MongoDB 3 brings a new authentication support SCRAM-SHA-1 and deprecated MONGODB-CR.

The support came with Java's driver 2.13 but requires some migrations https://github.com/mongodb/mongo-java-driver/releases/tag/r2.13.0

• Upgrade to Java's driver 2.13
• replace the default MongoDBProperties.AUTHENTICATION_MECHANISM from MONGODB-CR to SCRAM-SHA-1 (and add the latter in AuthenticationMechanismType)
• write in the migration guide how to explicitly set the auth mechanism for people with older MongoDB databases
• Change to use MongoCredential.html#createCredential instead of MongoCredential#createMongoCRCredential

That should do the trick.

The workaround according to Dean is to do

db.system.version.save(
{ "_id" : "authSchema", "currentVersion" : 3 }
)