How do I pass authentication with my java driver?

The doc page linked below shows two ways of passing authentication to your java driver.

The preferred method is to setup authentication in the application.conf using withCloudSecureConnectBundle. 

Note: Be sure that the application.conf is setup correctly and available on your application's classpath.

https://docs.datastax.com/en/developer/java-driver-dse/2.3/manual/core/authentication/