JOptionPane event blocking problem

Question

Hi,
JOptionPane is causing me a problem.
I have a simple frame that contains a text field and a button.
Pressing the button should write something to the standard output.
When the text field loses focus a JOptionPane in poped to the user.
The following scenario is problematic:
1. The text field owns the focus.
2. The user presses the button.
Expected result:
The JOptionPane appears due to the lost focus event on the text field.
After closing it some text is written to the standard output due to the action event on the button.
The actual result:
The JOptionPane does appears but after closing it nothing is written to the standard output. The button stays in a curious state (when the mouse hovers over the button the button looks pressed, and when the mouse doesn't hover over the button the button looks unpressed).
Probable reason for this behaviour:
The JOptionPane blocks all awt/swing events while it is opened. Some of the button code is perfomed due to the button press, but the ActionListener's actionPerformed method is not invoked.
I need the actionPerfomed method to be invoked.
Can anyone help me?
Here is the source code:
package test;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
public class Test {
public Test() {
public static void main(String[] args) {
//Test test1 = new Test();
final JFrame f = new JFrame("Test");
JButton b = new JButton("Click Here");
JTextField tField = new JTextField("Text", 10);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Button pressed!");
tField.addFocusListener(new FocusAdapter() {
public void focusLost(FocusEvent e) {
if (e.isTemporary()) return;
JOptionPane.showMessageDialog(f,
"Focus lost",
"Title",
JOptionPane.INFORMATION_MESSAGE);
JPanel content = (JPanel)f.getContentPane();
content.setLayout(new BoxLayout(content, BoxLayout.X_AXIS));
content.add(tField);
content.add(Box.createHorizontalStrut(5));
content.add(b);
f.pack();
f.show();
Thanks,
Shai

Answer 1

Hello Shai.
The JOptionPane seems to consume all events when its shown. (Check the stack after JOptionPane is shown.) I've solved a similar problem with the SwingUtilities.invokeLater() method. Maybe the following example will help:
Runnable doDlgError = new Runnable() {
public void run() {
JOptionPane.showMessageDialog(this, "Error", "Error",
JOptionPane.ERROR_MESSAGE);
SwingUtilities.invokeLater(doDlgError);
-Olaf