Book Image

Practical Cloud-Native Java Development with MicroProfile

By : Emily Jiang, Andrew McCright, John Alcorn, David Chan, Alasdair Nottingham
Book Image

Practical Cloud-Native Java Development with MicroProfile

By: Emily Jiang, Andrew McCright, John Alcorn, David Chan, Alasdair Nottingham

Overview of this book

In this cloud-native era, most applications are deployed in a cloud environment that is public, private, or a combination of both. To ensure that your application performs well in the cloud, you need to build an application that is cloud native. MicroProfile is one of the most popular frameworks for building cloud-native applications, and fits well with Kubernetes. As an open standard technology, MicroProfile helps improve application portability across all of MicroProfile's implementations. Practical Cloud-Native Java Development with MicroProfile is a comprehensive guide that helps you explore the advanced features and use cases of a variety of Jakarta and MicroProfile specifications. You'll start by learning how to develop a real-world stock trader application, and then move on to enhancing the application and adding day-2 operation considerations. You'll gradually advance to packaging and deploying the application. The book demonstrates the complete process of development through to deployment and concludes by showing you how to monitor the application's performance in the cloud. By the end of this book, you will master MicroProfile's latest features and be able to build fast and efficient cloud-native applications.
Table of Contents (18 chapters)
Section 1: Cloud-Native Applications
Section 2: MicroProfile 4.1 Deep Dive
Section 3: End-to-End Project Using MicroProfile
Section 4: MicroProfile Standalone Specifications and the Future

Consuming RESTful services with the MicroProfile Rest Client

Thus far, we've covered how we can design elaborate RESTful services and how we can easily transform JSON into Java objects and vice versa. Next up, we need to consume those services using the client APIs. In a microservice architecture, RESTful clients are critical for invoking remote services.

JAX-RS Client APIs

One way to consume RESTful services is with the JAX-RS Client APIs. Similar to JSON-P (as opposed to JSON-B), these APIs tend to be more programmatic with more control over individual options, such as headers, path construction, and so on. Let's take a look at some code using the thesaurus example from earlier in this chapter, as follows:

String uri = "http://localhost:9080/rest/thesaurus";
Client client = ClientBuilder.newBuilder().build();
WebTarget target =;
Builder builder = target.request(MediaType.TEXT_PLAIN);
try (Response response = builder.get(...