How can I check if an object is already persisted in the database ?
I want to do something like

Object obj ;
Session session ;

if ( ! obj.persistedInDatabase() )
{
session.save(obj);
}

Regards

Probably take a look at saveOrUpdate() it might be just what you are trying to do. Consider if you can check the saved-state using a property, eg. test for id==null or something. Otherwise try to load the object.

Maybe it seems strange, but if the object is alerady persisted I don't want to update it. So therefore I assume the method saveOrUpdate is not the right one to use.

Well so consider the other possiblitities. If you can check for id==null or something. Otherwise try to load the object from the db and see if you find it.

use session.get()

Thanks, I am using that. The "problem" is just that I have wrong version of Hibernate where the 2 get-methods in the API are not present in my version of Hibernate.

But anyway, thanks for the help !

You can still use find with an appropriate query.