Enterprise Java Beans

The Path to Scalable, Robust Web Applications

In the headlong rush to bring applications to the web, developers are finding that the tools and techniques of desktop application development are no longer up to the task. The development of a web application is fraught with difficulties: complex interactions between multiple pieces of software (web server, cgi programs, databases, load balancers, etc), insufficient debugging tools, and a challenging testing environment. These difficulties increase risk and cause schedules to slip.

Enterprise Java Beans (EJB) offers a vastly improved environment in which to build web applications. It is component-oriented and so can help achieve re-usable software. Its focus on business logic helps separate presentation from application. This makes automated testing relatively easy and allows the application to be quickly re-targeted for different user interfaces and different devices. Its automatic handling of transactions, storage, and security reduce the workload on developers and help to achieve more robust applications.

Slide-01.html Web Applications Using Enterprise Java Beans
Slide-02.html The Auction System
Slide-03.html The Demo

Slide-04.html System Design
Slide-05.html System Decomposition
Slide-06.html Introducing Enterprise Java Beans
Slide-07.html Defining the System

Slide-08.html Domain Objects - The User
Slide-b01.html Example 1 - User Interface
Slide-09.html Domain Object - The User (cont)
Slide-b02.html Example 2 - UserException Class
Slide-10.html Domain Objects - The Item
Slide-b03.html Example 3 - Item Interface
Slide-11.html Domain Objects - The Bid
Slide-b04.html Example 4 - Bid Interface
Slide-12.html Getting a Domain Object
Slide-13.html Home Interface - User
Slide-b05.html Example 5 - User Home Interface
Slide-14.html Home Interface - User (cont)
Slide-15.html Primary Key - User
Slide-b06.html Exampel 6 - User Primary Key Class
Slide-16.html Home Interface - Item
Slide-b07.html Example 7 - Item Home Interface
Slide-17.html Home Interface - Bid
Slide-b08.html Example 8 - Bid Home Interface

Slide-18.html Home Interfaces - Bootstrapping
Slide-19.html The Java Naming and Directory Interface
Slide-20.html DIAGRAM: Basic EJB Architecture
Slide-21.html Deploying An Enterprise Java Bean
Slide-22.html Configuring the Client
Slide-b09.html Example 9 - JNDI Property Specification
Slide-23.html A Look at the Client
Slide-b10.html Example 10 - Client Side Code
Slide-24.html DIAGRAM: System Architecture With Client

Slide-25.html Implementing Enterprise Java Beans
Slide-26.html Session vs. Entity Beans
Slide-27.html Rules of Thumb
Slide-28.html Entity Beans in the Auction System
Slide-29.html Entity Bean Implementation
Slide-30.html Business Methods
Slide-b11.html Example 11 - Bid Business Methods
Slide-31.html Loading State from the DB
Slide-b12.html Example 12 - Loading Bid from DB
Slide-32.html Loading State from the DB (cont)
Slide-33.html Storing State in the DB
Slide-b13.html Example 13 - Storing Bid to DB
Slide-34.html Bean Creation
Slide-b14.html Example 14 - Bid Creation
Slide-35.html Bean Destruction
Slide-b15.html Example 15 - Destroying a Bid
Slide-36.html Finding Bids
Slide-b16.html Example 16 - Bid Primary Key Finder
Slide-37.html Finding Bids (cont)
Slide-b17.html Example 17 - Bid Finder (by item)
Slide-38.html Declarative Implementation Elements
Slide-39.html The Importance of Being Transactional
Slide-40.html Transactions for Entity Beans
Slide-b18.html Example 18 - Auction System Deployment Descriptor
Slide-41.html Other Transactional Attributes
Slide-42.html Security for Entity Beans
Slide-b19.html Example 19 - Security Descriptor for Bid
Slide-43.html Security Administration
Slide-44.html Other Elements of the Deployment Descriptor
Slide-b20.html Example 20 - Bid Deployment Descriptor
Slide-45.html A Complete Application
Slide-46.html Display A User's Items
Slide-b21.html Example 21 - Item List JSP
Slide-47.html Display A User's Items (cont)
Slide-48.html JSP Beans
Slide-b22.html Example 22 - JSP Bean Code
Slide-49.html Advantages of JSP
Slide-50.html DIAGRAM: Application
Slide-51.html Review: The Application

Slide-52.html Roles in the EJB Universe
Slide-53.html The EJB Container
Slide-54.html Container <--> Interfaces
Slide-55.html Entity Bean Lifecycle
Slide-b23.html Entity Bean Lifecycle
Slide-56.html Entity Bean Lifecycle (cont)
Slide-57.html Entity Bean Lifecycle (cont)
Slide-58.html Implementation of Declarative Properties
Slide-59.html Point of Interception
Slide-60.html DIAGRAM: Point of Interception
Slide-61.html Container Efficiency & Scalability
Slide-62.html Thread Pooling
Slide-63.html Thread Pooling (cont)
Slide-64.html Instance Pooling
Slide-65.html Other Container Value-Adds

Slide-66.html Alternatives
Slide-67.html COM+
Slide-68.html Proprietary Application Servers
Slide-69.html Roll-Your-Own
Slide-70.html SOAP
Slide-71.html Wrap-up