MicroProfile Tutorial
This tutorial demonstrates the use of MicroProfile technologies for implementing a set of cloud-native microservices. The tutorial is made up of a number of Open Liberty Guides each of which demonstrates different MicroProfile technologies. Each Guide is designed to be taken independently so if you just want to learn about a specific technology you can just take that guide. If, however, you're goal is to learn about all the MicroProfile capabilities, then working through them in the order shown below is recommended.
Pre-requisites
To use these guides you need the following pre-requisites:
- A Java 8 JDK (e.g. https://adoptopenjdk.net/?variant=openjdk8-openj9)
- Apache Maven (https://maven.apache.org/)
- An editor with Java support (e.g. Eclipse, VS Code, IntelliJ)
Introduction
Cloud-native is an approach to application development and deployment. It's the product of a number of industry movements over the past 10-15 years - agile development practices, DevOps, Microservices and Cloud. Cloud-native applications are developed using agile practices, use continuous integration/continuous delivery to streamline deployment, are architected around team-aligned microservices, and leverage the cloud for rapid deployment at scale.
When choosing which technologies to use for cloud-native Microservices, the combination of open source and open standards can be very important. The combination enables a low cost (free) of entry and at the same time avoids being locked in to a single vendor implementation.
Eclipse MicroProfile is a set of industry specifications for developing and deploying cloud-native Java Microservices. The specifications address the important challenges of cloud-native microservices, such as toleration of service failures, security, service metrics and health, and more. Open Liberty is an open source, lightweight, composable Java server that implements the MicroProfile specifications.
This tutorial demonstrates how to address cloud-native microservice requirements using MicroProfile technology provided by Open Liberty. The tutorial guices can be taken independently, or in the order they are introduced, below.
If you have feedback on a specific guide, we'd appreciated a github issue or pull request against that guide, and similarly if you have feedback on this tutorial document, please raise an issue or submitt a pull request.
Creating a RESTful web service
Learn how to create a REST service with JAX-RS, JSON-P, and Open Liberty that will expose the JVM’s system properties.
The Guide: https://openliberty.io/guides/rest-intro.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-rest-intro
Injecting dependencies into microservices
Learn how to use Contexts and Dependency Injection to manage and inject dependencies into RESTful web services.
The Guide: https://openliberty.io/guides/cdi-intro.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-cdi-intro
Consuming RESTful services with template interfaces
Learn how to use MicroProfile Rest Client to invoke RESTful microservices over HTTP in a type-safe way.
The Guide: https://openliberty.io/guides/microprofile-rest-client.html
If you have feedback or find problems, please raise an issue here: https://github.com/openliberty/guide-microprofile-rest-client
Configuring Microservices
Learn how to inject external static and dynamic configuration to microservices using MicroProfile Config.
The Guide: https://openliberty.io/guides/microprofile-config.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-microprofile-config
Building fault-tolerant microservices with the @Fallback annotation
Learn how to use the MicroProfile Fault Tolerance specification to enable applications to function even when one of the microservices is unavailable.
The Guide: https://openliberty.io/guides/microprofile-fallback.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-microprofile-fallback
Securing microservices with JSON Web Tokens
You’ll explore how to control user and role access to microservices with MicroProfile JSON Web Token (MicroProfile JWT).
The Guide: https://openliberty.io/guides/microprofile-jwt.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-microprofile-jwt
Documenting RESTful APIs
Explore how to document and filter RESTful APIs from code or static files by using MicroProfile OpenAPI.
The Guide: https://openliberty.io/guides/microprofile-openapi.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-microprofile-openapi
Providing metrics from a microservice
Learn how to provide system and application metrics from a microservice using MicroProfile Metrics.
The Guide: https://openliberty.io/guides/microprofile-metrics.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-microprofile-metrics
Adding health reports to microservices
Learn how to provide and check the health of a microservice using MicroProfile Health.
The Guide: https://openliberty.io/guides/microprofile-health.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-microprofile-health
Enabling distributed tracing in microservices
Explore how to enable and customize tracing of JAX-RS and non-JAX-RS methods by using MicroProfile OpenTracing.
The Guide: https://openliberty.io/guides/microprofile-opentracing.html
If you have feedback or find problems, please raise an issue here: https://github.com/OpenLiberty/guide-microprofile-opentracing