I tried to connect to Denodo Platform 7.0 from JDBC Client like DBVisualizer and I was able to connect it successfully.
For this scenario, you could perform the following checks:
* In DBVisualizer, ensure to load the JDBC jar file in the Driver Manager. You could do this by navigating to **Tools > Driver Manager** and in the Driver Manager window, go to **Driver > Create Driver** and then, add the Denodo Platform 7.0 JDBC driver jar file (denodo-vdp-jdbcdriver.jar) which is located under the '<DENODO_HOME>/tools/client-drivers/jdbc' directory.
* Ensure to use the Driver Class name as **com.denodo.vdp.jdbc.Driver**
You can have a look at the [Connection using third party SQL clients](https://community.denodo.com/kb/view/document/Connection%20using%20third%20party%20SQL%20clients?category=Northbound+Connections) Knowledge Base article for further information.
Hope this helps!