I have User table & User Auth table. User table has user information & auth table just stores the last logged in date.

User configuration is defined in hbm file and we would like to use the facility provided by @Embeddable & @Embedded in xml configuration. Could someone explain how to do?

User table has
user id
first name
last name
password

User Auth table has
user id
last login date
login source

User Auth table does not have primary key so I cant use that as entity but I would like to use that as embedded object.

Without a primary key, how do you map a given record of User to the User Auth table?