifiedPort);
        Socket connectionToLocalServer = null;
        try {
            connectionToLocalServer = connectToLocalServer(port);
            forwardRequest(request, connectionToLocalServer);
            forwardResponse(response, connectionToLocalServer);
        } finally {
            if (null != connectionToLocalServer) {
                connectionToLocalServer.close();
    private static int convertStringToPort(String stringfiedPort) throws ServletClientException {
        int returnValue;
        try {
            returnValue = Integer.parseInt(stringfiedPort);
        } catch (NumberFormatException e) {
            throw new ServletClientException("invalid port number: " + stringfiedPort);
        if (returnValue <= 0 || returnValue > 0xFFFF) {
            throw new ServletClientException("invalid port: " + returnValue);
        if (returnValue < 1024) {
            throw new ServletClientException("permission denied for port: " + returnValue);
        return returnValue;
    private static Socket connectToLocalServer(int port) throws ServletServerException {
        Socket returnValue;
        try {
            returnValue = new Socket(InetAddress.getLocalHost(), port);
        } catch (IOException e) {
            throw new ServletServerException("could not connect to " + "local port");
        return returnValue;
    private static void forwardRequest(HttpServletRequest request, Socket connectionToLocalServer)
        throws IOException, ServletClientException, ServletServerException {
        byte buffer[];
        DataInputStream clientIn = new DataInputStream(request.getInputStream());
        buffer = new byte[request.getContentLength()];
        try {
            clientIn.readFully(buffer);
        } catch (EOFException e) {
            throw new ServletClientException("unexpected EOF " + "reading request body");
        } catch (IOException e) {
            throw new ServletClientException("error reading request" + " body");
        DataOutputStream socketOut = null;
        // send to local server in HTTP
        try {
            socketOut = new DataOutputStream(connectionToLocalServer.getOutputStream());
            socketOut.writeBytes("POST / HTTP/1.0\r\n");
            socketOut.writeBytes("Content-length: " + request.getContentLength() + "\r\n\r\n");
            socketOut.write(buffer);
            socketOut.flush();
        } catch (IOException e) {
            throw new ServletServerException("error writing to server");
    private static void forwardResponse(HttpServletResponse response, Socket connectionToLocalServer)
        throws IOException, ServletClientException, ServletServerException {
        byte[] buffer;
        DataInputStream socketIn;
        try {
            socketIn = new DataInputStream(connectionToLocalServer.getInputStream());
        } catch (IOException e) {
            throw new ServletServerException("error reading from " + "server");
        String key = "Content-length:".toLowerCase();
        boolean contentLengthFound = false;
        String line;
        int responseContentLength = -1;
        do {
            try {
                line = socketIn.readLine();
            } catch (IOException e) {
                throw new ServletServerException("error reading from server");
            if (line == null) {
                throw new ServletServerException("unexpected EOF reading server response");
            if (line.toLowerCase().startsWith(key)) {
                responseContentLength = Integer.parseInt(line.substring(key.length()).trim());
                contentLengthFound = true;
        while ((line.length() != 0) &&
            (line.charAt(0) != '\r') && (line.charAt(0) != '\n'));
        if (!contentLengthFound || responseContentLength < 0)
            throw new ServletServerException("missing or invalid content length in server response");
        buffer = new byte[responseContentLength];
        try {
            socketIn.readFully(buffer);
        } catch (EOFException e) {
            throw new ServletServerException("unexpected EOF reading server response");
        } catch (IOException e) {
            throw new ServletServerException("error reading from server");
        response.setStatus(HttpServletResponse.SC_OK);
        response.setContentType("application/octet-stream");
        response.setContentLength(buffer.length);
        try {
            OutputStream out = response.getOutputStream();
            out.write(buffer);
            out.flush();
        } catch (IOException e) {
            throw new ServletServerException("error writing response");
}I checked also with packets monitoring tool, I couldn't see any http transportation.
Any help will be appreciated.

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Thank you for you help, but i'am still a bit confused. The "pshah" was a typo, it should have been pshah3, so that's not the problem. Here's a more detailed explanation of what i'am trying.
I am declaring the exitlister class in the following path:
c:\java\hw5\src\pshah3\library\gui
The file is fairly simple, it looks like this.
package pshah3.library.gui;
import java.awt.*;
import java.awt.event.*;
public class ExitListener extends WindowAdapter{
     public void windowClosing(WindowEvent event) {
          System.exit(0);
The other file that i'am including is in the same location...it starts out like this.
package pshah3.library.gui;
import pshah3.library.*;
import java.io.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class GraphicalGui {
          public static void main (String[] args){
          JFrame backGround = new JFrame("Tech Library");
          backGround.setSize(400,150);
          backGround.addWindowListener (new ExitListener());
          Container content = backGround.getContentPane();
I am compiling from the c:\java\hw5 directory with the command
javac -classpath classes -sourcepath src -d classes src\pshah3\library\gui\GraphicalGui.java
I am doing this so all the classes go in a "classes" directory with the same heirarchy as the source.
Do you think i'am doing something funky with the packages??
Again the error is:
src\pshah3\library\gui\GraphicalGui.java:39: error while writing <anonymous pshah3.library.gui.GraphicalGui$1>: classes\pshah3\library\gui\GraphicalGui$1.class
(The system cannot find the path specified)
public void actionPerformed(ActionEvent e) { System.exit
(0); }
THANKS A LOT!!!

