BEA dev2dev portal published "Using the Spring AOP Framework with EJB Components" article. Though this may not be the most common usage of the Spring AOP and the Spring Framework itself it is illustrating how to apply basic AOP principles on existing business application. The same principles can be used for non-EJB components and even in non-web applications. Article also explain how custom AOP components (e.g. advices) can be tested in isolation, which makes test cases much more manageable.