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Building Applications with Spring 5 and Kotlin
Building Applications with Spring 5 and Kotlin

Building Applications with Spring 5 and Kotlin: Build scalable and reactive applications with Spring combined with the productivity of Kotlin

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Building Applications with Spring 5 and Kotlin

Starting with Spring

In the previous chapter, we set up our development environment. We are now ready to create our first Spring code written in Kotlin. To do that, we will get familiar with Spring background and explain what exactly Spring can do. When we introduce you to Spring background, we will kick off the project! Get ready!

In this chapter, we will learn the following:

  • What is Spring?
  • Spring's most important features
  • Kotlin support for Spring
  • Generating projects
  • Creating Spring project in IntelliJ

What is Spring?

The Spring Framework is a framework developed by the Pivotal company. The framework offers to end the user's programming and configuration model for modern enterprise applications. Spring Framework is made for developers to be able to focus on application-level business logic. Today almost all modern enterprise applications are developed by using Spring Framework. That makes it one of the most widely used and popular development frameworks available.

What features does it offer?

Spring Framework comes with plenty of modern features every developer needs. Here, we will highlight the most important ones and say a few words about them.

...

Creating Spring project

The time has come to create our first Spring code and run it. We will, of course, use Kotlin as our primary development language. For project initialization, we will use Spring Initializr.

What is Spring Initializr?

In one sentence, Spring Initializr is a web-based quick start generator for Spring Framework projects. You can access it online at the following URL:

https://start.spring.io/

And from it's GitHub repository, https://github.com/spring-io/initializr, since it's open an source project.

Spring Initializr provides API to generate quick start Spring Framework projects. You can use the default instance hosted on the spring.io domain or clone the GitHub repository and host your own instance...

Creating Spring project with IntelliJ

To close this chapter, we will demonstrate how to initialize the project from IntelliJ Idea. We will get pretty much the same result as with Initializr. Start IntelliJ and select the Create new project option. A New Project dialog box appears, as shown in the following screenshot:

Set your project options, and then select the Spring Framework components as shown in the following screenshot:

Also, select Kotlin/JVM as the language we will use, as shown in the following screenshot:

Follow the wizard until the project is ready. You will be asked to enable annotations, as shown in the following screenshot. Please do so!

In the following screenshot, you have probably noticed that there is no Spring 5 available as an option, so we will stick to Initializr project initialization since it supports everything we want:

...

Summary

In this chapter, we introduced you to Spring Framework and its features. We kicked off our first project and successfully performed building and execution. In the next chapter, we will continue our journey and do some more concrete work. We will create our first RESTful service with the controller, data class, and service components.

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Key benefits

  • Build a full-fledged application in Spring and Kotlin
  • Architect your application to take a microservice-based approach in the cloud
  • Integrate your application with a variety of Spring components

Description

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.

Who is this book for?

Developers comfortable using Spring who have basic knowledge of Kotlin and want to take their development skills to the next level and build enterprise-grade applications will benefit from this book.

What you will learn

  • Explore Spring 5 concepts with Kotlin
  • Learn both dependency injections and complex configurations
  • Utilize Spring Data, Spring Cloud, and Spring Security in your applications
  • Create efficient reactive systems with Project Reactor
  • Write unit tests for your Spring/Kotlin applications
  • Deploy applications on cloud platforms like AWS

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 18, 2018
Length: 310 pages
Edition : 1st
Language : English
ISBN-13 : 9781788394802
Vendor :
Pivotal
Languages :
Tools :

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Product Details

Publication date : May 18, 2018
Length: 310 pages
Edition : 1st
Language : English
ISBN-13 : 9781788394802
Vendor :
Pivotal
Languages :
Tools :

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Table of Contents

11 Chapters
Starting Up Chevron down icon Chevron up icon
Starting with Spring Chevron down icon Chevron up icon
Building Your First Spring RESTful Service with Kotlin Chevron down icon Chevron up icon
Working with Spring Data JPA and MySQL Chevron down icon Chevron up icon
Securing Applications with Spring Security Chevron down icon Chevron up icon
Spring Cloud Chevron down icon Chevron up icon
Using Project Reactor Chevron down icon Chevron up icon
Development Practices Chevron down icon Chevron up icon
Testing Chevron down icon Chevron up icon
Project Deployment Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Nevyn Jul 12, 2018
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
If you are an absolute beginner who requires screenshots, then this book is for you. The only con for you then is that the writer is very brief in explaining things that for a beginner requires a deeper description.As for me (not a beginner). I paged through 15% of the book to get to the end of installing the tools you need. After that the next chapter described what Spring Framework is. MVC was explained on 3 pages, one for each component and even then only a small paragraph each. In all the chapter is like a bullet list of features which would be far too cryptic for a beginner. 20% of the book gets you nowhere.At that point I requested a refund.Why?The book seems like something rushed to be a first to cover the combined topics. The software covered are milestone and release candidates, except for Kotlin which is a major version behind. Why not wait for things to be released and then have an up to date and comprehensive book?I also get the feeling that the author was targeting the topic not out of in-depth knowledge of the components, but more due to it being a hot topic and having some exposure to the components.That's just my opinion.
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