It runs OK in Eclipse but not able to run as .jar file
Question
I am writing a math program. Everything runs fine in Eclipse, but when I export them as .jar file. It did not run. When I double clicked on the .jar file, nothing happened. Here is a screenshot of my directory. Please help.
Here are steps to export .jar file:
File->Export->JAR file(under java), click Next. In the JAR File Specification, select "TestingMath", and then select: Export all output folders for checked projects. Export Java source files and resources. Export refactorings for checked projects.
Browse to Desktop for destination.
Then click finish.
package math;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.util.Random;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.border.Border;
import javax.swing.border.CompoundBorder;
public class Testing extends JFrame implements ActionListener
{
/**
*
*/
private static final long serialVersionUID = 1L;
JLabel lblQuestion;
JLabel lblImage;
JButton bOK;
JButton bExit;
JPanel radioPanel;
JPanel panBottom;
JRadioButton[] radioButton;
String [] store ;
ButtonGroup bg;
JButton bNext;
JPanel mainPanel;
JPanel pRight;
JLabel lblCorrect;
JLabel lblWrong;
int vCorrect = 0;
int vWrong = 0;
JScrollPane scroll;
public Testing()
{
//mc = mathCombine;
//mc.setVisible(false);
mainPanel = new JPanel(new BorderLayout());
buildingGUI();
//listAllFiles();
innitializeAllComponents();
URL url = getClass().getClassLoader().getResource("files/" + 1 + ".txt");
String strQuestion = readTextFile(url.toString(), 1);
store = strQuestion.toString().split("!!!");
lblQuestion.setText("<html>" + store[0] + "</html>");
//I need to get the image and display at the center according
//to the fileNumber
getTheImageAndDisplay(1);
assignRandomNumberToRadioButton(store[1]);
mainPanel.add(lblQuestion, BorderLayout.NORTH);
mainPanel.add(radioPanel, BorderLayout.WEST);
mainPanel.add(panBottom, BorderLayout.SOUTH);
mainPanel.add(scroll, BorderLayout.CENTER);
mainPanel.setPreferredSize(new Dimension(640, 480));
this.getContentPane().add(mainPanel);
}
private void getTheImageAndDisplay(int fileNumber)
{
// TODO Auto-generated method stub
System.out.println("fileNumber for ismage: " + fileNumber);
lblImage.setIcon(new ImageIcon(Testing.class.getResource("/images/" + fileNumber + ".png")));
//scroll = new JScrollPane(lblImage);
}
private void assignRandomNumberToRadioButton(String sAnswer)
{
// TODO Auto-generated method stub
int number = Integer.parseInt(sAnswer.toString().trim());
//System.out.println("number: " + number);
Random random = new Random();
int rand = random.nextInt(4); //This is the number of radioButton.
//System.out.println("rand is: " + rand);
System.out.println("Answer issss: " + sAnswer);
radioButton[rand].setText(sAnswer);
if(!radioButton[0].getText().equals(""))
{
radioButton[1].setText("" +( number + 2));
radioButton[2].setText("" + (number - 2));
radioButton[3].setText("" + (number + 1));
}
else if(!radioButton[1].getText().equals(""))
{
radioButton[0].setText("" +( number + 2));
radioButton[2].setText("" + (number - 2));
radioButton[3].setText("" + (number + 1));
}
else if(!radioButton[2].getText().equals(""))
{
radioButton[1].setText("" +( number + 2));
radioButton[0].setText("" + (number - 2));
radioButton[3].setText("" + (number + 1));
}
else if(!radioButton[3].getText().equals(""))
{
radioButton[1].setText("" +( number + 2));
radioButton[2].setText("" + (number - 2));
radioButton[0].setText("" + (number + 1));
}
}
/**
* Construct GUI.
