Error reported by a customer:

https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.3/html-single/getting_started_with_jboss_eap_for_openshift_container_platform/index#S2I-

If you go down a little ways to the subsection 'Adding Datasource Drivers' there is an example for the Postgres drivers.env file.

I believe that there is an error in the documentation for the value for the POSTGRES_DRIVER_NAME field. It says 'postgres' but I think it should be 'postgresql'. After changing that value, I was able to successfully upgrade JBoss.