How can I change version of Scala that is used by Play, SBT and its plugins?

Question

Is it necessary to change version of Scala that is used by SBT and its plugins ?

I\'m using Play Framework 2.1.1-RC2. I want to create new project that will use Scala 2.

Answer 1

The ultimate goal of my experiments was to change version of Scala compiler used to build my project.

After multiple attempts I concluded that achieving it nicely not possible. I think it's something creators of Play Framework should address.

Setting scalaVersion to 2.10.1-local in Build.scala didn't help much. SBT seem to be going to Maven/Ivy and downloading pieces of 2.10.0 that I don't want. After compiling the app I get bunch of warnings about incompatible dependencies.

I think it happens because {PLAY_HOME}\framework\project\Build.scala has bunch of variable set to 2.10.0.

"Elegant" solution was to tell SBT I'm going to use local copy of Scala by setting following variables in Build.scala

scalaVersion := "2.10.1-local",
autoScalaLibrary := false,
scalaHome := Some(file("/Program Files (x86)/scala/"))

But still if I create IntelliJ IDEA configuration with play idea command resulting project needs some clean up, in particular:

• Scala facet references missing Scala 2.10.0 library.
• Module test3-build has dependency on missing Scala 2.9.2 library

I hope my experiments other people who are also learning Play and Scala.

Details are here: http://www.scala-sbt.org/release/docs/Howto/scala.html