How to setup JPA with Oracle Database, Websphere 7 and RAD 8

I have been Browsing IBMs documentation but did not have any luck on the steps that need to be followed to get JPA setup and used.

So far i know that i have the libraries on my application as i can use the Persistence Api (javax.persistence.Persistence). I am not sure if i need to do any additional WebSphere setup. Have found a document with Derby database which looked promising but I need oracle (as I said I am not sure if there will be a huge difference)

Also how can i browse the objects (is there any eclipse / RAD plugin that i need to add or it comes by default)