Q 1) How can we model a ternary relationship using Hibernate? For example, how can we model the ternary relationship presented here using Hibernate (or JPA)?

Ideally I prefer my model to be like this:

class SaleAssistant {
Long id;
//...
}

class Customer {
Long id;
//...
}

class Product {
Long id;
//...
}

class Sale {
SalesAssistant soldBy;
Customer buyer;
Product product;
//...
}

Q 1.1)

How can we model this variation, in which each Sale item might have many Products?

class SaleAssistant {
Long id;
//...
}

class Customer {
Long id;
//...
}

class Product {
Long id;
//...
}

class Sale {
SalesAssistant soldBy;
Customer buyer;
Set<Product> products;
//...
}

Q 2) In general, how can we model n-ary, n >= 3 relationships with Hibernate?

Thanks in advance.