And for those working in Scala and building with Maven still, I second the recommendation to download & run Ivy, turn on the useZincCompiler option in maven-scala-plugin's configuration, and enjoy substantially faster build times (and automatically falling back to a normal build if Zinc isn't running). You don't even need to specify a scala home directory for Zinc like it claims; scala-maven-plugin will tell Zinc to use the Scala libs from your Maven repo.