Question

我在我的项目中使用JPA 2.0。

我和实体子类AppEntity扩展了AbstractEntity。

AbstractEntity与@MappedSuperClass一起映射，它具有

@Id
@Column(name ="OBJID")
private String objId;

@Column
...(other entities)
along with getters and setters for objId and other attributes.

在我的子类AppEntity中，所有setter方法都被覆盖。子类实体没有任何属性（@Id / @Column映射）。

使用hibernate 4.2.6部署此应用程序时

我得到ArrayIndexOutOfBoundException，因为org.hibernate.cfg.AnnotationBinder在服务器启动时检查

private static PropertyData getUniqueIdPropertyFromBaseClass(
            .....
    //Id properties are on top and there is only one
            return baseClassElements.get( 0 );
}

由于子类实体没有任何属性，get（0）抛出Outofbound异常。

但是上面的代码在JPA 1.0中起作用，因为hibernate 3.5没有上面的检查。

在JPA 2.0中是否对子类实体有任何限制？检查AnnotationBinder.java getUniqueIdPropertyFromBaseClass方法中的属性背后的逻辑。

https://github.com/hibernate/hibernate-orm/blob/4.2/hibernate-core/src/main/java/org/hibernate/cfg/AnnotationBinder.java

添加StackTrace以供参考

AnnotationBinder.getUniqueIdPropertyFromBaseClass(PropertyData, PropertyData, AccessType, Mappings) line: 2576  
AnnotationBinder.isIdClassPkOfTheAssociatedEntity(ElementsToProcess, XClass, PropertyData, PropertyData, AccessType, Map<XClass,InheritanceState>, Mappings) line: 925  
AnnotationBinder.mapAsIdClass(Map<XClass,InheritanceState>, InheritanceState, PersistentClass, EntityBinder, PropertyHolder, ElementsToProcess, Set<String>, Mappings) line: 824    
AnnotationBinder.bindClass(XClass, Map<XClass,InheritanceState>, Mappings) line: 671    
Configuration$MetadataSourceQueue.processAnnotatedClassesQueue() line: 3533 
Configuration$MetadataSourceQueue.processMetadata(List<MetadataSourceType>) line: 3487  
Configuration.secondPassCompile() line: 1376    
Configuration.buildSessionFactory(ServiceRegistry) line: 1777   
EntityManagerFactoryImpl.<init>(PersistenceUnitTransactionType, boolean, Class, Configuration, ServiceRegistry, String) line: 94    
Ejb3Configuration.buildEntityManagerFactory(BootstrapServiceRegistryBuilder) line: 920  
Ejb3Configuration.buildEntityManagerFactory() line: 904 
HibernatePersistence.createContainerEntityManagerFactory(PersistenceUnitInfo, Map) line: 92 
PersistenceUnitServiceImpl.createContainerEntityManagerFactory() line: 200  
PersistenceUnitServiceImpl.access$600(PersistenceUnitServiceImpl) line: 57  
PersistenceUnitServiceImpl$1.run() line: 99 
ThreadPoolExecutor$Worker.runTask(Runnable) line: 886   
ThreadPoolExecutor$Worker.run() line: 908   
JBossThread(Thread).run() line: 619 
JBossThread.run() line: 122

没有属性的实体子类

0 个答案: