<AWT Dev> [10] Review request for 8155197: Focus transition issue

Alexey Ivanov alexey.ivanov at oracle.com
Wed Sep 27 20:45:42 UTC 2017

Hi Semyon,

You're right: the test does not fail for me too on Windows 10 using 
jdk10. At the same time, I can reproduce the problem using 
focus8Test.jar attached to the bug [1]. However, it's harder to 
reproduce the issue using jdk10 or jdk9. It takes more attempts than 
with jdk8.

I could reproduce the problem on Windows 7 and Windows 10.

However, if I switch the theme to Windows Basic or Windows Classic in 
Windows 7, the issue cannot be reproduced any more. It looks as if it's 
related to window animation when a new dialog appears and disappears. If 
the dialog appears on the screen for a longer while, the test does not 
fail either.


[1] https://bugs.openjdk.java.net/browse/JDK-8155197

On 26/09/2017 23:46, Semyon Sadetsky wrote:
> Hi Dmitry,
> On 9/26/2017 1:56 AM, Dmitry Markov wrote:
>> Hi Semyon,
>> Please find my answer inline.
>> Thanks,
>> Dmitry
>>> On 25 Sep 2017, at 22:26, Semyon Sadetsky<semyon.sadetsky at oracle.com>  wrote:
>>> Hi Dmitry,
>>> On 09/25/2017 01:09 PM, Dmitry Markov wrote:
>>>> Hi Semyon,
>>>> This issue and the problem addressed by 8139218 and 8159432 are slightly different. This one is still reproducible on latest 9 and 10 builds using the test case attached to the bug or regression test provided with the fix.
>>> I couldn't get the test failed on 9 and 10. But I only tried it on Ubuntu. Is the issue a platform dependent?
>> I was able to reproduce the issue on Windows and Mac OSX. I didn’t test Linux, but I guess it is present there too.
>> Note: if you use VirtualBoxVM, it is necessary to enable 3D acceleration to reproduce the issue.
> Not sure that 3D may change focus behavior. But I did not uses 
> physical Ubuntu to test.
> I also couldn't get the test failed on Windows platform after 10 attempts:
> ssadetsk at SSADETSK-LAP1 /data/projects/client10/jdk
> $ for ((n=0;n<10;n++)); do `/data/jtreg/bin/jtreg 
> -jdk:../build/windows-x86_64-normal-server-fastdebug/jdk -nr 
> test/java/awt/Focus/FocusTransitionTest/FocusTransitionTest.java`; done
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
> Test: extra argument ‘passed:’
>>>> The problem takes place when we restore focus to a component and its parent window owns the focus. In this case we invoke doRestoreFocus(), (i.e. restore focus synchronously). If the parent window loses the focus during this invocation, focus request will fail and focus target will be shifted to next in focus traversal cycle. This case is not covered by the changes introduced by 8139218 and 8159432.
>>> I see. What may prevent to set the input focus synchronously? Since the native window already has the focus this should be very deterministic.
>> The native window loses focus if another window or dialog is displayed. Proposed fix is intended for the following case:
>> The native window owns focus and we set the focus to one of its child components synchronously, (i.e. invoke doRestoreFocus() -> requestFocus()). At the same time another window/dialog pops up, requestFocus() fails because the native parent window is not the focus owner any more and we shift focus target to next component.
> The requestFocus() calls the requestFocusHelper() which has several outcomes that returns "false". Which one of them should be involved?
> --Semyon

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