I've run into an awkward regression with Tiger Beta2
around JFileChooser on Windows. It kicks in when you have
windows shortcuts on your desktop that reference network
filesystems that are currently unavailable.

I initially hit this on my home system. I have a desktop
shortcut to a network folder back at Sun. However that shortcut
only works when I am using VPN.

When I ran a small Java application that uses JFileChooser
it stalled for 20-30 second during startup and then put up
a dialog box saying:

    Problem with shortcut
    The Drive or network connection that the shortcut
    "kgh'(H).lnk' refers to is unavailable
    Make sure that the disk is properly inserted or the
    network resources is available, and then try again.

I clicked OK, and then got another long stall and another
similar dialog before my application was able to start.

Here is a backtrace from NetBeans of the main thread when
it was stalled:
    Win32ShellFolder2.getLinkLocation
    Win32ShellFolder2.getLinkLocation
    Win32ShellFolder2.isDirectory
    Win32ShellFolderManager2.get
    ShellFolder.get
    MetalFileChooserUI.updateUseShellFolder
    MetalFileChooserUI.installComponents
    BasicFileChooserUI.installUI
    MetalFileChooserUI.installUI
    JComponent.setUI
    JFileChooser.updateUI
    JFileChooser.setup
    JFileChooser.<init>
    JFileChooser.<init>
    GUI.<init>
    GUI.main

It looks like this problem is caused because we are trying to
access the shortcut.

I was able to reproduce a similar problem at work by:
   * inserting a CDROM
   * creating a short on my desktop to a file on the CDROM
   * removing the CDROM
   * running the four line progtam below:
   
   public class GUI {
      public static void main(String arv[]) throws Exception {
         new javax.swing.JFileChooser();
      }
   }

This problem was not present in 1.4.2.

I think the issue of having a bad desktop shortcut to a CDROM
will be fairly rare. However, I am concerned that it may be
somewhat common for people to have desktop shortcuts to network
fileystems that are sometimes unavailable. The effects of the
bug are fairly unpleasant in that they stall the application for
40-60 seconds and put up a couple of annoying dialogs.

I wouldn't mind getting stalled if either I or my application
was explicitly accessing the bad shortcut. But we weren't.
It was simply its presence on the desktop that caused the stall.

I suspect this bug is related to the fix for 4356160.
I was one of the people requesting that fix, but
unfortunately it may have caused this side-effect. :-(

###@###.### 2004-06-20