In this section we'll see how to create a simple, scalable, and distributed application, using the building blocks of the Vert.x framework.
For the sake of simplicity in these examples, we are going to use Flickr REST API to demonstrate HTTP clients. This API is good for this purpose because it does not require authentication, and the examples can be copied, pasted, and run without the need to register for any API key.
A Vert.x application is often made up of multiple verticles. This is the way the framework guides the developer to break down the application logic into loosely coupled services.
Verticles are deployment units that run independently without a shared state. ...