Hibernate 4/Spring 3.2 NonUniqueObjectException

Question

Okay, i am very very very new to Hibernate/Spring. I had to upgrade existing code from Hibernate 2 - Hibernate 4 and Spring 1 - Spring 3.

I keep getting this exception when trying to call saveOrUpdate when passing more than one message to the database (it works fine when I only send one message):

  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)

I have googled till I am blue in the face! I have tried to use merge(). This does not give the exception, but merge inserts NULL values into the Database.

I have tried to use evict(), flush(), same error.

This is the method that causes the error:

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();
    }
}

Any help would be greatly appreciated!

possible duplicate of - http://stackoverflow.com/questions/1074081/hibernate-error-org-hibernate-nonuniqueobjectexception-a-different-object-with ? — Ved, Nov 20 '12 at 09:20

score 0 · Answer 1 · answered Nov 20 '12 at 09:23

0

Can you please provide the mappings and the code which calls the saveOrUpdate methods. It looks like the error is in the code which calls the saveOrUpdate

answered Nov 20 '12 at 09:23

shashikanthb

379
2
9
21

This is it: `BulkmessageDAOIF bulkmessageDAO = DAOFactory.instance() .getBulkMessageDAO(); bulkmessageDAO.saveOrUpdate(reportBM);` I'll get the mappings as well – lulu88 Nov 20 '12 at 09:33
How is reportBM created? I mean how are the properties set on this object – shashikanthb Nov 20 '12 at 09:53
reportBM is an instance of the BulkMessage class with the values set. i printed the values and found that the is is 'null' - but some hibernate logging tells me it used a hibernate_sequence for that. – lulu88 Nov 20 '12 at 12:41
You are right. hibernate_sequence is used to generate the primary key for that entity/table. The primarykey column/property in your reportBPM class should be null if you want to insert and hibernate will generate the key using the sequence and then update the column. I would suggest you look at some hibernate examples. there are plenty of em available on the internet – shashikanthb Nov 22 '12 at 13:32

score 0 · Accepted Answer · answered Nov 20 '12 at 14:01

I solved it :)

I don't know if its the best solution, but it works for me and after 2 solid days of struggling I'm happy!

I removed Cascade from the parent object and explicitly called saveOrUpdate on parent and then on the children.

Thanks everyone for the help :)

Hibernate 4/Spring 3.2 NonUniqueObjectException

2 Answers2