Scala compiler issues in IntelliJ

1. scalac object scala.runtime in compiler mirror not found

scala.reflect.internal.MissingRequirementError: object scala.runtime in compiler mirror not found.

Solution:

In IntelliJ IDE,
File -> Settings -> Build,Execution,Deployment -> Scala Compiler -> select sub project -> Additional Compiler options: remove dependecyFile

2. Error:scalac: Error: assertion failed: List(object package$DebugNode, object package$DebugNode)

      java.lang.AssertionError: assertion failed: List(object package$DebugNode, object package$DebugNode)
       at scala.reflect.internal.Symbols$Symbol.suchThat(Symbols.scala:1678)
       at scala.reflect.internal.Symbols$ClassSymbol.companionModule0(Symbols.scala:2988)
       at scala.reflect.internal.Symbols$ClassSymbol.companionModule(Symbols.scala:2991)
       at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genClass(GenASM.scala:1371)




Solution: mvn clean compile, then rebuild.

Reference:

http://stackoverflow.com/questions/24165184/scalac-assertion-failed-while-run-scalatest-in-idea

http://apache-spark-user-list.1001560.n3.nabble.com/spark-github-source-build-error-td10532.html