This problem in previewing occurs regardless of the report or query we choose, though testing our connection to the database reveals a successful connection is made. Advanced Reporting itself works fine and we can use/edit reports as normal, but the problem is in previewing reports via Jaspersoft Studio.
This issue typically can occur if you haven't upgraded your Jaspersoft Studio client to use the new CA JDBC Adapters and/or version of the client corresponding to your Jaspersoft server version.