Hello, I'm having trouble keeping track of object "modification" / "last update" times. Here's what I have:

----
@PreUpdate
@PrePersist
public void onUpdateExisting(){
setModificationTime(System.currentTimeMillis());
}
----

This seemed natural enough, but it's causing problems. Just the act of reading an object from the EntityManager, and making no changes to it whatsoever, will cause it to be updated with new values upon flush.. I can tell because both the ModificationTime is being updated to a new value AND my Version column is being incremented.

Again, no other properties of the object are being updated. The object is only being read from (other objects are being updated). But, when the flush happens, this "only read" object is being updated with a new modification time and version.

I'm sure there is a correct place to be doing this kind of thing in EJB3 but I don't know where it is. Any ideas?

Ryan

I removed my modification time update in the EJB3 callback as described above. However, the problem remains. Now, absolutely no columns are being updated by my code. Still, the simple act of reading the object from the database makes its version increment during the next flush / commit. This makes no sense to me. Why is the version being incremented when no changes are made to the object? For highly read objects, the version column's value is going to be out of control in no time... What am I missing here?

Ryan

Problem soved, was a wrong user type implementation.