With the FileChooserDemo, if you try to access the A: drive (floppy) and there's no floppy in the drive, exceptions are thrown. This occurs with swing-1.1beta2 (promoted 8/11/98) and JDK1.1.6.

Steps to Reproduce:
0) Launch FileChooserDemo with the configuration above.
1) Click Show FileChooser button.
2) Use the top ComboBox to select the A: drive.
RESULT: The following exceptions are thrown:
Exception occurred during event dispatching:
java.lang.NullPointerException
        at com.sun.java.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxMod
el.addItem(Compiled Code)
        at com.sun.java.swing.plaf.metal.MetalFileChooserUI$3.propertyChange(Com
piled Code)
        at com.sun.java.swing.event.SwingPropertyChangeSupport.firePropertyChang
e(Compiled Code)
        at com.sun.java.swing.JComponent.firePropertyChange(Compiled Code)
        at com.sun.java.swing.JFileChooser.setCurrentDirectory(Compiled Code)
        at com.sun.java.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxAct
ion.actionPerformed(Compiled Code)
        at com.sun.java.swing.JComboBox.fireActionEvent(Compiled Code)
        at com.sun.java.swing.JComboBox.selectedItemChanged(Compiled Code)
        at com.sun.java.swing.JComboBox.contentsChanged(Compiled Code)
        at com.sun.java.swing.AbstractListModel.fireContentsChanged(Compiled Cod
e)
        at com.sun.java.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxMod
el.setSelectedItem(Compiled Code)
        at com.sun.java.swing.JComboBox.setSelectedItem(Compiled Code)
        at com.sun.java.swing.JComboBox.setSelectedIndex(Compiled Code)
        at com.sun.java.swing.plaf.basic.BasicComboPopup$InvocationMouseHandler.
mouseReleased(BasicComboPopup.java:404)
        at java.awt.AWTEventMulticaster.mouseReleased(Compiled Code)
        at java.awt.AWTEventMulticaster.mouseReleased(Compiled Code)
        at java.awt.Component.processMouseEvent(Compiled Code)
        at java.awt.Component.processEvent(Compiled Code)
        at java.awt.Container.processEvent(Compiled Code)
        at java.awt.Component.dispatchEventImpl(Compiled Code)
        at java.awt.Container.dispatchEventImpl(Compiled Code)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Compiled Code)
        at java.awt.LightweightDispatcher.processMouseEvent(Compiled Code)
        at java.awt.LightweightDispatcher.dispatchEvent(Compiled Code)
        at java.awt.Container.dispatchEventImpl(Compiled Code)
        at java.awt.Window.dispatchEventImpl(Compiled Code)
        at java.awt.EventDispatchThread.run(Compiled Code)