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...
I jumped on arango, looking for a small graphdb I could run locally on my machine. They've since moved it to a much wider scope. Turns out I abandoned that project idea (like most... :D), but I think Arango is sufficiently unique to merit more investment.
I chuckled at the absence of the most widely deployed language on the planet.
I dare say that there is a driver for Java - didn't look, because after browsing through a reasonable portion of their site, I still couldn't get a simple explanation of what this DB allegedly does and doesn't do.