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No Display.getCurrent() when opening Swing Component [message #446929]

Mon, 06 December 2004 15:14

Florian Georg

Messages: 22
Registered: July 2009

Junior Member

Hello,

I have a (SWT based) GEF/draw2d Application which opens a JFrame on
Button Click (pure Swing, not SWT_AWT !)
Beside from strange effects like deadlocks when using the Clipboard if
the JFrame is opened modal, I've got one somehow fundamental error:

The JFrame is opened, causing some visuals "from behind" to be marked as
invalid. The asynchronous (GEF-) repaint manager triggers something like
a repaint event with "Display.getCurrent().asyncExec(....)", which
results in a NullPointerException...
Is there no current display, if some Swing component has the focus ?
It sound plausible, as the current thread is no SWT ui-thread...
but how can I work around this issue?
Changing the call into "Display.getDefault()" is no solution, as the
code is part of the GEF.

Any ideas ?

Thanks in advance
Florian

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Re: No Display.getCurrent() when opening Swing Component [message #446937 is a reply to message #446929]

Mon, 06 December 2004 17:40

Steve Northover

Messages: 1636
Registered: July 2009

Senior Member

Enter a bug report against GEF. Display.getCurrent() can return null.

"Florian Georg" <FGeorg@gmx.de> wrote in message
news:cp1t07$fka$1@www.eclipse.org...
> Hello,
>
> I have a (SWT based) GEF/draw2d Application which opens a JFrame on
> Button Click (pure Swing, not SWT_AWT !)
> Beside from strange effects like deadlocks when using the Clipboard if
> the JFrame is opened modal, I've got one somehow fundamental error:
>
> The JFrame is opened, causing some visuals "from behind" to be marked as
> invalid. The asynchronous (GEF-) repaint manager triggers something like
> a repaint event with "Display.getCurrent().asyncExec(....)", which
> results in a NullPointerException...
> Is there no current display, if some Swing component has the focus ?
> It sound plausible, as the current thread is no SWT ui-thread...
> but how can I work around this issue?
> Changing the call into "Display.getDefault()" is no solution, as the
> code is part of the GEF.
>
> Any ideas ?
>
> Thanks in advance
> Florian

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