Oracle ojdbc5 driver on Oracle 12c

We have a third party application which uses Java 1.5.x, ojdbc5 and Oracle 11g. We cannot change the Java version so cannot change the jdbc driver. We need to upgrade to Oracle 12c.
Has anyone seen any issues with using ojdbc5 against an Oracle 12c database. We have verified that there is nothing in the app that would prevent us from using Oracle 12c as all the underlying code uses plain SQL, but don't want to come up with some hidden jdbc issue.
Eric GoldbergEnterprise System ArchitectAsked:
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Usually they work over one oracle release, sometimes even further (protocol has not changed since introduction of RAC in DB version 9)
I'd pick latest ojdbc5 designed for 11gR2 and stay closer to supported side of things.
JDK 5 is EOL in 1 month , so take a chance to ask them to rebuild for java 8

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