Hi,
is possible to get the original value (old value) of the pojo before the update?
I saw that with the "dynamic update" flag Hibernate determines automaticaly which field is changed. Can I call this api programmatically?
Thanks

You could open a new (different) session and perform a session.get( ) or session.load( ) on the object using the class and primary key value to load the current persisted state of the object. You could also set the flush mode of the current session to FlushMode.COMMIT or FlushMode.NONE to allow dirty reads before performing the session.get( ) or session.load( ).
You can then do a comparison once you have loaded the old state.

I don't think that you can call the dynamic update API through the interfaces...you would have to cast the session to a SessionImpl, and even then the fields might be private. Take a look at the source code...

I wouldn't try any of these approaches unless you have a *very* compelling reason to look at the old state, and if that were the case, a Memento pattern implementation for your POJOs might be a better solution. Keep in mind that Hibernate manages a lot of stuff, and anything you try to manage in your code will possibly be in conflict with Hibernate and may have unpredictable (or at least undefined) results.

- Jesse

Take a look at the interceptor. There is a method on there, onFlushDirty() that contains the previous state. Not sure if this will help or not.

Well, then, that's much easier. I suppose I should actually look at the API before I open my mouth :)