Book Image

Building Applications with Spring 5 and Kotlin

By : Miloš Vasić
Book Image

Building Applications with Spring 5 and Kotlin

By: Miloš Vasić

Overview of this book

Kotlin is being used widely by developers because of its light weight, built-in null safety, and functional and reactive programming aspects. Kotlin shares the same pragmatic, innovative and opinionated mindset as Spring, so they work well together. Spring when combined with Kotlin helps you to reach a new level of productivity. This combination has helped developers to create Functional Applications using both the tools together. This book will teach you how to take advantage of these developments and build robust, scalable and reactive applications with ease. In this book, you will begin with an introduction to Spring and its setup with Kotlin. You will then dive into assessing the design considerations of your application. Then you will learn to use Spring (with Spring Boot) along with Kotlin to build a robust backend in a microservice architecture with a REST based collaboration, and leverage Project Reactor in your application. You’ll then learn how to integrate Spring Data and Spring Cloud to manage configurations for database interaction and cloud deployment. You’ll also learn to use Spring Security to beef up security of your application before testing it with the JUnit framework and then deploying it on a cloud platform like AWS.

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Table of Contents (12 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Starting Up
Starting Up
What is your mission?
Separating code into independent entities
Planning your development
Preparing the working environment
Setting up a Git repository
Summary
2
Starting with Spring
Starting with Spring
What is Spring?
Creating Spring project
Creating Spring project with IntelliJ
Summary
3
Building Your First Spring RESTful Service with Kotlin
Building Your First Spring RESTful Service with Kotlin
Defining dependencies for our project
Our first controller
Adding a data class
Running the application
Adding an @Service component
Summary
4
Working with Spring Data JPA and MySQL
Working with Spring Data JPA and MySQL
Introducing Spring Data JPA
Installing MySQL
Creating a schema
CRUD operations
Creating database queries
Summary
5
Securing Applications with Spring Security
Securing Applications with Spring Security
Introducing Spring Security
Securing your REST API with basic authentication
What else can Spring Security do?
Summary
6
Spring Cloud
Spring Cloud
Microservice architecture versus SOA
Understanding microservice architectures
Microservices with Spring Cloud
Securing Spring Cloud services
Summary
7
Using Project Reactor
Using Project Reactor
Why use Project Reactor?
What is Project Reactor?
Using Project Reactor
Summary
8
Development Practices
Development Practices
Challenging development practices
Good ways to develop your code
Summary
9
Testing
Testing
Why is testing a crucial part of development?
Preparing our project
Writing our first test with Kotlin
Running the test in InteliJ IDEA
Testing Spring REST applications
Running test suites
Summary
10
Project Deployment
Project Deployment
What will be deployed?
Deployment options
Deploying to the Cloud (AWS)
Summary
11
Other Books You May Enjoy
Other Books You May Enjoy
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Microservice architecture versus SOA

SOA stands for service-oriented architecture. To remind you, in short, SOA can be defined by the following points:

  • Services are autonomous
  • Their boundaries are explicit
  • Services share schemas and contracts (not class)
  • Service compatibility is based on the policy

In SOA, several different services (smaller applications) can be combined to act as one single big application. This gives us the conclusion that by using SOA, we achieve modularity for our software. Services in SOA pass and parse messages by protocols that describe them.

Based on this, we can explain microservices with respect to SOA. Microservices represent the interpretation of SOA, which is used to build distributed systems. Services in a microservice architecture are processes that communicate with each other. You must have noted that there is no single commonly agreed definition...

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