On a “vanilla” Spring WebFlux server (for example, no data access nor other optional dependencies), you can expect one thread for the server and several others for request processing (typically as many as the number of CPU cores). We should begin from the following fragment in Spring Framework Reference. Let’s take a closer look on the threading model realized by Spring WebFlux and Project Reactor. Without understanding how reactive framework handles threads, you won’t fully understand reactivity. In fact, the most important difference between synchronous and reactive frameworks is in their threading and concurrency model. It provides non-blocking and backpressure-ready TCP, HTTP, and UDP clients and servers. Reactor Netty is currently one of the most popular asynchronous event-driven applications framework. If you are building reactive applications with Spring WebFlux, typically you will use Reactor Netty as a default embedded server.
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