<Swing Dev> Weird focus problem with JTextField

[Clemens Eisserer]

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?

Thank you in advance, Clemens
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