Trying to cross compile a project to Scala 2.11 fails with “error while loading Object, Missing dependency 'object scala in compiler mirror'”

Question

I\'m trying to compile my project to Scala 2.10 and 2.11 so that I can release versions for both scala versions, but every time I try to do it it fails with the following me

Answer 1

I was getting this error when trying to use the Oracle Java 9 jvm on Ubuntu with sbt. Using the Java 8 jvm worked for me, though.

Answer 2

In Build.scala I would add autoScalaLibrary := true:

lazy val common = Project(
    id = commonName,
    base = file(commonName),
    settings = Configuration.baseSettings ++ Seq(
      ...
      autoScalaLibrary := true,
      ...
    )
  )

Answer 3

The problem is very simple, in your Build.scala, you did almost all right, but in commons project you had overridden default commonDependencies. By default it contains dependency to scala-library.

This piece of code

lazy val common = Project(
    id = commonName,
    base = file(commonName),
    settings = Configuration.baseSettings ++ Seq(
      name := commonName,
      libraryDependencies := Configuration.commonDependencies // #1
    )
  )

at the element marked as #1 should have

libraryDependencies ++= Configuration.commonDependencies

Ps. I've sent you a pull request with the fix.

Answer 4

I think you answered before your questions Multimodule project build with SBT breaks with weird error

In this build add a line "org.scala-lang" % "scala-library" % projectScalaVersion,:

 val commonDependencies = Seq(
    ..
    "org.joda" % "joda-convert" % "1.5",
    "org.scala-lang" % "scala-library" % projectScalaVersion,
    "io.netty" % "netty-all" % "4.0.18.Final",
    ...
  )

Answer 5

This problem was solved for me when using intellij, by closing the project and reimporting it, and selecting sbt as the build system in settings.

Why oh why did I choose SBT?? Now I'm stuck with a very brittle build system. Thank God that atleast intellij does it right.

sbt version: 0.13.15

scala version: 2.12.1