Java Training Overview
The Enterprise JavaBeans 3.0 specification is a deep overhaul of the EJB specification that is intended to improve the EJB architecture by reducing its complexity from the developer's point of view. It leverages annotations (introduced in Java 5) and Object-Relational Mapping (ORM) technologies to eliminate the dependence on complex EJB APIs, allow POJO (Plain Old Java Object) based development, and provide an effective technology for creating distributed, transactional components, and for mapping relational data to an object schema. This course provides thorough coverage of the EJB3 technology - presented in a clear and effective manner. It starts with the basic concepts and APIs of EJB and then continues on with complex topics such as message driven beans and transactions. New concepts such as the use of annotations and the use of Dependency Injection to initialize references are covered in depth. The course also includes thorough coverage of managing persistence using the Java Persistence API (JPA). The course uses hands-on labs and a well-paced approach to make this complex technology understandable in an accelerated fashion. You will come away with a comprehensive understanding of EJB and the important issues that need to be considered to use it in real world applications. This course can be customized to your requirements.
Java Training Audience
Java developers who want to use EJB3.
Java Training Prerequisites
One year of Java programming experience (or equivalent) is preferred. Knowledge of relational databases and JDBC is strongly recommended.
Java Training Course duration
4 Days
Java Training Course outline
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 Faηade 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
Field 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 Key with Embedded Id Class
Using an Embedded Id Class
Compound Key with ID Class
Additional Java Persistence Capabilities
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
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 Persistance 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
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