I guess you could use a revisions-of-entity query, specifying restrictions on the number of revision.
Thanks for your reply, but ...
as far as I understand the revisions-of-entity query needs a class for an entity. What I need is an overview of data for more than one entity-class, for example at timestamp1 userdata has changed, at timestamp2 address data has changed, ... so as a result at least a list of timestamps, ids and an entity classes.
Yeah that's true, you need a class. I don't see a way to do for many classes at one time. The same way you can't really query for non-associated classes at one time either (in normal Hibernate).