Defining an Aspect

In this lesson, we will define an aspect to intercept all the calls to the business layer and log their output. We will create a number of aspects and place all of them in a separate package.

When we intercept method calls, we have the option to perform tasks before the method is executed as well as afterwards. To define an aspect for a cross-cutting concern, we will perform the following steps:

1. Define aspect class.

2. Write methods containing the advice to be executed when method calls are intercepted.

3. Write pointcut expressions for intercepting method calls. ...