This paper is written based upon WebCenter 220.127.116.11 (PS2). I will revisit this for WebCenter 18.104.22.168 (PS3) in the future
In a modern Enterprise 2.0 portal you will find the need to let 2 portlets communicate with each other. Because you are working with webcenter, the change is big you also are creating ADF portlets instead of normal JSP portlets.
Webcenter currently does not implement the JSR286 standard which describes how to communicate between portlets. Instead of JSR286, Oracle has chosen to implement their own system to build interportlet communication (IPC) using an extension on the portlet.xml called oracle-portlet.xml.
In the white paper below you will find the steps needed to create ADF portlets that can communicate with each other. It will describe how we can wire portlets together, both in design time and runtime.