In Denodo, I am able to use the JDBC driver with the openJDK. Although the openJDK can be used, I need to use Java 8 for Denodo 7 and Java 11 for Denodo 8. This issue could be related to having the wrong version of java installed. For an overview of the JDBC connections check out the [Access Through JDBC](https://community.denodo.com/docs/html/browse/8.0/en/vdp/developer/access_through_jdbc/access_through_jdbc#) section Virtual DataPort Developer Guide.
If you have a valid support user account, please open a new support case at support.denodo.com so that the support team can review these issues in detail.
Hope this helps!