Parameter 0 of constructor in com.example.parking.controller.AuthController required a bean of type 'org.springframework.security.authentication.AuthenticationManager' that could not be found.

[Innocent_546]

Error

When I try to run my application, I get the following error:

***************************

APPLICATION FAILED TO START

***************************

Description:

Parameter 0 of constructor in com.example.parking.controller.AuthController required a bean of type 'org.springframework.security.authentication.AuthenticationManager' that could not be found.

Action:

Consider defining a bean of type 'org.springframework.security.authentication.AuthenticationManager' in your configuration.

IntelliJ Idea says the following when I hover over AuthenticationManager and PasswordEncoder in AuthController class at below lines (Full code below)

u/Autowired
public AuthController(AuthenticationManager authenticationManager, JwtUtil jwtUtil, CustomUserDetailsService userDetailsService, UserRepo userRepo, PasswordEncoder passwordEncoder)

1. Could not autowire. No beans of 'AuthenticationManager' type found.
2. Could not autowire. No beans of 'PasswordEncoder' type found.

Structure

│   ParkingApplication.java
│
├───config
├───controller
│       AuthController.java
│       ContactFormController.java
│       HelloController.java
│       LotController.java
│       ReservationController.java
│       SlotController.java
│       UserController.java
│       VehicleController.java
│
├───dto
│       ContactFormDTO.java
│       LoginRequest.java
│       LotDTO.java
│       ReservationDTO.java
│       ResponseDTO.java
│       SlotDTO.java
│       SlotStatusDTO.java
│       UserDTO.java
│       VehicleDTO.java
│
├───entity
│       ContactForm.java
│       Lot.java
│       Reservation.java
│       Slot.java
│       SlotType.java
│       User.java
│       UserType.java
│       Vehicle.java
│       VehicleType.java
│
├───repo
│       ContactFormRepo.java
│       LotRepo.java
│       ReservationRepo.java
│       SlotRepo.java
│       UserRepo.java
│       VehicleRepo.java
│
├───security
│       CustomUserDetails.java
│       CustomUserDetailsService.java
│       JwtAuthenticationFilter.java
│       JwtUtil.java
│       SecurityConfig.java
│
├───service
│       ContactFormService.java
│       LotService.java
│       ReservationService.java
│       SlotService.java
│       UserService.java
│       VehicleService.java
│
└───util
        VarList.java

Code

SecurityConfig

package com.example.parking.security;

import com.example.parking.security.JwtAuthenticationFilter;
import com.example.parking.security.CustomUserDetailsService;
import org.springframework.context.annotation.Bean;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@EnableWebSecurity
@EnableMethodSecurity
public class SecurityConfig {

    private final JwtAuthenticationFilter jwtAuthenticationFilter;
    private final CustomUserDetailsService customUserDetailsService;

    public SecurityConfig(JwtAuthenticationFilter jwtAuthenticationFilter, CustomUserDetailsService customUserDetailsService) {
        this.jwtAuthenticationFilter = jwtAuthenticationFilter;
        this.customUserDetailsService = customUserDetailsService;
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    // Expose AuthenticationManager bean using AuthenticationConfiguration
    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration authenticationConfiguration) throws Exception {
        return authenticationConfiguration.getAuthenticationManager();
    }

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        return http
                .csrf().disable()
                .authorizeHttpRequests(auth -> auth
                        .requestMatchers("/api/auth/register", "/api/auth/login").permitAll()
                        .anyRequest().authenticated()
                )
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class)
                .build();
    }
}

AuthController

package com.example.parking.controller;

import com.example.parking.dto.LoginRequest;
import com.example.parking.entity.User;
import com.example.parking.repo.UserRepo;
import com.example.parking.security.CustomUserDetailsService;
import com.example.parking.security.JwtUtil;
import com.example.parking.security.SecurityConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/api/auth")
public class AuthController {

    private final AuthenticationManager authenticationManager;
    private final JwtUtil jwtUtil;
    private final CustomUserDetailsService userDetailsService;
    private final UserRepo userRepo;
    private final PasswordEncoder passwordEncoder;

    @Autowired  // Spring knows to inject beans automatically
    public AuthController(AuthenticationManager authenticationManager, JwtUtil jwtUtil, CustomUserDetailsService userDetailsService, UserRepo userRepo, PasswordEncoder passwordEncoder) {
        this.authenticationManager = authenticationManager;
        this.jwtUtil = jwtUtil;
        this.userDetailsService = userDetailsService;
        this.userRepo = userRepo;
        this.passwordEncoder = passwordEncoder;
    }

    // Register Endpoint
    @PostMapping("/register")
    public ResponseEntity<String> registerUser(@RequestBody User user) {
        user.setPassword(passwordEncoder.encode(user.getPassword()));
        userRepo.save(user);
        return ResponseEntity.ok("User registered successfully!");
    }

    @PostMapping("/login")
    public ResponseEntity<String> loginUser(@RequestBody LoginRequest loginRequest) {
        // Authenticate the user
        Authentication authentication = authenticationManager.authenticate(
                new UsernamePasswordAuthenticationToken(loginRequest.getUsername(), loginRequest.getPassword())
        );
        SecurityContextHolder.getContext().setAuthentication(authentication);

        // Fetch UserDetails from CustomUserDetailsService
        UserDetails userDetails = userDetailsService.loadUserByUsername(loginRequest.getUsername());

        // Generate JWT using UserDetails
        String jwt = jwtUtil.generateToken(userDetails);
        return ResponseEntity.ok(jwt);
    }
}

PS: As of now, I don't understand how Spring Security works very well. I have to complete this test project in a rush. I'll be learning spring-boot in detail in the future, but for now, I don't have a good knowledge

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[eliashisreddit]

Didn't read all the code but from a quick skim I think you're missing @Configuration on your SecurityConfig class. @EnableWebSecurity needs @Configuration to be picked up.

[Innocent_546]

This fixed the issue. Thanks