Re: Why does JDK 1.6 recommend creating Swing components on the EDT?

Lew <>
Tue, 01 Dec 2009 09:23:41 -0500
Roedy Green a ??crit :

On Mon, 30 Nov 2009 13:39:07 -0800, markspace<>
wrote, quoted or indirectly quoted someone who said :

Yeah, Sun fuggered up their earlier recommendation and had to take it
back. Everything goes on the EDT now.

The problem is threading bugs are very hard to reproduce and track
down. My putting everything onto the EDT thread, they avoid a large
number of headaches.

Albert wrote:

have you actually seen such a bug ? Something like corrupted data in a
swing model for example ? I've never triggered such a bug, even if i [sic] did
a lot of gui calls off the EDT.

I've never actually seen Roedy but I know he exists.

Have you tried running improperly-threaded Swing programs on a multiprocessor
machine? Millions of times?

It took Sun, with its knowledge of millions of Java programs and some of the
very best minds in the computer world working on Java, years to figure out
that their earlier advice regarding Swing and the EDT was wrong. That's why
the OP thought maybe that the new advice was specific to the latest version of
Java when it actually applies to all versions of Swing. .Net has the same

This is why professional computer programmers read a lot. We know that our
own personal experience is limited so we seek out the wider experience of the
community at large and follow industry best practices. We would rather learn
from others' wisdom than have an expensive, embarrassing and entirely
avoidable problem at the customer site.

"But that never happened to me before!" will be small comfort then.


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