Spring在服务中使用组件扫描字段userRepository配置bean。UserService需要类型为“repository”的bean

Question

我检查了许多例子，但它们通常是关于用@Repository或@Service等标记类...例如，这里是关于要扫描的包，我不确定我应该在哪里以及以哪种方法进行扫描。

我有一个简单的应用程序和一个用户模型，UserRepository扩展了JPA存储库和一个服务。当我尝试连接数据库时，默认设置是可以的，但每当我想使用自定义配置时，程序就找不到UserRepository类，即使我将其标记为@Repository。程序仍然需要存储库类配置bean。

以下是我的服务方法：

@Service
public class UserService {
    @Autowired
    UserRepository userRepository;
    public User findById(Long id) {
        return userRepository.findById(id).get();
    }
}

该模型是：

@AllArgsConstructor
@NoArgsConstructor
@Getter
@Builder
@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    private String name;
    private Date birthday;
}

用户存储库类：

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

以下是我试图实现的配置：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactory",
        transactionManagerRef = "transactionManager")
public class UserDbConfig {
    
    @Primary
    @Bean("dataSource")
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/testSchema");
        dataSource.setUsername("root");
        dataSource.setPassword("root");
        return dataSource;
    }
    
    @Primary
    @Bean(name = "entityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(
            EntityManagerFactoryBuilder builder,
            @Qualifier("dataSource") DataSource dataSource
    ) {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(true);

        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan("com.practice.multiDatabase.model");
        factory.setDataSource(dataSource());
        return factory;
    }
    
    @Bean("transactionManager")
    public PlatformTransactionManager transactionManager(@Qualifier("entityManagerFactory") EntityManagerFactory entityManagerFactory) {

        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(entityManagerFactory);
        return txManager;
    }
}

输出为：

***************************
APPLICATION FAILED TO START
***************************

Description:

Field userRepository in com.practice.multiDatabase.service.UserService required a bean of type 'com.practice.multiDatabase.repository.UserRepository' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'com.practice.multiDatabase.repository.UserRepository' in your configuration.

额外说明：每当我将此添加到main方法时

@SpringBootApplication(scanBasePackages = {
        "com.practice.multiDatabase.repository",
        "com.practice.multiDatabase.controller",
        "com.practice.multiDatabase.service",
        //"com.practice.multiDatabase.config"
        //, "com.practice.multiDatabase.model"
})
public class MultiDatabaseApplication {

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

}

程序正在工作，但可能忽略了配置文件，因为我已经显式地编写了controller服务存储库，如果我也取消了对配置文件夹的注释，那么仍然会出现相同的错误

Answer 1

我认为您错过了要创建的存储库的另一个重要注释。

@EntityScan({"com.practice.multiDatabase.model"})

然后可以找到您的实体模型，并成功创建您的存储库！