FULL PRODUCT VERSION :
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
ver winxp home svc. pack 2

A DESCRIPTION OF THE PROBLEM :
When an item in joptionpane is doubleclicked, then [cancel] is clicked the value returned is NOT null, as it should be. Instead it is as if the user had selected the [ok] button because the returned value is not null.

Works fine when item is clicked only once!


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. double click item from joptionpane (list)
2. click cancel button or [x] from title bar.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Joptiondialog should return a null value when cancel button is clicked
ACTUAL -
joptionpane returns the item that was double clicked EVEN THOUGH cancel button was pressed after double clicking item

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.lang.reflect.Array;

import javax.swing.JFrame;
import javax.swing.JOptionPane;

class Test extends JFrame {

    public void showTestOptionDialog() {

        Object[] selectedItems = new Object[40];
        for (int i = 0; i < 39; i++) {
            selectedItems[i] = ("item :" + i);
        }
        String answer = (String) JOptionPane.showInputDialog(this,
                "Double click on selected item then click cancel",
                "Test Option Dialog", JOptionPane.WARNING_MESSAGE, null,
                selectedItems, selectedItems[0]);

        // if cancel clicked
        if (answer == null) {
            JOptionPane.showMessageDialog(null,
                    "Cancel clicked (answer should be null!), answer = " + answer,
                    null,
                    JOptionPane.INFORMATION_MESSAGE);
        
            
            System.out.println("Cancel clicked, answer = " + answer);
           // selectedItems = null;
            return;
            // else if OK clicked
        } else if (answer != null) {
            JOptionPane.showMessageDialog(null,
                    "OK clicked, answer = " + answer,
                    null,
                    JOptionPane.INFORMATION_MESSAGE);
            
            
            
            System.out.println("OK clicked, answer =" + answer);
        }
    }

    public static void main(String[] args) {
        Test test = new Test();
        test.showTestOptionDialog();
    }
}

---------- END SOURCE ----------