Issue with jar file

Question

i've written a fairly simple app that involves a while loop. when i run the application using the command line, it works perfectly. however, if i bundle all the files up into a jar file and double click to run that, it gets most of the way through the while loop then appears to stop with no errors thrown or anything. here is the code:
import java.io.*;
import javax.swing.*;
public class ConvertImage
   public static void main (String[] args) throws IOException
      try
         UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
      catch (Exception e) {}
      JFrame frame = new JFrame ("Image Converter");
      frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
      JTextArea ta = new JTextArea (25, 60);
      frame.getContentPane().add (ta);
      frame.pack();
      ta.setText("Image Converter (c) T.Allen 2006\n");
      ta.append("--------------------------------------------------------\n");
      ta.append("\n");
      frame.show();
      JFileChooser chooser = new JFileChooser();
      int status = chooser.showOpenDialog (null);
      while (status == JFileChooser.APPROVE_OPTION)
         File file = chooser.getSelectedFile();
         // Open ID text entry
         String[] details = InputFrame.showInputDialog();
         if(!details[0].equals(null))
             // Run image conversion
             resizeImage ri = new resizeImage();
             ri.resize(file.getPath(), details[0]);
         // Add confirm message to JTextArea ta
         ta.append("Image converted successfully for product :"+details[0]+"\n");
         status = chooser.showOpenDialog (null);
}the app seems to get through to just before the line:ta.append("Image converted successfully for product :"+details[0]+"\n");then nothing. the program does not stop responding as i am able to shut it down using the red x button and the image output is correct as well. it seems really odd that it works fine until i stick it together as a jar file!
here is the command i use to create the jar file:
jar cmf ConvertImage.mf Convert.jar ConvertImage.class InputFrame.class InputFrame$1GetData.class resizeImage.class copyright.jpg images
and my manifest file looks like this:
Manifest-Version: 1.0
Main-Class: ConvertImage
(there is a blank line at the end of the manifest file.)
Does anyone know why the jar file isn't working as it should?

Answer 1

public static void main (String[] args) throws IOExceptionSo if something in the program throws an IOException, the program ends abnormally. But you should see the stack trace of the exception in your console.
But if you don't have a console (and you probably don't) then you don't see the stack trace.
Declaring your main method like that is okay for quick and dirty command-line programs where you can't be bothered to catch exceptions because you're going to throw the code away anyway. But if you're going to put the code in a jar file then you need a more professional standard of programming. Catch the exceptions in the program and notify the user when they occur.