Download Spring Microservices in Action PDF for Free - A Complete Tutorial on Building Microservice-Based Applications with Spring
H3: Managing configuration with Spring Cloud Config H3: Implementing client-side resiliency with Spring, Hystrix, and Ribbon H3: Routing requests with Netflix Zuul H3: Securing microservices with Spring Security and OAuth2 H3: Testing and deploying microservices with Spring Cloud Contract and Docker H2: Where to download Spring Microservices in Action pdf? H2: Conclusion H2: FAQs # Article with HTML formatting Spring Microservices in Action: A Comprehensive Guide for Java Developers
If you are a Java developer who wants to learn how to build microservice-based applications using Spring Boot and Spring Cloud, then this article is for you. In this article, you will learn what are microservices and why use them, what is Spring Boot and Spring Cloud, how to build microservice-based applications with Spring Boot and Spring Cloud, and where to download Spring Microservices in Action pdf.
Spring Microservices in Action download pdf
What are microservices and why use them?
Microservices are small, distributed, and independent services that communicate with each other through well-defined APIs. They are designed to be loosely coupled, highly cohesive, and scalable. Microservices break up your code into modular components that can be developed, tested, deployed, and maintained independently. This allows you to deliver faster, more reliable, and more flexible software.
Some of the benefits of using microservices are:
You can use different technologies, languages, frameworks, and databases for each service according to its needs.
You can deploy and update each service independently without affecting the rest of the system.
You can scale each service horizontally or vertically according to its demand.
You can isolate faults and failures in each service without impacting the whole system.
You can improve the performance and availability of each service by using load balancing, caching, circuit breaking, and other techniques.
Some of the challenges of using microservices are:
You need to design your services carefully to avoid tight coupling, redundant code, and inconsistent APIs.
You need to manage the complexity and overhead of distributed systems, such as network latency, concurrency, security, logging, monitoring, tracing, etc.
You need to coordinate the development, testing, deployment, and maintenance of multiple services across different teams.
You need to handle the data consistency and transactions across multiple services.
What is Spring Boot and Spring Cloud?
Spring Boot and Spring Cloud are two popular projects from the Spring ecosystem that simplify your microservice development. They provide a set of tools and frameworks that help you create, configure, run, test, secure, monitor, and deploy your microservices with ease.
Spring Boot is an open-source project that makes it easy to create stand-alone, production-grade Spring applications. It provides a convention-over-configuration approach that eliminates the need for boilerplate code and XML configuration. It also offers a number of features that enhance your productivity and performance, such as:
Auto-configuration: It automatically configures your application based on the dependencies you add.
Starter dependencies: It provides a set of starter dependencies that include all the necessary libraries for common use cases.
Embedded servers: It embeds Tomcat, Jetty, or Undertow as web servers that run your application without requiring any installation or configuration.
Actuator: It exposes various endpoints that provide information about the health, metrics, environment, beans, mappings, etc. of your application.
Spring CLI: It allows you to create and run Spring applications using Groovy scripts or Java classes.
Spring Cloud is an open-source project that provides a set of tools and frameworks for building cloud-native microservices. It leverages the features of Spring Boot and integrates with various cloud platforms and services. It also offers a number of features that address the challenges of distributed systems, such as:
Spring Cloud Config: It provides a centralized server that manages the configuration of your microservices across different environments.
Spring Cloud Netflix: It integrates with Netflix OSS components that provide service discovery, load balancing, circuit breaking, routing, etc. for your microservices.
Spring Cloud Security: It provides authentication and authorization for your microservices using OAuth2 and JWT.
Spring Cloud Gateway: It provides a lightweight API gateway that routes and filters requests to your microservices.
Spring Cloud Contract: It provides a way to verify the contracts between your microservices using consumer-driven contract testing.
Spring Cloud Stream: It provides a way to communicate between your microservices using message brokers such as Kafka or RabbitMQ.
How to build microservice-based applications with Spring Boot and Spring Cloud?
Creating basic services with Spring Boot
To create a basic service with Spring Boot, you need to follow these steps:
Create a new project using Spring Initializr (https://start.spring.io/) or Spring Boot CLI. Choose the dependencies you need, such as Web, JPA, Lombok, etc.
Create a domain model class that represents your entity. Annotate it with @Entity, @Id, @GeneratedValue, etc.
Create a repository interface that extends JpaRepository or CrudRepository to perform CRUD operations on your entity.
Create a service interface that defines the business logic for your entity. Annotate it with @Service.
Create a service implementation class that implements the service interface. Inject the repository using @Autowired.
Create a controller class that exposes REST endpoints for your entity. Annotate it with @RestController, @RequestMapping, @GetMapping, @PostMapping, etc. Inject the service using @Autowired.
Run your application using mvn spring-boot:run or java -jar target/*.jar. Test your endpoints using curl or Postman.
Managing configuration with Spring Cloud Config
To manage the configuration of your microservices with Spring Cloud Config, you need to follow these steps:
Create a new project for the config server using Spring Initializr or Spring Boot CLI. Add the dependency for Spring Cloud Config Server.
Annotate the main class with @EnableConfigServer.
Create an application.properties file in the src/main/resources folder. Configure the properties for the config server, such as server.port, spring.cloud.config.server.git.uri, spring.cloud.config.server.git.default-label, etc.
Create a Git repository that contains the configuration files for your microservices. Each file should be named as application-name-profile.properties or application-name-profile.yml. For example, book-service-dev.properties or book-service-dev.yml.
Add the properties for each microservice in its corresponding file. For example, server.port, spring.datasource.url, spring.datasource.username, spring.datasource.password, etc.
Run the config server using mvn spring-boot:run or java -jar target/*.jar.
Create a new project for each microservice using Spring Initializr or Spring Boot CLI. Add the dependency for Spring Cloud Config Client.
Create a bootstrap.properties file in the src/main/resources folder. Configure the properties for the config client, such as spring.application.name, spring.profiles.active, spring.cloud.config.uri, etc.
Run each microservice using mvn spring-boot:run or java -jar target/*.jar. Test the configuration using curl or Postman.
Implementing client-side resiliency with Spring, Hystrix, and Ribbon
To implement client-side resiliency with Spring, Hystrix, and Ribbon, you need to follow these steps:
Create a new project for each microservice using Spring Initializr or Spring Boot CLI. Add the dependencies for Web, Hystrix, and Ribbon.
Annotate the main class with @EnableCircuitBreaker and @EnableDiscoveryClient.
Create a domain model class that represents your entity. Annotate it with @Entity, @Id, @GeneratedValue, etc.
Create a repository interface that extends JpaRepository or CrudRepository to perform CRUD operations on your entity.
Routing requests with Netflix Zuul
To route requests to your microservices with Netflix Zuul, you need to follow these steps:
Create a new project for the Zuul server using Spring Initializr or Spring Boot CLI. Add the dependencies for Spring Cloud Starter Netflix Zuul and Spring Cloud Starter Netflix Eureka Client.
Annotate the main class with @EnableZuulProxy and @EnableDiscoveryClient.
Create an application.properties file in the src/main/resources folder. Configure the properties for the Zuul server, such as server.port, spring.application.name, eureka.client.service-url.defaultZone, etc.
Optionally, you can customize the routes for your microservices using zuul.routes.service-id.path and zuul.routes.service-id.service-id properties.
Run the Zuul server using mvn spring-boot:run or java -jar target/*.jar.
Create a new project for each microservice using Spring Initializr or Spring Boot CLI. Add the dependencies for Web and Spring Cloud Starter Netflix Eureka Client.
Annotate the main class with @EnableDiscoveryClient.
Create an application.properties file in the src/main/resources folder. Configure the properties for each microservice, such as server.port, spring.application.name, eureka.client.service-url.defaultZone, etc.
Run each microservice using mvn spring-boot:run or java -jar target/*.jar.
Test the routing using curl or Postman. You can access each microservice through the Zuul server using http://localhost:zuul-port/service-name/endpoint.
Securing microservices with Spring Security and OAuth2
To secure your microservices with Spring Security and OAuth2, you need to follow these steps:
Create a new project for the authorization server using Spring Initializr or Spring Boot CLI. Add the dependencies for Web, Security, and Spring Cloud Security.
Annotate the main class with @EnableAuthorizationServer and @EnableResourceServer.
Create a WebSecurityConfigurerAdapter class that configures the authentication manager and password encoder.
Create an AuthorizationServerConfigurerAdapter class that configures the client details service, token store, token converter, token enhancer, etc.
Create an application.properties file in the src/main/resources folder. Configure the properties for the authorization server, such as server.port, security.user.name, security.user.password, etc.
Run the authorization server using mvn spring-boot:run or java -jar target/*.jar.
Create a new project for each resource server using Spring Initializr or Spring Boot CLI. Add the dependencies for Web and Spring Cloud Security.
Annotate the main class with @EnableResourceServer.
Create a ResourceServerConfigurerAdapter class that configures the resource id and access rules for each endpoint.
Create an application.properties file in the src/main/resources folder. Configure the properties for each resource server, such as server.port, security.oauth2.resource.id, security.oauth2.resource.jwt.key-uri, etc.
Run each resource server using mvn spring-boot:run or java -jar target/*.jar.
Test the security using curl or Postman. You can obtain an access token from the authorization server using http://localhost:auth-port/oauth/token with basic authentication and grant_type=password. You can access each resource server using http://localhost:resource-port/endpoint with bearer authentication and access token.
Testing and deploying microservices with Spring Cloud Contract and Docker
To test and deploy your microservices with Spring Cloud Contract and Docker, you need to follow these steps:
Create a new project for each microservice using Spring Initializr or Spring Boot CLI. Add the dependencies for Web and Spring Cloud Contract Verifier.
Create a contract definition file in the src/test/resources/contracts folder. Specify the request and response parameters for each endpoint using Groovy DSL or YAML format.
Annotate a base test class with @RunWith(SpringRunner.class) and @SpringBootTest(webEnvironment = WebEnvironment.MOCK). Inject the MockMvc instance using @Autowired.
Annotate a test class with @AutoConfigureRestDocs, @AutoConfigureMockMvc, and @AutoConfigureJsonTesters. Extend the base test class and the generated test class from the contract.
Run the tests using mvn test or gradle test. The tests will generate stubs and documentation for each endpoint.
Create a Dockerfile in the root folder of each project. Specify the base image, copy the jar file, and expose the port.
Build the Docker image using docker build -t image-name .
Run the Docker container using docker run -p host-port:container-port image-name.
Test the deployment using curl or Postman. You can access each microservice using http://localhost:host-port/endpoint.
Where to download Spring Microservices in Action pdf?
If you want to learn more about Spring microservices in action, you can download the pdf version of the book from various sources. However, we recommend that you buy the book from the official publisher, Manning Publications, to support the authors and get the latest updates. You can find the book here: https://www.manning.com/books/spring-microservices-in-action-second-edition.
The book covers all the topics mentioned in this article and more, such as:
Spring Cloud Bus
Spring Cloud Sleuth and Zipkin
Spring Cloud Kubernetes
Spring Cloud OpenFeign
Spring Cloud Function
Reactive microservices
The book also provides a lot of code examples and exercises that you can follow along and practice your skills. The book is written by John Carnell and Illary Huaylupo Sánchez, who are experienced software engineers and Spring enthusiasts.
Conclusion
In this article, we have learned how to build microservice-based applications using Spring Boot and Spring Cloud. We have seen how to use various tools and frameworks that simplify our development and deployment process, such as:
Spring Boot for creating stand-alone, production-grade Spring applications
Spring Cloud Config for managing configuration across different environments
Hystrix and Ribbon for implementing client-side resiliency
Zuul for routing requests to different microservices
Spring Security and OAuth2 for securing microservices with authentication and authorization
Spring Cloud Contract for verifying contracts between microservices
Docker for packaging and running microservices as containers
We have also learned where to download Spring Microservices in Action pdf, which is a comprehensive guide for Java developers who want to master Spring microservices.
FAQs
What are the benefits of microservices?
Some of the benefits of microservices are:
They allow you to use different technologies, languages, frameworks, and databases for each service according to its needs.
They allow you to deploy and update each service independently without affecting the rest of the system.
They allow you to scale each service horizontally or vertically according to its demand.
They allow you to isolate faults and failures in each service without impacting the whole system.
They allow you to improve the performance and availability of each service by using load balancing, caching, circuit breaking, and other techniques.
What are the challenges of microservices?
Some of the challenges of microservices are:
You need to design your services carefully to avoid tight coupling, redundant code, and inconsistent APIs.
You need to manage the complexity and overhead of distributed systems, such as network latency, concurrency, security, logging, monitoring, tracing, etc.
You need to coordinate the development, testing, deployment, and maintenance of multiple services across different teams.
You need to handle the data consistency and transactions across multiple services.
What is Spring Boot?
Spring Boot is an open-source project that makes it easy to create stand-alone, production-grade Spring applications. It provides a convention-over-configuration approach that eliminates the need for boilerplate code and XML configuration. It also offers a number of features that enhance your productivity and performance, such as auto-configuration, starter dependencies, embedded servers, actuator, Spring CLI, etc.
What is Spring Cloud?
Spring Cloud Bus
Spring Cloud Bus is a project that provides a way to broadcast configuration changes and other management instructions to multiple instances of a microservice. It uses a message broker, such as RabbitMQ or Kafka, to communicate between the microservices and the Spring Cloud Config server.
To use Spring Cloud Bus, you need to follow these steps:
Create a new project for the config server using Spring Initializr or Spring Boot CLI. Add the dependencies for Spring Cloud Config Server and Spring Cloud Bus.
Annotate the main class with @EnableConfigServer and @RefreshScope.
Create an application.properties file in the src/main/resources folder. Configure the properties for the config server, such as server.port, spring.cloud.config.server.git.uri, spring.cloud.config.server.git.default-label, spring.cloud.bus.enabled, spring.rabbitmq.host, spring.rabbitmq.port, etc.
Run the config server using mvn spring-boot:run or java -jar target/*.jar.
Create a new project for each microservice using Spring Initializr or Spring Boot CLI. Add the dependencies for Web, Spring Cloud Config Client, and Spring Cloud Bus.
Annotate the main class with @RefreshScope.
Create a bootstrap.properties file in the src/main/resources folder. Configure the properties for each microservice, such as spring.application.name, spring.profiles.active, spring.cloud.config.uri, spring.cloud.bus.enabled, spring.rabbitmq.host, spring.rabbitmq.port, etc.
Run each microservice using mvn spring-boot:run or java -jar target/*.jar.
Test the configuration changes using curl or Postman. You can update the configuration files in the Git repository and commit them. Then you can send a POST request to http://localhost:config-port/actuator/bus-refresh to trigger the refresh event. You can verify that all the microservices have received the updated configuration by sending a GET request to http://localhost:service-port/actuator/env.
Spring Cloud Sleuth and Zipkin
Spring Cloud Sleuth is a project that provides distributed tracing capabilities for Spring Boot applications. It adds trace and span ids to the logs and headers of each request, which can be used to correlate and analyze the behavior of different microservices. Zipkin is an open-source project that provides me