好吧，我对 Hibernate/Spring 非常非常非常。我必须从 Hibernate 2 - Hibernate 4 和 Spring 1 - Spring 3 升级现有代码。
在向数据库传递多条消息时尝试调用 saveOrUpdate 时，我不断收到此异常(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)
我用谷歌搜索直到我脸色发青!我尝试过使用 merge() 。这不会给出异常，但合并会将 NULL 值插入数据库。
我尝试过使用 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();
}
}
任何帮助将不胜感激!
最佳答案
您能否提供映射和调用 saveOrUpdate 方法的代码。看起来错误是在调用 saveOrUpdate 的代码中
关于java - Hibernate 4/Spring 3.2 NonUniqueObjectException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13469892/