clientID

clientSecret

Gain insights into building e-commerce apps using Spring Boot and reactive programming. Learn about WebFlux, MongoDB, hypermedia APIs, RSockets, OpenID, and testing methodologies.

tarball.tar.gz

Run spring

ch1 run

ch1 run-test

PoliteRestaurant

PoliteRestaurant-copy

sdk-copy

operations with spring boot

operations with spring boot-dockerbuild

operations with spring boot-spring-boot:build-image

operations with spring boot-run

operations with spring boot-prepare_package

ch1 run-blockhound

rserver-run

rserver-rclient-run

9_quick

9_repo

9_custom_config

9_method_security

rserver-rclient-run-marvah

operations with spring boot-run-old-for-creating-API

operations with spring boot-run-old-for-creating-API-copy-faizan-way-correct

operations with spring boot-prepare_package-tmux-test

rserver-rclient-run-copy

rserver-rclient-run-copy-testing

rserver-rclient-run-copy-testing-copy

9_custom_config-added_user

9_oauth

packge-command

operations with spring boot clean package

9_oauth-copy-test

ch1 run-reactor tools

ch1 run-copy-watcher

rserver-rclient-run-copy-testing-channel-curl

search

In this course, you will learn about the Spring Boot framework and build an e-commerce web application using reactive programming. You will find that some of the newest ideas in Spring Boot are applied to some well-seasoned favorite problems that Java developers have experience with.

The course approaches these old problems with new concepts and more efficient tools. You’ll learn reactive programming, WebFlux, and the basic project structure of a Spring Boot application. Next, you’ll cover data access with MongoDB, developer tools, and testing applications with Spring Boot. Then, you’ll learn the operational features, building hypermedia APIs, reactive streams, messaging,  RSockets, and OpenID, all from the most pragmatic standpoints.

After finishing the course, you'll be able to build state of the art web applications using Spring Boot and MongoDB. You'll also learn the art of writing test cases, become proficient in building APIs, and much more.

Build E-Commerce Apps with Reactive Programming in Spring Boot

# Why we use Spring Initializr

We actually don’t have to rummage around on a search engine or StackOverflow to get off the ground. There’s a website geared toward getting us started. [**Spring Initializr**](https://start.spring.io)lets us enter the basic details of our project, pick our favorite build system and the version of Spring Boot we want, and select all the dependencies we need. Then, a ZIP file is generated containing our application, ready to go!

Spring Initializr is a user-friendly application that generates the Spring Boot project with the option of adding all the dependencies we need.


Let’s start by picking “Maven Project.” Then, select the latest version as the version of Spring Boot we wish to use. Any version above 2.3 works, but be sure to use a final release version, not a SNAPSHOT or MI version.


>**Note**: Since this course is built on JAVA 11, be sure  to select that when choosing a Java version in Spring Initializr.


Under the section labeled “Project Metadata,” enter the following details:


* **Group:** `com.greglturnquist`
* **Artifact:** `hackingspringbootreactive`
* **Name:** `Hacking with Spring Boot`
* **Description:** `Demo project for Hacking with Spring Boot`
* **PackageName:** `com.greglturnquist.hackingspringboot`

This is enough to get things moving. However, we’re free to add more metadata or sift through the stack of supported features. Simply click “ADD DEPENDENCIES” and scroll through the options.

Now we can pick what we want our application to do. Some important technologies are:

* `Spring Web`: A traditional, imperative-based Spring MVC web stack
* `Spring Reactive Web`: A reactive Streams-based Spring WebFlux web stack

>**Note**: This site has many overrides. We can switch from building a **Java Archive (JAR)** to a **Web Application Archive (WAR)**. We can opt for any newest stable release for JAVA. Unless we have an explicit requirement, such as deploying to an older container, JAR is the best option.


To build our e-commerce platform, clear out the selected modules and select the following items:

* `Spring Reactive Web` (Spring WebFlux + embedded Netty) 
* `Thymeleaf` (template engine)

With these items selected, click “Generate Project.”


>**Note**: When working locally on our computer, many tools leverage the Spring Initializr site. **IntelliJ IDEA** and the **Spring Tool Suite** both make it possible to create new projects inside the IDE. We have access to the same options shown above. They invoke the website’s REST API and import our new project. We can even use cURL or HTTPie on the command line!


Here’s a sample ZIP file that we get after generating the project:



Learn how to install and use Spring Initializr.


Spring Initializr

Learn how to install and use Spring Initializr.

Getting Started

Building a Web App with Spring Boot

Data Access with Spring Boot

Developer Tools for Spring Boot

Testing with Spring Boot

Operations with Spring Boot

Building APIs with Spring Boot

Messaging with Spring Boot

RSocket with Spring Boot

Securing Our Application with Spring Boot

Epilogue

Appendix

Spring Initializr

Why we use Spring Initializr