Book Image

Spring 5.0 By Example

By : Claudio Eduardo de Oliveira
Book Image

Spring 5.0 By Example

By: Claudio Eduardo de Oliveira

Overview of this book

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.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Learning the basics of Docker


We learned about Docker concepts in Chapter 1, Journey to the Spring World. Now, it is time to test our knowledge and put it into practice. In the first part of this chapter, we will start MongoDB and Postgres instances to serve as a database for our application. We will configure connection settings in the application.

In the last part of this chapter, we will introduce the Maven plugin which provides an easy way to create Docker images via pom.xml with a couple of configurations on file. Finally, we will run our application in a Docker container. 

Preparing  MongoDB

Let's create our MongoDB container. We will use the official image provided by the Docker Hub.

First, we need to pull the image:

docker pull mongo:3.4.10

Then, we will see the Docker Engine downloading the image contents.

To create an isolation from our containers, we will create a separated network for our application and database. The network should use the bridge driver to allow the container communications...