Name: rmT116609 Date: 03/10/2004


FULL PRODUCT VERSION :
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b32c, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
The method JComboBox.removeAllItems() now triggers ActionListeners for the JComboBox. In previous versions, this wasn't the case. I could not find any documentation stating that this change was intended, so I'm not sure if it's a bug or intentional. Code that worked under 1.4.1 and versions previous might be broken under 1.4.2 if an actionPerformed() dereferences getSelectedItem() without a null check.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run RemoveAllTest under 1.4.1 & 1.4.2. The actionPerformed() method is invoked under 1.4.2 but not 1.4.1.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Not sure, I guess I don't understand why removing the items constitutes an 'action'.
ACTUAL -
Calling removeAllItems() fires an action event.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.event.*;

public class RemoveAllTest {

  public static void main(String[] args) {
    final JComboBox combo = new JComboBox();
    combo.addItem("one");
    combo.addItem("two");
    combo.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
        System.out.println(
          "combo actionPerformed()...getSelectedItem(): "
          +combo.getSelectedItem());
      }
    });
    combo.removeAllItems();
  }
}
---------- END SOURCE ----------
(Incident Review ID: 241501)
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