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Microservices with Spring Boot and Spring Cloud
Microservices with Spring Boot and Spring Cloud

Microservices with Spring Boot and Spring Cloud: Build resilient and scalable microservices using Spring Cloud, Istio, and Kubernetes , Second Edition

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Microservices with Spring Boot and Spring Cloud

PART I

Getting Started with Microservice Development Using Spring Boot

In this part, you will learn how to use some of the most important features of Spring Boot to develop microservices.

This part includes the following chapters:

  • Chapter 1, Introduction to Microservices
  • Chapter 2, Introduction to Spring Boot
  • Chapter 3, Creating a Set of Cooperating Microservices
  • Chapter 4, Deploying Our Microservices Using Docker
  • Chapter 5, Adding an API Description Using OpenAPI
  • Chapter 6, Adding Persistence
  • Chapter 7, Developing Reactive Microservices

Introduction to Microservices

This book does not blindly praise microservices. Instead, it's about how we can use their benefits while being able to handle the challenges of building scalable, resilient, and manageable microservices.

As an introduction to this book, the following topics will be covered in this chapter:

  • How I learned about microservices and what experience I have of their benefits and challenges
  • What is a microservice-based architecture?
  • Challenges with microservices
  • Design patterns for handling challenges
  • Software enablers that can help us handle these challenges
  • Other important considerations that aren't covered in this book

Technical requirements

No installations are required for this chapter. However, you may be interested in taking a look at the C4 model conventions, https://c4model.com, since the illustrations in this chapter are inspired by the C4 model.

This chapter does not contain any...

Introduction to Spring Boot

In this chapter, we will be introduced to how to build a set of cooperating microservices using Spring Boot, focusing on how to develop functionality that delivers business value. The challenges with microservices that we pointed out in the previous chapter will be considered only to some degree, but they will be addressed to their full extent in later chapters.

We will develop microservices that contain business logic based on plain Spring Beans and expose REST APIs using Spring WebFlux. The APIs will be documented based on the OpenAPI specification using springdoc-openapi. To make the data processed by the microservices persistent, we will use Spring Data to store data in both SQL and NoSQL databases.

Since Spring Boot v2.0 was released in March 2018, it has become much easier to develop reactive microservices, including non-blocking synchronous REST APIs. To develop message-based asynchronous services we will use Spring Cloud Stream. Refer to...

Creating a Set of Cooperating Microservices

In this chapter, we will build our first couple of microservices. We will learn how to create cooperating microservices with minimalistic functionality. In upcoming chapters, we will add more and more functionality to these microservices. By the end of this chapter, we will have a RESTful API exposed by a composite microservice. The composite microservice will call three other microservices using their RESTful APIs to create an aggregated response.

The following topics will be covered in this chapter:

  • Introducing the microservice landscape
  • Generating skeleton microservices
  • Adding RESTful APIs
  • Adding a composite microservice
  • Adding error handling
  • Testing the APIs manually
  • Adding automated tests of microservices in isolation
  • Adding semi-automated tests to a microservice landscape

Technical requirements

For instructions on how to install tools used in this book and how...

Deploying Our Microservices Using Docker

In this chapter, we will start using Docker and put our microservices into containers!

By the end of this chapter, we will have run fully automated tests of our microservice landscape that start all our microservices as Docker containers, requiring no infrastructure other than a Docker engine. We will have also run a number of tests to verify that the microservices work together as expected, and finally shut down all the microservices, leaving no traces of the tests we executed.

Being able to test a number of cooperating microservices in this way is very useful. As developers, we can verify that the microservices work on our local developer machines. We can also run exactly the same tests in a build server to automatically verify that changes to the source code won't break the tests at a system level. Additionally, we don't need to have a dedicated infrastructure allocated to run these types of tests. In the upcoming chapters...

Adding an API Description Using OpenAPI

The value of an API, such as a RESTful service, depends to a large extent on how easy it is to consume. Good and easily accessible documentation is an important part of whether an API is useful. In this chapter, we will learn how we can use the OpenAPI Specification to document APIs that we can make externally accessible from a microservice landscape.

As we mentioned in Chapter 2, Introduction to Spring Boot, the OpenAPI Specification, previously known as the Swagger specification, is one of the most commonly used specifications when it comes to documenting RESTful services. Many of the leading API gateways have native support for the OpenAPI Specification. We will learn how to use the open source project springdoc-openapi to produce such documentation. We will also learn how to embed an API documentation viewer, Swagger UI viewer, which can be used both to inspect the API documentation and also to make requests to the API.

By the end...

Adding Persistence

In this chapter, we will learn how to persist data that a microservice is using. As already mentioned in Chapter 2, Introduction to Spring Boot, we will use the Spring Data project to persist data to MongoDB and MySQL databases.

The product and recommendation microservices will use Spring Data for MongoDB and the review microservice will use Spring Data for the JPA (short for the Java Persistence API) to access a MySQL database. We will add operations to the RESTful APIs to be able to create and delete data in the databases. The existing APIs for reading data will be updated to access the databases. We will run the databases as Docker containers, managed by Docker Compose, that is, in the same way as we run our microservices.

