Book Image

Cloud-Native Applications in Java

By : Andreas Olsson, Ajay Mahajan, Munish Kumar Gupta, Shyam Sundar S
Book Image

Cloud-Native Applications in Java

By: Andreas Olsson, Ajay Mahajan, Munish Kumar Gupta, Shyam Sundar S

Overview of this book

Businesses today are evolving so rapidly that they are resorting to the elasticity of the cloud to provide a platform to build and deploy their highly scalable applications. This means developers now are faced with the challenge of building build applications that are native to the cloud. For this, they need to be aware of the environment, tools, and resources they’re coding against. If you’re a Java developer who wants to build secure, resilient, robust, and scalable applications that are targeted for cloud-based deployment, this is the book for you. It will be your one stop guide to building cloud-native applications in Java Spring that are hosted in On-prem or cloud providers - AWS and Azure The book begins by explaining the driving factors for cloud adoption and shows you how cloud deployment is different from regular application deployment on a standard data centre. You will learn about design patterns specific to applications running in the cloud and find out how you can build a microservice in Java Spring using REST APIs You will then take a deep dive into the lifecycle of building, testing, and deploying applications with maximum automation to reduce the deployment cycle time. Gradually, you will move on to configuring the AWS and Azure platforms and working with their APIs to deploy your application. Finally, you’ll take a look at API design concerns and their best practices. You’ll also learn how to migrate an existing monolithic application into distributed cloud native applications. By the end, you will understand how to build and monitor a scalable, resilient, and robust cloud native application that is always available and fault tolerant.
Table of Contents (20 chapters)
Title Page
Packt Upsell

Data update services

So far, we have looked at getting the data. Let's look at some of the data modification operations, such as creating, updating, and deleting (CRUD operations).

Given the popularity of REST for cloud-based API operations, we will do our data manipulation through REST methods.

Let's pick the HSQLDB example with Hazelcast that we worked on previously in this chapter.

REST conventions

The GET method was a no-brainer, but the choice of the methods for operations such as creating, inserting, and deleting require some deliberation. We will follow the conventions as per industry guidelines:


HTTP operation

Service method





Gets a product given an ID




Inserts the product and returns a new ID




Updates a product for a given ID with the data in the request body




Deletes the product with a provided ID


Let's look at the implementations in the ProductService class. We already...