Hi,
In such scenarios, I would ensure that the classname 'com.denodo.vdp.jdbc.Driver' has been provided and the driver 'denodo-vdp-jdbcdriver.jar' has been used to establish the connection. You could refer to [**Access Through JDBC**](https://community.denodo.com/docs/html/browse/8.0/en/vdp/developer/access_through_jdbc/access_through_jdbc) section of Virtual DataPort Developer Guide for more information about leveraging the JDBC driver for Northbound connections.
For your scenario, you could check that the client application uses Java version 8 or higher to connect to the Denodo Platform 8.0. You could take a look at the Knowledge Base article **[Java versions supported by the Denodo Platform](https://community.denodo.com/kb/en/view/document/Java%20versions%20supported%20by%20the%20Denodo%20Platform)** for more information.
Further, you could take a look at the logs of IBM Infoshpere in case of debugging any errors during the connection.
Hope this helps!