I have the following problem with using Spring Data on EclipseLink - I use projections in order to get selected properties of the objects in database. I have an entity named "Campaign":
@Entity
@Table(name = "campaign")
public class Campaign implements Serializable {
@Id
@NotNull
private String id;
@NotNull
private CampaignState state = CampaignState.NEW;
// getters and setters...
}
CampaignState is some enum. Then, I added the following projection:
public interface CampaignStateView {
CampaignState getState();
}
...which I use in my repository:
public interface CampaignRepository extends
JpaRepository<Campaign, String>,
QuerydslPredicateExecutor<Campaign> {
@Query("SELECT DISTINCT c.state AS state FROM Campaign c")
List<CampaignStateView> findDistinctStates();
}
I use this repository in my service:
@ApplicationScoped
public class CampaignDataService {
private CampaignRepository campaignRepository;
// for CDI proxy
public CampaignDataService() {
}
@Inject
public CampaignDataService(CampaignRepository campaignRepository) {
this.campaignRepository = campaignRepository;
}
public Collection<CampaignState> findStates() {
return campaignRepository.findDistinctStates().stream()
.map(CampaignStateView::getState)
.collect(Collectors.toList());
}
}
But, unfortunately, when I call a method findStates() from the service, I get the following exception:
Caused by: org.springframework.beans.NotReadablePropertyException: Invalid property 'state' of bean class [campaign.CampaignState]: Could not find field for property during fallback access!
at org.springframework.data.util.DirectFieldAccessFallbackBeanWrapper.getPropertyValue(DirectFieldAccessFallbackBeanWrapper.java:58)
at org.springframework.data.projection.PropertyAccessingMethodInterceptor.invoke(PropertyAccessingMethodInterceptor.java:73)
at org.springframework.data.projection.ProjectingMethodInterceptor.invoke(ProjectingMethodInterceptor.java:64)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.ProxyProjectionFactory$TargetAwareMethodInterceptor.invoke(ProxyProjectionFactory.java:245)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy301.getState(Unknown Source)
at campaign.CampaignDataService$$Lambda$491.000000006DCDF7C0.apply(Unknown Source)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:204)
at java.util.Vector$VectorSpliterator.forEachRemaining(Vector.java:1451)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:523)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:513)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:719)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:245)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:510)
at campaign.CampaignDataService.findStates(CampaignDataService.java:153)
... 118 more
I get this error only on EclipseLink - on Hibernate everything works fine... Thank you in advance for any help!
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