<AWT Dev> [9] Review Request: JDK-8032960 Running forms URL throws NullPointerException in Javaconsole.

Petr Pchelko petr.pchelko at oracle.com
Thu Feb 27 06:18:20 PST 2014

Hello, Anthony.

You were right, in case the Toolkit thread has an AppContext we should invoke the updateProperties through invokeLater as the DesktopPropertyChangeSupport could invoke a propertyChangeListener directly.

Please see the updated fix here: http://cr.openjdk.java.net/~pchelko/9/8032960/webrev.01/

I've also added an automatic test, but it's quite complicated.

With best regards. Petr.

On 20.02.2014, at 12:45, Anthony Petrov <anthony.petrov at oracle.com> wrote:

> Hi Petr,
> The fire...() method is now invoked on the Toolkit thread, and I see that the Toolkit.DesktopPropertyChangeSupport.firePropertyChange() will fire the event on the current thread if the toolkit thread belongs to the current app context.
> The question is: are we 100% sure that on MS Windows the AWT Toolkit thread *never* belongs to a user app context? Even if we're running in an unusual threading mode (like the one for FX where we combine the EDT and the FX toolkit thread)?
> If this is so, meaning that we always only postEvent() from the T.DPCS.fire...() method on Windows, then I'm fine with the fix.
> --
> best regards,
> Anthony
> On 2/19/2014 3:29 PM, Petr Pchelko wrote:
>> Hello, AWT Team.
>> Please review the fix for the issue:
>> https://bugs.openjdk.java.net/browse/JDK-8032960
>> The fix is available at:
>> http://cr.openjdk.java.net/~pchelko/9/8032960/webrev.00/
>> The problem:
>> The Toolkit thread does not have an AppContext so we can't use EventQueue.invokeLater on it.
>> The solution:
>> Remove invokeLater. This is safe, because the updateProperties is thread safe. The result of this call is a post of a PropertyChangeEvent for each AppContext in the application.
>> The test:
>> Hard to create, because we can't synthesize the WM_SETTINGCHANGE event.
>> Thank you.
>> With best regards. Petr.

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