You will learn how to build and test a simple REST service with JAX-RS and JSON-B, which will expose the JVM’s system properties. The REST service will respond to GET requests made to the http://localhost:9080/LibertyProject/System/properties URL.

The service responds to a GET request with a JSON representation of the system properties, where each property is a field in a JSON object like this:

{
  "os.name":"Mac",
  "java.version": "1.8"
}

The design of an HTTP API is essential when creating a web application. The REST API has become the go-to architectural style for building an HTTP API. The JAX-RS API offers functionality for creating, reading, updating, and deleting exposed resources. The JAX-RS API supports the creation of RESTful web services that come with desirable properties, such as performance, scalability, and modifiability.

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