java-dev

Hi,

I've discovered a bad regression in Java 6 on Leopard (tested against
latest release, haven't checked in earlier java 6 releases).

Consider the following test case:

import javax.swing.*;
import java.awt.event.*;

public class Test {

   static class Element {
      public String toString() {
         return "test";
      }
   }
   public static final void main(String[] args)
   throws
   Exception {
      JFrame f = new JFrame();
      final JComboBox cb = new JComboBox(new Element[] {new Element()});
      cb.setSelectedIndex(0);

      cb.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent ae) {
              System.out.println("SELECTION: " + cb.getSelectedItem());
           }
      });
      f.getContentPane().add(cb);
      f.pack();
      f.setVisible(true);
   }
}

Run with:
/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Commands/java
-cp . Test

As you see this code creates a simple combobox with one element in it
(number of elements is not relevant).

Attempt to select the item from the drop down list: somehow the
selection is canceled and null is returned in the ActionListener iso
the item you actually tried to select. Attempt to select the item
again after the initial null, and now it works.

Creating a combobox model with a String iso another class does not
reproduce the same problem so it seems that something in the Aqua code
is explicitly assuming that comboxes created in this way will always
contains Strings as their elements.

All this works fine under Java 5 and works fine on Windows under Java 6 as well.

It seems there are quite a few bugs in the current Java 6 release - I
do hope Apple strongly considers releasing a quick patch for the many
reported issues. Or even better decides to contribute the GUI code to
Soylatte or OpenJDK so that the community can quickly address issues
like these.

Thanks,
- Filip
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