FastTrack to Enterprise JavaBeans 3.0 and the JPA Course

Topics covered on the 5 day FastTrack to Enterprise JavaBeans 3.0 and the JPA course

Overview

• What is EJB?
• EJB Goals
• Types of Enterprise JavaBeans
• Java Persistence API
• EJB and Java EE (Enterprise Editions)
• EJB in Java EE Architecture
• SOA and EJB
• SOA with Web Services and EJB

EJB 3.0

• EJB 3.0 Overview
• EJB 2.X Problems
• EJB 3.0 Goals
• Session Bean Usage
• Persistent Entity Usage
• MDB Usage

Session Bean Overview

• What are Session Beans?
• Stateless Session Beans (SLSB)
• Stateful Session Beans (SFSB)
• Session Bean can be Distributed
• Defining a Session Bean
• Stateless Session Bean Definition
• Calculator Remote Business Interface
• Remote and Local Business Interfaces
• Calculator Bean Local Business Interface
• A Brief Note on Annotations
• How Annotations Work
• Annotation Definition
• Using Annotations
• What Else is Needed?

Packaging and Deployment

• J2EE Packaging
• EJB-JAR File
• Deployment Descriptor (DD)
• Deployment Descriptors in EJB 3
• EJB-JAR File Structure
• Enterprise Archive (EAR File)
• application.xml File
• Server Deployment
• EJB Container
• The EJB Container
• Server Deployment

JNDI Overview

• How do Remote Clients get EJB Access?
• JNDI – Java Naming and Directory Interface
• EJB Container Binds a Reference into JNDI
• Client Looks up Reference in JNDI
• JNDI Tree Structure
• JNDI API Overview
• JNDI API
• The Context Interface
• The InitialContext Class
• Specifying the InitialContext Properties
• Using JNDI

EJB Client

• Client View of a Session Bean
• Client Invocation of a Session EJB
• PortableRemoteObject and Casting
• Running a Client

Dependency Injection

• Dependency Injection
• The JavaTunes Online Music Store
• An EJB Referencing Another EJB
• CatalogMaintenance
• Injection of CatalogMaintenance
• What is Happening

Deployment Descriptors

• More About Deployment Descriptors
• The XML Deployment Descriptor

The EJB Environment

• Issues with Obtaining Resources
• Referencing Resources External to EAR
• Reference & Deployment Descriptor Usage
• Resolving a JNDI Name
• Simple Environment Entries
• Declaring Simple Environment Entries
• Setter Injection
• Resource Manager Connection Factories
• More on the Enterprise Bean Environment
• The Environment is a Level of Indirection
• Looking up Resources in the Environment
• Looking up via EJBContext
• Looking up via JNDI API
• More on the @Stateless Annotation
• More on the @EJB Annotation
• More on the @Resource Annotation
• Deployment Descriptor vs Annotation

Stateless Session Bean Lifecycle & Interceptors

• Stateless Session Bean State Diagram
• Lifecycle of SSB
• Client Call of a Stateless SB Method
• Interceptors
• Business Method Interceptors
• InvocationContext Interface Details
• Interceptor Method Details
• Interceptor Class
• Using Interceptor Classes
• Method Level Interceptors
• Lifecycle Callback Interceptors
• Lifecycle Interceptor in the Bean Class
• Lifecycle Interceptor in a Separate Class

Stateful Session Beans

• Stateful Session Bean (SFSB) Overview
• Coding a Stateful Session Bean
• Stateful Session Bean Clients
• Stateful Session Bean Removal
• Stateful Session Passivation/Activation
• When to Use Stateful Session Beans
• @PrePassivate and @PostActivate Callbacks
• Stateful Session Bean State Diagram

The Timer Service

• Bean Requirements
• The javax.ejb.Timer Interface
• The javax.ejb.TimerService Interface
• How the Timer Works
• Issues with Using the Timer Service

Overview of Messaging Systems

• What is Messaging?
• Loose Coupling
• When is Messaging Used?
• Two Messaging Models
• Publish/Subscribe – Illustrated
• More on Publish/Subscribe
• Point-to-Point – Illustrated
• More on Point-to-Point (P2P)
• Message Delivery – Push versus Pull

Overview of JMS API

• What is Java Message Service?
• API Structure
• JMS Interfaces
• Administered Objects
• Administered Objects and JNDI – Illustrated
• Client Workflow
• Synchronous Queue Consumer Client
• Asynchronous Queue Consumer Client
• JMS Message Types
• Message Header Fields

Message-Driven Beans

• J2EE Message Producers and Consumers
• Message-Driven Bean (MDB) Overview
• Goals of Message-Driven Beans
• MDB Consumption of a Message
• @MessageDriven Details
• Activation Configuration Properties
• Specifying a Destination for an MDB
• Specifying a Destination Using a DD

Message-Driven Bean Lifecycle

• Lifecycle Overview
• MDB State Diagram
• Interceptor Methods

Transaction Definition

• Transaction Overview
• Transaction Lifecycle
• Transactions Clarify Systems

Transactional System Overview

• Overview of a Transactional System
• Transactional System Components
• Transactional Object
• EJB Transaction Support

