Cannot connect to MongoDB on localhost using JDBC

[steevej (Steeve Juneau)]

@c51a1608bd6dd1713da7ee458e75803

Doing a “db.system.users.find()” in the corpus_test database shows no users. Nothing displays.

Because there is not collection named system.users in the corpus_test database.

@c51a1608bd6dd1713da7ee458e75803

If I try to create a user there, I get the errors I posted above.

Because there is user named corpus in the corpus_test database. It’s _id is corpus_test.corpus as per your own post. So it fails because the user already exist.

@c51a1608bd6dd1713da7ee458e75803

_id: 'corpus_test.corpus',
  userId: UUID("3732b335-8734-4c15-b2f8-db2b2f0abb41"),
  user: 'corpus',
  **db: 'corpus_test',**
  credentials:

@c51a1608bd6dd1713da7ee458e75803

If I go to the admin database, db.system.users.find() shows the corpus_test user.

It doesn not show the corpus_test user but the user corpus of the corpus_test database. All users, even defined in another database are in the collection system.users of the admin database. The field named db of the user data indicates the authentication database.

@c51a1608bd6dd1713da7ee458e75803

If that is not correct

It is not correct since it does not work.

@c51a1608bd6dd1713da7ee458e75803

what database … should I use?

You should

use admin

@c51a1608bd6dd1713da7ee458e75803

what create user command should I use?

You createUser command seems the right one when executed after use admin.