We're upgrading the database of an application which is on jdk 1.6. Is there any way to connect 1.6 app with oracle 12.2.0.4?
As I could see on official oracle site, the only version of ojdbc that 12.2.0.4 supports is ojdbc8 which requires jdk 8.
I think you meant "12.2.0.1" as I don't think "12.2.0.4" exists. Unless you have "11.2.0.4" in mind? Anyway you don't have to upgrade the JDBC driver. You can continue to use the old JDBC driver that supports JDK6. The "12.2.0.2" server will be compatible with the JDBC driver from "11.2" ojdbc6.jar.