JPA 2 Training: Introduction to the Java Persistence API 2

Course Number: JAV-162
Duration: 3 days
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JPA 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

Most Accelebrate courses are taught on-site at our clients' locations worldwide for groups of 3 or more attendees and are customized to their specific needs. Please visit our client list to see organizations for whom we have recently delivered training. These courses can also be delivered as live, private online classes for groups that are geographically dispersed or wish to save on the instructor's or students' travel expenses. To receive a customized proposal and price quote private training at your site or online, please contact us.

In addition, some courses are available as live, online classes for individuals. To see a schedule of online courses, please visit http://www.accelebrate.com/online_training/?action=category&page=j2ee.

JPA Training Prerequisites

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

Hands-on/Lecture Ratio

This class is 70% hands-on, 30% lecture, with the longest lecture segments lasting for 20 minutes.

JPA Training Materials

All JPA training students receive comprehensive courseware covering all topics in the course and a copy of APress's Pro JPA 2: Mastering the Java Persistence API.

Software Needed on Each Student PC

Please contact us for a comprehensive setup sheet for this course.

JPA Training 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

JPA Training Outline

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, @EntityListeners

Enitity 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
LocalEntityManagerFactoryBean
JPA/Spring Based DAO

Conclusion

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