How to add extra columns in many to many join table in hbm.xml : hibernate?

Question

Possible Duplicate:
Can add extra field(s) to @ManyToMany Hibernate extra table?

Here is my problem,is there any way to add extra columns in many to many join table using hbm.xml files in hibernate. Just like:

Create table employee(
emp_id int primary key,
emp_name varchar(50)
);

Create table address(
address_id int primary key,
address varchar(500)
);

Create table employee_address(
emp_id int,
address_id int,
/********** this is an extra column **********/
no_of_letters_sent int,

foreign key(emp_id) references employee(emp_id),
foreign key(address_id) references address(address_id)
);

How to make hbm.xml files for third table?

Answer 1

I don't think you can add extra columns and keep the many-to-many rel. You'll have to switch to many-to-one rels.

See the discussion here:

Can add extra field(s) to @ManyToMany Hibernate extra table?