Classes in libraries not being picked up - scala

Question

I have various library dependencies in my build.sbt file
scalaVersion := "2.10.5",
libraryDependencies ++= Seq(
"org.scalatest" %% "scalatest" % "2.2.5" % "test",
"org.apache.spark" %% "spark-core" % "1.6.1" % "provided",
"commons-logging" % "commons-logging" % "1.2"
) map (_.excludeAll(
ExclusionRule(organization = "org.slf4j"),
ExclusionRule(organization = "log4j"),
ExclusionRule(organization = "javax.servlet")
)),
libraryDependencies ++= Seq(("org.slf4j" % "slf4j-log4j12" % "1.7.10")
.excludeAll(ExclusionRule(organization = "log4j"))),
libraryDependencies += "log4j" % "log4j" % "1.2.16" % "test",
I can see them in my external libraries in the project view.
However, the classes in the libraries are not being picked up in the Scala source files.
This is a sub module.
And the dependencies are declared in the parent, build.sbt. The code is in the child project.
I have tried:
Invalidating Caches / Restarts...
Deleting the .idea file and re-importing
Building project several times
Any help appreciated.

Answer 1

The dependencies needs to be explicitly added also in the subproject.
For example, in your build.sbt in the root folder of your project you can set:
val commonDependencies = Seq(
"commons-io" % "commons-io" % "2.5"
// other dependencies
)
val root = (project in file(".")).settings(
libraryDependencies ++= commonDependencies,
libraryDependencies ++= Seq(
// dependencies only for project root
)
)
val topWordsCounter = (project in file("top-words-counter"))
.settings(
libraryDependencies ++= commonDependencies,
libraryDependencies ++= Seq(
// dependencies only for the sub project project top-words-counter
)
)
Hope this helps