Book Image

Developing Java Applications with Spring and Spring Boot

By : Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov
Book Image

Developing Java Applications with Spring and Spring Boot

By: Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov

Overview of this book

Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The course is up made of three modules, each one having a take-away relating to building end-to-end java applications. The first module takes the approach of learning Spring frameworks by building applications.You will learn to build APIs and integrate them with popular fraemworks suh as AngularJS, Spring WebFlux, and Spring Data. You will also learn to build microservices using Spring's support for Kotlin. You will learn about the Reactive paradigm in the Spring architecture using Project Reactor. In the second module, after getting hands-on with Spring, you will learn about the most popular tool in the Spring ecosystem-Spring Boot. You will learn to build applications with Spring Boot, bundle them, and deploy them on the cloud. After learning to build applications with Spring Boot, you will be able to use various tests that are an important part of application development. We also cover the important developer tools such as AMQP messaging, websockets, security, and more. This will give you a good functional understanding of scalable development in the Spring ecosystem with Spring Boot. In the third and final module, you will tackle the most important challenges in Java application development with Spring Boot using practical recipes. Including recipes for testing, deployment, monitoring, and securing your applications. This module will also address the functional and technical requirements for building enterprise applications. By the end of the course you will be comfortable with using Spring and Spring Boot to develop Java applications and will have mastered the intricacies of production-grade applications.
Table of Contents (34 chapters)
Title Page - Courses
Copyright and Credits - Courses
Packt Upsell - Courses

Creating the Authentication microservice

We want to secure our microservices. Security is essential for microservices applications, especially because of the distributed characteristics.

On the microservices architectural style, usually, there is a service that will act as an authentication service. It means this service will authenticate the requests in our microservices group.

Spring Cloud Security provides a declarative model to help developers enable security on applications. There is support for commons patterns such as OAuth 2.0. Also, Spring Boot Security enables Single Sign-On (SSO).

Spring Boot Security also supports relay SSO tokens integrating with Zuul proxy. It means the tokens will be passed to downstream microservices.

For our architecture, we will use the OAuth 2.0 and JWT patterns, both integrate with Zuul proxy.

Before we do so, let's understand the main entities in OAuth 2.0 flow:

  • Protected resource: This service will apply security rules; the microservices applications, in...