The EJB 3.0 spec defines the ability to apply custom made interceptors to the business methods of your session and message driven beans (and of course to the JBoss @Service and @Consumer beans). EJB 3.0 interceptors take the form of methods annotated with the @javax.ejb.AroundInvoke annotation. This JavaPolis talk by Bill Burke covers this part of the EJB3 spec.
EJB3 Interceptors
