Name: mf23781 Date: 10/01/98


Using the swingset example, select menu item ColorChooser, the file
chooser. Using the comboBox that says classes, select a disk drive
such as C: then on popup list, select a:, you should see the following
exception
Exception occurred during event dispatching:
java.lang.NullPointerException:
at com.sun.java.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.addItem(MetalFileChooserUI.java:709)
at com.sun.java.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.access$0(MetalFileChooserUI.java:686)
at com.sun.java.swing.plaf.metal.MetalFileChooserUI$3.propertyChange(MetalFileChooserUI.java:488)
at com.sun.java.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:154)
at com.sun.java.swing.JComponent.firePropertyChange(JComponent.java:2908)
at com.sun.java.swing.JFileChooser.setCurrentDirectory(JFileChooser.java:396)
at com.sun.java.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxAction.actionPerformed(MetalFileChooserUI.java:877)
at com.sun.java.swing.JComboBox.fireActionEvent(JComboBox.java:638)
at com.sun.java.swing.JComboBox.selectedItemChanged(JComboBox.java:660)
at com.sun.java.swing.JComboBox.contentsChanged(JComboBox.java:704)
at com.sun.java.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:82)
at com.sun.java.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.setSelectedItem(MetalFileChooserUI.java:745)
at com.sun.java.swing.JComboBox.setSelectedItem(JComboBox.java:369)
at com.sun.java.swing.JComboBox.setSelectedIndex(JComboBox.java:400)
at com.sun.java.swing.plaf.basic.BasicComboBoxUI.selectPreviousPossibleValue(BasicComboBoxUI.java:922)
at com.sun.java.swing.plaf.metal.MetalComboBoxUI.selectPreviousPossibleValue(MetalComboBoxUI.java:327)
at com.sun.java.swing.plaf.metal.MetalComboBoxUI$3.actionPerformed(MetalComboBoxUI.java:391)
at com.sun.java.swing.JComponent.processKeyBinding(JComponent.java:1521)
at com.sun.java.swing.JComponent.processKeyBindings(JComponent.java:1544)
at com.sun.java.swing.JComponent.processKeyEvent(JComponent.java:1446)
at java.awt.Component.processEvent(Component.java:2199)
at java.awt.Container.processEvent(Container.java:910)
at java.awt.Component.dispatchEventImpl(Component.java:1799)
at java.awt.Container.dispatchEventImpl(Container.java:955)
at java.awt.Component.dispatchEvent(Component.java:1731)
at java.awt.LightweightDispatcher.processKeyEvent(Container.java:1485)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1469)
at java.awt.Container.dispatchEventImpl(Container.java:942)
at java.awt.Window.dispatchEventImpl(Window.java:495)
at java.awt.Component.dispatchEvent(Component.java:1731)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:79)

======================================================================

daniel.indrigo@Canada 1998-10-26

More details from someone else.....


1.
Run the attached tiny program (without JIT to have more tracing information)
e.g.:

java -Djava.compiler= -classpath .;%classpath% FileChooserBug4

 /* Bug is simple: try to select A:\ drive from directory popup
 * in FileChooser dialog (with A: drive empty),
 * then reply (Ignore or Abort) on OS prompt dialog. Observe two things:
 * 1. The exception is thrown to the System.err.
 * 2. After clicking outside the opened Combo box it closes and
 * shows space place where current directory must be shown
 * whereas file panel shows files from previously selected
 * directory.
 * 3. Try to select A:\ again. No error dialog is displayed and
 * directory changes to A:\ as if it was selectable. The file
 * panel still shows files from previously selected directory. */
2.
-----------cut here-------
import javax.swing.JFileChooser;

public class FileChooserBug4
  {
  public static void main(String [] args) throws Throwable
    {
    int result = (new JFileChooser()).showOpenDialog(null);
    System.exit(0);
    }
  }
-----------cut here-------

3.
Exception occurred during event dispatching:
java.lang.NullPointerException:
        at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.addItem(MetalFileChooserUI.java:709)
        at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.access$0(MetalFileChooserUI.java:686)
        at javax.swing.plaf.metal.MetalFileChooserUI$3.propertyChange(MetalFileChooserUI.java:489)
        at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:154)
        at javax.swing.JComponent.firePropertyChange(JComponent.java:2915)
        at javax.swing.JFileChooser.setCurrentDirectory(JFileChooser.java:396)
        at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxAction.actionPerformed(MetalFileChooserUI.java:877)
        at javax.swing.JComboBox.fireActionEvent(JComboBox.java:638)
        at javax.swing.JComboBox.selectedItemChanged(JComboBox.java:660)
        at javax.swing.JComboBox.contentsChanged(JComboBox.java:704)
        at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:82)
        at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.setSelectedItem(MetalFileChooserUI.java:745)
        at javax.swing.JComboBox.setSelectedItem(JComboBox.java:369)
        at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:400)
        at javax.swing.plaf.basic.BasicComboPopup$ListMouseHandler.mouseReleased(BasicComboPopup.java:558)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:228)
        at java.awt.Component.processMouseEvent(Component.java:2355)
        at java.awt.Component.processEvent(Component.java:2200)
        at java.awt.Container.processEvent(Container.java:904)
        at java.awt.Component.dispatchEventImpl(Component.java:1809)
        at java.awt.Container.dispatchEventImpl(Container.java:949)
        at java.awt.Component.dispatchEvent(Component.java:1741)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:1739)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1537)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1453)
        at java.awt.Container.dispatchEventImpl(Container.java:936)
        at java.awt.Window.dispatchEventImpl(Window.java:491)
        at java.awt.Component.dispatchEvent(Component.java:1741)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:79)
4. See 3.
5. One floppy drive, 10 logical
drives on hard drive and network with sparsely
disribute letter names (C, D, E, G ...).
Swing version 1.1beta3 (new package names).