Introduction to SpringWebFlux

To enable us to build web-based services, SpringWebFlux offers the following programming models:

• Annotations: Annotations were originally part of the SpringMVC stack. These annotations are also supported by the SpringWebFlux framework. This is the easiest way of getting started with the SpringWebFlux stack.
• Functional endpoints: This model allows us to build Java 8 functions as web endpoints. The application can be configured as a set of routes, handlers, and filters. It then enables passing all of these as lambda functions in order to build the application in a functional paradigm.

In order to work with SpringWebFlux, we need to configure an underlying server. While writing this book, Netty, Tomcat, Jetty, and Undertow are the choices currently offered here. Netty is often used as the standard choice because it performs well for asynchronous, non...