First steps and detailed concepts Java Persistence api

ABOUT THE AUTHOR
Hebert Coelho
is a senior Java Development, with 4 certifications and a published 
book about JSF (portuguese only). Founder of the blog uaiHebert.com visited from 
more than 170 different countries.
ABOUT THE EDITOR
Byron Kiourtzoglou
is a master software engineer working in the IT and Telecom domains. 
He is an applications developer in a wide variety of applications/services. He is currently 
acting as the team leader and technical architect for a proprietary service creation and 
integration platform for both the IT and Telecom industries in addition to a in-house big data 
real-time analytics solution. He is always fascinated by SOA, middleware services and 
mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.
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Document Outline

• Reasons that led to the creation of JPA
• What is JPA? What is a JPA Implementation?
• What is the persistence.xml file used for? And its configurations?
• Entity definitions. What are the Logic and Physical annotations?
• Id Generation: Definition, using Identity or Sequence
  • Identity
  • Sequence
• Id Generation: TableGenerator and Auto
  • TableGenerator
  • Auto
• Simple Composite Key
  • @IdClass
  • @Embeddable
• Complex Composite Key
• How to get an EntityManager
• Mapping two or more tables in one entity
• Mapping Hierarchy: MappedSuperclass
• Mapping Hierarchy: Single Table
• Mapping Hierarchy: Joined
• Mapping Hierarchy: Table per Concrete Class
• Pros/Cons of each hierarchy mapping approach
• Embedded Objects
• ElementCollection – how to map a list of values into a class
• OneToOne unidirectional and bidirectional
  • Unidirectional
  • Bidirectional
• There is no such “auto relationship”
• OneToMany/ManyToOne unidirectional and bidirectional
• There is no such “auto relationship”
• ManyToMany unidirectional and bidirectional
• There is no such “auto relationship”
• ManyToMany with extra fields
• How the Cascade functionality works? How should a developer use the OrphanRemoval? Handling the org.hibernate.TransientObjectException
  • OrphanRemoval
• How to delete an entity with relationships. Clarify which relationships are raising the exception
• Creating one EntityManagerFactory by application
• Understanding how the Lazy/Eager option works
• Handling the “cannot simultaneously fetch multiple bags” error