Explanation/Reference:
The @Interceptors annotation can take an array of classes, so you can bind more than one class-level interceptor this way, e.g.
@Stateless
@Interceptors ({TracingInterceptor.class, SomeInterceptor.class})
public class EmailSystemBean
{
...
}
Reference: EJB Interceptors
http://docs.jboss.org/ejb3/app-server/tutorial/interceptor/interceptor.html