Spring bootのビルドエラー

ログイン関連機能を実装しましたが、ビルド時にエラーが発生し
対象方法が不明のために質問させていただきます。

エラーメッセージ

ログは文字数制限上、各項目の上位の一部を除いて省略しています。

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loginController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userService': Unsatisfied dependency expressed through field 'repository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.example.todolist.entity.UserEntity com.example.todolist.repository.UserRepository.findByUsername(java.lang.String)! Unable to locate Attribute  with the the given name [username] on this ManagedType [com.example.todolist.entity.UserEntity]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userService': Unsatisfied dependency expressed through field 'repository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.example.todolist.entity.UserEntity com.example.todolist.repository.UserRepository.findByUsername(java.lang.String)! Unable to locate Attribute  with the the given name [username] on this ManagedType [com.example.todolist.entity.UserEntity]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.example.todolist.entity.UserEntity com.example.todolist.repository.UserRepository.findByUsername(java.lang.String)! Unable to locate Attribute  with the the given name [username] on this ManagedType [com.example.todolist.entity.UserEntity]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]

Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract com.example.todolist.entity.UserEntity com.example.todolist.repository.UserRepository.findByUsername(java.lang.String)! Unable to locate Attribute  with the the given name [username] on this ManagedType [com.example.todolist.entity.UserEntity]
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:96) ~[spring-data-jpa-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:103) ~[spring-data-jpa-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:209) ~[spring-data-jpa-2.2.6.RELEASE.jar:2.2.6.RELEASE]

Caused by: java.lang.IllegalArgumentException: Unable to locate Attribute  with the the given name [username] on this ManagedType [com.example.todolist.entity.UserEntity]
    at org.hibernate.metamodel.model.domain.internal.AbstractManagedType.checkNotNull(AbstractManagedType.java:147) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
    at org.hibernate.metamodel.model.domain.internal.AbstractManagedType.getAttribute(AbstractManagedType.java:118) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]

bundle.gradle

plugins {
	id 'org.springframework.boot' version '2.2.6.RELEASE'
	id 'io.spring.dependency-management' version '1.0.9.RELEASE'
	id 'java'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'

repositories {
	mavenCentral()
}

dependencies {
	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
	implementation 'org.springframework.boot:spring-boot-starter-web'
	testImplementation('org.springframework.boot:spring-boot-starter-test') {
		exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
	}
	compileOnly 'org.projectlombok:lombok:1.18.10'
	annotationProcessor 'org.projectlombok:lombok:1.18.10'
	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
	compile files('lib/ojdbc8.jar')

	implementation 'org.springframework.boot:spring-boot-starter-security'
	compile('org.springframework.security:spring-security-web')
	compile('org.springframework.security:spring-security-config')
	compile('org.thymeleaf.extras:thymeleaf-extras-springsecurity5')
}

loginController

package com.example.todolist.controller;

import com.example.todolist.form.SignupForm;
import com.example.todolist.service.UserService;
（省略）
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.validation.Valid;

@Controller
public class loginController {
    @Autowired
    UserService userService;

    @GetMapping("/signup")
    public String signup(Model model) {
        model.addAttribute("signupForm", new SignupForm());
        return "signup";
    }

    @PostMapping("/signup")
    public String signupPost(Model model, @Valid SignupForm signupForm, BindingResult bindingResult, HttpServletRequest request) {
        if (bindingResult.hasErrors()) {
            return "signup";
        }

        try {
            userService.registerUser(signupForm.getUsername(), signupForm.getPassword(), signupForm.getMailAddress());
        } catch (DataIntegrityViolationException e) {
            model.addAttribute("signupError", true);
            return "signup";
        }

        try {
            request.login(signupForm.getUsername(), signupForm.getPassword());
        } catch (ServletException e) {
            e.printStackTrace();
        }

        return "redirect:/messages";
    }

    @RequestMapping("/")
    public String index() {
        return "redirect:/messages";
    }
    @RequestMapping("/messages")
    public String messages() {
        return "messages";
    }

    @GetMapping("/login")
    public String login() {
        return "login";
    }

    @PostMapping("/login")
    public String loginPost() {
        return "redirect:/login-error";
    }

    @GetMapping("/login-error")
    public String loginError(Model model) {
        model.addAttribute("loginError", true);
        return "login";
    }
}

UserService

package com.example.todolist.service;

import com.example.todolist.entity.UserEntity;
import com.example.todolist.repository.UserRepository;
（省略）
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class UserService implements UserDetailsService {

    @Autowired
    private UserRepository repository;

    @Autowired
    private PasswordEncoder passwordEncoder;

    @Override
    public UserEntity loadUserByUsername(String username) throws UsernameNotFoundException {
        if (username == null || "".equals(username)) {
            throw new UsernameNotFoundException("Username is empty");
        }

        UserEntity user = repository.findByUsername(username);
        if (user == null) {
            throw new UsernameNotFoundException("User not found: " + username);
        }

        return user;
    }

    @Transactional
    public void registerAdmin(String username, String password, String mailAddress) {
        UserEntity user = new UserEntity(username, passwordEncoder.encode(password), mailAddress);
        user.setAdmin(true);
        repository.save(user);
    }

    @Transactional
    public void registerUser(String username, String password, String mailAddress) {
        UserEntity user = new UserEntity(username, passwordEncoder.encode(password), mailAddress);
        repository.save(user);
    }

}

調べてみるとパッケージ構成が悪くて、@SpringBootApplicationアノテーションが付いている
ソースから@serviceアノテーションを見つけられない場合
エラーになる現象もあるそうでしたので、パッケージ図も添付します。

私の場合も、上記のケースに該当するのでしょうか。
ご意見をお聞かせください。