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In this video :http://www.youtube.com/watch?v=BES9EKK4Aw4

Notch (minecraft's creator) is doing what he refers to as 'real-time debugging'. He's actually modifying the code and plays with the game at the same time without recompiling everytime.

Does anyone know what this is called or where I could get more information on how to achieve this? I've been looking around without any success!

Regards, Erwald

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This feature is called "hotswapping" and is supported by certain JVMs. The Eclipse IDE debugger is capable of hot-swapping your code in the debug (F11) mode. Eclipse can also auto-build your project once you save a modified file (AND hot-swap when running a debug build). Notch seems to be using exactly this technique.

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wiki.eclipse.org/FAQ_What_is_hot_code_replace%3F is a concise explanation of Eclipse's capabilities
Now that we are diving into details, this feature was enabled by the JPDA protocol in Java 1.4.2, it seems.
Thank you guys for your inputs! Yeah I'm actually using eclipse soo i sure will try this! Thanks you again!
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some IDE s are doing this ie: eclipse, netbeans, intellij idea etc.

however some changes requires recompiling (method addition or deletion etc.)

and what he using is probably eclipse.

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