*/
private void buildingGUI()
{
lblImage = new JLabel();
lblImage.setHorizontalAlignment(JLabel.CENTER);
scroll = new JScrollPane(lblImage);
bNext = new JButton("Next");
lblQuestion = new JLabel();
bOK = new JButton("OK");
bExit = new JButton("Exit");
lblQuestion.setFont(new Font("Tahoma", Font.PLAIN, 12));
radioPanel = new JPanel();
panBottom = new JPanel();
panBottom.setLayout(new GridLayout(1, 2));
panBottom.add(bOK);
panBottom.add(bExit);
bg = new ButtonGroup();
radioPanel.setLayout(new GridLayout(4, 1));
radioButton = new JRadioButton[4];
radioButton[0] = new JRadioButton();
radioButton[1] = new JRadioButton();
radioButton[2] = new JRadioButton();
radioButton[3] = new JRadioButton();
radioPanel.setLayout(new GridLayout(10, 1));
radioPanel.add(radioButton[0]);
radioPanel.add(radioButton[1]);
radioPanel.add(radioButton[2]);
radioPanel.add(radioButton[3]);
radioPanel.add(new JLabel());
radioPanel.add(new JLabel());
radioPanel.add(new JLabel());
radioPanel.add(bNext);
radioPanel.add(new JLabel());
radioPanel.add(new JLabel());
bg.add(radioButton[0]);
bg.add(radioButton[1]);
bg.add(radioButton[2]);
bg.add(radioButton[3]);
pRight = new JPanel();
pRight.setLayout(new GridLayout(5, 2));
lblCorrect = new JLabel();
pRight.add(lblCorrect);
lblWrong = new JLabel();
pRight.add(lblWrong);
pRight.add(new JLabel(" "));
pRight.add(new JLabel(" "));
mainPanel.add(pRight, BorderLayout.EAST);
}
private int generateRandomNumber()
{
// TODO Auto-generated method stub
Random random = new Random();
int rand = random.nextInt(20); //This is the number of Files in the system.
return rand;
}
private void innitializeAllComponents()
{
// TODO Auto-generated method stub
CompoundBorder border;
Border raisedbevel = BorderFactory.createRaisedBevelBorder();
Border loweredbevel = BorderFactory.createLoweredBevelBorder();
border = BorderFactory.createCompoundBorder( raisedbevel, loweredbevel);
lblQuestion.setFont(new Font("Tahoma", Font.PLAIN, 18));
lblQuestion.setBorder(BorderFactory.createLineBorder(Color.GREEN));
lblQuestion.setBorder(border);
radioPanel.setBorder(border);
pRight.setBorder(border);
panBottom.setBorder(border);
radioButton[0].setFont(new Font("Tahoma", Font.BOLD, 16));
radioButton[1].setFont(new Font("Tahoma", Font.BOLD, 16));
radioButton[2].setFont(new Font("Tahoma", Font.BOLD, 16));
radioButton[3].setFont(new Font("Tahoma", Font.BOLD, 16));
lblCorrect.setFont(new Font("Tahoma", Font.BOLD, 14));
lblCorrect.setForeground(Color.BLUE);
lblCorrect.setHorizontalAlignment(JLabel.CENTER);
lblWrong.setFont(new Font("Tahoma", Font.BOLD, 14));
lblWrong.setForeground(Color.red);
lblWrong.setHorizontalAlignment(JLabel.CENTER);
bNext.addActionListener(this);
}
@SuppressWarnings("resource")
private String readTextFile(String fileName, int fileNumber)
{
// TODO Auto-generated method stub
StringBuilder stringBuilder = new StringBuilder();
BufferedReader reader = null;
try
{
Random random = new Random();
//int rand = random.nextInt(20);
URL url = getClass().getClassLoader().getResource("files/" + fileNumber + ".txt");
File file = new File(url.toURI());
try
{
reader = new BufferedReader(new FileReader(file));
String line = null;
stringBuilder = new StringBuilder();
String ls = System.getProperty("line.separator");
try
{
while(( line = reader.readLine()) != null )
{
stringBuilder.append(line);
stringBuilder.append(ls);
}
}
catch(IOException e)
{
e.printStackTrace();
}
}
catch(IOException e)
{
e.printStackTrace();
}
}
catch(Exception e)
{
e.printStackTrace();
}
return stringBuilder.toString();
}
@Override
public void actionPerformed(ActionEvent ae)
{
// TODO Auto-generated method stub
if(ae.getSource().equals(bNext))
{
//if nothing selected, display a message,
//else: get the answer and display.
if(!radioButton[0].isSelected() && !radioButton[1].isSelected() &&
!radioButton[2].isSelected() && !radioButton[3].isSelected())
{
JOptionPane.showMessageDialog(this,"Please select an Answer.", "Nothing selected",
JOptionPane.OK_OPTION);
return;
}
else //when user select an answer.
