HTTP Response Exception Handling in Spring 5 Reactive

Question

I\'m developing some reactive microservices using Spring Boot 2 and Spring 5 with WebFlux reactive starter.

I\'m facing the following problem: I want to handle all HTTP

Answer 1

I think what you are looking for is WebFluxResponseStatusExceptionHandler the check this for reference.

In the WebHandler API, a WebExceptionHandler can be used to to handle exceptions from the chain of WebFilter's and the target WebHandler. When using the WebFlux Config, registering a WebExceptionHandler is as simple as declaring it as a Spring bean, and optionally expressing precedence via @Order on the bean declaration or by implementing Ordered.

This example may help, have not tried it myself.

@Component
@Order(-2)
class RestWebExceptionHandler implements WebExceptionHandler{

    @Override
    public Mono handle(ServerWebExchange exchange, Throwable ex) {
        if (ex instanceof PostNotFoundException) {
            exchange.getResponse().setStatusCode(HttpStatus.NOT_FOUND);

            // marks the response as complete and forbids writing to it
            return exchange.getResponse().setComplete();
        }
        return Mono.error(ex);
    }
}

class PostNotFoundException extends RuntimeException {
    PostNotFoundException(String id) {
        super("Post:" + id + " is not found.");
    }
}