DefaultDesktopManager.activateFrame throws NPE on Mac OS X (Leopard)

We have a Swing app deployed via JNLP. The JNLP file specifies JRE 1.5+.
There is an error that occurs ONLY on Mac OSX desktops. When the user clicks in the open area of a frame, they get a NullPointerException. Stack looks like:
javax.swing.DefaultDesktopManager.activateFrame(DefaultDesktopManager.java:233)
apple.laf.CUIAquaInternalFramePane.mousePressed(CUIAquaInternalFramePane.java:203)
java.awt.Component.processMouseEvent(Component.java:5599)
javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
java.awt.Component.processEvent(Component.java:5367)
java.awt.Container.processEvent(Container.java:2010)
java.awt.Component.dispatchEventImpl(Component.java:4068)
java.awt.Container.dispatchEventImpl(Container.java:2068)
java.awt.Component.dispatchEvent(Component.java:3903)
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256)
java.awt.LightweightDispatcher.processMouseEvent(Container.java:3933)
java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866)
java.awt.Container.dispatchEventImpl(Container.java:2054)
java.awt.Window.dispatchEventImpl(Window.java:1791)
java.awt.Component.dispatchEvent(Component.java:3903)
java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
java.awt.EventDispatchThread.run(EventDispatchThread.java:110)I've been able to gather very little from the web on this, other than a recognition of the bug, with a partially-described solution that I don't understand.
If anyone has seen this problem, or has any helpful information, it would be greatly appreciated.
Pete

If the exception is otherwise harmless, you could "mask" it by simply using a custom DesktopManager that usually simply delegates to the default one. Untested code:
// Make your desktop pane use your new DesktopManager
JDesktopPane dp = new JDesktopPane();
DesktopManager newManager = new MyDesktopManager(dp.getDesktopManager());
dp.setDesktopManager(newManager);
class MyDesktopManager implements DesktopManager {
   private DesktopManager delegate;
   public MyDesktopManager(DesktopManager delegate) {
      this.delegate = delegate;
   public void activateFrame(JInternalFrame f) {
      try {
         delegate.activateFrame(f);
      } catch (NullPointerException npe) {
         // Swallow, log, or whatever you want
   // All other methods, simply delegate
}

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Changing the index from 0 to 1 did solve my problem. I realised looking at the
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Parag
Joe Weinstein <[email protected]> wrote:
>
>
Parag wrote:
I think I know what the problem is and is my mistake. The ResultSetMetaDatais
indexed from 1 and not 0.
Let me try that and I will let you know whether that solves my problem.
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Parag
"Parag" <[email protected]> wrote:
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Parag
Joe Weinstein <[email protected]> wrote:
Parag wrote:
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Applications Compatibility (2)

I am trying to do a migration transfer from an older Mac Pro, running Leopard, to a newer Mac Pro, running Lion. There is a step that asks for a "passcode" to proceed. I have no idea what that passcode is. It seems to want a numeric code.

I am trying to do a migration transfer from an older Mac Pro, running Leopard, to a newer Mac Pro, running Lion. There is a step that asks for a "passcode" to proceed. I have no idea what that passcode is. It seems to want a numeric code. Has anyone had this experience?

This general-purpose article gives detailed step-by-step instructions for using Migration assistant, Setup Assistant, and other mehtods, and discusses the Pros and cons of each mtheod. It is very approachable and easy to understand. Wriiten by Pondini, the resident Time Machine guru.
Setting-up a new Mac from an old one, its backups, or a PC

When I am re-installing the Mac OSX snow leopard onto an older Mac I run into the window that says select the disk where you want to install Mac OSX but nothing is there to select

I am trying to re-install the Mac OSX snow leopard onto an older I mac with a new hard drive. I run into the "select the disk "where you want to install Mac OSX but there is nothing in the window to select. Any advice?

After you install a new hard drive, you need to boot to another drive to initialize it to MAC OS Extended (journaled) format and create the partition(s) on the drive. You do this using Disk Utility. Otherwise, the mac operating install process doesn't see a formatted disk to install to.

DefaultDesktopManager.activateFrame throws NPE on Mac OS X (Leopard)

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