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POFrame displayed with InvokeLater after all other processes are done
 

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    <p>I'm afraid that this one is a little tricky since I couldn't recreate the issue in the example I wrote for this question (the example below works perfectly). Hopefully someone may have a clue as to possible problems with the actual application. I wrote a app with performs several long text operations. Each operation is done in its own thread. There is a Frame that is updated by the threads to let a user see how everything is progressing.</p> <p>The problem is that the frame is displayed with all the updates that were sent to it only after all the threads are done with their jobs.<br> I've simplified the entire app into the code below but as I said the problem is that it works here. Any ideas are very welcome.</p> <pre><code>import java.awt.BorderLayout; import java.awt.EventQueue; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class Main { private MyFrame frame; private ExecutorService executorService; public static void main(String[] args) throws InterruptedException { Main main = new Main(); main.startProcess(); } public void startProcess() throws InterruptedException { // Initialize the frame frame = new MyFrame(); EventQueue.invokeLater(new Runnable() { public void run() { frame.setVisible(true); } }); // Initialize executorService for 3 threads and also 6 runnables executorService = Executors.newFixedThreadPool(3); MyRunnable runnable; for(int i = 0; i &lt; 6; i++) { runnable = new MyRunnable(this, i); executorService.execute(runnable); } // Start runnables executorService.shutdown(); // Wait until all runnables are executed while (!executorService.isTerminated()) { Thread.sleep(10000); } // When all runnables are done close the frame EventQueue.invokeLater(new Runnable() { public void run() { frame.setVisible(false); } }); } // Update the frame display public synchronized void updateDisplay(final String update) { EventQueue.invokeLater(new Runnable() { public void run() { frame.updateDisplay(update); } }); } private class MyFrame extends JFrame { private JPanel contentPane; private JLabel lblDisplay; public MyFrame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); contentPane = new JPanel(); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); lblDisplay = new JLabel("Display"); contentPane.add(lblDisplay, BorderLayout.CENTER); pack(); } public void updateDisplay(String update) { lblDisplay.setText(update); pack(); } } private class MyRunnable implements Runnable { private int id; private Main main; public MyRunnable (Main main, int id) { this.main = main; this.id = id; } @Override public void run() { for(int i = 0; i &lt; 3; i++) { main.updateDisplay("Runnable " + id + " stepped " + i + " times."); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } } } } } </code></pre>
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