创建名为“userRepository”的 bean 时出错：FactoryBean 在创建对象时引发异常

Question

我有一个错误，我不知道为什么？ 我使用 Spring Boot Spring Security + JWT 编写了一个登录名。 但是我有一个奇怪的存储库错误。

我已经尝试这样做了几个小时，但我已经没有力气了。 我不知道这很重要，但我用作基础 PostgreSQL

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.Optional com.tiscode.xxxxx_api.repository.UserRepository.findByName(java.lang.String)! No property name found for type User!
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:176) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1828) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1265) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:624) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:612) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:51) ~[spring-data-commons-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:36) ~[spring-data-commons-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at 

存储库接口

@Repository
public interface UserRepository extends JpaRepository<User, Long> {

    Optional<User> findByName(String user);

我的 UserDetalsServiceImp

   @Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    UserRepository userRepository;

    @Override
    @Transactional
    public UserDetails loadUserByUsername(String userName) throws UsernameNotFoundException {
        User user = userRepository.findByName(userName)
                .orElseThrow(() -> new UsernameNotFoundException("User Not Found with username: " + userName));

        return UserDetailsImpl.build(user);
    }

}

还有我的实体用户类

@Entity
@Table(name = "Users")
public class User {

    @Id
    @GeneratedValue
    private Long id;
    private String email;
    private String userName;
    private String password;
    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable( name = "user_roles",
            joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id"))
    private Set<UserRole> userRoles = new HashSet<>();

    public User(String username, String email, String password) {
        this.userName = username;
        this.email = email;
        this.password = password;
    }

    public User() {
    }

....

Answer 1

User对象上的属性称为userName ，而不是name 。

这就是 Spring 抱怨“找不到用户类型的属性名称！”的原因。

请尝试以下操作：

public interface UserRepository extends JpaRepository<User, Long> {
    Optional<User> findByUserName(String user);
}

Answer 2

首先请重命名方法和参数。 应该：

Optional<User> findByUserName(String userName);

并请删除“@Repository”注释