how to return subgraph from gremlin that is in an easily consumable format for Java

Question

I am very frustrated about very simple things when I try to do a single traversal and bring a lot of stuff from DSE Graph 5.0 at once using Gremlin..

In my simplifie

Answer 1

If Entity:Type is a 1:n relationship, then you won't even need optional().

g.V().has("Entity","uuid","6708ec6d-4518-4159-9005-9e9d642f157e").
  project("entity","types").by().by(outE("IsOfType").fold())

The result will be of type List<Map<String, Object>>.

UPDATE

Following the short toList() discussion in the comments below, this is how you can work with a traversal result without storing the whole thing in a collection:

g.V().has("Entity","uuid","6708ec6d-4518-4159-9005-9e9d642f157e")
        .project("entity","types").by().by(outE("IsOfType").fold())
        .forEachRemaining(m -> {
            final Vertex entityV = (Vertex) m.get("entity");
            final List<Edge> typeE = (List<Edge>) m.get("types");
            // whatever ...
        })