There is a Java driver and even an object mapper based off jackson - https://www.arangodb.org/drivers

This seems to be a mongodb clone with some extra features added on to make it a bit closer to a relational db, I guess. Looks interesting but likely suffers from the same problems MongoDB suffers from (data safety, scaling difficulties, etc)

EDIT: Have to say, the idea of a mongodb database with graph operations built in is pretty attractive for small network oriented problems...