在WebFlux中，无功控制器onErrorResume不工作

return Mono.just("Hello")
    .map(value -> {
        if (value.equals("Hello")) {
            throw new IOException("Simulated error");
        }
        return value;
    })
    .onErrorResume(IOException.class, e -> Mono.just("Default response"));

return Mono.just("Hello")
    .map(value -> {
        if (value.equals("Hello")) {
            throw new RuntimeException("Simulated error");
        }
        return value;
    })
    .onErrorResume(e -> Mono.just("Default response"));

return Mono.just("Hello")
    .doOnError(e -> System.out.println("Error caught by doOnError: " + e.getMessage()))
    .map(value -> {
        if (value.equals("Hello")) {
            throw new RuntimeException("Simulated error");
        }
        return value;
    })
    .onErrorResume(e -> Mono.just("Default response"));

import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Mono;

public class MyHandler {

    public Mono<ServerResponse> handleRequest(ServerRequest request) {
        return Mono.just("Hello")
            .map(value -> {
                if (value.equals("Hello")) {
                    throw new RuntimeException("Simulated error");
                }
                return value;
            })
            .onErrorResume(e -> Mono.just("Default response"))
            .flatMap(responseValue -> ServerResponse.ok().bodyValue(responseValue));
    }
}