How do I get *.jar files to work?

I don't think that simply saving java files as jar files works by itself. Do I need some kind of converter program?

Assuming you are using windows 2000, first go to Start > Settings > Control Panel > System > Advanced > Environment Variables. Then make sure the full path of the jar file is included in your CLASSPATH. This is where Java looks to see what packages might need to be included.
If you are not using Win 2K, then do a search here for "setting classpath" and you will get a ton of info.
Rebies

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Help needed: getting jar files to work.

Right, to start off, i have been doing php and mysql for a long time and i thought it's time to start using java.
So now im trying to create an application. I use eclipse. All works well if i run the program from eclipse. But i want to create and executable or a jar file first. I used JSmooth but with that i get an error "Could not find the main class".
While exporting the project as a jar i specified the main class in manifest specification.
So these are my classes:
the Main.class
public class Main{
     public static void main(String[] args) {
          PageFrame page = new PageFrame();
          page.show();
}and the PageFrame.class
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
class PageFrame extends JFrame implements ActionListener,MouseListener{
     String[] skillnames = {"attack","hitpoints","mining","strength","agility","smithing","defence","herblore","fishing","ranged","thieving","cooking",
               "prayer","crafting","firemaking","magic","fletching","woodcutting","runecraft","slayer","farming","construction","hunter","summoning"};
     JTextField username = new JTextField("",12);
     JTextArea box = new JTextArea(10,12);
     JButton search = new JButton("Search");
     int[] differences = {0,83,174,276,388,512,650,801,969,1154,1358,1584,1833,2107,2411,2746,3115,3523,3973,4470,5018,5624,6291,7028,7824,
               8740,9730,10824,12031,13363,14833,16456,18247,20224,22406,24815,27473,30408,33648,37224,41171,45529,50339,55649,61512,67983,
               75127,83014,91721,101333,111945,122660,136594,150872,166636,184040,203254,224466,247886,273742,302288,333804,368599,407015,
               449428,496254,547953,605032,668051,737627,814445,899257,992895,1096278,1210421,1336443,1475581,1629200,1798808,1986068,2192818,
               2421087,2673114,2951373,3258594,3597792,3972294,4385776,4842295,5346332,5902831,6517253,7195629,7944614,8771558,9684577,10692629,
               11805606,13034431,14567891};
     URL page;
     static String name;
     JLabel[] skills = new JLabel[24];
     JLabel skillicons = new JLabel();
     public PageFrame(){
          super("Stats Lookup");
          setSize(800,600);
          setResizable(false);
          try{
               UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
               SwingUtilities.updateComponentTreeUI(this);
          }catch (Exception e){
               System.err.println("Yo" + e);
          //teen labelid;
          for (int i = 0; i < skills.length;i++){
               ImageIcon icon = new ImageIcon(PageFrame.class.getResource("images/skillimages/" + skillnames[i] + ".gif"));
               skills[i] = new JLabel("00",icon,JLabel.CENTER);
          JPanel pane = new JPanel();
          GridBagLayout maingrid = new GridBagLayout();
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          GridBagConstraints constraints = new GridBagConstraints();
          JPanel skillPane = new JPanel();
          GridBagLayout levelslyo = new GridBagLayout();
          GridBagConstraints sConstraints = new GridBagConstraints();
          sConstraints.ipadx = 15;
          sConstraints.ipady = 10;
          skillPane.setLayout(levelslyo);
          int k = 0;
          int m = 1;
          buildconstraints(sConstraints,12,4,1,1,2,2);
          skillPane.add(skillicons);
          for (int i = 0; i < skills.length;i++){
               buildconstraints(sConstraints,m,k,1,1,2,2);
                    levelslyo.setConstraints(skills, sConstraints);
                    //skills[i].setText(" 0 ");
                    skillPane.add(skills[i]);
                    skills[i].addMouseListener(this);
                    m+=2;
                    if (m == 7){
                         m = 1;
                         k +=1;
          /*m = 0;
          k = 0;
          for (int i = 0; i < skills.length;i++){
               System.out.println("Paremale: " + m + " Alla: " + k);
               buildconstraints(sConstraints,m,k,1,1,2,2);
               levelslyo.setConstraints(skillicons, sConstraints);
               skillicons = new JLabel(icon);
               skillPane.add(skillicons);
                    m+=2;
                    if (m == 6){
                         m = 0;
                         k +=1;
          buildconstraints(constraints,0,0,1,1,100,100);
          maingrid.setConstraints(username, constraints);
          buildconstraints(constraints,1,0,1,1,100,100);
          maingrid.setConstraints(search, constraints);
          buildconstraints(constraints,0,1,1,1,100,100);
          maingrid.setConstraints(skillPane, constraints);
          pane.setLayout(maingrid);
          constraints.fill = GridBagConstraints.BOTH;
          search.addActionListener(this);
          box.setEditable(false);
          buildconstraints(constraints,1,1,2,1,120,100);
          maingrid.setConstraints(box, constraints);
          pane.add(username);
          pane.add(search);
          pane.add(box);
          pane.add(skillPane);
          setContentPane(pane);
          //getContentPane().add(scroll);
          pack();
          setVisible(true);
          WindowListener l = new WindowAdapter(){
               public void windowClosing(WindowEvent evt){
                    System.exit(0);
          addWindowListener(l);
     void buildconstraints(GridBagConstraints gbc, int gx, int gy, int gw, int gh, int wx,int wy){
          gbc.gridx = gx;
          gbc.gridy = gy;
          gbc.gridwidth = gw;
          gbc.gridheight = gh;
          gbc.weightx = wx;
          gbc.weighty = wy;
     /*Vector ranks = new Vector();
     Vector levels = new Vector();
     Vector exp = new Vector();*/
     class Stats{
          int[] levels = new int[34];
          int[] experience = new int[34];
          int[] ranks = new int[34];
     Stats stats = new Stats();
     public void getStats(URL url){
          URLConnection conn = null;
          InputStreamReader in;
          BufferedReader data;
          String line;
          StringBuffer buf = new StringBuffer();
          try{
               conn = this.page.openConnection();
               conn.connect();
               //box.setText("Connection opened");
               in = new InputStreamReader(conn.getInputStream());
               data = new BufferedReader(in);
               //box.setText("Reading data...");
               int ts=0;
               while ((line = data.readLine()) != null){
                    buf.append(line + "\n");
                    StringTokenizer tokenize;
                    tokenize = new StringTokenizer(line.toString(),",");
                    int[][] paarid = {{1,0},{2,3},{3,6},{4,1},{5,9},{6,12},{7,15},{8,11},{9,17},{10,16},{11,8},{12,14},{13,13},
                              {14,5},{15,2},{16,7},{17,4},{17,10},{19,19},{20,20},{21,18},{22,22},{23,21},{24,23}};
                    if (ts < 25 && ts > 0){
                         int slot = paarid[ts-1][1];
                              stats.ranks[slot] = Integer.parseInt(tokenize.nextToken());
                              int yo = Integer.parseInt(tokenize.nextToken());
                              stats.levels[slot] =yo;
                              stats.experience[slot] = Integer.parseInt(tokenize.nextToken());
                    ts++;
               for (int i = 0; i < skills.length;i++){
                    String text = ""+stats.levels[i];//testings[i];//
                    skills[i].setText(text);
          }catch(IOException e){
               box.setText("Insert a username \nfirst!");
     public String getNextXp(int level, int currxp){
          String nextXp;
          if (level > 98){
               nextXp = "N/A";
          }else{
               nextXp = ""+(differences[level] - currxp);
          return nextXp;
     public void actionPerformed(ActionEvent evt){
               String newuser = username.getText().toString();
               name = newuser;
               String address = "http://hiscore.runescape.com/index_lite.ws?player="+name;
               try{
                    page = new URL(address);
                    getStats(page);
               }catch(MalformedURLException e){
                    box.setText("Insert a username");
               repaint();
     public void mouseEntered(MouseEvent e) {
          //if (experience[].isEmpty()){
               Object s = e.getSource();
               for (int i = 0; i < skills.length;i++){
                    if (s == skills[i]){
                         box.setText("Rank: " + stats.ranks[i] + "\nExperience: " + stats.experience[i] + "\nExp until next: " + getNextXp(stats.levels[i],stats.experience[i]));
     public void mouseExited(MouseEvent e) {
box.setText("");
     public void mouseClicked(MouseEvent e) {
     public void mousePressed(MouseEvent e) {
     public void mouseReleased(MouseEvent e) {
This is just a little project i thought i'd make for learning.
But can anyone help me make a working jar or an exe file?
The Jar i created does nothing, no error or anything.
Thanks for Help.

