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> The ability to edit programs while they were running and then see the changes nearly instantaneously after saving without restarting the program was fantastic.

This feature is news to me. That is, unless you're talking about using it with the jrebel plugin (and intellij can't really take credit for that). If this is not what you're referring to, do you have a link where I can learn more?



Sure:

http://www.jetbrains.com/idea/webhelp/reloading-classes.html

Mind you it's limited to the built-in method swapping that the JVM offers.

But you can get more; see also:

http://blog.jetbrains.com/idea/2013/07/get-true-hot-swap-in-...

It was more than sufficient for my needs.




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