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Spring Boot Reactive WebFlux

April 5, 2026

Reactive Programming

Non-blocking reactive web applications.

WebFlux Controller

@RestController
public class ReactiveController {
    @GetMapping("/products")
    public Flux getProducts() {
        return productService.findAll();
    }
    
    @GetMapping(value = "/stream", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public Flux streamEvents() {
        return Flux.interval(Duration.ofSeconds(1))
            .map(i - ServerSentEvent.builder("data").build());
    }
}

Reactive Stack

  • R2DBC (reactive database)
  • Reactive Redis/Mongo
  • WebClient (HTTP client)
  • Reactive security
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