I believe the '1 JVM = 10 Thins' remark you link to refers to the amount of servers they needed to run. Not the amount of code. Also Thin is a Ruby webserver, not Scala nor Java.

If the Computer Language Benchmark is any reference, 10 lines of Java ~= 8 lines of Scala : http://benchmarksgame.alioth.debian.org/u64q/benchmark.php?t...

And 10 lines of Scala ~= 6 lines of Ruby : http://benchmarksgame.alioth.debian.org/u64q/benchmark.php?t...

There's a pretty dramatic performance drop noted going from Scala to Ruby though.

(or 10:8:5 Java:Scala:Ruby if you wish)