simoncor.net/content/post/rundeck_331_mysql.md

title	description	date
Rundeck 3.3.1 - MySQL connection	Rundeck	2020-08-12

Rundeck 3.3.1 updated its 'mysql-connector-java' dependancy to version 8.0.21 which renamed the   com.mysql.jdbc.Driver   classname to   com.mysql.cj.jdbc.Driver.

Reconfigure Rundeck accordingly:

/etc/rundeck/rundeck-config.properties

...
- dataSource.url = jdbc:mysql://localhost/rundeck?autoReconnect=true&useSSL=false
+ dataSource.url = jdbc:mysql://localhost/rundeck?serverTimezone=Europe/Amsterdam
...
- dataSource.driverClassName = com.mysql.jdbc.Driver
+ dataSource.driverClassName = com.mysql.cj.jdbc.Driver
+ dataSource.properties.autoReconnect = true
+ dataSource.properties.useSSL = false
...