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Hibernate many-to-many mapping

I am one of hibernate user in Australia. Recently, I have been dealing with hibernate many-to-many mapping and not going well though. I got in trouble with "join/associate table with extra columns mapping".

Let`s say there are three tables called Product Order and OrderProduct (includes extra column quantity). Product holds many-to-many relationship with Order.

My confusion is that do we have to consider both ends of associate table when we are writing mapping files? or just write either side? Also, is it necessary to produce mapping file for the associate table as well?

Any suggestions will be appreciated!!

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