Oracle 12c is mentioned in 2 parts.[1]

~~~
5.1. Unsupported Features
Databases and Database Connectors
MySQL 5
Oracle 12c
PostgreSQL 10
EnterpriseDB Postgres Plus Advanced Server 10
SQL Server 2016

5.2. Deprecated Features
Databases and Database Connectors
Oracle 12c
~~~

[1] CHAPTER 5. UNSUPPORTED AND DEPRECATED FUNCTIONALITY
https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.3/html/7.3.0_release_notes/unsupported_and_deprecated_functionality