title: How can I ignore scala library while sbt assembly
body: <p>I am using <code>sbt</code> to build my <code>scala</code> project.</p>
  
  <p>This is my <code>build.sbt</code>:</p>
  
  <pre><code>name := "My Spark App"
  version := "1.0"
  libraryDependencies += "org.apache.spark" %% "spark-core" % "1.2.0" % "provided"
  libraryDependencies += "org.apache.spark" %% "spark-sql" % "1.2.0" % "provided"
  </code></pre>
  
  <p>I am running <code>sbt assembly</code> to create an assembly jar, but I found a scala directory containing scala library class codes.</p>
  
  <p>Is it possible to take scala library as a <strong>provided</strong> dependency, since the run-time environment already contains scala?</p>