I am working on a little project, that sends emails automaticaly to an emailadress.

I am using Spring Boot, with Spring Security.

Basically I have this class:

package com.birthdayz.web;

import com.birthdayz.domain.service.MailSendingService;
import com.birthdayz.domain.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.security.oauth2.client.authentication.OAuth2AuthenticationToken;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.reactive.function.client.WebClient;
import com.birthdayz.domain.model.User;

@Controller
public class MailController {

    @Autowired
    MailSendingService mailSendingService;

    @Autowired
    UserService userService;

    @GetMapping("/send")
    public void sendMail(OAuth2AuthenticationToken auth) {
        System.out.println("request to /send success");
        User loggedUser = userService.findUserBy(auth.getPrincipal().getAttribute("login"));

        if (loggedUser == null) {
            System.err.println("Fehler: Kein Benutzer in der Session gefunden.");
        }

        mailSendingService.sendMail(loggedUser);
    }


    @Scheduled(fixedRate = 5000)
    public void sendRequest() {
        WebClient.create()
                .get()
                .uri(uriBuilder -> uriBuilder
                        .scheme("http")
                        .host("localhost")
                        .port(8080)
                        .path("/send")
                        .build())
                .retrieve()
                .bodyToFlux(String.class)
                .doOnError(error -> System.err.println("Fehler beim Abrufen der URL: " + error.getMessage()))
                .doOnNext(response -> System.out.println("Antwort erhalten: " + response))
                .subscribe();
    }
}

My Idea is that I just simply schedule a GET-Request to /send every x seconds. But it doesnt work and I have tried building up the webClient many ways.

When I go to the browser http://localhost:8080/send, the email gets send away like wished.

Can somebody help me udnerstand this problem?