Help! File in use problem when using Swing app

Question

Hi. I got a program that is pretty much a JFileChooser that prints to standard output the path of the file that I've chosen. If I invoke the DOS command:
java JFileChooserDemo, I will get the following as expected from the program:
"You chose a file named: C:\MyJava\Book.xls".
But if I invoke the following DOS command:
java JFileChooserDemo > output.txt, the file "output.txt" contains the following:
"GetModuleHandleA succeed
LoadLibrary returns baaa0000
You chose a file named: C:\MyJava\Book.xls"
So, if I try to open the file or try to modify "output.txt", I get an error message stating that the file is in use.
What's weird is that, I THINK if I have a program that DOES'NT use Swing or anything GUI-related and prints to standard output with the DOS "> outfile" command, I won't get this problem. So in other words, I can duplicate this problem with a sample Swing application that prints to standard output. Try it yourself.
In my original program, it does have an event handler that closes the JFileChooser and its container and exits the system via "System.exit(0);", but for some reason, something still has "locked" the output.txt file. I even did the ctr+alt+del and can't find anything that would lock the output.txt file. What's even weirder is that if I run the application again, but output to a different file like "output2.txt", this file is not locked, but the "output.txt" file still is. output2.txt also don't have contain the
"GetModuleHandleA succeed
LoadLibrary returns baaa0000" message.
The only way I know of that would "unlock" output.txt is to re-boot my computer.
So it seems I have to modify my program somehow because it appears the OS still thinks output.txt file is still in use.
Someone may think why would I invoke the java interpreter with the DOS "> outfile" command. Well, the reason being, I got a different version of the program that executes a query and I want it to create a delimited text file that contains the resultset of the query, so that I can then import it to Access, Excel, or whatever. But, because of this problem, I can't modify the query result without having to either run the application again and created another file name with the same result or re-boot. Of course, this would be silly.
Any help in how I can modify my program or any GUI-program so that if I invoke the DOS "> outfile" command, the outfile won't be "locked" would be greatly appreciated. Thanks. If you want my program, you can e-mail me or run any sample program from the Swing Tutorial that prints to standard output and just add the " > outfile" to the java interpreter command.
-Dan
[email protected]

Answer 1

Oops sorry, forgot to add the code. Here it is:
BTW, can I edit posts? Oh well...
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;
public class FileChooserDemo2 extends JFrame {
static private String newline = "\n";
public FileChooserDemo2() {
super("FileChooserDemo2");
//Create the log first, because the action listener
//needs to refer to it.
final JTextArea log = new JTextArea(5,20);
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
JButton sendButton = new JButton("Attach...");
sendButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser fc = new JFileChooser();
fc.addChoosableFileFilter(new ImageFilter());
fc.setFileView(new ImageFileView());
fc.setAccessory(new ImagePreview(fc));
int returnVal = fc.showDialog(FileChooserDemo2.this,
"Attach");
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
/** The next 2 lines I added, the rest of the code is original taken from the Swing Tutorial **/
System.out.println("You chose a file named: " +
                         fc.getSelectedFile().getPath());
log.append("Attaching file: " + file.getName()
+ "." + newline);
} else {
log.append("Attachment cancelled by user." + newline);
Container contentPane = getContentPane();
contentPane.add(sendButton, BorderLayout.NORTH);
contentPane.add(logScrollPane, BorderLayout.CENTER);
public static void main(String[] args) {
JFrame frame = new FileChooserDemo2();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.pack();
frame.setVisible(true);