How To Define A Composite Primary Key Via @Embeddable
Description: This application is a proof of concept of how to define a composite key via @Embeddable and @EmbeddedId. This application uses two entities, Author and Book involved in a lazy bidirectional @OneToMany relationship. The identifier of Author is composed by name and age via AuthorId class. The identifier of Book is just a typical auto-generated numeric value.
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
