Hi Gordon,
I am working with Gustavo on this problem so I thought I'd answer your
questions. The version field is defined as:
@Version
private Long version;
(with normal getters and setters)
We are using SostgreSQL, and the database column is version, int8.
Thanks,
Ellen
Gordon Yorke wrote:
>Hello Gustavo,
> What is the version field in FileCategory being initialized to? What type is the version field?
>--Gordon
>
>-----Original Message-----
>From: gdurand_at_hmdc.harvard.edu [mailto:gdurand_at_hmdc.harvard.edu]
>Sent: Wednesday, September 27, 2006 5:57 PM
>To: persistence_at_glassfish.dev.java.net
>Subject: Trting to add new child entity; getting OptimisticLockException
>
>
>Hi,
>
>I'm am trying a very simple example and am getting a problem
>(I am using glassfish v2 milestone 1):
>
>Our DB has a Study entity which has a one to many relationship
>with a FileCategory entity.
>
>When I try to add a FileCategory to an existing study:
>
> Collection categories = study.getFileCategories();
>
> FileCategory c = new FileCategory();
> c.setName( "test" );
>
>
> c.setStudy(study);
> categories.add(c);
>
> em.merge(study);
>
>I am getting:
>
>Exception Details:
>oracle.toplink.essentials.exceptions.OptimisticLockException
> Exception Description: The object
>[edu.harvard.hmdc.vdcnet.study.FileCategory_at_1f1c748] cannot be merged
>because it has changed or been deleted since it was last read.
>{3}Class> edu.harvard.hmdc.vdcnet.study.FileCategory
>
>
>
>Any ideas why this is happening, since the FileCategory doesn't exist
>in the first place? (I have seen an example in the O'Reilly book that
>pretty much does just this)?
>
>Thanks,
>Gustavo
>
>
>
>
>
>