How to use java libraries with scala using sbt?

Question

So, I have a project written in Scala for Spark. The current sbt file looks like this.

name := "MyProgram"

version := "1.0"

scalaVersion := "2.10.4"

libraryDependencies += "org.apache.spark" %% "spark-core" % "1.1.0"

Say, I want to use external java libraries, and all those libraries are in a directory lib . How should I modify the sbt file to include those libraries?

Answer 1

Sbt should auto include all jars inside the lib folder.

Dependencies that are just floating around in the lib folder (rather than declared in your build.sbt file) are called unmanaged dependencies

Answer 2

As a use case example of unmanaged dependencies (as mentioned by Dominic) add these patterns in build.sbt ,

unmanagedBase <<= baseDirectory(_ / "./java-libs")

unmanagedClasspath in Compile +=
    file(System.getenv("EXTRA_LIBS_HOME")) / "java-libs/package.jar"