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我正在爲Neo4j在Hibernate OGM實現上做POC。在這一過程中，我創建了以下對象：Neo4j中的對象繼承hibernate OGM
@Entity
public class AutoDealership {
private String name;
public AutoDealership(String nam){
this.name = nam;
}
@Id
public String getName(){
return name;
}
private void setName(String n){
name = n;
}
private List<Vehicle> vehicle = new ArrayList<Vehicle>();
@OneToMany(mappedBy="autoDealership")
public List<Vehicle> getVehicle(){
return vehicle;
}
private void setVehicles(List<Vehicle> v){
this.vehicle = v;
}
}
和車輛類：
public abstract class Vehicle {
protected AutoDealership autoDealership;
abstract int getValue();
@ManyToOne
public abstract AutoDealership getAutoDealership();
private void setValue(int v){
}
}
這是擴展到有簡單的實現類。我運行此代碼如下：
EntityManager em = emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
OgmSession session =em.unwrap(OgmSession.class);
Camry camry1 = new Camry("Joe");
Camry camry2 = new Camry("Elvis");
Silverado s = new Silverado("TX");
Maserati mas = new Maserati();
mas.setStatus("Massive");
session.saveOrUpdate(camry1);
session.saveOrUpdate(camry2);
session.saveOrUpdate(s);
session.saveOrUpdate(mas);
AutoDealership a = new AutoDealership("Slick Willie's");
session.saveOrUpdate(a);
camry1.setAutoDealership(a);
camry2.setAutoDealership(a);
mas.setAutoDealership(a);
s.setAutoDealership(a);
tx.commit();
em.close();
emf.close();
當我運行它，它失敗：
Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: ogm-neo4j] Unable to build Hibernate SessionFactory
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:1239)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.access$600(EntityManagerFactoryBuilderImpl.java:120)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:855)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:845)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:398)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:844)
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:75)
at org.hibernate.ogm.jpa.HibernateOgmPersistence.createEntityManagerFactory(HibernateOgmPersistence.java:62)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
at dogs.TestClass.main(TestClass.java:22)
Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: cars.AutoDealership.vehicle[cars.Vehicle]
at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1134)
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:793)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:728)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:70)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1697)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1426)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1846)
如果我註釋掉與從AutoDealership獲取車輛什麼，代碼編譯和作品，成功地將節點插入到數據庫中。我試圖改變mappedBy目標無濟於事。