That is odd. Could you please include the full stack trace to the exception.
Also what about Timestamp locking does not work? It should work, as long as
you use a valid timestamp type in the database that stores milliseconds
correctly (what database and type are you using?).
Is the object you are merging new or existing?
Adam Bien wrote:
>
> Hi All,
>
> I'm testing now the optimistic concurrency behavior. All primitive
> datatypes seems to work fine:
>
> @Entity
> public class Entity{
>
> @Version
> private int version;
>
> }
>
> @Entity
> public class Entity{
>
> @Version
> private long version;
>
> }
>
> etc.
>
>
> However there is a problem with Long, Integer, Short, and bigger one
> with Timestamp.
>
> It seems to be necessary to initialize the Wrappers, otherwise I get an
> exception:
>
> "nested exception is: java.rmi.ServerException: RemoteException occurred
> in server thread; nested exception is: java.rmi.RemoteException: null;
> nested exception is: javax.persistence.OptimisticLockException:
> Exception [TOPLINK-5010] (Oracle TopLink Essentials - 2.0.1 (Build
> b03-fcs (04/05/2008))):
> oracle.toplink.essentials.exceptions.OptimisticLockException Exception
> Description: The object [Entity_at_1fc2f8c] cannot be merged because it has
> changed or been deleted since it was last read. {3}Class> Entity"
>
>
> already at the creation time.
>
> The workaround is simple - you have just to initialize the Wrapper at
> creation time:
>
> @Entity
> public class Entity{
>
> @Id
> @GeneratedValue
> private int id;
> @Version
> private Long version = new Long(0);
>
> }
>
>
> The intiialization shouldn't be necessary: ...= new Long(0);
>
> With Timestamp it seems not to work in general...
>
> I'm creating the objects with em#merge and not em#persist,
>
> regards,
>
> adam
>
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