注入 JpaRepository：使用名称创建 bean 时出错

Question

我在将 JpaRepository 正确注入数据提供者时遇到问题。

我将@EnableJpaRepositories 注释放在位于包中的EpisodieApiApplication.class 中：

包 pl.hypeapp.episodie;

@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackages = "pl.hypeapp.episodie.configuration")
@EnableAdminServer
@EnableJpaRepositories
public class EpisodieApiApplication extends SpringBootServletInitializer {

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

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    return builder.sources(EpisodieApiApplication.class);
     }
}

DatabaseDataProviderConfiguration.class 位于包中

包pl.hypeapp.episodie.configuration.dataprovider；

@Configuration
public class DatabaseDataProviderConfiguration {

   @Bean
   public TvShowDatabaseProvider tvShowDatabaseProvider(TvShowRepository tvShowRepository) {
   return new TvShowDatabaseProvider(tvShowRepository);
   }
}

TvShowRepository.class 位于包中

包 pl.hypeapp.episodie.dataproviders.database;

public interface TvShowRepository extends JpaRepository<TvShow, String> {
}

我的databaseprovider在模块application/dataproviders/database DatabaseDataProvider.class

public class TvShowDatabaseProvider implements DoesTvShowExist, GetTvShowFromDatabase, InsertTvShowToDatabase {

    private final TvShowRepository tvShowRepository;

    public TvShowDatabaseProvider(TvShowRepository tvShowRepository) {
        this.tvShowRepository = tvShowRepository;
    }
}

TvShow.class 位于包中：

包 pl.hypeapp.core.entity.tvmaze;

@JsonIgnoreProperties(ignoreUnknown = true)
@Data
@Entity
public class TvShow {

    @JsonProperty("id")
    public Integer id;
}

但是我收到了这个错误：

在类路径资源 [pl/hypeapp/episodie/configuration/dataprovider/DatabaseDataProviderConfiguration.class] 中定义名称为 'tvShowDatabaseProvider' 的 bean 创建错误：通过方法 'tvShowDatabaseProvider' 参数 0 表达的依赖关系不满足；嵌套异常是 org.springframework.beans.factory.BeanCreationException：创建名为“tvShowRepository”的 bean 时出错：调用 init 方法失败；嵌套异常是 java.lang.IllegalArgumentException: Not a managed type: class pl.hypeapp.core.entity.tvmaze.TvShow

github 的完整代码，但不完整，可能由于缺少类而无法工作

Answer 1

您正在使用构造函数注入来注入TvShowRepository bean，而您的TvShowDatabaseProvider 的构造函数缺少@Autowired，因此您需要添加它，如下所示：

public class TvShowDatabaseProvider implements 
             DoesTvShowExist, GetTvShowFromDatabase, 
             InsertTvShowToDatabase {

    private final TvShowRepository tvShowRepository;

    @Autowired //add this
    public TvShowDatabaseProvider(TvShowRepository tvShowRepository) {
        this.tvShowRepository = tvShowRepository;
    }
}

Answer 2

您没有扫描您的实体。您可以使用"pl.hypeapp" 作为@EnableJpaRepository 的基本包或使用@EntityScan：

@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackages = "pl.hypeapp.episodie.configuration")
@EnableAdminServer
@EnableJpaRepositories(basePackages = {"pl.hypeapp.episodie.dataproviders"})
@EntityScan(basePackages = {"pl.hypeapp.core.entity"})
public class EpisodieApiApplication extends SpringBootServletInitializer {

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

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    return builder.sources(EpisodieApiApplication.class);
     }
}