1Z0-898: Java EE - Develop Database Applications with JPA

Introduction to Java Persistence API

• Describing the Java Persistence API
• Creating entity classes
• Using persistent field and properties
• Using a generated primary key (table, sequence and identity)
• Obtaining an Entity Manager
• Creating a Persistence Unit
• Using an entity manager to create, find, update, and delete entities
• Creating typed queries in JPA

Working with JPA in a Java Enterprise Environment

• Evaluating the role of the container with JPA
• Accessing JPA entities from a servlet
• Evaluating the application of JSF as a user interface framework
• Accessing JPA entities from Enterprise JavaBeans
• Determining the impact of using stateless, stateful, and singleton session beans on entities
• Configuring a persistence context in an EE context

Introduction to the Auction Application Case Sudy

• Describing the auction application
• Defining the domain objects of the auction application
• Describing the implementation model for the auction system

Modeling Relational Databases with JPA Entities

• Examining relationships in the data and object models
• Using relationship properties to define associations
• Implementing one-to-one unidirectional and bidirectional associations
• Implementing many-to-one/one-to-many bidirectional associations
• Implmenting many-to-many unidirectional and bidirectional associations
• Using OrderBy and OrderColumn annotations to define sort order
• Applying the OrphanRemoval annotation to prevent orphaned entities

Working with the Entity Manager

• Describing the relationship between an entity and an entity manager, and between a persistence context and a persistence unit
• Differentiating between transaction-scoped and extended entity managers
• Describing the entity life cycle
• Using entity manager operations to perform CRUD operations: persist, find, merge, remove
• Examining the role of the entity manager with detached entities
• Defining and use cascading operations

Persisting Enums and Collections

• Persisting entities that contain enums
• Persisting entities that contain collections
• Persisting entities that contain Maps

Creating Queries with the Java Persistence Query Language (JPQL)

• Describing the Java Persistence Query Language (JPQL)
• Contrasting JPQL with native queries
• Using conditionals to filter results
• Refining queries to return only needed data
• Performing joins between entities
• Creating dynamic queries with parameters
• Performing bulk updates and deletes

Using the Critieria API

• Contrasting the Critiera API with JPQL
• Using the Critieria API structure and core interfaces
• Creating SELECT, FROM, and WHERE clauses
• Creating paths and expressions
• Using ORDER BY, GROUP BY, and HAVING clauses
• Using the canonical metamodel

Implementing Bean Validation with JPA

• Describing the JPA lifecycle phases where validation takes place
• Creating an entity listener class
• Utilizing validation groups
• Using built-in validation constraint annotations provided by Bean Validation
• Creating a custom Bean Validation constraint

Applying Locking and Transactions

• Describing transaction semantics
• Comparing programmatic and declarative transaction scoping
• Using JTA to scope transactions programmatically
• Implementing a container-managed transaction policy
• Supporting optimistic locking with the versioning of entity components
• Supporting pessimistic locking by using EntityManager APIs
• Describing the effect of exceptions on transaction state

Advanced Modeling: Entity Inheritance Relationships

• Evaluating object-relational mapping strategies for entity inheritance
• Applying single-table-per-class, joined-subclass, and table-per-class inheritance mapping strategies
• Using embeddable classes
• Overriding mappings with the @AttributeOverride and @AssociationOverride annotations
• Specifying composite primary keys

Optimizing JPA Performance

• Using lazy fetching to prevent the loading of entities that are not being used
• Using pagination to control the amount data that is needed at any one time
• Modifying queries to prevent the N + 1 problem
• Creating read-only queries
• Describing performance issues associated with IDENTITY ID generation
• Creating and using stored procedures with JPA and EclipseLink
• Using cache optimizations with JPA and EclipseLink