I write this

Iterator i = session.iterate("from JPPricelist");
XRecordSet headpricelists = RecordBeanMapper.iterateBeanToXRecordSet(i);
ctx.setAttribute("pricelists", headpricelists);

And i have in JPPricelist a property that is a collection. I map this collection as lazy=true but when I extract the object from the iterator (and only when i extract object from iterator) hibernate initialize the collection also if i don't use it!

How can i resolve the problem of initialize collection only when I call method getRows();

You are mistaken. Hibernate does not do this. Use your debugger to find where *your* code invokes the collection wrapper.