好的,我非常非常 Hibernate / Spring新手。我不得不从Hibernate 2升级现有代码 - Hibernate 4和Spring 1 - Spring 3。
在向数据库传递多条消息时尝试调用saveOrUpdate时,我一直收到此异常(当我只发送一条消息时,它工作正常):
org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session
at org.hibernate.engine.internal.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:686)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:293)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:239)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:109)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:728)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:720)
at org.hibernate.engine.spi.CascadingAction$5.cascade(CascadingAction.java:258)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:380)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:323)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
at org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:423)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:264)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:136)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:204)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:189)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:114)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:728)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:720)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:716)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:352)
at $Proxy9.saveOrUpdate(Unknown Source)
我用Google搜索,直到我脸色发青!我试过使用merge()。这不会给出异常,但合并会将NULL值插入数据库。
我曾尝试使用evict(),flush(),同样的错误。
这是导致错误的方法:
public void saveOrUpdate(Object obj) {
Session session = null;
SessionFactory sf = getSessionFactory();
try {
try {
session = sf.getCurrentSession();
} catch (Exception e) {
session = sf.openSession();
}
System.out.println("Object: " + obj);
session.beginTransaction();
session.saveOrUpdate(obj);
session.getTransaction().commit();
System.out.println("DONE");
} catch (Exception e) {
e.printStackTrace();
}
}
非常感谢任何帮助!
答案 0 :(得分:0)
是否可以提供调用saveOrUpdate方法的映射和代码。看起来错误在调用saveOrUpdate
的代码中答案 1 :(得分:0)
我解决了它:)
我不知道它是否是最好的解决方案,但它对我有用,经过2天的努力,我很高兴!
我从父对象中删除了Cascade,并在父级上显式调用saveOrUpdate,然后在子级上调用。
感谢大家的帮助:)