JPA Training: The Java Persistence API

Goals

• Understand the value of object/relational mapping and JPA’s role as a standard for ORM implementations.
• Develop JPA entities using JPA annotations to align the Java classes, properties, and types to relational tables, columns, and types.
• Create entity managers and instantiate persistence contexts to perform persistence operations.
• Carry out create/retrieve/update/delete (CRUD) operations on JPA entities using entity managers.
• Implement entity relationships of all cardinalities, including unidirectional and bidirectional relationships.
• Implement special ORM cases such as composite primary keys, inheritance relationships, and cascading operations.
• Use JPQL to write object-oriented queries, and process query results.
• Use the Criteria API to define queries programmatically, and take advantage of type safety using the Metamodel API.
• Build reusable façades that encapsulate simpler and more complex persistence operations.
• Implement persistence lifecycle event handlers.
• Define JSR-303 validation constraints on JPA entities and see them enforced by the JPA provider.
• Make well-informed decisions about locking strategies, and understand the role of the JPA cache in enterprise applications.

Outline

1. Introduction to JPA
   1. Object/Relational Mapping
   2. Mismatches Between Relational and Object Models
   3. The Java Persistence API
   4. JPA History
   5. JPA Architecture
   6. Entity Metadata
   7. The Entity Manager
   8. JPA Providers
2. Object/Relational Mapping
   1. Annotations
   2. JavaBean Standards
   3. Property, Field, and Mixed Access
   4. Table and Column Mapping
   5. Primary Keys and Generation
   6. Type Mappings
   7. Temporal and Enumerated Types
   8. Embedded Types
   9. Entity Relationships
   10. @ManyToOne Relationships
   11. @OneToOne Relationships
   12. @OneToMany Relationships
   13. @ManyToMany Relationships
   14. Eager and Lazy Loading
3. Entity Managers
   1. Putting Entities to Work
   2. persistence.xml
   3. Entity State and Transitions
   4. Managing Transactions
   5. Persistence Operations
   6. Creating Queries
   7. Named Queries
   8. Query Parameters
   9. Native Queries
4. JPQL
   1. The Java Persistence Query Language
   2. Query Structure
   3. Path Expressions
   4. Filtering
   5. Scalar Functions
   6. Operators and Precedence
   7. between, like, in
   8. is null, is empty
   9. Ordering
   10. Aliases
   11. Grouping
   12. Aggregate Functions
   13. Joins
   14. Constructors
5. Advanced Mappings
   1. Inheritance Strategies
   2. Single-Table Strategy
   3. Joined-Table Strategy
   4. Table-Per-Concrete-Class Strategy
   5. Querying Over Inheritance Relationships
   6. Secondary Tables
   7. Composite Primary Keys
   8. @IdClass and @EmbeddedId
   9. Derived Identifiers
   10. @ElementCollection
   11. Default Values
   12. @Version Fields
   13. Cascading and Orphan Removal
   14. Detachment and Merging
6. The Criteria API
   1. History of the Criteria API
   2. Criteria Query Structure
   3. The MetaModel API and Query Type Safety
   4. Tuples
   5. Joins
   6. Predicates
   7. Building Expressions
   8. Ordering
   9. Grouping
   10. Encapsulating Persistence Logic
   11. Fa�ades
   12. Range Queries
7. Lifecycle and Validation
   1. Lifecycle Events
   2. Method Annotations
   3. Entity Listeners
   4. JSR-303 Validation
   5. Constraint Annotations
   6. Validation Modes
   7. Validation Groups
8. Locking and Caching
   1. Concurrency
   2. Optimistic Locking
   3. Optimistic Read Locking
   4. Optimistic Write Locking
   5. Pessimistic Locking
   6. Caching
   7. Persistence Context as Transactional Cache
   8. Shared (2nd-level) Cache
   9. Locking and Caching “Do’s and Don’ts”

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