I would like to be able to enable optimistic locking using a version column that contains a timestamp. Since we're using a legacy database that cannot be changed simply, we prefer using the existing timestamp column instead of introducing a new version index column. The application can be deployed on multiple instances on which the system time is not necessarily synchronized, so we need to fetch the current timestamp from the database. I'm using hibernate with annotations. My domain classes now simply contain:

This obviously works, but it uses the local system timestamp instead of fetching the database time. In a mapping file you can use source="db" as follows:

How can I configure the same thing using annotations?

From the documentation at http://docs.jboss.org/hibernate/core/3. ... ml#d0e5785



So I guess you shouldn't have to do anything (unless there is a bug in Hibernate or in the documentation). The strange thing is that if you are using a mapping file the default is source="vm".