I had success compiling a small-scale mixed Scala and Java project. scalac takes both .java and .scala sources without much fuss, in my experience. I think this is an area that's improved a lot since the author wrote about it.
53 karma · joined December 9, 2008
When I do Java webapp development in Eclipse, it compiles and hot-swaps my code in the background without requiring any restart or redeployments. Works pretty well.
I do have to restart occasionally because the hot-swapping has limitations, so that does slow things down a bit, but when you consider the time saved by having good compiler integration, then I don't think there's a big difference in productivity.
require 'http://example.com/somelib.rb, '7361c1132d2ada0e987080100cfff5c1645c5e7d'
http://open.blogs.nytimes.com/2009/01/08/introducing-the-con...