Java MongoDbDriver FerretDb Auth Issue

This is a reproducer of an issue with the MongoDb Java Driver authentication with FerretDb 0.9.0.

1 - install sdkman

This helps installing java!

$ curl -s "https://get.sdkman.io" | bash

2 - install java 17

$ java install java 17.0.6-tem

3 - start FerretDb

$ docker compose up

4 - Run the test

$ ./mvnw clean test

Error with MongoDatabase.createCollection()

MongoDatabase.createCollection() fails with following message (even if not creating a capped collection)

Command failed with error 238 (NotImplemented): 'create: support for field "capped" is not implemented yet' on server localhost:27017. The full response is {"ok": 0.0, "errmsg": "create: support for field \"capped\" is not implemented yet", "code": 238, "codeName": "NotImplemented"}

Error with authentication (FIXED)

The error comes from SaslAuthenticator class of the java driver that tries to get the conversationId (a BsonInt32) from the Sasl response but does not find it!:

com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=PLAIN, userName='username', source='$external', password=<hidden>, mechanismProperties=<hidden>}
....
Caused by: org.bson.BsonInvalidOperationException: Document does not contain key conversationId