Regarding the connection to MySQL v8, you need to replace the jdbc connector mysql-connector-java-5.1.30-bin.jar, located in c: \ Program Files \ AggreGate \ jar \ with the one in the attachment when the server is stopped and the client is closed.
Also in the URL to connect to the database you need to register:
jdbc: mysql: // {ip_address}: {port} / {database_name}?useLegacyDatetimeCode=false&serverTimezone=UTC&useSSL=false
AGG did not support SSL connection with DB yet.
If "ag.stderr - Loading class com.mysql.jdbc.Driver" INFO message in log, change jdbc class driver to "com.mysql.cj.jdbc.Driver"