Help needed about HTTPS and policy files !!

Hi everyone,
my Web Start application crashes with a SSLPeerUnverifiedException when I
try to connect to the server with HTTPClient :
// proxy settings
HTTPConnection.setProxyServer(ipProxy, portProxy);
// connection
HTTPConnection con = new HTTPConnection("https", serverName, -1);
// Post (then there is a SSLPeerUnverifiedException....)
HTTPResponse rsp = con.Post("/myurl.jsp, toSend, ct_hdr);
My application runs in a secure environnement configured by the javaws.policy :
grant codeBase "file:${jnlpx.home}/javaws.jar" {
permission java.security.AllPermission;
and the ${user.home}.java.policy (shared by another application, an applet I think) :
keystore "file:${user.home}/xxxxxxxxxxxxxxxxxxxxx.p7c";
grant codebase "https://xxxxxxxxxxxxxxx/-" signedby "xxxxxxxxxx" {
permission java.lang.RuntimePermission "usePolicy";
permission java.lang.RuntimePermission "accessDeclaredMembers";
permission java.lang.RuntimePermission "setIO";
permission java.lang.RuntimePermission "modifyThread";
permission java.lang.RuntimePermission "stopThread";
permission java.lang.RuntimePermission "accessClassInPackage.sun.security.provider";
permission java.lang.RuntimePermission "loadLibrary.*";
permission java.security.SecurityPermission "insertProvider.SUN";
permission java.security.SecurityPermission "insertProvider.JCRYPTO";
permission java.security.SecurityPermission "insertProvider.JCRYPTO_PKCS11";
permission java.security.SecurityPermission "putProviderProperty.JCRYPTO";
permission java.security.SecurityPermission "putProviderProperty.JCRYPTO_PKCS11";
permission java.security.SecurityPermission "removeProviderProperty.JCRYPTO";
permission java.security.SecurityPermission "removeProvider.JCRYPTO";
permission java.security.SecurityPermission "removeProvider.JCRYPTO_PKCS11";
permission java.security.SecurityPermission "removeProvider.SUN";
permission java.util.PropertyPermission "*", "read,write";
permission java.io.FilePermission "<<ALL FILES>>", "write,read,delete";
permission java.net.NetPermission "specifyStreamHandler";
permission java.net.SocketPermission "localhost:1024-", "listen";
permission java.net.SocketPermission "*", "connect,accept,listen,resolve";
permission java.awt.AWTPermission "accessClipboard";
permission java.lang.RuntimePermission "queuePrintJob";
permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
permission java.awt.AWTPermission "showWindowWithoutWarningBanner";
grant codebase "file:/myApplication/-" {
permission java.security.AllPermission;
In this file (.java.policy) when I replace "codebase "https://xxxxxxxxxxxxxxx/-""
by "codebase "http://xxxxxxxxxxxxxxx/-"" everything works fine !! It's very very
very very strange...
my application is launched by Web Start 1.2 and use JRE 1.4.1
Any ideas ? Please, I become crazy...

In this file (.java.policy) when I replace "codebase
"https://xxxxxxxxxxxxxxx/-""
by "codebase "http://xxxxxxxxxxxxxxx/-"" everything
works fine !! I am not so sure that a code source cares for whether the resource is downloaded with s-http or normal http. Is the distinction important for the policy file?
You could go digging in the RFC that describes what a URL is (because that is what the code source is).
Also you could switch on a nice flag in you server environment that output information if security things go wrong: -Djava.security.debug=failure
In the output you should see from where your code is loaded. If it says http and not https, then that is what should appear in your policy file.

Help needed for CORBA over Http through proxy server[Very Urgent]

Hi Friendz,
I am new to J2EE. Right now I am learning RMI, Corba now.
In RMI, to pass through Http to bypass firewall or through proxy sever, we can use either Http to port or Http to CGI/Servlet i.e., Http tunneling.
In the same, I am running a simple corba application, i want my corba application to pass through my proxy server using http which is configured to address 127.0.0.1 and port 8118.
How to pass my corba application through proxy server. please help me and it is very urgent.
Is it possible or not, please let me know some comments about this topic
Thanks in advance Friends for your help

This is so extremely urgent that it needs to be asked multiple times.
http://forum.java.sun.com/thread.jspa?threadID=762950

Help needed in HTTP Tunneling - urgent

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