J2me multipart file upload- Help Needed

Question

package com.mpbx;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
public class PostFile extends MIDlet implements Runnable, CommandListener{
    private final String FILE = "/image.jpg";
    private final String URL = "http://localhost/post.php"; // change this to a valit page.
    private final String CrLf = "\r\n";
    private Form form = null;
    private Gauge gauge = null;
    private Command exitCommand;
    private Command uploadCommand;
    public PostFile(){
        form = new Form("Upload File");
        gauge = new Gauge("Progress:", true, 100, 0);
        form.append(gauge);
        exitCommand = new Command("Exit", Command.EXIT, 0);
        uploadCommand = new Command("Upload", Command.SCREEN, 0);
        form.addCommand(exitCommand);
        form.addCommand(uploadCommand);
        form.setCommandListener(this);
    public void startApp() {
        Display.getDisplay(this).setCurrent(form);
    public void pauseApp() {
    public void destroyApp(boolean unconditional) {
    private void progress(int total, int current){
        int percent = (int) (100 * ((float)current/(float)total));
        gauge.setValue(percent);
    public void run() {
        httpConn();
    private void httpConn(){
        HttpConnection conn = null;
        OutputStream os = null;
        InputStream is = null;
        try{
            System.out.println("url:" + URL);
            conn = (HttpConnection)Connector.open(URL);
            conn.setRequestMethod(HttpConnection.POST);
            String postData = "";
            InputStream imgIs = getClass().getResourceAsStream(FILE);
        byte []imgData = new byte[imgIs.available()];
           imgIs.read(imgData);
            String message1 = "";
            message1 += "-----------------------------4664151417711" + CrLf;
            message1 += "Content-Disposition: form-data; name=\"uploadedfile\"; filename=\"" + FILE + "\"" + CrLf;
            message1 += "Content-Type: image/jpeg" + CrLf;
            message1 += CrLf;
            // the image is sent between the messages ni the multipart message.
            String message2 = "";
            message2 += CrLf + "-----------------------------4664151417711--" + CrLf;              
            conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=---------------------------4664151417711");
            // might not need to specify the content-length when sending chunked data.
            // conn.setRequestProperty("Content-Length", String.valueOf((message1.length() + message2.length() + imgData.length)));
            System.out.println("open os");
            os = conn.openOutputStream();
            System.out.println(message1);
            os.write(message1.getBytes());
            // SEND THE IMAGE
            int index = 0;
            int size = 1024;
            do{
                System.out.println("write:" + index);
                if((index+size)>imgData.length){
                    size = imgData.length - index;
                os.write(imgData, index, size);
                index+=size;
                progress(imgData.length, index); // update the progress bar.
            }while(index<imgData.length);
            System.out.println("written:" + index);           
            System.out.println(message2);
            os.write(message2.getBytes());
            os.flush();
            System.out.println("open is");
            is = conn.openInputStream();
            char buff = 512;
            int len;
            byte []data = new byte[buff];
            do{
                System.out.println("READ");
                len = is.read(data);
                if(len > 0){
                    System.out.println(new String(data, 0, len));
            }while(len>0);
            System.out.println("DONE");
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            System.out.println("Close connection");
            try{
                os.close();
            }catch(Exception e){}
            try{
                is.close();
            }catch(Exception e){}
            try{
                conn.close();           
            }catch(Exception e){}
    public void commandAction(javax.microedition.lcdui.Command command, javax.microedition.lcdui.Displayable displayable) {
        if(command == exitCommand){
            this.notifyDestroyed();
        }else if(command == uploadCommand){
            new Thread(this).start();
}Running this yields the error below...Can someone suggest me. whats the problem.
url:http://localhost/post.php
java.lang.NullPointerException
        at com.mpbx.PostFile.httpConn(PostFile.java:85)
        at com.mpbx.PostFile.run(PostFile.java:68)
Close connection

Answer 1

I also faced the same problem. To make this code work you will have to include the image.jpg in the jar. To do that, copy the image file in the src directory inside your project folder (if you are using netbeans) and then build the project.
Remember, the web server should be running in background.