SpringBoot variable injection error. Error Statement: Required type:javax.management.relation.Role

Question

I'm using SpringBoot 3.2.2 and implementing social login using OAuth2. While writing CustomOAuth2UserService, an error occurred in the process of setting permissions. Below is the body of the code.

@Slf4j
@Service
@RequiredArgsConstructor
public class CustomOAuth2UserService implements OAuth2UserService<OAuth2UserRequest, OAuth2User> {

    private final UserRepository userRepository;

    private static final String NAVER="naver";
    private static final String KAKAO="kakao";

    @Override
    public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2AuthenticationException {
        log.info("CustomOAuth2UserService.loadUser() Run - Enter OAuth2 login request");

/*
* Create a DefaultOAuth2UserService object, create a DefaultOuth2User object through loadUser(userRequest), and return it
* The loadUser() of the DefaultOAuth2UserService sends a request to the user information provider URI of the social login API
* After obtaining user information, create a DefaultOAuth2User object through it and return it.
* As a result, the OAuth2User contains user information obtained from the OAuth service
*/
        OAuth2UserService<OAuth2UserRequest, OAuth2User> delegate = new DefaultOAuth2UserService();
        OAuth2User oAuth2User = delegate.loadUser(userRequest);

/*
* Extract registrationId from userRequest and save SocialType to registrationId
* * http://localhost:8080/oauth2/authorization/kakao에서 kakao가 registrationId
* The userNameAttributeName is later set to nameAttributeKey.
*/

        String registrationId = userRequest.getClientRegistration().getRegistrationId();
        SocialType socialType = getSocialType(registrationId);
        String userNameAttributeName = userRequest.getClientRegistration()
                .getProviderDetails().getUserInfoEndpoint().getUserNameAttributeName();
        // The value that becomes the key (PK) at the time of OAuth2 login

        Map<String, Object> attributes = oAuth2User.getAttributes(); // Json value of userInfo provided by API in social login (user information)

        //  Create OAuthAttributes objects through user information according to socialType
        OAuthAttributes extractAttributes = OAuthAttributes.of(socialType, userNameAttributeName, attributes);

        User createdUser = getUser(extractAttributes, socialType); 

        // Create and return Custom OAuth2User objects that implement DefaultOuth2User
        return new CustomOAuth2User(
                Collections.singleton(new SimpleGrantedAuthority(createdUser.getRole().getKey())),
                attributes,
                extractAttributes.getNameAttributeKey(),
                createdUser.getEmail(),
                createdUser.getRole() //!!!!!error!!!!!
        );
    }
}

On the last line, Required type:javax.management.relation.Role Provided:com.Next.enums.Role error statement occurs.

In addition, User class block is below

package com.Next.domain;

import com.Next.enums.SocialType;
import com.Next.enums.Role;
import jakarta.persistence.*;
import lombok.*;
import org.springframework.security.crypto.password.PasswordEncoder;

@Entity
@Builder
@Getter
@AllArgsConstructor
@NoArgsConstructor(access = AccessLevel.PROTECTED)
@Table(name = "USERS")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="user_id")
    private Long id;

    private String email;
    private String password;
    private String nickname;

    @Enumerated(EnumType.STRING)
    private Role role;

    @Enumerated(EnumType.STRING)
    private SocialType socialType; // KAKAO, NAVER, GOOGLE

    private String socialId; // Identifier value of the logged-in social type

    private String refreshToken;//refrsh token

    //user authorize method: GUEST,USER.-->enumerated
    //Initial login-> GUEST, after additional info->update to USER 
    public void authorizeUser() {
        this.role = com.Next.enums.Role.USER;
    }

    //password Encoding method
    public void passwordEncode(PasswordEncoder passwordEncoder){
        this.password=passwordEncoder.encode(this.password);
    }

    public void updateRefreshToken(String updateRefreshToken){
        this.refreshToken=updateRefreshToken;
    }

}

I was expecting 'getRole()' import User's Role. I don't know why the user class email is called normally, but the role is not called. I'd appreciate it if you could help me!!