[hibernate-dev] JPA2 locking

[Emmanuel Bernard]

On 20 oct. 09, at 17:16, Scott Marlow wrote:

>
> In our JPA 1 support, LockModeType of READ is implemented with  
> LockMode.UPGRADE (pessimistic lock is obtained).  With the above  
> proposal, this would change in our JPA 2 implementation to use an  
> optimistic lock (just read version at load time and validate that  
> version didn't change at commit time).
>
> In our JPA 1 support, LockModeType of WRITE is implemented with  
> LockMode.FORCE (pessimistic lock is obtained with version  
> incremented).  With the above proposal, this would change in our JPA  
> 2 implementation to use same as OPTIMISTIC_FORCE_INCREMENT above.

Correct, we were overly secure and we need to document the behavioral  
change of our impl.