How should i run the jar file then? I am double clicking it yes.
EDIT: i ran the program through command line and i got an error:
Exception in thread "main" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at PageFrame.<init>(PageFrame.java:41)
at Main.main(Main.java:4)OK - so it looks like you've found a command line!
You read these stack traces from the top down. Often the most interesting line is the first line that refers to your code. In this case line 41 of PageFrame.java which, I guess is this:
ImageIcon icon = new ImageIcon(PageFrame.class.getResource(
        "images/skillimages/" + skillnames[i] + ".gif"));The ImageIcon constructor is grumbling about being told to construct an icon from a null resource. getResource() will return null if it cannot find the resource that you specify.
The first thing to do is check that the .gif image is where it should be. You have specified it as "images/skillimages/etc" so use the command line to view the contents of the .jar file (or maybe Eclipse will let you do this). Next to PageFrame.class there should be a folder "images" and within it a folder "skillimages" and within that the image file. If not then your jar export has been seen up wrongly and is not including the required resource files.
(The "View" command is explained here: [http://java.sun.com/docs/books/tutorial/deployment/jar/view.html].)
Next check the case of the file names. On Windows getResource() will not worry about the cAsE of filenames so the resources will be located fine when running the program unjarred (including within Eclipse). But it does worry about the case of jar entry names. Bottom line: keep the file names all lower case because you use them that way in the code.
Finally, in case it is a particular image resource that's causing the problem you could add some code to print out its name just before you try and create the icon.
for (int i = 0; i < skills.length;i++){
    System.out.println(
            "About to make icon from " + "images/skillimages/" + skillnames[i] + ".gif");
    ImageIcon icon = new ImageIcon(PageFrame.class.getResource(
            "images/skillimages/" + skillnames[i] + ".gif"));
    skills[i] = new JLabel("00",icon,JLabel.CENTER);
}

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hari wrote:
hello friends,
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