I have a java.util.Calendar object that needs to be used as a timestamp field for optimistic-lock. But if I try it directly, it throws an IllegalArgumentException: argument type mismatch.

It works if I use <version /> instead of <timestamp /> but I think <version /> populates it based on the previous value in the table, but timestamp uses absolute time. So it needs to be timestamp and not version.

Any ideas?

Apologies ... looks like I was wrong. It looks like they're exactly the same as per the following piece:



Source: http://docs.jboss.org/hibernate/stable/ ... -timestamp