{
String strAnswer = "";
if(radioButton[0].isSelected())
{
strAnswer = radioButton[0].getText().trim();
}
else if(radioButton[1].isSelected())
{
strAnswer = radioButton[1].getText().trim();
}
else if(radioButton[2].isSelected())
{
strAnswer = radioButton[2].getText().trim();
}
else if(radioButton[3].isSelected())
{
strAnswer = radioButton[3].getText().trim();
}
if(strAnswer.equals(store[1].trim()))
{
String strCorrect = lblCorrect.getText();
if(strCorrect.equals(""))
{
strCorrect = "0";
}
vCorrect = Integer.parseInt(strCorrect);
vCorrect = vCorrect + 1;
lblCorrect.setText("" + vCorrect);
playSound("correct");
}
else
{
String strWrong = lblWrong.getText();
if(strWrong.equals(""))
{
strWrong = "0";
}
vWrong = Integer.parseInt(strWrong);
vWrong = vWrong + 1;
lblWrong.setText("" + vWrong);
playSound("wrong");
}
int fileNumber = generateRandomNumber();
URL url = null;
String file = "files/" + fileNumber + ".txt";
url = this.getClass().getClassLoader().getResource(file);
String strQuestion = readTextFile(url.toString(), fileNumber);
store = strQuestion.toString().split("!!!");
lblQuestion.setText("<html>" + store[0] + "</html>");
clearTextInAllRadioButtons();
assignRandomNumberToRadioButton(store[1]);
getTheImageAndDisplay(fileNumber);
}
}
}
private void playSound(String sound)
{
// TODO Auto-generated method stub
try
{
URL url = null;
if(sound.equals("correct"))
{
url = this.getClass().getClassLoader().getResource("sound/ding.wav");
}
else if(sound.equals("wrong"))
{
url = this.getClass().getClassLoader().getResource("sound/buzz.wav");
}
AudioInputStream audioIn = AudioSystem.getAudioInputStream(url);
// Get a sound clip resource.
Clip clip = AudioSystem.getClip();
// Open audio clip and load samples from the audio input stream.
clip.open(audioIn);
clip.start();
}
catch (UnsupportedAudioFileException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
catch (LineUnavailableException e)
{
e.printStackTrace();
}
}
private void clearTextInAllRadioButtons()
{
// TODO Auto-generated method stub
radioButton[0].setText("");
radioButton[1].setText("");
radioButton[2].setText("");
radioButton[3].setText("");
bg.clearSelection();
}
public static void main(String[] s)
{
Testing mr = new Testing();
mr.pack();
mr.setVisible(true);
}
}
3 answers
solution1
6 2013-06-28 19:08:19
Create a META-INF/MANIFEST.MF file in the jar. Add the following entry to it:
Main-Class: your.main.Class
You can add this folder and file to the project, so it will be added to the jar automatically.
solution2
0 2013-06-28 20:58:30
You can run it from a console or a cmd window to see what's wrong.
if you are on windows, open a cmd window, then execute:
java -jar /path/to/the/jar.jar
This way, it should output some errors or exceptions, and make everything easier.
I hope you find this usesful. :)
If you get a class not found error or something like that, you should do what the above answers suggest, creating a MANIFEST.MF and adding your main class.
solution3
0 2015-02-08 21:44:31
I know it is late but the problem is with the resources you use in Eclipse for example if you have an image named (Image1.png ) and you can it in eclipse with getResource(....."image.png" ) one single letter can cause the problem and jar not run.But in eclipse it will run without any problem.So check the names of resources you use and also something other use(/) i have faced the same problem because of a sigle(/) i had(//)!!
Here must be the problem
URL url = getClass().getClassLoader().getResource("files/" + 1 + ".txt");
Missing a single(/)
URL url = getClass().getClassLoader().getResource("/files/" + 1 + ".txt");
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