Integrated: 8252446: Screen.getScreens() is empty sometimes

Kevin Rushforth kcr at
Wed Sep 16 19:03:20 UTC 2020

On Thu, 3 Sep 2020 15:18:06 GMT, Kevin Rushforth <kcr at> wrote:

> As noted in the bug report, we get a pair of change events every time the list of screens changes. First, a change is
> sent with an empty list of screens and then a change is sent with the new list of screens. This happens whenever a
> monitor is plugged in or unplugged. It also happens on Mac at application startup.  As noted in the bug the reason for
> this is because the `updateConfiguration` method makes two separate calls on the list of screens, `clear` and `addAll`,
> rather than calling `setAll`. The latter ensures that only a single change event is delivered.  I verified that before
> this fix, the example program attached to the bug works correctly after the fix.
> I wrote a unit test. It ends up being skipped on Windows and Linux since we don't get an initial change event. On Mac
> the test fails without the fix and passes with the fix.

This pull request has now been integrated.

Changeset: 13ab2cbd
Author:    Kevin Rushforth <kcr at>
Stats:     107 lines in 2 files changed: 2 ins; 103 del; 2 mod

8252446: Screen.getScreens() is empty sometimes

Reviewed-by: arapte, pbansal



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