RFR: 6603771: Nimbus L&F: Ctrl+F7 keybinding for Jinternal Frame throws a NPE.

Sergey Bylokhov serb at openjdk.org
Mon Dec 12 20:14:59 UTC 2022


On Fri, 9 Dec 2022 08:06:43 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> In Swingset2 JInternalFrame demo, focusing on any internalframes and pressing Ctrl+F7 and then any of up/down/left/arrow key to move the internal frames results in NPE in NimbusL&F.
> It is because `JComponent.processKeyBinding() `calls `SwingUtilities.notifyAction` which calls `BasicDesktopPaneUI.actionPerformed` where it gets `Desktop.minOnScreenInsets` property to get the Insets and then uses insets.top/bottom/left/right value to move the internalframe but this property is not defined for Nimbus so deferencing Insets object results in NPE.
> 
> Fix is added to create a 0 insets incase some L&F do not define` Desktop.minOnScreenInsets` property.
> No regression test is added as it can be easily checked by SwingSet2 JInternalFrame demo.

You can install the `UncaughtExceptionHandler` on EDT to catch that exception:

    public static void main(String[] args) throws Exception {
        EventQueue.invokeAndWait(
                () -> Thread.currentThread().setUncaughtExceptionHandler(
                        (t, e) -> System.out.println("Error?")));

-------------

PR: https://git.openjdk.org/jdk/pull/11605



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