What are simple rules that a Primary key class has to follow?

Every entity bean has a primary key that represents a unique identity. This primary key must be represented by a primary key class, which the bean developer defines or specifies. This class contains theinformation necessary to find that entity in the persistent store. It is used internally by the EJB container, and also by the client to find a particular instance of the entity. This class follow some certain rules…..
Category:EJB Interview Questions