How To Define A Relationship in an @Embeddable Composite Primary Key

Description: This application is a proof of concept of how to define a relationship in an @Embeddable composite key. The composite key is AuthorId and it belongs to the Author class.

Key points:

• the composite key class (e.g., AuthorId) is public
• the composite key class must implement Serializable
• the composite key must define equals() and hashCode()
• the composite key must define a no-arguments constructor