Hi everyone!
Inspired by Pinaki Poddar's blog about auditing I try to implement an auditing
facility. I came across some weird (at least for me ;)) behaviour when using
the SaveFieldManager to access the old state of an object: getState() returns
'null'. Why is that?
I get the 'null' state in the following situation:
Class A has a list of class B.
I add an instance of B to A's list.
I get a notification in my @PreUpdate method that A was changed. But when I ask
the SaveFieldManager for the old state I get 'null'.
I saw that StaetManagerImpl creates an instance of my SaveFieldManager passing
'null' as a parameter:
Line 2828 of that class look like this:
> // don't bother creating the save field manager if we're not going to
> // save the old field value anyway
> if (_saved == null) {
> if (_loaded.get(field))
> _saved = new SaveFieldManager(this, null, _dirty);
> else
> return;
> }
I know using some non-public classes from the kernel might go along with new
problems. On the other hand I like the approach described in the blog.
I use OpenJPA 2.1.0.
Any recommendations or hints?
Cheers,
Christopher
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