Spring WebFlux

A new module introduced in Spring 5.0, Spring WebFlux, can be used to implement web applications built with Reactive Streams. These systems have nonblocking characteristics and are deployed in servers built on top of Netty, such as Undertown and servlet containers that support + 3.1.

Netty is an open source framework that helps developers to create network applications—that is, servers and clients using the asynchronous, event-driven pattern. Netty provides some interesting advantages, such as lower latency, high throughput, and less resource consumption. You can find more information at https://netty.io.

This module supports annotations based on Spring MVC modules, such as @GetMapping, @PostMapping, and others. This is an important feature that enables us to migrate to this new version. Of course, some adjustments are necessary, such as adding Reactor classes (Mono or Flux).

This module meets the modern web requirements to handle a lot of concurrent channels where the thread-per-request model is not an option.

We will learn about this module in Chapter 3, Adding Persistence with Spring Data and Putting it into Reactive Fashion and implement a fully Reactive application based on Reactive Streams.

Some common annotations are  @RequestMapping, @RestController, and   @RequestBody.
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