Comments on: State Pattern Persistence with Hibernate

By: ilizhe

ilizhe — Mon, 15 Sep 2008 08:55:00 +0000

i got something useful from your blog. thank u

By: Anonymous

Anonymous — Thu, 21 Aug 2008 08:44:00 +0000

org.hibernate.MappingException: Could not determine type for: OrderStateUserType

where i have put OrderStateUserType when i have complicate structure?

By: Campbell

Campbell — Mon, 17 Mar 2008 09:43:00 +0000

Hi Joe. I too found this a useful piece based on attempting to implement the State Pattern from the book with the nice girl on the cover :O)

The problem I could not crack was the fact the pattern actually instantiates the states within the entity and passes a 'this' reference in to each state constructor.

You provide an alternative which is to pass the entity reference (e.g. Customer) in to the action method (e.g activate). A nice touch but I wish to retain the original pattern structure since it is cleaner for my requirement: my different states sometimes transition the entity state bit sometimes do not require to do so.

I cannot see any way to use Hibernate UserType to retain the exact pattern implementation but let me know if you think otherwise.

Cheers, Cam

By: Joe

Joe — Fri, 01 Feb 2008 04:05:00 +0000

Thanks for dropping by my blog.

> the EJB3 world is all a bit
> new to most of the
> development team

Hehe, just be thankful they don't have to learn EJB2!