Gradle cannot infer scala class path despite the scala library being declared as a compile dependency

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Looks like you have a local Ivy repo whose artifact names don’t include the version. If you can’t change that, the Scala version cannot be inferred, and you’ll have to configure ‘scalaClasspath’ explicitly:

configurations {
    scalaCompiler
}
  dependencies {
      scalaCompiler "org.scala-lang:scala-compiler:2.10.3"
    // if you don't have a correct ivy.xml for scala-compiler,
     // you'll also have to declare the two other deps
}
  tasks.withType(ScalaCompile) {
    scalaClasspath = configurations.scalaCompiler
}

This solution doesn’t rely on deprecated elements such as ‘scalaTools’, and hence also works for 2.x.