public class Person {
Long id;
String name;
List addresses;
}

public class Address {
Long id;
String street;
Person person;
}

Legacy DB Schema:

Table: person

id
name


Table: person_addresses

person_id
address_id (unique)

Table: address
id
street

For MANY end I can do:

<bag name="addresses" table="person_addresses">
<key column="person_id"/>
<many-to-many class="Address" column="address_id"/>
</bag>

How can I map "person" attribute???

map it as a many to many, on the "one" side your collection will always have only one element... you can just add a business method that get this element