Book Image

Learning Spring Boot 2.0 - Second Edition

By : Greg L. Turnquist, Greg L. Turnquist
Book Image

Learning Spring Boot 2.0 - Second Edition

By: Greg L. Turnquist, Greg L. Turnquist

Overview of this book

Spring Boot provides a variety of features that address today's business needs along with today's scalable requirements. In this book, you will learn how to leverage powerful databases and Spring Boot's state-of-the-art WebFlux framework. This practical guide will help you get up and running with all the latest features of Spring Boot, especially the new Reactor-based toolkit. The book starts off by helping you build a simple app, then shows you how to bundle and deploy it to the cloud. From here, we take you through reactive programming, showing you how to interact with controllers and templates and handle data access. Once you're done, you can start writing unit tests, slice tests, embedded container tests, and even autoconfiguration tests. We go into detail about developer tools, AMQP messaging, WebSockets, security, and deployment. You will learn how to secure your application using both routes and method-based rules. By the end of the book, you'll have built a social media platform from which to apply the lessons you have learned to any problem. If you want a good understanding of building scalable applications using the core functionality of Spring Boot, this is the book for you.
Table of Contents (11 chapters)

Calling one microservice from another with client-side load balancing

Remember how we configured our Eureka Server earlier to run on a separate port? Every microservice has to run on a distinct port. If we assume the images service is our frontend (it has the Thymeleaf template, and is closest to consumers for serving up image data), then we can let it continue to run on Netty's default port of 8080.

That leaves one decision: what port to run the comments service on? Let's add this to the comments service's application.yml:

      port: 9000 

This setting instructs Spring Boot to run comments on port 9000. With that in place, let's go back to images, and make some adjustments.

For starters (Spring Boot starters), we need to add some extra things to the images build.gradle file: