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Home > Web Development > Microservices > Spring: Microservices with Spring Boot
Spring: Microservices with Spring Boot
Spring: Microservices with Spring Boot

Spring: Microservices with Spring Boot: Build and deploy microservices with Spring Boot

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Spring: Microservices with Spring Boot

Chapter 2. Extending Microservices

We built a basic component offering a few services in Lesson 1, Building Microservices with Spring Boot. In this lesson, we will focus on adding more features to make our microservice production ready.

We will discuss how to add these features to our microservice:

  • Exception handling
  • HATEOAS
  • Caching
  • Internationalization

We will also discuss how to document our microservice using Swagger. We will look at the basics of securing the microservice with Spring Security.

Exception Handling

Exception handling is one of the important parts of developing web services. When something goes wrong, we would want to return a good description of what went wrong to the service consumer. You would not want the service to crash without returning anything useful to the service consumer.

Spring Boot provides good default exception handling. We will start with looking at the default exception handling features provided by Spring Boot before moving on to customizing them.

Spring Boot Default Exception Handling

To understand the default exception handling provided by Spring Boot, let's start with firing a request to a nonexistent URL.

Non-Existent Resource

Let's send a GET request to http://localhost:8080/non-existing-resource using a header (Content-Type:application/json).

The following screenshot shows the response when we execute the request:

Non-Existent Resource

The response is as shown in the following code snippet:

    {
      "timestamp": 1484027734491,
      "status...

HATEOAS

HATEOAS (Hypermedia as the Engine of Application State) is one of the constraints of the REST application architecture.

Let's consider a situation where a service consumer is consuming numerous services from a service provider. The easiest way to develop this kind of system is to have the service consumer store the individual resource URIs of every resource they need from the service provider. However, this would create tight coupling between the service provider and the service consumer. Whenever any of the resource URIs change on the service provider, the service consumer needs to be updated.

Consider a; typical web application. Let's say I navigate to my bank account details page. Almost all banking websites would show links to all the transactions that are possible on my bank account on the screen so that I can easily navigate using the link.

What if we can bring a; similar concept to RESTful services so that a service returns not only the data about the requested resource...

Exception Handling

Exception handling is one of the important parts of developing web services. When something goes wrong, we would want to return a good description of what went wrong to the service consumer. You would not want the service to crash without returning anything useful to the service consumer.

Spring Boot provides good default exception handling. We will start with looking at the default exception handling features provided by Spring Boot before moving on to customizing them.

Spring Boot Default Exception Handling

To understand the default exception handling provided by Spring Boot, let's start with firing a request to a nonexistent URL.

Non-Existent Resource

Let's send a GET request to http://localhost:8080/non-existing-resource using a header (Content-Type:application/json).

The following screenshot shows the response when we execute the request:

The response is as shown in the following code snippet:

    {
      "timestamp": 1484027734491,
      "status": 404,
      "error": "Not...

HATEOAS

HATEOAS (Hypermedia as the Engine of Application State) is one of the constraints of the REST application architecture.

Let's consider a situation where a service consumer is consuming numerous services from a service provider. The easiest way to develop this kind of system is to have the service consumer store the individual resource URIs of every resource they need from the service provider. However, this would create tight coupling between the service provider and the service consumer. Whenever any of the resource URIs change on the service provider, the service consumer needs to be updated.

Consider a; typical web application. Let's say I navigate to my bank account details page. Almost all banking websites would show links to all the transactions that are possible on my bank account on the screen so that I can easily navigate using the link.

What if we can bring a; similar concept to RESTful services so that a service returns not only the data about the requested resource, but...

Validation

A good service always validates data before processing it. In this section, we will look at the Bean Validation API and use its reference implementation to implement validation in our services.

The Bean Validation API provides a number of annotations that can be used to validate beans. The JSR 349 specification defines Bean Validation API 1.1. Hibernate-validator is the reference implementation; both are already defined as dependencies in the spring-boot-web-starter project:

  • hibernate-validator-5.2.4.Final.jar

  • validation-api-1.1.0.Final.jar

We will create a simple validation for the createTodo service method.

Creating validations involves two steps:

  1. Enabling validation on the controller method.

  2. Adding validations on the bean.

Enabling Validation on the Controller Method

It's very simple to enable validation on the controller method. The following snippet shows an example:

    @RequestMapping(method = RequestMethod.POST, 
    path = "/users/{name}/todos")
    ResponseEntity<?>...

Documenting REST Services

Before a service provider can consume a service, they need a service contract. A service contract defines all the; details about a service:

  • How can I call a service? What is the URI of the service?

  • What should be the request format?

  • What kind of response should I expect?

There are multiple options to define a service contract for RESTful services. The most popular one in the last couple of years is Swagger. Swagger is gaining a lot of ground, with support from major vendors in the last couple of years. In this section, we will generate Swagger documentation for our services.

The following quote from the Swagger website (http://swagger.io) defines the purpose of the Swagger specification:

Swagger specification creates the RESTful contract for your API, detailing all of its resources and operations in a human and machine readable format for easy development, discovery, and integration.

Generating a Swagger Specification

One of the interesting developments in the last few...

Securing REST Services with Spring Security

All the services we have created up until now are unsecured. A consumer does not need to provide any credentials to access these services. However, all services in the real world are usually secured.

In this section, we will discuss two ways of authenticating REST services:

  • Basic authentication

  • OAuth 2.0 authentication

We will implement these two types of authentication with Spring Security.

Spring Boot provides a starter for Spring Security using spring-boot-starter-security. We will start with adding Spring Security starter to our pom.xml file.

Adding Spring Security Starter

Add the following dependency to your file pom.xml:

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-security</artifactId>
    </dependency>

The Spring-boot-starter-security dependency brings in three important Spring Security dependencies:

  • spring-security-config

  • spring-security-core

  • spring...

Internationalization

Internationalization (i18n) is the process of developing applications and services so that they can be customized for different languages and cultures across the world. It is also called localization. The goal of internationalization or localization is to build applications that can offer content in multiple languages and formats.

Spring Boot has built-in support for internationalization.

Let's build a simple service to understand how we can build internationalization in our APIs.

We would need to add a LocaleResolver and a message source to our Spring Boot application. The following code snippet should be included in Application.java:

    @Bean
    public LocaleResolver localeResolver() {
      SessionLocaleResolver sessionLocaleResolver = 
      new SessionLocaleResolver();
      sessionLocaleResolver.setDefaultLocale(Locale.US);
      return sessionLocaleResolver;
    }

   @Bean
   public ResourceBundleMessageSource messageSource() {
     ResourceBundleMessageSource...

Caching

Caching data from services plays a crucial role in improving the performance and scalability of applications. In this section, we will look at the implementation options that Spring Boot provides.

Spring provides a caching abstraction based on annotations. We will start with using Spring caching annotations. Later, we will introduce JSR-107 caching annotations and compare them with Spring abstractions.

Spring-boot-starter-cache

Spring Boot provides a starter project for caching spring-boot-starter-cache. Adding this to an application brings in all the dependencies to enable JSR-107 and Spring caching annotations. The following code snippet shows the dependency details for spring-boot-starter-cache. Let's add this to our file pom.xml:

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>

Enabling Caching

Before we can start using caching, we need to enable caching...

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Key benefits

  • • Get to know the advanced features of Spring Boot in order to develop and monitor applications
  • • Use Spring cloud to deploy and manage microservices on the cloud
  • • Look at embedded servers and deploy a test application to a PaaS Cloud platform
  • • Embedded with assessments that will help you revise the concepts you have learned in this book

Description

Microservices helps in decomposing applications into small services and move away from a single monolithic artifact. It helps in building systems that are scalable, flexible, and high resilient. Spring Boot helps in building REST-oriented, production-grade microservices. This book is a quick learning guide on how to build, monitor, and deploy microservices with Spring Boot. You'll be first familiarized with Spring Boot before delving into building microservices. You will learn how to document your microservice with the help of Spring REST docs and Swagger documentation. You will then learn how to secure your microservice with Spring Security and OAuth2. You will deploy your app using a self-contained HTTP server and also learn to monitor a microservice with the help of Spring Boot actuator. This book is ideal for Java developers who knows the basics of Spring programming and want to build microservices with Spring Boot. This book is embedded with useful assessments that will help you revise the concepts you have learned in this book. This book is repurposed for this specific learning experience from material from Packt's Mastering Spring 5.0 by Ranga Rao Karanam.

Who is this book for?

This book is aimed at Java developers who knows the basics of Spring programming and want to build microservices with Spring Boot.

What you will learn

  • • Use Spring Initializr to create a basic spring project
  • • Build a basic microservice with Spring Boot
  • • Implement caching and exception handling
  • • Secure your microservice with Spring security and OAuth2
  • • Deploy microservices using self-contained HTTP server
  • • Monitor your microservices with Spring Boot actuator
  • • Learn to develop more effectively with developer tools
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Publication date : Mar 14, 2018
Length: 140 pages
Edition : 1st
Language : English
ISBN-13 : 9781789132588
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Category :
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Languages :
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ISBN-13 : 9781789132588
Vendor :
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Category :
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Languages :
Java
Concepts :
Microservices
Tools :
Spring

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Table of Contents

4 Chapters
1. Building Microservices with Spring Boot Chevron down icon Chevron up icon
1. Building Microservices with Spring Boot
What is Spring Boot?
Spring Boot Hello World
What is REST?
First REST Service
Creating a Todo Resource
Spring Initializr
A Quick Peek into Auto-Configuration
Summary
Assessments
2. Extending Microservices Chevron down icon Chevron up icon
2. Extending Microservices
Exception Handling
HATEOAS
Validation
Documenting REST Services
Securing REST Services with Spring Security
Internationalization
Caching
Summary
Assessments
3. Advanced Spring Boot Features Chevron down icon Chevron up icon
3. Advanced Spring Boot Features
Externalised Configuration
Embedded Servers
Developer Tools
Spring Boot Actuator
Deploying an Application to Cloud
Summary
Assessments
4. Assessment Answers Chevron down icon Chevron up icon
Lesson 1: Building Microservices with Spring Boot
Lesson 2: Extending Microservices
Lesson 3: Advanced Spring Boot Features

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About the author

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In28Minutes Official
Ranga Rao Karanam is the founder of in28Minutes, a company that trains 300,000 developers across the globe in relation to the cloud, microservices, Spring, Spring Boot, and Containers. He loves programming, and loves consulting for start-ups on developing scalable cloud applications and following modern development practices, such as BDD, continuous delivery, and DevOps. In his spare time, he loves hiking, cricket, and tennis. His ambition is to spend a year hiking the Himalayas.
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  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela