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    <p>Here an updated version of your code which works</p> <pre><code>import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JProgressBar; import javax.swing.SwingWorker; public class SwingTesting { public static void main(String[] args) { EventQueue.invokeLater( new Runnable() { @Override public void run() { JFrame frame = new JFrame(); JButton button = new JButton(); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { new GuiWorker().execute(); } }); button.setText("Test Me"); frame.getContentPane().add(button); frame.pack(); frame.setVisible(true); } } ); } } class GuiWorker extends SwingWorker&lt;Integer, Integer&gt; { /* * This should just create a frame that will hold a progress bar until the * work is done. Once done, it should remove the progress bar from the dialog * and add a label saying the task complete. */ private JFrame frame = new JFrame(); private JDialog dialog = new JDialog(frame, "Swingworker test", true); private JProgressBar progressBar = new JProgressBar(); public GuiWorker() { progressBar.setString("Waiting on time"); progressBar.setStringPainted(true); progressBar.setIndeterminate(true); dialog.getContentPane().add(progressBar); dialog.pack(); dialog.setModal( false ); dialog.setVisible(true); } @Override protected Integer doInBackground() throws Exception { System.out.println( "GuiWorker.doInBackground" ); Thread.sleep(1000); return 0; } @Override protected void done() { System.out.println("done"); JLabel label = new JLabel("Task Complete"); dialog.getContentPane().remove(progressBar); dialog.getContentPane().add(label); dialog.getContentPane().validate(); } } </code></pre> <p>Key point is that setting a model dialog visible blocks until the dialog is disposed. So making it non-modal fixed it + the <code>validate</code> call on the content pane when you switch components. I also adjusted your main method to run on the EDT, and added some System.out calls. If you remove the <code>setModal( false )</code> call you will see those statements are not printed until you close the dialog</p>
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    1. POHow do I make my SwingWorker example work properly?
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    1. USRobin
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    1. COThank you for pointing that out! I guess I should have looked to see whether there was a `setModal` method in the first place. I also took note the change in main, thank you for pointing that out. I just read about it here: http://java.sun.com/developer/technicalArticles/javase/swingworker/ I do have one issue with it though, by changing Modal to false, it allows the user to click the button more than once.
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      1. USWilliamShatner
    2. CO@WilliamShatner: there's no need to make the dialog non-modal. Simply display the dialog after starting the SwingWorker. This can be done either from the calling class, the one executing the SwingWorker, by first calling execute, and then showing the dialog, or it can be done from the SwingWorker, but if from the latter, you'll have to make your own pseudo-execute method that calls super's execute, and then shows the dialog. Note that you can't override `execute()` itself since it's final.
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      1. USHovercraft Full Of Eels
    3. CO@WilliamShatner you can disable the button when you start the SwingWorker, and re-enable it afterwards
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