Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying SPRING COOKBOOK
  • Table Of Contents Toc
  • Feedback & Rating feedback
SPRING COOKBOOK

SPRING COOKBOOK

By : Jerome Jaglale, Yilmaz
4 (3)
close
close
SPRING COOKBOOK

SPRING COOKBOOK

4 (3)
By: Jerome Jaglale, Yilmaz

Overview of this book

This book is for you if you have some experience with Java and web development (not necessarily in Java) and want to become proficient quickly with Spring.
Table of Contents (14 chapters)
close
close
13
Index

Making a class implement an interface at runtime using an introduction

An introduction allows us to make a Java class (we will refer to it as the target class) implement an interface at runtime. With Spring AOP, introductions can be applied only to Spring beans (controllers, services, and so on). In this recipe, we will create an interface, its implementation, and make a Spring controller implement that interface at runtime using that implementation. To check whether it's working, we will also add a before advice to the controller method to execute a method from the interface implementation.

Getting ready

We will use the aspect class defined in the Creating a Spring AOP aspect class recipe.

How to do it…

Here are the steps for using an introduction:

  1. Create the Logging interface:
    public interface Logging {
      public void log(String str);
    }
  2. Create an implementation class for it:
    public class LoggingConsole implements Logging {
    
      public void log(String str) {
        System.out.println(str...
Visually different images
CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
SPRING COOKBOOK
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon