Spring Boot webapp中的Orika

Question

@Entity
public class Position {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String name;
    // getters/setters...
}

DTO：

public class PositionDto {

    private Integer id;
    private String name;
    // getters/setters...
}

Rest控制器：

@RestController
public class PositionController {

    @Autowired
    private PositionService positionService;

    @RequestMapping("/position")
    public PositionDto get() {
        final PositionDto positionDto = positionService.getPosition(1);
        return positionDto;
    }
}

服务类别：

@Service
public class PositionServiceImpl implements PositionService {

    @Autowired
    private PositionRepository positionRepository;
    @Autowired
    private OrikaBeanMapper mapper;

    @Transactional(readOnly = true)
    @Override
    public PositionDto getPosition(final Position.ID id) {
        // This returns a populated Position object with id=1 and name = "Creator"
        final Position position = positionRepository.findOne(id.getId());
        // This is where the mapping occurs
        return mapper.map(position, PositionDto.class);
    }
}

@Component
public class OrikaBeanMapper extends ConfigurableMapper implements ApplicationContextAware {        

    public OrikaBeanMapper() {
        super(false);
    }

    @Override
    protected void configureFactoryBuilder(final   DefaultMapperFactory.Builder factoryBuilder) {
        factoryBuilder.mapNulls(false);
    }
    // Omitted non-important methods

}

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is ma.glasnost.orika.MappingException: While attempting the following mapping:
sourceClass = class com.dlizarra.startuphub.position.Position
destinationType = com.dlizarra.startuphub.position.PositionDto
resolvedStrategy = InstantiateAndUseCustomMapperStrategy<Position, PositionDto> {customMapper: GeneratedMapper<Position, PositionDto> {usedConverters: [], usedMappers: [], usedMapperFacades: [], usedTypes: [] }, unenhancer: ma.glasnost.orika.unenhance.BaseUnenhancer@73c3e10e, objectFactory: DefaultConstructorObjectFactory<PositionDto>}
Error occurred: java.lang.ClassCastException: com.dlizarra.startuphub.position.Position cannot be cast to com.dlizarra.startuphub.position.Position
-----begin dump of current state-----------------------------
Registered object factories: 1 (approximate size: 110.8 kB)
    [PositionDto] : {Position=DefaultConstructorObjectFactory<PositionDto>}
-------------------------------------------------------------------------------
Registered mappers: 1 (approximate size: 17,643.0 kB)
    [0] : GeneratedMapper<Position, PositionDto> {usedConverters: [], usedMappers: [], usedMapperFacades: [], usedTypes: [] }
-------------------------------------------------------------------------------
Registered concrete types: 5 (approximate size: 294.3 kB)
  [interface java.util.List] : ArrayList<Object>
  [interface java.util.Set] : LinkedHashSet<Object>
  [interface java.util.Collection] : ArrayList<Object>
  [interface java.util.Map] : LinkedHashMap<Object, Object>
  [interface java.util.Map$Entry] : MapEntry<Object, Object>
  -------------------------------------------------------------------------------

Resolved strategies: 1 (approximate size: 19,850.8 kB)

{source: Position, dest: PositionDto, in-place:false}:  InstantiateAndUseCustomMapperStrategy<Position, PositionDto>
{customMapper: GeneratedMapper<Position, PositionDto> {usedConverters: [],    usedMappers: [], usedMapperFacades: [], usedTypes: [] }, unenhancer:
ma.glasnost.orika.unenhance.BaseUnenhancer@73c3e10e, objectFactory:
DefaultConstructorObjectFactory<PositionDto>}
-------------------------------------------------------------------------------
Unenhance strategy: ma.glasnost.orika.unenhance.BaseUnenhancer@73c3e10e
-----end dump of current state-------------------------------] with root cause
java.lang.ClassCastException: com.dlizarra.startuphub.position.Position cannot be cast to com.dlizarra.startuphub.position.Position
at ma.glasnost.orika.generated.Orika_PositionDto_Position_Mapper43322711137530$0.mapAtoB(Orika_PositionDto_Position_Mapper43322711137530$0.java) ~[orika-core-1.4.6.jar:na]
at ma.glasnost.orika.impl.mapping.strategy.UseCustomMapperStrategy.map(UseCustomMapperStrategy.java:67) ~[orika-core-1.4.6.jar:na]
at ma.glasnost.orika.impl.MapperFacadeImpl.map(MapperFacadeImpl.java:742) ~[orika-core-1.4.6.jar:na]

谢了！

Answer 1

自从几个月前Spring Boot 1.4.0（我相信是这个版本）引入了通过属性文件自定义开发工具的可能性以来，我才意识到有一个解决这个错误的方法。

为了解决这个问题，我们只需要：

1. 在src/main/resources中创建META-INF文件夹。
2. 在其中创建spring-devtools.properties文件。
3. 将restart.include.orika=/orika-core.*\.jar添加到文件中。