We have some case classes defined like so:

object VertexLabel {
  MyCCLabel = "com.example.domain.MyCC"
  // other vertex labels...
}

@label(VertexLabel.MyCCLabel)
case class MyCC(val foo: String) extends DomainRoot

Queries like this fail:
graph.V().hasLabel[MyCC]

The GremlinScala.hasLabel[CC <: Product: ru.WeakTypeTag]() implementation assumes that a literal string will be passed to the @label annotation (e.g. @Label("my.domain.Class")). It parses the annotation tree looking for a begin quote. In our case, we are instead passing a reference to a constant value.

I'll push up a PR with a fix.

@mpollmeier, Thank you again for your great work on this lib!!