FULL PRODUCT VERSION :
java version "1.5.0_08"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_08-b03)
Java HotSpot(TM) Client VM (build 1.5.0_08-b03, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]


A DESCRIPTION OF THE PROBLEM :
Under the following circumstances an added ListSelectionListener of a JList indicates ListSelectionEvents that should not be reported:

- The JList uses a DefaultListModel object as model
- The used DefaultListModel object contains data
- The selcted itemIndex is set to 0
- DefaultListModel.clear() is called

If these preconditions are met in this order a ListSelectionEvent is reported on each call of DefaultListModel.addElement( Object obj ).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and execute the sample code

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Output on stdOut:
selectedIndex before clear(): -1 numberOfEvents: 0
selectedIndex before clear(): 0 numberOfEvents: 2
selectedIndex before clear(): 1 numberOfEvents: 2
selectedIndex before clear(): 2 numberOfEvents: 2
ACTUAL -
Output on stdOut:
selectedIndex before clear(): -1 numberOfEvents: 0
selectedIndex before clear(): 0 numberOfEvents: 5
selectedIndex before clear(): 1 numberOfEvents: 2
selectedIndex before clear(): 2 numberOfEvents: 2

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.JList;
import javax.swing.DefaultListModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class BugDemo {

public final static String[] DATA = new String[] { "one", "two", "three" };
public static int numberOfEvents;

public static void main( String[] args ) {
JList list = new JList();
list.addListSelectionListener( new ListSelectionListener() {
public void valueChanged( ListSelectionEvent e ) {
++numberOfEvents;
}
});

for( int i=-1; i<DATA.length; i++ ){
DefaultListModel model = new DefaultListModel();
list.setModel( model );
addData( model, DATA );
numberOfEvents = 0;
list.setSelectedIndex( i );
model.clear();
addData( model, DATA );
System.out.println( "selectedIndex before clear(): "+i+" numberOfEvents: "+numberOfEvents );
}
}

private static void addData( DefaultListModel model, Object[] data ){
for( int i=0; i<data.length; i++ ){
model.addElement( data[i] );
}
}
}

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

CUSTOMER SUBMITTED WORKAROUND :
Set the index manually to anything > 0 and set it back afterwards. Setting it to -1 does not work.