考虑定义“com”类型的bean。问题管理。存储库。配置中的IssueHistoryRepository

Question

我得到这个错误。在这种情况下可以做什么？

申请无法启动

说明：com.issuemanagement.service.impl.中构造函数的参数0 Issue历史服务Impl需要一个无法找到的类型为“com.issuemanagement.repository.Issue历史存储库”的bean。

操作：考虑定义“com”类型的bean。问题管理。存储库。配置中的IssueHistoryRepository。

epository.java

public interface IssueHistoryRepository extends JpaRepository<IssueHistory, Long>{
    
}

问题历史ervice.java

public interface IssueHistoryService {
    
    IssueHistory save(IssueHistory issueHistory);
    
    IssueHistory getById(Long id);
    
    Page<IssueHistory> getAllPageable(Pageable pageable);
    
    Boolean delete(IssueHistory issueHistory);
}

IssueHistoryServiceImpl。Java语言

@Service
public class IssueHistoryServiceImpl implements IssueHistoryService {

    
    private final IssueHistoryRepository issueHistoryRepository;
    private final ModelMapper modelMapper;

    public IssueHistoryServiceImpl(IssueHistoryRepository issueHistoryRepository, ModelMapper modelMapper) {
        this.issueHistoryRepository = issueHistoryRepository;
        this.modelMapper = modelMapper;
    }
   
    @Override
    public IssueHistory save(IssueHistory issueHistory) {
        if(issueHistory.getDate()==null) {
            throw new IllegalArgumentException("Issue cannot be null");
        }
        issueHistory = issueHistoryRepository.save(issueHistory);
        return issueHistory;
    }

    @Override
    public IssueHistory getById(Long id) {
        
        return issueHistoryRepository.getOne(id);
    }

    @Override
    public Page<IssueHistory> getAllPageable(Pageable pageable) {
        
        return issueHistoryRepository.findAll(pageable);
    }

    @Override
    public Boolean delete(IssueHistory issueHistory) {
        
        issueHistoryRepository.delete(issueHistory);
        return Boolean.TRUE;
    }

}

IssueManagementApplication。Java语言

@SpringBootApplication
@ComponentScan({"com.issuemanagement"})
@EnableAutoConfiguration
public class IssueManagementApplication {

    public static void main(String[] args) {
        SpringApplication.run(IssueManagementApplication.class, args);
    }
    
    @Bean
    public ModelMapper getModelMapper() {
        return new ModelMapper();
    }

}

Answer 1

@SpringBootApplication封装了@Configuration、@EnableAutoConfiguration和@ComponentScan注释及其默认属性。@ComponentScan的默认值意味着扫描了@ComponentScan使用的包上的所有子包。这就是为什么在项目的基本包中包含主类通常是一种很好的做法。话虽如此，请从您的主类中删除@ComponentScan和@EnableAutoConfiguration如下：

@SpringBootApplication
public class IssueManagementApplication {

    public static void main(String[] args) {
        SpringApplication.run(IssueManagementApplication.class, args);
    }
    
    @Bean
    public ModelMapper getModelMapper() {
        return new ModelMapper();
    }
}