On further inspection I suspect this is a bug.  The query:
FOR v, e IN 1..3 OUTBOUND 'persons/eve' GRAPH 'knows_graph' RETURN {v:v, e: 
e}
errors the java driver with a null pointer, whether I use a Map or 
BaseDocument

The equivalent query:
FOR v, e IN 1..3 OUTBOUND 'persons/eve' GRAPH 'knows_graph' RETURN {v: 
{"_key": v._key, "_id": v._id, "_rev": v._rev, "name": v.name}, e: {"_key": 
e._key, "_id": e._id, "_rev": e._rev, "_from":e._from, "_to":e. _to}}
works for both types.

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