EJB runtime context, dependency injection, and crosscutting logic - EJB 3 in Action - page 199

SayHelloInterceptor will be applied because the method is specifically annotated
to use it:
@Interceptors(SayHelloInterceptor.class)
@ExcludeDefaultInterceptors
@ExcludeClassInterceptors
public Order findOrderById(String id) { ... }
Now that you know how interceptors are implemented and how to specify them, we'll take
an in-depth look at the interceptor classes themselves and see them in action.
5.3.6. Interceptors in action
Let's implement a basic logging interceptor on BidServiceBean from chapter 2 . List-
ing 5.10 contains the code for the interceptor. The interceptor attached to the addBid()
method will print a log message to the console each time the method is invoked. In a real-
world application, this could be used as debugging information (and perhaps printed out
using java.util.logging or Log4J).
Listing 5.10. EJB business method interceptors