Injection dependency

AuthController.java

package com.example.demo.controller;

import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class AuthController {
    private final UserService userService;
    
    public AuthController(UserService getUserService) {
        this.userService = getUserService;
    }
    @GetMapping("/me")
    public ResponseEntity getUserInfo() {
            if (userService.isAuthenticated()) {
            return ResponseEntity.ok("Returned user information");
        }

        return ResponseEntity.ok("Unauthorized");
    }
}

UserService.java

public interface UserService {
    Boolean isAuthenticated();
}

UserServiceImpl.java

package com.example.demo.service;

import org.springframework.stereotype.Service;

//@Service
public class UserServiceImpl implements UserService {
    @Override
    public Boolean isAuthenticated() {
        return true;
    }
}

WebConfiguration.java

package com.example.demo.config;

import com.example.demo.service.UserService;
import com.example.demo.service.UserServiceImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class WebConfiguration {
 @Bean
 public UserService getUserService() {
     return new UserServiceImpl();
 }
}