JList.setSelectedValue(null, ...) doesn't do anything

Name: rmT116609 Date: 07/21/2004


FULL PRODUCT VERSION :
java version "1.4.2_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_01-b06)
Java HotSpot(TM) Client VM (build 1.4.2_01-b06, mixed mode)

java version "1.5.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b51)
Java HotSpot(TM) Client VM (build 1.5.0-beta2-b51, mixed mode, sharing)


FULL OS VERSION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
JList.setSelectedValue(null, ...) doesn't do anything

It would seem that the developer was trying to make the item get unselected with the following code: if(anObject == null) setSelectedIndex(-1);, found at the start of the public void setSelectedValue(Object anObject,boolean shouldScroll) method, however that code is not doing anything.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run code

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no item to be selected
ACTUAL -
the previously selected item is still selected

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;

public class Test {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    JList list = new JList(new Object[] {"1", "2", "3"});
    frame.getContentPane().add(list);
    System.out.println("Setting selected value to 1");
    list.setSelectedValue("1", true);
    System.out.println("Selected Value: " + list.getSelectedValue());
    System.out.println("Setting selected value to 2");
    list.setSelectedValue("2", true);
    System.out.println("Selected Value: " + list.getSelectedValue());
    System.out.println("Setting selected value to null");
    list.setSelectedValue(null, true);
    System.out.println("Selected Value: " + list.getSelectedValue());
    frame.setSize(500, 500);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
before calling list.setSelectedValue(object, ...); check the value of object and if it is null call clearSelection() instead.
(Incident Review ID: 218240)
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