我正在使用示例Spring Boot webapp将实体映射到DTO并使用Orika进行奇怪的ClassCastException。当我尝试在嵌入式Tomcat中部署的应用程序上进行映射时,我得到了异常,但我可以在JUnit测试上下文中完成映射。这是相关的课程(它们都非常简单):
JPA实体:
@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...
}
休息控制器:
@RestController
public class PositionController {
@Autowired
private PositionService positionService;
@RequestMapping("/position")
public PositionDto get() {
final PositionDto positionDto = positionService.getPosition(1);
return positionDto;
}
}
服务类:
@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);
}
}
OrikaBeanMapper类:
@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
}
这是ClassCastException的堆栈跟踪:
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]
我真的不知道这里发生了什么。我没有得到它试图将位置投射到位置的地方。每个实体/ dto类都会发生这种情况,而不仅仅是位置。
当我对任何方法进行单元测试时,我可以映射任何这些类没有问题,它可以正常工作并且所有字段都被正确映射,所以我不认为它是Orika配置问题。仅当我在嵌入式Tomcat中部署了webapp并且在其余控制器方法中调用映射方法时,才会发生异常。
它是一个简单的Spring Boot应用程序,这是我在其中编写的第一个休息端点。也许我在配置中遗漏了一些东西(我有@EnableAutoConfiguration所以没有那么多配置),但我无法猜测是什么让Orika抛出这个异常。
非常感谢任何有关此处可能发生的事情的想法或提示。
谢谢!
答案 0 :(得分:5)
我刚刚意识到这个错误的解决方法因为几个月前已经使用Spring Boot 1.4.0(我相信它是这个版本),当他们介绍了通过一个自定义Dev Tools的可能性属性文件。
要解决这个问题,我们只需:
META-INF
。src/main/resources
文件夹
spring-devtools.properties
文件。restart.include.orika=/orika-core.*\.jar
添加到文件中。正如Docs中所述,restart.include
将进入“重启”状态。 classloader任何匹配正则表达式的jar。所以我们要包含orika-core-1.4.6.jar
文件。