Why Scala Enumeration does not work in Apache Zeppelin but it works in maven - scala

Question

Enumeration works as expected when I use it in a maven project(with the same Scala version).
object t {
object DashStyle extends Enumeration {
val Solid,ShortDash = Value
}
def f(style: DashStyle.Value) = println(style)
def main(args: Array[String]) = f(DashStyle.Solid)
}
But when it runs in Apache Zeppelin(Zeppelin 0.6, Spark 1.6, Scala 2.10, Java 1.8)
object DashStyle extends Enumeration {
val Solid,ShortDash = Value
}
def f(style: DashStyle.Value) = println(style)
f(DashStyle.Solid)
It reports the following error even it says found and required type is exactly the same
<console>:130: error: type mismatch;
found : DashStyle.Value
required: DashStyle.Value
f(DashStyle.Solid)
Why and how should I use it?

Answer 1

I figured out the trick to solve this issue.
In Apache Zeppelin (or Scala REPL). In order to use Enumeration or sealed&object, it should be wrapped in object but not directly define on the root scope.
The reason why it works in maven is that I already put it into an object.
Define enumeration in an object in a Zeppelin paragraph
object t {
object DashStyle extends Enumeration {
val Solid,ShortDash = Value
}
def f(style: DashStyle.Value) = println(style)
}
Then use it in a Zeppelin paragraph
import t._
f(DashStyle.Solid)