I have created one extension (jar ) for rest services . In that Jar i am using org.hibernate.dialect.Oracle12cDialect for oracle . but APS is not running .throwing error "* Oracle12cDialect class not available*"
I don't think there is another way to use the 12C dialect without using the new hibernate libs. You can try to use them but at your own risk since they haven't been tested.
APS also uses hibernate Identity generation with the old libs.
The version of Hibernate used in APS is old and doesn't contain that dialect.