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Mastering Spring 5.0
Mastering Spring 5.0

Mastering Spring 5.0: Master reactive programming, microservices, Cloud Native applications, and more

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Mastering Spring 5.0

Dependency Injection

Any Java class we write depends on other classes. The other classes a class depends on are its dependencies. If a class directly creates instances of dependencies, a tight coupling is established between them. With Spring, the responsibility of creating and wiring objects is taken over by a new component called the IoC container. Classes define dependencies and the Spring Inversion of Control (IoC) container creates objects and wires the dependencies together. This revolutionary concept, where the control of creating and wiring dependencies is taken over by the container, is famously called IoC or dependency injection (DI).

In this chapter, we start with exploring the need for DI. We use a simple example to illustrate the use of DI. We will understand the important advantages of DI--easier maintainability, less coupling and improved testability. We will explore...

Understanding dependency injection

We will look at an example to understand dependency injection. We will write a simple business service that talks to a data service. We will make the code testable and see how proper use of DI makes the code testable.

The following is the sequence of steps we will follow:

  1. Write a simple example of a business service talking to a data service. When a business service directly creates an instance of a data service, they are tightly coupled to one another. Unit testing will be difficult.
  2. Make code loosely coupled by moving the responsibility of creating the data service outside the business service.
  3. Bring in the Spring IoC container to instantiate the beans and wire them together.
  4. Explore the XML and Java configuration options that Spring provides.
  5. Explore Spring unit testing options.
  6. Write real unit tests using mocking.
...

Summary

Dependency injection (or IoC) is the key feature of Spring. It makes code loosely coupled and testable. Understanding DI is the key to making the best use of Spring Framework.

In this chapter, we took a deep look at DI and the options Spring Framework provides. We also looked at examples of writing testable code and wrote a couple of unit tests.

In the next chapter, we will shift our attention toward Spring MVC, the most popular Java web MVC framework. We will explore how Spring MVC makes the development of web applications easier.

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Key benefits

  • Explore the new features and components in Spring
  • Evolve towards micro services and cloud native applications
  • Gain powerful insights into advanced concepts of Spring and Spring Boot to develop applications more effectively
  • Understand the basics of Kotlin and use it to develop a quick service with Spring Boot

Description

Spring 5.0 is due to arrive with a myriad of new and exciting features that will change the way we’ve used the framework so far. This book will show you this evolution—from solving the problems of testable applications to building distributed applications on the cloud. The book begins with an insight into the new features in Spring 5.0 and shows you how to build an application using Spring MVC. You will realize how application architectures have evolved from monoliths to those built around microservices. You will then get a thorough understanding of how to build and extend microservices using Spring Boot. You will also understand how to build and deploy Cloud-Native microservices with Spring Cloud. The advanced features of Spring Boot will be illustrated through powerful examples. We will be introduced to a JVM language that’s quickly gaining popularity - Kotlin. Also, we will discuss how to set up a Kotlin project in Eclipse. By the end of the book, you will be equipped with the knowledge and best practices required to develop microservices with the Spring Framework.

Who is this book for?

This book is for an experienced Java developer who knows the basics of Spring, and wants to learn how to use Spring Boot to build applications and deploy them to the cloud.

What you will learn

  • Explore the new features in Spring Framework 5.0
  • Build microservices with Spring Boot
  • Get to know the advanced features of Spring Boot in order to effectively develop and monitor applications
  • Use Spring Cloud to deploy and manage applications on the Cloud
  • Understand Spring Data and Spring Cloud Data Flow
  • Understand the basics of reactive programming
  • Get to know the best practices when developing applications with the Spring Framework
  • Create a new project using Kotlin and implement a couple of basic services with unit and integration testing
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 28, 2017
Length: 496 pages
Edition : 1st
Language : English
ISBN-13 : 9781787123175
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Product Details

Publication date : Jun 28, 2017
Length: 496 pages
Edition : 1st
Language : English
ISBN-13 : 9781787123175
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Frequently bought together


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Total 120.97
Mastering Spring 5.0
€41.99
Spring 5.0 Microservices
€41.99
Learning Spring Boot 2.0
€36.99
Total 120.97 Stars icon

Table of Contents

13 Chapters
Evolution to Spring Framework 5.0 Chevron down icon Chevron up icon
Dependency Injection Chevron down icon Chevron up icon
Building a Web Application with Spring MVC Chevron down icon Chevron up icon
Evolution toward Microservices and Cloud-Native Applications Chevron down icon Chevron up icon
Building Microservices with Spring Boot Chevron down icon Chevron up icon
Extending Microservices Chevron down icon Chevron up icon
Advanced Spring Boot Features Chevron down icon Chevron up icon
Spring Data Chevron down icon Chevron up icon
Spring Cloud Chevron down icon Chevron up icon
Spring Cloud Data Flow Chevron down icon Chevron up icon
Reactive Programming Chevron down icon Chevron up icon
Spring Best Practices Chevron down icon Chevron up icon
Working with Kotlin in Spring Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.7
(3 Ratings)
5 star 33.3%
4 star 33.3%
3 star 0%
2 star 33.3%
1 star 0%
Satish Sep 10, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Hmmm
Amazon Verified review Amazon
Prakash Oct 08, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I recommend all to must read this book. Title says it's about spring but it is much more than just spring. You will learn lot about Microservices and other big data messaging tools.But "Mastering" term in this books title is quite misleading. If you are an architect or a experienced Spring programmer, then you will find this book a very basic for others it's must read.
Amazon Verified review Amazon
Jarid P. Jul 16, 2018
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
I am a software engineer by profession, I picked up this book thinking it would be a nice addition to my Spring library unfortunately this book falls short in several areas. First, coverage of material is lacking. There is no depth to the context of what you are learning, for example when talking about application context, literally there is like 5 sentences going over it and most of its just about small code snippets, nothing to tie things together into the bigger picture which is Spring. Second, material is littered with typos which makes reading with comprehension slower because you have to back track a lot wondering why the last statement you read makes no sense. Lastly, the code examples seem a bit hacked and definitely incomplete with files titled "...BeforeRefactoring". All things said, despite any emotional dissatisfaction I might have with spending money for this book, but purely on content, completeness, and learning experience I wouldn't recommend this book to anyone looking to learn Spring.
Amazon Verified review Amazon
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