Hi to everybody

I have a little problem with hibernate that I havn't be able to solve despite of a lot of research.
I have in java a class 'article' an a few other class who inherit of 'article'.
Each class has its own table.
My problem is I'd like that, when I get the list of 'articles' via hibernate, it doesn't load all the contents of the tables that inherit of 'article'.
I thought that if I didn't mention to hibernate that there was inheritance it would be ok, but it isn't.
Does anybody know how to resolve this problem ?

Thank you in advance.