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Spring 5.0 By Example
Spring 5.0 By Example

Spring 5.0 By Example: Grasp the fundamentals of Spring 5.0 to build modern, robust, and scalable Java applications

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Spring 5.0 By Example

Starting in the Spring World – the CMS Application

Now, we'll create our first application; at this point, we have learned the Spring concepts, and we are ready to put them into practice. At the beginning of this chapter, we'll introduce the Spring dependencies to create a web application, also we know that Spring Initializr is a fantastic project that enables developers to create Spring skeleton projects, with as many dependencies as they want. In this chapter, we will learn how to put up our first Spring application on IDE and command line, expose our first endpoint, understand how this works under the hood, and get to know the main annotations of Spring REST support. We will figure out how to create a service layer for the CMS (Content Management System) application and understand how Dependency Injection works in a Spring container. We will...

Creating the CMS application structure

Now we will create our first application with the Spring Framework; we will create a basic structure for the CMS application with Spring Initializr. This page helps to bootstrap our application, it's a kind of guide which allows us to configure the dependencies on Maven or Gradle. We can also choose the language and version of Spring Boot.

The page looks like this:

In the Project Metadata section, we can put the coordinates for Maven projects; there is a group field which refers to the groupId tag, and we have artifacts which refer to the artifactId. This is all for the Maven coordinates.

The dependencies section enables the configuration of the Spring dependencies, the field has the autocomplete feature and helps developers to put in the correct dependency.

...

Running the application

Before we run the application, let's have a walk through our project structure. 

Open the project on IntelliJ IDEA using the Import Project or Open options (both are similar), the following page will be displayed:

Then we can open or import the pom.xml file.

The following project structure should be displayed:

Open the pom.xml, we have three dependencies, spring-boot-starter-thymeleafspring-boot-starter-webspring-boot-starter-test, and an interesting plugin, spring-boot-maven-plugin.

These starter dependencies are a shortcut for developers because they provide full dependencies for the module. For instance, on the spring-boot-starter-web, there is web-mvc, jackson-databind, hibernate-validator-web, and some others; these dependencies must be on the classpath to run the web applications, and starters...

Creating the REST resources

Now, we have an application up and running in this section, and we will add some REST endpoints and model some initial classes for the CMS application, the REST endpoints will be useful for the AngularJS integration.

One of the required characteristics for the APIs is the documentation, and a popular tool to help us with these tasks is Swagger. The Spring Framework supports Swagger, and we can do it with a couple of annotations. The project's Spring Fox is the correct tool to do this, and we will take a look at the tool in this chapter.

Let's do this.

Models

Before we start to create our class, we will add the Lombok dependency in our project. It is a fantastic library which provides some...

Adding service layer

Now, we have the skeleton for the REST layer ready, and in this section, we will start to create a service layer for our application. We will show how the Dependency Injection works under the hood, learn the stereotype annotations on Spring Framework and also start to think about our persistence storage, which will be presented in the next section.

Changes in the model

We need to make some changes to our model, specifically in the News class. In our business rules, we need to keep our information safe, then we need to review all the news. We will add some methods to add a new review done by a user, and also we will add a method to check if the news was reviewed by all mandatory reviewers...

Integrate with AngularJS

The AngularJS Framework has been becoming a trend for a few years, the community is super active, the project was created by Google.

The main idea of the framework is to help developers handle the complexities of the frontend layer, especially in the HTML part. The HTML markup language is static. It is a great tool to create static documents, but today it is not a requirement for modern web applications. These applications need to be dynamic. The UX teams around the world, work hard to create amazing applications, with different effects, these guys try to keep the applications more comfortable for the users.

AngularJS adds the possibility of extending the HTML with some additional attributes and tags. In this section, we will add some interesting behaviors on the frontend application. Let's do it.

...

Summary

In this chapter, we created our first Spring application. We saw Spring Initializr, the amazing tool that helps developers create the application skeleton.

We looked at how Spring works under the hood and how the framework got configured with a couple of annotations. Now, we have a basic knowledge of the Spring Bootstrap functions, and we can understand the Dependency Injection and component scan features present in the framework.

This knowledge is the basis for the next chapters, and now we are ready to start to work with more advanced features, such as persistence. Here we go. See you in the next chapter.

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Key benefits

  • • Learn reactive programming by implementing a reactive application with Spring Webflux
  • • Create a robust and scalable messaging application with Spring messaging support
  • • Apply your knowledge to build three real-world projects in Spring

Description

With growing demands, organizations are looking for systems that are robust and scalable. Therefore, the Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The book has three parts, where each one covers the building of a comprehensive project in Java and Spring. In the first part, you will construct a CMS Portal using Spring's support for building REST APIs. You will also learn to integrate these APIs with AngularJS and later develop this application in a reactive fashion using Project Reactor, Spring WebFlux, and Spring Data. In the second part, you’ll understand how to build a messaging application, which will consume the Twitter API and perform filtering and transformations. Here, you will also learn about server-sent events and explore Spring’s support for Kotlin, which makes application development quick and efficient. In the last part, you will build a real microservice application using the most important techniques and patterns such as service discovery, circuit breakers, security, data streams, monitoring, and a lot more from this architectural style. By the end of the book, you will be confident about using Spring to build your applications.

Who is this book for?

If you’re a developer starting out with Spring, then this book will help you learn about the new Spring 5.0 framework concepts followed by their implementation in Java and Kotlin. The book will also help experienced Spring developers gain insights into the new features added in Spring 5.0.

What you will learn

  • • Implement REST APIs with Spring REST support
  • • Introduce the Spring Boot and understand how it makes creating robust applications extremely simple
  • • Understand how Spring Data helps us add persistence in MongoDB and SQL databases
  • • Introduce Reactive Programming and use this with Spring Webflux
  • • Implement a Reactive REST client and learn how it can create asynchronous applications
  • • Create a robust, scalable, and fault tolerant application with Spring Messaging
  • • Implement a websocket to add interactive behaviors in your applications
  • • Introduce the Spring Cloud projects
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Length: 356 pages
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Table of Contents

10 Chapters
Journey to the Spring World Chevron down icon Chevron up icon
Starting in the Spring World – the CMS Application Chevron down icon Chevron up icon
Persistence with Spring Data and Reactive Fashion Chevron down icon Chevron up icon
Kotlin Basics and Spring Data Redis Chevron down icon Chevron up icon
Reactive Web Clients Chevron down icon Chevron up icon
Playing with Server-Sent Events Chevron down icon Chevron up icon
Airline Ticket System Chevron down icon Chevron up icon
Circuit Breakers and Security Chevron down icon Chevron up icon
Putting It All Together Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.7
(3 Ratings)
5 star 33.3%
4 star 0%
3 star 0%
2 star 33.3%
1 star 33.3%
Daniel de Souza Teixeira Apr 19, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is exactly what I expected. Easy to read and to follow the examples with new Spring features. I highly recommend!
Amazon Verified review Amazon
jay Jun 26, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
This book is littered with typos, run on sentences, and nonsensical phrasing. I am reading through it in an attempt to get the most I can out of it, but this feels like someone rushed the entire thing. There is valuable information in the book if you have the patience to read it. Was it worth paying for? Not really.
Amazon Verified review Amazon
Java Student Jun 15, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Amazon should not allow this type of books with big and unimplemented content of it. I wish i could my money get back. Not worthy at all.
Amazon Verified review Amazon
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