If application has a JTextField, then when I start such application,
if mouse happens to point at the spot where the window of the application
will show up, then all JTextField(s) of this application will be
unavalable (can not get focus when clicking at JTextField) until I
point away from this application's window and click anywhere else on
the screen. After that I can go back to my application, make it active
(by either clicking on it, or pointing - depending on the Widnow
manager style I have selected - on Solaris) point and click at JTextField
and it will become active.
If at the moment when I start my application the mouse is not pointing
at the spot where my application will show up, then when I make my
application's window active, the JTextField will be able to get focus.