Orika ClassCastException in Spring Boot webapp

Question

I got a weird ClassCastException when matching an entity with a DTO with Orika in the Spring Boot webapp sample I'm working on. I get an exception when I try to match in a deployed application in the built-in Tomcat, but I can make the mapping just fine in the context of the JUnit test. These are the corresponding classes (they are all very simple):

JPA Essence:

@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... } 

Stop Controller:

 @RestController public class PositionController { @Autowired private PositionService positionService; @RequestMapping("/position") public PositionDto get() { final PositionDto positionDto = positionService.getPosition(1); return positionDto; } } 

Class of service:

 @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); } } 

Class OrikaBeanMapper:

 @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 a stacktrace 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 don’t know what is going on here. I do not understand where he is trying to relate the position to the position. This happens with every entity / dto class, not just a position.

I can match any of these classes without problems, when I test the module using any method, it works fine and all fields are displayed correctly, so I don't think this is Orika's configuration problem. An exception occurs only when I have a webapp deployed in the built-in Tomcat, and the mapping method is called as part of the residual controller method.

This is a simple Spring boot application, and this is the first resting point I wrote in it. Maybe I'm missing something in the configuration (I have @EnableAutoConfiguration, so not much to configure), but I can't figure out what Orika is throwing this exception.

Any ideas or tips on what might happen here would be greatly appreciated.

Thanks!

Answer 1

I just realized that a workaround for this error, starting from a few months ago, was using Spring Boot 1.4.0 (I believe this version) when they introduced the ability to configure Dev Tools through the properties file.

To solve this problem, we just need to:

• Create the META-INF folder in src/main/resources .
• Create a spring-devtools.properties file in it.
• Add restart.include.orika=/orika-core.*\.jar to the file.

As pointed out in the Docs , restart.include will pull any jar matching Regex into the 'restart' classloader. Therefore, we include the file orika-core-1.4.6.jar , for example.