The following topics will be covered in this chapter:

  • Adding a persistence layer to the core microservices
  • Writing automated tests that focus on persistence
  • Using the persistence layer in the service layer
  • ...

Developing Reactive Microservices

In this chapter, we will learn how to develop reactive microservices, that is, how to develop non-blocking synchronous REST APIs and asynchronous event-driven services. We will also learn about how to choose between these two alternatives. Finally, we will see how to create and run manual and automated tests of a reactive microservice landscape.

As already described in Chapter 1, Introduction to Microservices, the foundation for reactive systems is that they are message-driven—they use asynchronous communication. This enables them to be elastic, in other words, scalable and resilient, meaning that they will be tolerant of failures. Elasticity and resilience together will enable a reactive system to be responsive.

The following topics will be covered in this chapter:

  • Choosing between non-blocking synchronous APIs and event-driven asynchronous services
  • Developing non-blocking synchronous REST APIs
  • Developing event...
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Key benefits

  • Build cloud-native production-ready microservices with this comprehensively updated guide
  • Understand the challenges of building large-scale microservice architectures
  • Learn how to get the best out of Spring Cloud, Kubernetes, and Istio in combination

Description

Want to build and deploy microservices, but don’t know where to start? Welcome to Microservices with Spring Boot and Spring Cloud. This edition features the most recent versions of Spring, Java, Kubernetes, and Istio, demonstrating faster and simpler handling of Spring Boot, local Kubernetes clusters, and Istio installation. The expanded scope includes native compilation of Spring-based microservices, support for Mac and Windows with WSL2, and an introduction to Helm 3 for packaging and deployment. A revamped security chapter now follows the OAuth 2.1 specification and makes use of the newly launched Spring Authorization Server from the Spring team. You’ll start with a set of simple cooperating microservices, then add persistence and resilience, make your microservices reactive, and document their APIs using OpenAPI. Next, you’ll learn how fundamental design patterns are applied to add important functionality, such as service discovery with Netflix Eureka and edge servers with Spring Cloud Gateway. You’ll deploy your microservices using Kubernetes and adopt Istio, then explore centralized log management using the Elasticsearch, Fluentd, and Kibana (EFK) stack, and then monitor microservices using Prometheus and Grafana. By the end of this book, you'll be building scalable and robust microservices using Spring Boot and Spring Cloud.

Who is this book for?

If you’re a Java or Spring Boot developer learning how to build microservice landscapes from scratch, then this book is for you. You don’t need any prior knowledge about microservices architecture to get started, but a solid grasp and enough experience in Java and Spring Boot to build apps autonomously is a must.

What you will learn

  • Build reactive microservices using Spring Boot
  • Develop resilient and scalable microservices using Spring Cloud
  • Use OAuth 2.1/OIDC and Spring Security to protect public APIs
  • Implement Docker to bridge the gap between development, testing, and production
  • Deploy and manage microservices with Kubernetes
  • Apply Istio for improved security, observability, and traffic management
  • Write and run automated microservice tests with JUnit, testcontainers, Gradle, and bash
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Table of Contents

5 Chapters
Part I: Getting Started with Microservice Development Using Spring Boot Chevron down icon Chevron up icon
Part II: Leveraging Spring Cloud to Manage Microservices Chevron down icon Chevron up icon
Part III: Developing Lightweight Microservices Using Kubernetes Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Full star icon Half star icon 4.1
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5 star 61.5%
4 star 7.7%
3 star 15.4%
2 star 7.7%
1 star 7.7%
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Amazon Customer Nov 11, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is one of my favorite books on Spring Boot microservices altogether and the second edition covers even more topics than the first, updated to Fall 2021. It is one thing to learn about the concepts and technologies and do some tutorials, but it's quite another thing to apply this to a real world application. This book puts it all together in a hands-on fashion and has proven virtually invaluable for our team venturing into that area. Expect a steep learning curve, though, as the matter is complicated. In part I you'll develop a simple set of core services plus one composite, from simple to reactive and message-based. In the following parts, you learn how to deploy them utilizing Spring Cloud, Docker, Kubernetes, Istio and such, the amount of technologies involved is huge and comprehensive. I would recommend to write your own microservice set for a slightly different domain (I did so in Kotlin) and use the book's code examples as a reference, as you learn best from doing mistakes, but it's worth it. Besides, the code contains many practical recipes, hints and solutions, including testing. A book like this cannot be a one-stop of course, but it gives you a good overview of things while being as concise as possible. We are grateful to the author he spent the effort writing it.
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alexsm86 Aug 02, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very good and informative book. Definitely recommend for everyone interested in Java and microservices.
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bluelight Nov 01, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Have to admit - this book exceeded my expectations by a big margin. I do not think there is any better practical introduction to the micro services out there. Shows typical micro service evolution and how-to make it state of the art. "Micro" is very deceiving, the real production grade micro service is not a cup cake!
Amazon Verified review Amazon
Ermiyas Kidane Jul 07, 2023
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Easier to understand
Amazon Verified review Amazon
sgnsajgon Sep 21, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
One of my favorite books in topic. Second editions updates knowledge regarding most popular technologies. Good choice for all developers, either less experienced Java Devs or Seniors from other technology stacks.
Amazon Verified review Amazon
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