<AWT Dev> <Swing Dev> Weird focus problem with JTextField

Clemens Eisserer linuxhippy at gmail.com
Mon Oct 8 06:45:19 PDT 2012

Hi Pavel,

As mentioned, the issue only exists on Linux.

Thanks, Clemens

2012/10/8 pavel porvatov <pavel.porvatov at oracle.com>:
> Hi Clemens,
> I can't reproduce the problem with your test case on 7u7 as well. The
> following info if from my java console:
> Java Plug-in 1.6.0_35
> Using JRE version 1.7.0_07-b32 Java HotSpot(TM) Client VM
> I used Chrome. Firefox 10.0.7 works as well. Tested OS is: Microsoft Windows
> [Version 6.1.7601]
> Regards, Pavel.
>> 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:
>>>> 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

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