The MongoClient constructor in Java currently has:

MongoClient(MongoClientURI uri)
MongoClient(List<ServerAddress> seeds, List<MongoCredential> credentialsList, MongoClientOptions options

The former allows connecting using a URI, which is standard and supported by all drivers, but doesn't support custom credentials per database.

Previously we had API like:

mongoClient.getDB(dbname).authenticate(...)

... authenticate seems to have been removed from the 3.x Java driver. But is still avail in other drivers (e.g. pymongo).

We've read:
http://mongodb.github.io/mongo-java-driver/3.2/driver/reference/connecting/authenticating/
https://docs.mongodb.org/manual/reference/connection-string/

But this seems to deal with single credentials for a Mongo instance.

What's the recommended way of using multiple database credentials with the Java driver?