Introduction to the Java Persistence API 2

158 Ratings

Course Number: JAV-162

Duration: 3 days (19.5 hours)

Format: Live, hands-on

JPA 2 Training Overview

Accelebrate's JPA 2 Training: Introduction to the Java™ Persistence API 2 class teaches attendees how to implement JPA for data persistence. JPA 2 is a standard feature of Java EE 6 and later, but can also be used with Java SE applications.

Location and Pricing

Accelebrate offers instructor-led enterprise training for groups of 3 or more online or at your site. Most Accelebrate classes can be flexibly scheduled for your group, including delivery in half-day segments across a week or set of weeks. To receive a customized proposal and price quote for private corporate training on-site or online, please contact us.

In addition, some Java courses are available as live, online classes for individuals.

Objectives

  • Understand the JPA architecture
  • Create JPA based applications
  • Understand and use JPA to map persistent objects to the database
  • Create JPA persistence units, and understand JPA persistence contexts
  • Use the JPA EntityManager
  • Work with queries and JPQL (Java Persistence Query Language), as well as the Criteria API (JPA 2)
  • Understand and work with collections and associations
    • Value and Entity Types
    • Bidrectional and unidirectional
    • 1-1, 1-N, N-N
  • Use versioning support for optimistic locking
  • Map inheritance hierarchies using JPA
  • Performance tune your JPA applications
  • Understanding JPA transaction support
  • Understand the relationship between JPA / EJB3
  • Use JPA entities from session beans
  • Be familiar with Spring support for JPA

Prerequisites

All attendees must have substantial prior Java development and relational database experience.

Outline

Expand All | Collapse All

Introduction to Java Persistence API (JPA)
  • Overview
    • Persistence Layers, Object-Relational Mapping (ORM), JDBC
    • JPA Overview
  • Mapping with JPA
    • Entities and @Entity, ids and @Id
    • Generated Id Values
    • Basic Mapping Types
  • Persistence Unit and EntityManager
    • Persisting to the DB, the EntityManager API
    • Persistence Units, Config, Persistence Context
    • Retrieving Persistent Entities with find()
  • More About Mappings
    • Default Mappings, @Basic, @Column
    • Field vs. Property Access
    • Temporal (Date/Time) Mappings
  • Logging Options (Provider based)
Updates and Queries
  • Inserting and Updating - Persisting new Entities, Updating an Instance, Removing an Instance
  • Querying and JPQL
    • Entity Based Queries, SELECT, WHERE
    • Query Interface, Executing Queries, Generic Queries (JPA 2)
    • JPQL Operators, Expressions, and Parameters
    • Named Queries
  • Additional Query Capabilities
    • Projection query, Ordering, Aggregate Query, Build Update and Delete
  • Embedded Objects
    • @Embeddable, @Embedded
    • Defining and using Embedded Objects
  • Compound Primary Keys - @EmbeddedID, @IDClass, Defining Compound Keys
The Persistence Lifecycle
  • Transaction Overview and Transactions in JPA
    • Transaction Overview
    • EntityTransaction API (including JTA and resource-local EntityManager)
  • The Persistence Lifecycle
    • JPA Entity States (New, Managed, Detached, Removed), and Entity State Diagram
    • Persistence Context - Lifespan, Propagation
    • Synchronization to the DB
  • Versioning and Optimistic Locking
    • Overview, Detached Instances
    • Versioning, @Version, Optimistic Locking
  • Lifecycle Callbacks
    • @PrePersist, @PostPersist, etc.
    • Entity Listeners, @Entity Listeners
Entity Relationships
  • Relationships Overview: Object Relationships, Participants, Roles, Directionality, Cardinality
  • Relationship Mapping
    • Mapping Overview (1-1, 1-N, N-1, N-N)
    • Unidirectional and Bidirectional
    • @ManyToOne, @OneToMany, Table Structures
    • Relationship Inverse - Owning Side
    • Collection Types (List, Set, etc)
    • Cascading Over Relationships (including orphanRemoval - JPA 2)
    • @ManyToMany, @OneToOne
    • Lazy and Eager Loading
    • Queries Across Relationships (Inner Joins, Outer Joins, Fetch Joins)
  • Entity Inheritance Mapping
    • Overview
    • Single Table Mapping
    • Joined (Table per Subclass) Mapping
    • Table per Concrete Class Mapping
    • Pros and Cons
Element Collections (JPA 2)
  • Overview, Collections of Value Objects, @ElementCollection, @CollectionTable
  • Using Element Collections
  • Collections of Embeddables
Criteria API (JPA 2)
  • Overview of the Criteria API
  • Path Expressions, Building Queries (CriteriaBuilder, CriteriaQuery, Subquery, Predicate, Expression, Order, Selection, Join)
  • Executing Queries and Accessing Results
Additional JPA Capabilities
  • XML Mapping Files
  • Bean Validation (JPA 2)
  • Best Practices
    • Primary Keys, Named Queries, Lazy/Eager Loading, Transactional Semantics, Encapsulation, Report Queries
Integration
  • Data Access Objects (DAO) and Java SE Integration
    • DAO Overview
    • JpaUtil Class for EntityManager management in Java SE
    • Lifecycle Considerations
  • Integration with EJB
    • Using JPA with Session Beans
    • Container Managed (Injected) Entity Manger
    • JTA Transactions and Lifecycle Considerations
    • Extended Persistence Contexts
  • Using JPA with Java Web Apps
    • Using EntityManager in Web apps - request scoping
    • Lazy Loading - Open EntityManager in View Pattern
  • Integration with Spring
    • Injection of EntityManger, EntityManagerFactory
    • LocalEntityManager FactoryBean
    • JPA/Spring Based DAO
Conclusion

Training Materials:

All JPA training students receive comprehensive courseware.

Software Requirements:

  • A recent version of Windows, macOS, or Linux with at least 8 GB RAM
  • JDK 8 or later
  • The Java tool the students are likely to use after the class (Eclipse or IntelliJ IDEA are recommended)
  • Other free software - please contact us if you have purchased this class


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