Running the Advanced Contexts and Dependency Injection Examples - The Java EE 6 Tutorial: Advanced Topics - page 298

public @interface Logged {
}
The LoggedInterceptor class looks like this:
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@Logged
@Interceptor
public class LoggedInterceptor implements Serializable {
...
public LoggedInterceptor() {
}
@AroundInvoke
public Object logMethodEntry(InvocationContext invocationCon-
text)
throws Exception {
System.out.println("Entering method: "
+ invocationContext.getMethod().getName() + " in
class "
+ invocationCon-
text.getMethod().getDeclaringClass().getName());
return invocationContext.proceed();
}
}
The class is annotated with both the @Logged and the @Interceptor annotations.
The @AroundInvoke method, logMethodEntry , takes the required Invoca-
tionContext argument, and calls the required proceed method. When a method is
intercepted, logMethodEntry displays the name of the method being invoked as well
as its class.
To enable the interceptor, the beans.xml file defines it as follows:
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<interceptors>
<class>billpayment.interceptor.LoggedInterceptor</class>
</interceptors>