First steps and detailed concepts Java Persistence api



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JPA Mini Book

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

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