So I just installed JRebel from ZeroTurnaround to try the trial out.
It’s nothing short of a revelation. It completely changes my typical workflow and saved me maybe about half an hour today. And I expect it’ll save me half an hour every single day.
Cas 
You’re mission, should you choose to accept it, is to now test XRebel and provide feedback.
It does look cool, but would you pay $365 per year for it??
That’s $1 to save 30 minutes of your time every day. I’d say it’s worth it.
I bought it last summer and it’s worth it. Just that. I will renew my license this year for sure.
Yep, I’m thinking I’ll definitely be buying it. Just not having to stop and restart the entire game and get to the same position I was in a minute before just because I wanted to override a method in some class is incredibly good. Every time I have to stop and restart the game I’m wasting about a minute. Now I can do everything just by editing it. Combined with my newfangled XML-file-watching and texture file watching stuff it means I literally fired up the game yesterday… and left it running all afternoon while I continued to code it. Just awesome.
Not sure that Xrebel is much use to me though
Cas
XRebel is for web apps. I’ll be creating a web app soon so I’ll try it out.
Thanks to this post princec, I’ll try out JRebel, never bothered to take a look at it before. Thanks!
And whats the difference from Eclipse?
You’re not limited to only modifying method bodies, if that’s what you mean. It’s also possible to jack in custom resource parsers (loading level data from json or whatever). Only used it for web development myself; very handy.
Aye, the ability to be able to alter anything and it seems the game just keeps running… just brilliant. It does come with a little overhead mind… the game does slow down a smidgen here and there to be able to do this. But nothing drastic in my case.
Cas
lthere is a blot post that describing how the hotswaping works