There are various ways in which you can host your Web API, and you need not always have to host your Web API in IIS. You can host it in a separate process as well.

This step-by-step JAX-RS RESTful web service example in Java using Eclipse and TomEE Plus will get you up to speed on modern web service development techniques in less than 15 minutes. Prerequisites ...

See also: How to use classes in Java To see this in action, we need to find a Web API that we can use readily. In this example, we will be using JSON Placeholder.