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From: Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: standalone swing application runtime reload class
Date: Fri, 24 Jul 2015 14:11:09 -0400
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On 7/24/2015 12:35 PM, mcheung63@gmail.com wrote:
> Hi
>     JRebel can reload classes running on tomcat. How about standalone app? how can i real time reload it?
> thanks

     1) It can probably be done.

     2) You probably don't want to.

     For (1), I think you'd use a new ClassLoader to load the new
version of the class; this is allowed because classes loaded by
different ClassLoaders are different classes, even if they happen
to have the same package and class names.  Then you'd get rid of
all the instances of the old class (JFrames, JPanels, whatever)
and replace them with instances of the new one.

     For (2), note that (1) requires a Whole Lot of Extra Work on
your part, and you'll spend a lot of time writing and debugging it.
In that time, you could have closed the old app and launched the
new one a few hundred times at least.

     ... but it's possible I've underestimated the importance of
keeping "the same" app running.  What is the app like, and why do
you think reload-on-the-fly would be helpful?

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM