I am using mySQL 8.0.16. jdbc:mysql://localhost:3306 worked for me.
The used account needs to have Authentication Type: Standard (caching_sha2_password doesn't seem to work).
Good luck!
Edit: After installation completion, I get a "HTTP Status 500 - The server encountered an internal error that prevented it from fulfilling this request." from Apache Tomcat. Is mySQL 8 incompatible?