What HibernateObjectOptimisticLockingFailureException is mean?

[zerg78]

Hi all!
I have changed stored early persistent object, and afer update execution I have next exceptions:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeLoadException: Could not load type 'Spring.Dao.ObjectOptimisticLockingFailureExceptio n' from assembly 'Spring.Data, Version=1.1.0.2, Culture=neutral, PublicKeyToken=null'.
at Spring.Data.NHibernate.SessionFactoryUtils.Convert HibernateAccessException(HibernateException ex)
at Spring.Data.NHibernate.HibernateAccessor.ConvertHi bernateAccessException(HibernateException ex) in c:\projects\Spring.Net.Integration\projects\Spring .Data.NHibernate\src\Spring\Spring.Data.NHibernate \Data\NHibernate\HibernateAccessor.cs:line 434
at Spring.Data.NHibernate.HibernateTemplate.Execute(I HibernateCallback action, Boolean exposeNativeSession) in c:\projects\Spring.Net.Integration\projects\Spring .Data.NHibernate\src\Spring\Spring.Data.NHibernate \Data\NHibernate\HibernateTemplate.cs:line 864
at Spring.Data.NHibernate.HibernateTemplate.SaveOrUpd ate(Object entity) in c:\projects\Spring.Net.Integration\projects\Spring .Data.NHibernate\src\Spring\Spring.Data.NHibernate \Data\NHibernate\HibernateTemplate.cs:line 610
at Spring.Data.NHibernate.Generic.HibernateTemplate.S aveOrUpdate(Object entity) in c:\projects\Spring.Net.Integration\projects\Spring .Data.NHibernate12\src\Spring\Spring.Data.NHiberna te12\Data\NHibernate\Generic\HibernateTemplate.cs: line 555

1) Where I can find class Spring.Dao.ObjectOptimisticLockingFailureExceptio n?
2) What reason of this error?

Thanks

[zerg78]

Problem have resolved by usage HibernateTemplate.SaveOrUpdateCopy
instead HibernateTemplate.SaveOrUpdate.

[Mark Pollack]

Glad you figured it out, sorry couldn't help in a more timely manner.
Mark