Transactions in EJB

• EJB Declarative Transaction Management
• Transactional Scope
• EJB Transaction Attributes
• Specifying Transaction Attributes
• NOTSUPPORTED
• SUPPORTS
• REQUIRED
• REQUIRESNEW
• MANDATORY
• NEVER
• Beans Have a Say in Transactions
• Beans can be Notified of Transaction Status
• Transaction Attributes – Some Choices
• Explicit/Bean-Managed Transactions
• Transaction Isolation Levels
• Multi-Process TX and Two Phase Commit

Security in EJB

• Security Requirements
• J2EE Security
• Roles
• J2EE Security Overview
• EJB Security Overview
• Authentication
• Programmatic Security
• Transport Level Security with SSL

Exception Handling

• Overview of Exceptions
• Exception Hierarchy
• Application Exceptions in EJB
• Defining Application Exceptions
• Container Handling of Application Exception
• Bean Throwing of Application Exception
• Client Handling of Application Exceptions
• System Exceptions Indicate Failure
• Container Handling of System Exception
• Client Handling of System Exceptions

EJB 3 Best Practices

• When to Use EJB
• Keep Business Interfaces Coarse Grained
• Session Façade Structure
• Use Container-Managed Transactions
• Transaction Duration
• Local and Remote Business Interface
• Tuning
• Session Bean Tuning
• Clustering
• Clustering Session Beans

JPA Overview

• The Issues with Persistence Layers
• Object-Relational Mapping (ORM) Issues
• Issues with JDBC Alone
• Java Persistence API Overview
• JPA Benefits
• Java Persistence Environments

Mapping a Simple Class

• Entity Classes
• Entity Class Requirements
• The Entity Declaration
• The Event Class
• The Id Property
• Filed Access or Property Access
• The EVENTS Table
• Generated Id Property
• Mapping Properties
• Basic Mapping Types
• Persisting to the Database

Entity Manager and Persistence Context

• The Entity Manager & Persistence Context
• The EntityManager
• The EntityManager Interface
• Persistence Unit
• Injecting an EntityManager
• Retrieving Persistent Objects
• Container-Managed Entity Manager
• The Persistence Unit
• persistence.xml

Inserting and Updating

• Transient, Persistent, Detached Instances
• Removed Instances
• Persisting a New Entity
• Synchronization to the Database
• Updating a Persistent Instance
• Detached Entities

Querying and Java Persistence Query Language (JPQL)

• Java Persistence Query Language
• JPQL Basics
• Executing a Query
• Where Clause
• Query Parameters
• Using Query Parameters
• Named Queries

Versioning/Optimistic Locking

• Optimistic Locking
• Using a Detached Instance
• Versioning
• Version Property in Java Class
• Locking Objects
• Lock Modes

Entity Relationships

• Relationships Overview
• Object Relationships
• Characteristics of Relationships
• Directionality
• Characteristics of Relationships

Mapping Relationships

• Mappings Overview
• Unidirectional Many-To-One Relationship
• The Table Structure – Many-To-One
• The Owning Side
• @JoinColumn
• Bidirectional One-To-One Relationship
• Using the Relationship
• More on the Inverse Side
• Bidirectional One-To-Many Relationship
• Mapping the One-To-Many Relationship
• Other Collection Types
• Many-To-Many Relationship
• Defining Many-To-Many Relationship
• Mapping Many-To-Many Relationships
• Specifying the Join Table
• Lazy and Eager Loading
• Cascading Operations
• The Cascade Element
• Queries Across Relationships
• OUTER and FETCH JOIN

Mapping Inheritance

• Entity Inheritance
• Details of Entity Inheritance
• Single-Table Strategy
• Entity Definitions for Single-Table
• Single Table: Pros and Cons
• Joined (Table per Subclass)
• Entity Definitions for Joined
• Joined: Pros and Cons
• Table per Concrete Class

Embedded Objects

• Using Embedded Objects
• Embeddable Class
• Reusing Embeddable Classes
• Overriding Embedded Class Attributes

Compound Primary Keys

• Compound Primary Keys
• Compound Key with Embedded Id Class
• Using an Embedded Id Class
• Compound Key with ID Class

More on Querying

• Projection Queries
• Aggregate Queries
• Bulk Update and Delete
• Native SQL Queries

Extended Persistence Contexts

• Stateful Session Beans with Entity State
• Extended Persistence context
• Issues with Extended Persistence Context

XML Mapping Files

• A Simple Entity Class
• JPA XML Mapping File
• JPA XML Mapping File – Mapping Entities
• JPA XML Mapping File – Named Queries

Java Persistence with Java SE

• Using JPA with Java SE
• Java SE APIs

Java Persistence Best Practices

• Primary Key Considerations
• Use Named Queries
• Use Lazy/Eager Loading Appropriately
• Be Aware of Transaction Semantics
• Encapsulate JPA Code
• Use Report Queries Where Applicable
• Optimize Read-Only/Mostly Data Access
• Paging Data
• Consider Going Outside of Java Persistence
• Know Your Provider Implementation