You're reading from Practical Cloud-Native Java Development with MicroProfile Develop and deploy scalable, resilient, and reactive cloud-native applications using MicroProfile 4.1

Product type Paperback

Published in Sep 2021

Publisher Packt

ISBN-13 9781801078801

Length 404 pages

Edition 1st Edition

Languages

Java

Tools

Microprofile

Concepts

Cloud Native

Authors (5):

Alasdair Nottingham

John Alcorn

David Chan

Emily Jiang

Andrew McCright

+1 more

View More author details

Table of Contents (18) Chapters

Preface

1. Section 1: Cloud-Native Applications

2. Chapter 1: Cloud-Native Applications FREE CHAPTER

3. Chapter 2: How Does MicroProfile Fit into Cloud-Native Application Development?

4. Chapter 3: Introducing the IBM Stock Trader Cloud-Native Application

5. Section 2: MicroProfile 4.1 Deep Dive

6. Chapter 4: Developing Cloud-Native Applications

7. Chapter 5: Enhancing Cloud-Native Applications

8. Chapter 6: Observing and Monitoring Cloud-Native Applications

9. Chapter 7: MicroProfile Ecosystem with Open Liberty, Docker, and Kubernetes

10. Section 3: End-to-End Project Using MicroProfile

11. Chapter 8: Building and Testing Your Cloud-Native Application

12. Chapter 9: Deployment and Day 2 Operations

13. Section 4: MicroProfile Standalone Specifications and the Future

14. Chapter 10: Reactive Cloud-Native Applications

15. Chapter 11: MicroProfile GraphQL

16. Chapter 12: MicroProfile LRA and the Future of MicroProfile

17. Other Books You May Enjoy

Managing life cycle and DI with CDI

By default, JAX-RS resources are created for each request. While this might be useful in some cases, it would be far more efficient if they were singletons. That way, we wouldn't be creating new object instances (an expensive operation) for each request, and we wouldn't be generating excess garbage after the request is completed.

While we could create an Application subclass that returns the resources via the getSingletons() method, that would prevent the container from automatically discovering and registering resources and providers. Another reason to avoid that approach is that the getSingletons() method is deprecated in a future version of JAX-RS and will eventually be removed.

Instead, we can use Context and Dependency Injection (CDI). CDI uses annotations to allow developers to declaratively manage object life cycles and perform injections of fields, constructors, and setter methods.