I want to make a relation (many to many) between two objects of the same class.
I already know that i need another table which contains two foreings key pointing to the id on the table.

yes...

Ok. the question is how i map this situation on the hbm.
I´ve got a set of element of the same class inside my class, but at the time to write the hbm i don´t know...

Please help..-

but the example shows two clasess, my problem is that i´ve got just one class..

Try it anyway :-) Hibernate doesn't so much care what's on each end of a mapping.

Cheers,
Rob