在Spring数据和Hibernate中使用JPararePository

Question

我一直在hibernate中使用Spring数据，我想知道避免代码浪费的最佳类组织是什么。这是我的实际结构：

    public interface FleetRepository extends JpaRepository<Fleet, Integer> {
}

然后我使用这个接口

public interface FleetServices {

     //Create one row into Fleet table, if id already exists this method executes an update
     public Fleet create(Fleet fleet);
     //Check if a fleet with given id already exists
     public boolean exists(int id);
}

因此我实现了它

@Service
public class FleetServicesImpl implements FleetServices{

    @Resource
    private FleetRepository fleetRepository;

    @Override
    @Transactional
    public Fleet create(Fleet fleet) {
         return fleetRepository.save(fleet);
    }

    @Override
    @Transactional
    public boolean exists(int id){
        return fleetRepository.exists(id);
    }
}

public interface GeneralRepository<T, Id extends Serializable> extends JpaRepository<T, Id> {
    }

public interface GeneralServices<T,Id> {
    //Create one row into T table, if id already exists this method executes an update
    public T create(T object);
    //Check if a row with given id already exists
    public boolean exists(Id id);
    //Find a row into T table by Id
    public T findById(Id id);
}

public class GeneralServicesImpl<T, Id extends Serializable > implements GeneralServices<T, Id> {

    @Resource
    private GeneralRepository<T,Id> generalRepository;

    @Override
    @Transactional
    public T create(T object) {
        return generalRepository.save(object);
    }

    @Override
    @Transactional
    public boolean exists(Id id) {
        return generalRepository.exists(id);
    }

    @Override
    @Transactional
    public T findById(Id id) {
        return generalRepository.getOne(id);
    }

}

@Service
public class FleetServicesImpl extends GeneralServicesImpl<Fleet, Integer> implements FleetServices  { 
}

@Service

公共类DatabaseServicesImpl实现DatabaseServices{

@Autowired
private FleetServices fleetServices;
@Autowired
private EcuServicesImpl ecuServices;

public DatabaseServicesImpl() {
}

@Override
public void archiveAcquisition() {
    ecuServices.create(new Ecu("MM"));
    Ecu ecuId=ecuServices.findById("MM");
    Fleet fleet=new Fleet(ecuId,"334","2.9",170,"5+","Full","4x2","MT");
    System.out.println(ecuId.getIdEcu());
    fleetServices.create(fleet);
}

}但我得到了这个例外

Answer 1

引用Oliver Gierke（Spring Data项目负责人）的话：

最后一个异常实际上表明JPA设置有问题。“不是托管bean”意味着JPA提供者不知道的类型。如果您正在设置一个基于Spring的JPA应用程序，我建议您在LocalContainerEntityManagerFactory上配置“PackageStoscan”属性，该属性已配置到包含JPA实体的包中。或者，您也可以在persistence.xml中列出所有实体类，但这通常比较麻烦。

确保您的Spring配置设置正确，似乎并不是所有类都被Spring识别。