Spring 5.0 By Example

Reactive types

There are two reactive types which represent the reactive sequences. The Mono objects represent a single value or empty 0|1. The Flux objects represent a sequence of 0|N items.

We will find many references in our code. The Spring Data reactive repository uses these abstractions in their methods. The findOne() method returns the Mono<T> object and the findAll() returns a Flux<T>. The same behavior we will be found in our REST resources.