I think you can replace this line by using the import from above
```
(:import [org.apache.commons.io FileUtils]
         [com.tinkerpop.blueprints Vertex Edge]
         [com.thinkaurelius.titan.core TitanKey TitanLabel]
         [com.thinkaurelius.titan.graphdb.types.vertices TitanKeyVertex])
```
and then you can just use "TitanKeyVertex" within the file