Defining Entity Listener Class Via @EntityListeners

Description: This application is a sample of using the JPA @MappedSuperclass and @EntityListeners with JPA callbacks.

Key points:

• the base class ,Book, is not an entity, it can be abstract, and is annotated with @MappedSuperclass and @EntityListeners(BookListener.class)
• BookListener defines JPA callbacks (e.g., @PrePersist)
• subclasses of the base class are mapped in tables that contains columns for the inherited attributes and for their own attibutes
• when any entity that is a subclass of Book is persisted, loaded, updated, etc the corresponding JPA callbacks are called

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