How to get the TypeTag for a class in Java

Question

I\'m trying to call the functions.typedLit from Spark library in my other question. And it asks for two parameters, a literal object and its type (a TypeT

Answer 1

In your other question I said

and supplying the CanBuildFrom argument from Java is... technically possible, but not something you want to do.

Unfortunately, for TypeTag it's even less possible: unlike CanBuildFrom, they aren't supplied by a library, but built into Scala compiler.

The best advice I can give is to create a Scala file supplying the type tags you need to use from Java, since you only should need a limited number of them:

object TypeTags {
  val SeqInteger = typeTag[Seq[Integer]]
  ...
  // or 
  val Integer = typeTag[Integer]
  def Seq[A](implicit tt: TypeTag[A]) = typeTag[Seq[A]]
}

and then from Java TypeTags.SeqInteger or TypeTags.Seq(TypeTags.Integer).

In other places Spark provides special API for use from Java (look for .java packages), but I couldn't find one for functions.typedLit.