When you create ADF BC REST application, JDeveloper creates REST Model and WebService projects. Technically speaking, if you have existing ADF application with Model and ViewController, you could add third project for REST Web Service by yourself. Two configuration files are required - web.xml and weblogic.xml (if ADF Security is enabled):
ADF BC REST is exposed to the client through ADF servlet. It doesnt work to enable ADF BC REST servlet in ADF Faces project web.xml. This requires to have separate WAR deployment for ADF BC REST and different context root.
For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.