Twitter is well known for using Scala. Although the article says Java, I'd like to know if this is the case (i.e. no Scala) or a simplification. I've done more

Twitter is well known for using Scala. Although the article says Java, I'd like to know if this is the case (i.e. no Scala) or a simplification. I've done more Java programming than a man ought, and now a fair bit of Scala. The JVM is fast -- far faster than the Ruby/Python/PHP VMs. Harnessing that power has been an issue, as Java is so inexpressive. I find with Scala I can write code as quickly as in any other language I've used. It makes a great combination -- code quickly and get quick code -- and as a result I don't see any use for RoR or other interpreted frameworks in my coding.