Getting Started with Spring 2.0
I just published a new how-to that guides you through the steps to set up a Spring 2.0 development environment in JDeveloper. It shows you how to set up a project to run one of the Spring samples, and in the process covers such topics as directory and application structure, libraries and Jar management as well as Ant integration.
Then it shows you some of the nice features that JDeveloper provides for Spring developers out of the box.
While this is specifically meant for the Spring framework - similar steps will probably get you going with any other 3rd-party framework in JDeveloper.
The how-to is here:
http://www.oracle.com/technology/products/jdev/howtos/1013/SpringwithJDev/index.html