Name: pa48320 Date: 02/11/2003

If the last item in a Jlist is selected and an item gets deleted from a listModel, in the intervalRemoved method of the ListDataListener, an exception will be thrown if getSelectedValue() is called on the Jlist. The exception is the following:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 >= 2
        at java.util.Vector.elementAt(Vector.java:427)
        at javax.swing.DefaultListModel.getElementAt(DefaultListModel.java:70)
        at javax.swing.JList.getSelectedValue(JList.java:1809)
        at JListSelectedValueTest.intervalRemoved(JListSelectedValueTest.java:36)
        at javax.swing.AbstractListModel.fireIntervalRemoved(AbstractListModel.java:160)
        at javax.swing.DefaultListModel.removeElementAt(DefaultListModel.java:313)
        at JListSelectedValueTest.<init>(JListSelectedValueTest.java:23)
        at JListSelectedValueTest.main(JListSelectedValueTest.java:41)

Here is a sample test app that demonstrates the problem:

import javax.swing.*;
import javax.swing.event.*;
public class JListSelectedValueTest extends JFrame implements ListDataListener {
   protected JList list;
   public JListSelectedValueTest()
   {
      DefaultListModel model = new DefaultListModel();
      model.addElement("one");
      model.addElement("two");
      model.addElement("three");

      list = new JList(model);
      JScrollPane pane = new JScrollPane(list);
      getContentPane().add(pane);

      setSize(400, 400);
      model.addListDataListener(this);
      list.setSelectedIndex(list.getModel().getSize() - 1);
      model.removeElement(0);
   }

   public void contentsChanged(ListDataEvent e)
   {
   }

   public void intervalAdded(ListDataEvent e)
   {
   }

   public void intervalRemoved(ListDataEvent e)
   {
      System.out.println(" list.getSelectedValue()="+(list.getSelectedValue()));
   }

   public static void main(String[] args)
   {
      JListSelectedValueTest test = new JListSelectedValueTest();
      test.setVisible(true);
   }
}

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