RFR: 8293862: javax/swing/JFileChooser/8046391/bug8046391.java failed with 'Cannot invoke "java.awt.Image.getWidth(java.awt.image.ImageObserver)" because "retVal" is null'

[Tejesh R]

On Fri, 11 Nov 2022 08:18:19 GMT, Tejesh R <tr at openjdk.org> wrote:

> Observation found when JFileChooser is instantiated in WindowsLookAndFeel which invokes getSystemIcon() from WindowsFileChooserUI class. Could not find the exact root cause so predicting it to be an issue with icons not loaded where resolutionVariants map is empty in _public Image getResolutionVariant(double width, double height) _. Hence proposing a null check before accessing getWidth(). Fix is tested in CI system.

Based on the analysis and test runs, I have added a null check to return null when _ImageIcon_ is null and added to the map. The test is made as headful since the occurrence of issue seems to be dependent on machine and is unpredictable. Headful test didn't cause any issue after multiple runs and iterations.

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PR: https://git.openjdk.org/jdk/pull/11104