Has something changed in latest 15.0.4 release with the database|datasource configuration?
I have dbs configured but chosen not to store the passwords with 'master password protection'. In earlier builds when I attempted to access the database for first time in a session IntelliJ would pop up a window asking for the DB username and password. After entering the password it would work fine.
But now instead of prompting for a password I get a failure events:
2:48:12 PM  Could not create connection to database server. Attempted reconnect 3 times. Giving up.
 Access denied for user 'dbuser'@'localhost' (using password: NO)
Seems it thinks no password is required? this isn't true and I cannot find a way to force the db auth prompt? i.e. switch to using password YES
Using IDEA 15.0.4 on CentOS 6 - only thing that changed was my IntelliJ version (patched from 15.0.3).