Hi All,

During a transaction i call entityManager.merge(<a entity class>), that time i get the below error. Can someone throw light on how to avaoid this error or reason behind this.

Thanks
-Vijay

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[Error] netxoffice.distworkflow.XlobSessionJPAService received unexpeced exception javax.persistence.PersistenceException: org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session:
javax.persistence.PersistenceException: org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [netxoffice.distworkflow.entity.XlDocument#netxoffice.distworkflow.entity.XlDocument@2f]
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:630)
at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:237)
at netxoffice.distworkflow.service.beans.XlobSessionJPAService.storeCollection(XlobSessionJPAService.java:550)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

you probably have a one to many with a composite primary key in the Child class. the error comes from the fact that the same primary key is already used for a different child object of the same parent.

i use only one class called XlDocument. However i tried using org.hibernate.Session.saveOrUpdate( xlDocument ). It worked without any errors. any reason?

-Thanks
-vijay