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Joget DX supports MySQL 8 database out of the box, except if you use MySQL 8 "as Joget comes preinstalled with MariaDB drivers v2.5.0 to support MySQL 8 default caching_sha2_password " new authentication plugin instead of the older "mysql_native_password".
Read https://mysqlserverteam.com/upgrading-to-mysql-8-0-default-authentication-plugin-considerations/
Because Joget DX ships with MariaDB JDBC drivers, you will need to download and paste the latest MySQL JDBC driver into "[JogetRootFolder]\apache-tomcat-8.5.41\webapps\jw\WEB-INF\lib\".
Or you could download the latest "MariaDB Connector/J 2.5.4 Stable":https://downloads.mariadb.org/connector-java/2.5.4/ . FYI Joget DX ships with @mariadb-java-client-2.5.0.jar@.