Pre-/PostUpdateEvents <- How to use the listener

Abram · **Joined:** Wed Apr 23, 2008 12:07 pm **Posts:** 22

Quote:

The idea is to implement a PreUpdateEventListener that creates a "backup" of the old object state before doing the actual update. The easiest approach is to use the "oldState" fields, supplied by the PreUpdateEvent to create this "historical" new entry

Trying to google it, trying to search all the forum inside here. Seems that many users already use these Pre and Post Update/Insert...Events. And I would like that, too. But I simply can´t find any piece of source that shows how to "register" the listener in a session or what to do that fires this event!? I dont have any hibernate.cfg.xml, just a persistence.xml and I am working with the EntityManager. I would be glad if anyone can help me out :)

carlolf · **Posted:** Sun May 04, 2008 3:53 pm

Hi Abram,

you can do it in "persistence.xml" like this:

Code:

<property name="hibernate.ejb.event.pre-insert" value="org.hibernate.validator.event.ValidateEventListener" />
<property name="hibernate.ejb.event.pre-update" value="org.hibernate.validator.event.ValidateEventListener" />

Carlo
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anshuiitk · **Joined:** Tue May 18, 2010 5:39 am **Posts:** 19

I have described how pre event listeners work in my blog http://anshuiitk.blogspot.com/2010/11/h ... event.html. These are just the basic concepts. Configurations you can find easily on the hibernate documentation. Let me know if I can answer more.