I'm having a weird ClassCastException while mapping an entity to a DTO with Orika in a sample Spring Boot webapp I'm working on. I get the exception when I attempt to do the mapping on the deployed app in embedded Tomcat, but I can do the mapping just fine in a JUnit test context. This are the relevant classes (they are all very simple):
JPA entity:
@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 controller:
@RestController
public class PositionController {
@Autowired
private PositionService positionService;
@RequestMapping("/position")
public PositionDto get() {
final PositionDto positionDto = positionService.getPosition(1);
return positionDto;
}
}
Service class:
@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 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
}
And this is the stacktrace of the ClassCastException:
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]
I really have no idea what's going on here. I don't get where it is trying to cast Position to Position. This happens with every entity/dto class, not just with Position.
I can map any of those classes with no problem when I am unit testing any method, it works perfectly and all the fields get mapped correctly, so I don't think it's an Orika configuration issue. The exception only occurs when I have the webapp deployed in embedded Tomcat and the mapping method gets called within the rest controller method.
It's a simple Spring Boot application and this is the first rest endpoint I wrote in it. Maybe I am missing something in the configuration (I have @EnableAutoConfiguration so there's not that much to configure), but I can't guess what is making Orika throw this exception.
Any ideas or hints about what might be happening here would be very much appreciated.
Thanks!
