<Swing Dev> Weird focus problem with JTextField

[Clemens Eisserer]

Hi Pavel,

Thanks for taking a look at the testcase.

The bug triggering the testcase seems to have been fixed between
jdk8b55 and jdk8b56, although I am still able to reproduce the issue
with jdk7u7. I tried to add a comment to the report, however it seems
that functionality has been disabled.
For me the issue showed up with Firefox, Chrome and Opera on Fedora-17
64-bit, regardless using the oracle plugin or icedtea-web. Appletview
works as expected, however.

Unfourtunatly, the real application which made me create this
self-contained testcase still runs into the problem ...


Thanks again, Clemens

>
>
> On 14.09.2012 3:36, Clemens Eisserer wrote:
>>
>> Hi Pavel,
>>
>> I was able to distill the problem to small, self-contained testcase,
>> which is available at: http://93.83.133.214/textfielddemo.zip
>> I've also created a short video, demonstrating the issue:
>> http://youtu.be/r1JDj5BuBOM
>>
>> The JTextField opens up a JPopupMenu on<ENTER>, which can be closed
>> by clicking the JButton it contains.
>> However, after the popup is hidden, no editing is possible unless
>> focus is toggled once between the browser and another window.
>>
>> Unfourtunatly the testcase only triggers the problem on Linux (tested
>> with jdk8+oracle plugin as well as openjdk7+icedtea-web both with
>> recent versions Firefox and Chrome), However, I've seen this issue
>> happen on Windows too when running the application I talked in the
>> first email.
>>
>> It would be great if you could have a look.
>>
>> Thank you in advance, Clemens
>>
>>
>> 2011/7/30 Pavel Porvatov<pavel.porvatov at oracle.com>:
>>>
>>> Hi Clemens,
>>>
>>>> Hi,
>>>>
>>>> I've developed a database applet where Swing widgets are connected to
>>>> RowSets using the SwingSet library (an old sourceforge project).
>>>> All queries are executed on the EDT, except for some background tasks
>>>> which sync with the UI using SwingUtilities.invokeLater().
>>>>
>>>> When running the application over high-latency connections (EDT is busy
>>>> for a few seconds), sometimes after a pending operation is finished I
>>>> can't
>>>> edit any JTextFields. The mouse-cursor changes when I move it over the
>>>> JTextField, but when I click into the JTextField the carret simply does
>>>> not
>>>> appear - everything else (JMenu, JButtons, ...) works as expected - so I
>>>> guess event delevery is still working as expected.
>>>> To make JTextField-editing work again, I have to transfer focus to
>>>> another
>>>> native window and back to the browser-window. A heavyweight JMenu makes
>>>> it
>>>> work again too, whereas a lightweight one doesn't help.
>>>>
>>>> Even worse, the problem does not manifest itself with low-latency
>>>> connections or when running as application.
>>>>
>>>> I am completly puzzled :/
>>>> Any idea what could be the problem, or where / what for I should start
>>>> looking?
>>>
>>> First of all it's not a good idea to keep the EDT thread busy for a long
>>> time and I think the best way is to rewrite application.  Could you
>>> please
>>> make a small separated application that emulates EDT blocking and shows
>>> the
>>> problem?
>>>
>>> Regards, Pavel