ok, this one is even stranger:
i just tried to load data from the problematic table using createCriteria(MyBean.class).

hibernate UPDATED! my table a few hundered times (probably once per row) during the list() call:

hstar.data.ArtikelEingangBean */ update
Artikeleingang
set
lieferung=?,
artikel=?,
bestellteMenge=?,
menge=?,
mwstProzent=?,
preisBrutto=?,
preisNetto=?
where
uid=?

what's going on here?

if you are changing the data at any point whatsoever in the POJOs before the transaction is closed, hibernate notices this and automatically persists those changes to the database.

i'm changing (converting) some values in my setter code, so that's the cause of the change.