Answer by Juan-Carlos Garcia-Garavito

Despite the notes we still had issues, so below are the complementary steps we followed to complete the work.

1. Although the oracle client was updated, unfortunately the file in usr/sap/<SID>/SUM/sdt/data/jdbc/new/ojdbc6.jar did not get updated when the JAVA instance was started via STARTUP profile. We were expecting the sapcpe command to overwrite the occurrences of that file, but it did not.
2. We manually then copied ojdbc6.jar from the new oracle client into usr/sap/<SID>/SUM/sdt/data/jdbc/new, and after that the JAVA instance stated.
3. We also updated the oracle client in usr/sap/<SID>/SUM/sdt/data/kernel (DIR_CT_RUN does not point there).
4. We also updated the oracle client in usr/sap/<SID>/SUM/abap/exe (DIR_CT_RUN does not point there).

With that in place all was resolved.

Regards,

Juan