You might be aware of my previous Session Timeout Post in Oracle ADF.
By default if timeout happens ADF don't give you any warning message unless enable it (Post by Frank Nimphuis explained) you send some request to server (like click on page) after timeout. Our requirement was to redirect the page to default home page automatically after 15 minutes of inactivity.
Note: We had Webcenter 11g PS2 Spaces application.
Download the sample code
More details in this video