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I'm new to Scala and don't know what the problem is however I've been compiling "fat jars" which include all the required libs.

I've been using https://github.com/sbt/sbt-assembly to do this successfully.

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Despite what your manifest is telling you, when you run the application you either do not have the scala-library included in your class path or there's some confusion when you attempt to import List. Scala should automatically import the immutable collection classes in your project with the root Predef implementation.

Predef provides type aliases for types which are commonly used, such as the immutable collection types scala.collection.immutable.Map, scala.collection.immutable.Set, and the scala.collection.immutable.List constructors (scala.collection.immutable.:: and scala.collection.immutable.Nil). The types Pair (a scala.Tuple2) and Triple (a scala.Tuple3), with simple constructors, are also provided.

Predef in core Scaladocs

Try printing the classpath from within your app to confirm.

Although not pertinent to your question, I would recommend using SBT for dependency management now that IntelliJ IDEA 13 has full SBT integration support. Your collaborators not using IntelliJ will also be happier because SBT gives them more options for build technologies, editors, and other tooling when working on the project.


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