Scala Type Safety with Tinkerpop Frames

Question

How can I use the type safety of Scala with Tinkerpop Frames' annotations?

This is the Java version example at https://github.com/tinkerpop/frames/wiki :

public interface Person {
  @Property("name")
  public String getName();

  @Adjacency(label="knows")
  public Iterable<Person> getKnowsPeople();

  @Adjacency(label="knows")
  public void addKnowsPerson(final Person person);

  @GremlinGroovy("it.out('knows').out('knows').dedup") //Make sure you use the GremlinGroovy module! #1
  public Iterable<Person> getFriendsOfAFriend()
}

The Property and Adjacency are simple enough.

But the traversal function is contained within a String so that Scala's type system cannot help.

I am using Gremlin-Scala (https://github.com/mpollmeier/gremlin-scala) to construct my traversals in Scala syntax. Maybe it can be used to further a solution.