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

Building services with MP GraphQL

In this section, we will learn how to develop a GraphQL application using the MP GraphQL APIs and runtime framework. We'll cover building queries and mutations, and how to invoke them using an interactive web tool called GraphiQL. We'll also cover entities and enumerated types. Finally, we'll cover a technique to reduce unnecessary server-side computations and deliver partial results.

Most GraphQL APIs for Java require you to write a schema first and then build the Java code around it. This approach tends to cause some level of dual maintenance, and it can slow down development as you evolve your application. MP GraphQL uses a code-first approach, meaning that you write the code using patterns similar to Jakarta RESTful Web Services (JAX-RS), and the framework generates the schema at runtime. This makes development and maintenance faster and easier. Let's start by building a basic Hello World query service.

Developing queries...