Problem with Enter key and JOptionPane in 1.4

Question

Hi,
I had a problem with an application I was working on.
In this application, pressing [Enter] anywhere within the focused window would submit the information entered into the form that was contained within the frame.
The application would then try to validate the data. If it was found to be invalid, it would pop up a JOptionPane informing the user of that fact.
By default, pressing [Enter] when a JOptionPane is up will activate the focused button (in most cases, the [OK] button) thus dismissing the dialog.
In JDK 1.3 this worked fine. But in JDK 1.4, this has the result of dismissing the dialog and opping it up again. This is because the [Enter] key still works on the frame behind the JOptionPane and thus tries to validate it again, which results in another invalid dialog msg popping up.
The only way to get out is to use the mouse or the Esc key.
Now, in the application I put in a workaround that I was not very happy with. So, to make sure it wasn't the application itself, I created a test which demonstrates that it still misbehaves.
Here it is.
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.WindowConstants;
* @author avromf
public class FocusProblemTest extends AbstractAction
     private static JFrame frame;
     public FocusProblemTest()
          super();
          putValue(NAME, "Test");
     public void actionPerformed(ActionEvent e)
          JOptionPane.showMessageDialog(frame, "This is a test.");
     public static void main(String[] args)
          FocusProblemTest action= new FocusProblemTest();
          try
               UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
          catch (Exception e)
               e.printStackTrace();
          frame= new JFrame("Test");
          frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
          Container contents= frame.getContentPane();
          contents.setLayout(new FlowLayout());
          JTextField field= new JTextField("Test");
          field.setColumns(30);
          JButton  button= new JButton(action);
          KeyStroke enterKey = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true);
          button.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(enterKey, "test");
          button.getActionMap().put("test", action);
          contents.add(field);
          contents.add(button);
          frame.pack();
          frame.setVisible(true);
}Does anyone have any solution to this problem?

Answer 1

I know that focus management has changed alot.
Based on my experimentation a while back, in 1.4 it still believes that the JFrame is the window in focus, even though a JOptionPane is currently in front of it (unless I misinterpreted what was going on). Thus, the frame seems to get the keyboard event and re-invoke the action.
A.F.