smashed it!!! so i put both jar files here -
/usr/share/tomcat/.guacamole/extensions/guacamole-auth-jdbc-mysql-0.9.14.jar /usr/share/tomcat/.guacamole/lib/mysql-connector-java-8.0.11.jar and my "guacamole.properties" looks like this - # MySQL properties mysql-hostname: localhost mysql-port: 3306 mysql-database: guacamole_db mysql-username: guacamole_user mysql-password: guacamole_pw thanks for your help in this much appreciated -- Sent from: http://apache-guacamole-general-user-mailing-list.2363388.n4.nabble.com/