In the following example, how can I save the value of role to the role with id=1 without loading it?

I have tried:

Map user = new HashMap<String,Object>();

user.put("address","Address test");
user.put("role",1);

session.save("User",user);

But that results in:

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.util.Map
at org.hibernate.property.MapAccessor$MapGetter.get(MapAccessor.java:90)

And

Map user = new HashMap<String,Object>();

user.put("address","Address test");
user.put("role.id",1);

session.save("User",user);

Doesn't save the role, console shows this SQL:
Hibernate: insert into user (ts, address) values (?, ?)

Any help will be greatly appreciated.