MongoDB config for Spring Boot - 'url' with and without authentication credentials - mongodb

Question

I want to make the application.yml work with and without username/password when running tests. My server needs the credentials but when I am on localhost I want it to work without an authentication and with the default settings. The spring profile ("integrationtest") should stay the same.
I have the following Spring Boot MongoDB config:
mongodb:
uri: mongodb://${mongodb_username:testuser}:${mongodb_password:testpassword}#${mongodb_ip:localhost}:${mongodb_port:27017}/testDB
If I remove the username and password I get this Error:
org.springframework.data.mongodb.UncategorizedMongoDbException: Exception authenticating MongoCredential{mechanism=SCRAM-SHA-1, userName='testuser', source='testDB', password=<hidden>, mechanismProperties=<hidden>}; nested exception is com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=SCRAM-SHA-1, userName='testuser', source='testDB', password=<hidden>, mechanismProperties=<hidden>}
Caused by: com.mongodb.MongoCommandException: Command failed with error 18 (AuthenticationFailed): 'Authentication failed.' on server localhost:27017. The full response is {"ok": 0.0, "errmsg": "Authentication failed.", "code": 18, "codeName": "AuthenticationFailed"}
How can I make it work with the same profile? Maybe there is a way with nested variables? Thank you.

Answer 1

A simple solution is to put the complete uri in a single variable, localhost works with the default config and the server specifies the uri at server start. The config looks like:
uri: ${mongodb_uri:mongodb://localhost:27017/testDB}
At server start override it with:
-Dmongodb_uri=mongodb://testUser:testPassword#example.com:27017/testDB