问题描述
原始问题源自于此问题:
The original question stems from this question:
为什么此JPA 2.0映射在Eclipse/JBoss Tools中给我一个错误?
如您所见，这个星座也怪异了Eclipse Dali JPA验证器. JPA规范似乎允许这样做(有点可靠):
As you can see this constellation also freaks out the Eclipse Dali JPA validator. The JPA spec seems to allow this as seen here (somewhat reliable):
第一个问题中发布的确切代码也引发了Hibernate MappingException:
The exact code posted in the first question also raises a Hibernate MappingException:
Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: geoareas] Unable to configure EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:374)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
at tld.geoareas.Main.main(Main.java:69)
Caused by: org.hibernate.MappingException: property [_tld_geoareas_model_Zip__identifierMapper.country] not found on entity [tld.geoareas.model.Country]
at org.hibernate.mapping.PersistentClass.getRecursiveProperty(PersistentClass.java:378)
at org.hibernate.cfg.annotations.TableBinder.bindFk(TableBinder.java:414)
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:115)
at org.hibernate.cfg.Configuration.processEndOfQueue(Configuration.java:1550)
at org.hibernate.cfg.Configuration.processFkSecondPassInOrder(Configuration.java:1473)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1389)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1345)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1477)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:193)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:1096)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:278)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:362)
... 4 more
Caused by: org.hibernate.MappingException: property [_tld_geoareas_model_Zip__identifierMapper.country] not found on entity [tld.geoareas.model.Country]
at org.hibernate.mapping.PersistentClass.getRecursiveProperty(PersistentClass.java:424)
at org.hibernate.mapping.PersistentClass.getRecursiveProperty(PersistentClass.java:375)
... 15 more
我对递归属性"特别恼火.毕竟，它只是对GeoAreas子表Countrys的UNIQUE，NOT NULL CHAR(2)列的简单单列引用.请注意，继承可能会在这里产生一些影响，但它仍然不是IMHO过于复杂.
I'm especially irritated by the "recursive property". After all, it's just a simple single-column reference to a UNIQUE, NOT NULL CHAR(2) column of a GeoAreas sub table Countries. Note the inheritance might have some impact here, but it's still not overly complicated IMHO.
那么，这是一个Hibernate错误吗?
So, is this a Hibernate bug?
推荐答案
回答我自己的问题:
这不是Hibernate中的错误.当同时用作派生标识符时，JPA 2.0规范禁止引用非PK列.有关更多详细信息，请参见此处的其他答案:
It's not a bug in Hibernate. It's the JPA 2.0 spec that prohibits references to non-PK columns when used as a derived identifier at the same time. See my other answer here for more details:
为什么此JPA 2.0映射在Eclipse/JBoss Tools中给我一个错误?
请注意，这还会导致EclipseLink的映射异常(您将获得更有意义的堆栈跟踪):
Note it's also causing a mapping exception with EclipseLink (you just get a more meaningful stack trace):
Exception Description: The derived composite primary key attribute [country] of type [java.lang.String] from [tld.geoareas.model.ZipId] should be of the same type as its parent id field from [tld.geoareas.model.Country]. That is, it should be of type [java.lang.Integer].
at org.eclipse.persistence.exceptions.ValidationException.invalidDerivedCompositePKAttribute(ValidationException.java:1134)
at org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor.validateDerivedPKClassId(MetadataDescriptor.java:1817)
at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ObjectAccessor.processId(ObjectAccessor.java:450)
at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ObjectAccessor.processOwningMappingKeys(ObjectAccessor.java:659)
at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ManyToOneAccessor.process(ManyToOneAccessor.java:110)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.processDerivedId(ClassAccessor.java:1409)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processDerivedId(EntityAccessor.java:823)
at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processAccessorsWithDerivedIDs(MetadataProject.java:1294)
at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage3(MetadataProject.java:1560)
at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:484)
at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:453)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1080)
... 6 more
这篇关于休眠:将引用映射到子表的备用/自然键列时出错?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！