java - 无法@Autowire存储库接口(interface)Spring Boot

Question

我面临的问题是关于@Autowire存储库接口(interface)(在我的例子中是UserRepository)，我不知道为什么，但是@Autowire失败了.

UserController 类调用 @Service 类，该类调用 @Component (DAO 类)，DAO 类是 @Autowiring @Repository。

Spring启动主

package com.leagueofsummoners;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.context.embedded.ErrorPage;
import org.springframework.boot.orm.jpa.EntityScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.http.HttpStatus;

import com.leagueofsummoners.persistence.interfaces.UserRepository;

@SpringBootApplication
public class LeagueofsummonersApplication {
    public static void main(String[] args) {
        SpringApplication.run(LeagueofsummonersApplication.class, args);
    }

    @Bean
    public EmbeddedServletContainerCustomizer containerCustomizer() {
        return (container -> {
            ErrorPage error401Page = new ErrorPage(HttpStatus.UNAUTHORIZED, "/401.html");
            ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/404.html");
            ErrorPage error500Page = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500.html");

            container.addErrorPages(error401Page, error404Page, error500Page);
        });
    }
}

DTO 类(实体)

@Entity(name = "user")
@Table(name = "users")
public class UserDTO implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@Column(name = "id_user")
private Long idUser;

@Column(nullable = false, name = "summoner_name")
private String summonerName;
@Column(nullable = false)
private String username;
@Column(nullable = false)
private String password;
@Column(nullable = false)
private String email;
@Column(nullable = false)
private String avatar;
@Column(nullable = false)
private String firma;
@Column(nullable = false, name = "permission_level")
private PermissionLevels permissionLevel;

public UserDTO() {
}

存储库界面

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.repository.Repository;

import com.leagueofsummoners.model.dto.UserDTO;

@org.springframework.stereotype.Repository
public interface UserRepository extends Repository<UserDTO, Long> {

    Page<UserDTO> findAll(Pageable pageable);

    UserDTO findByUsernameIgnoringCase(String username);

    UserDTO findByIdUser(int idUser);
}

DAO 类( Autowiring 存储库类时失败)

@Component
public class UserDAO{

    @Autowired
    private UserRepository userRepository;

    public UserDTO findByUsernameIgnoringCase(String username) {
        return this.userRepository.findByUsernameIgnoringCase(username);
    }
}

Here's a link with the log of the console

Answer 1

您需要扫描 JpaRepositories 在您的应用程序类上添加此注释:

@EnableJpaRepositories("com.leagueofsummoners.persistence.interfaces")

编辑:

为了配置entityManager，您需要添加以下依赖项:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

如果您添加此依赖项，它将自动为您配置存储库，因此您无需添加@EnableJpaRepositories。