Eclipse editor and dynamic .class/.jar reload at runtime?

This is a live video Notch programming 48h game so you might not see what I mean but here it goes.
Notch 48h Minicract live video

He is using Eclipse on Win7. When he is changing a code say color or XY offsets its seems many times he does not reload game instance. How is it happening?

See here:

http://www.java-gaming.org/index.php?topic=25075.0

Thx, I was trying to find similar topic but critical failed on search criteria. I need to study my Eclipse and redefine workflow after seeing how powerful hotswap actually is.