AFAIK, jBPM is not certified anywhere other than JBoss when sold as a suite.
It is possible to run it under Weblogic 11g, as seen in https://community.jboss.org/wiki/JBPM52OnWeblogic11g. It might be possible to follow a similar process and get it running under Weblogic 12c, but you're probably on your own for the moment.