Earlier versions of Content Platform Engine worked
with JDBC version 3.0 drivers. Starting in the 5.2.1 release, a JDBC
4.0 driver is required.
Procedure
Check your JDBC driver version. If a JDBC 4.0 driver is
not already configured for use in your application server, you must
replace your existing JDBC drivers with a 4.0 version before you upgrade. For more information, see the instructions for configuring JDBC
drivers for your application server type.