sbt Scalatest NoClassDefFoundError

Question

I am trying to run a test using sbt and I am being thrown the java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class .

My environment is: Unix , sbt , scalatest .

I have pointed the scalalibrary to the one which I installed instead of the IntelliJ plugin(which dint work either)

Project Build File

name := "PleaseGod"

version := "1.0"

scalaVersion := "2.11.5"

libraryDependencies += "org.scalatest" % "scalatest_2.11" % "2.2.1" % "test"

libraryDependencies += "org.seleniumhq.selenium" % "selenium-java" % "2.35.0" % "test"

libraryDependencies += "org.scala-lang.modules" % "scala-xml_2.11" % "1.0.1"

Please refer the following link for the project structure : http://imgur.com/iugBPD6

Answer 1

I hit this exact same problem after generating a scala project from a giter8 template ( fayimora/basic-scala-project listed here)

The problem was that the Scala version was 2.11.5 but the ScalaTest version was 2.10 . Contents for build.sbt :

scalaVersion := "2.11.5"

libraryDependencies ++= Seq(
    "org.scalatest" % "scalatest_2.10" % "2.2.1" % "test" withSources() withJavadoc(),
    "org.scalacheck" %% "scalacheck" % "1.12.1" % "test" withSources() withJavadoc()

After I changed it to "scalatest_2.11 it compiled and executed tests as expected.

I see that your configuration is using scalatest_2.11 so I suspect one of your other dependencies has a similar Scala version conflict?

I also added a project/build.properties file that explicitly set the sbt version to 0.13.8

sbt.version=0.13.8