The last thing I know was they moved from Ruby to Scala. Did they move to Java without me noticing or do you mean Scala by Java (since it's a JVM language too)?

The last thing I know was they moved from Ruby to Scala. Did they move to Java without me noticing or do you mean Scala by Java (since it's a JVM language too)? EDIT: according to Wikipedia the service itself moved from Ruby to Scala while search moved from Ruby to Java.