EJB & JSP

The first section discusses J2EE in more depth, with special emphasis on how and where JSP and EJB fit in. The second section covers JavaServer Pages including numerous JSP examples. The book provides the JSP's for the main application developed and dissected, a hotel booking application. The final part covers Enterprise JavaBeans. The bulk of this section is creating and analyzing EJBs to work with the JSPs developed earlier in the book. By the end of the book, the hotel booking application is complete.

This Unlimited Edition stays up to date long after other publications. A companion Web site includes all the code and examples from the book, and is updated to include new chapters, programs, and other related material.

Table of Contents

Preface

Part IJ2EE Overview

Chapter 1 Enterprise Computing Concepts

The Enterprise Computing Environment

Developing Applications in Layers

Two-Tier Architectures in Brief

N-tier Architectures in Brief

Objects and Components

Server Component Architecture

What About Web Applications?

JSP and EJB with the J2EE Specification

Summary

Chapter 2 J2EE Component APIs

J2EE API Classifications

J2EE APIs

JavaServer Pages

Java Servlets

Enterprise JavaBeans

Java Messaging Services

Java Transaction API

Java Transaction Services

JavaMail

Java Naming and Directory Interface

Java Database Connectivity

Remote Method Invocation and IIOP

Java Interface Definition Language

J2EE Connector

Summary

Part II JavaServer Pages

Chapter 3 A First Look at JavaServer Pages

JavaServer Pages

Creating and Using JSP Pages

The Relationship Between JSP Pages and Java Servlets

A Typical JSP Execution

Examining Some JSP Pages

A Simple JSP Page: Your Name Here and ereH emaN ruoY

JSP Versus the Competition

Separating Logic from Presentation

The Strength of Java

JSP Versus Java Servlets

JSP Versus Active Server Pages

JSPs Versus Client-Side Scripting

Disadvantages of Using JSP

Summary

Chapter 4 The Elements of a JSP Page

Coding Static Page Content in JSP Pages

Programmable JSP Elements

JSP Directives

JSP Scripting Elements

Coding JSP Standard Actions

The param and params Action

The forward Action

The getProperty and setProperty Actions

The include Action

The plugin and fallback Actions

The useBean Action

JSP Implicit Objects

Summary

Chapter 5 JSP Web Sessions

Understanding Sessions

The Session Life Cycle

Should All Your JSPs Participate in Sessions?

Sharing Data with Sessions

Tending to Changes in the Session Object

Summary of Session Methods

Summary

Chapter 6 JSP and JavaBeans

A JavaBeans Primer

JavaBeans Defined

Coding JavaBeans

Creating a Simple Bean

Communicating with Other Beans

Using Beans in a JSP Page

Variations on a Theme

Collecting Values of Bean Properties from Web Pages

Displaying and Using Values of Bean Properties in JSP Pages

Using JavaBeans in Multiple JSPs

Trying with page Scope

Trying with application Scope

Other scope Attribute Values

Bean Usage Odds and Ends

Summary

Chapter 7 JSP Tag Extensions

Tag Extensions

Using Tags Versus Using JavaBeans

Tag Library Classes, Interfaces, and Components

Using the taglib Directive

Examining the Tag Interface

Creating a Tag Library Descriptor File

Implementing a Custom Tag

Implementing the Empty Tag Without Attributes

Implementing the Empty Tag with Attributes

Implementing the Tag with a Body

Optionally Processing the Tag Body

Selectively Processing the Tag Body

Repetitively Processing the Tag Body

Writing an Example Nested Tag

The case Statement Tag

The when Statement Tag

The otherwise Statement Tag

Summary

Chapter 8 JSPs and Servlets Revisited

Examining the Servlet Life Cycle

Writing the Minimal Servlet

Writing a Minimal JSP-Generated Servlet

Examining the init and jspInit Methods

Examining the destroy and jspDestroy Methods

Examining the service and _jspService Methods

Using the JSP/Servlet Environment

Useful Servlet Environment Features

Using JSPs with Servlets

Forwarding Requests from Servlets

Summary

Chapter 9 JSP Errors and Debugging

Examining a JSP Error

Tracking JSP Errors

The errorPage Page Directive Attribute

The isErrorPage Page Directive Attribute

The exception Implicit Variable

JSP Translation Errors

JSP Runtime Errors

JSP Exception Classes

JSP Debugging Techniques

Remembering Good Coding Practices

Debugging Concurrency Issues

Summary

Chapter 10 The "Make Money" Brokerage Application

The "Make Money" Application

Implemented Application Features

The Application Data Defined

The Client Scenario

Logging on to the "Make Money" Application

Checking the Account ID/Password Combination

Creating the "Make Money" JavaBeans

Examining the showcustoptions.jsp Page

Examining viewhistory.jsp

Examining the AccountHistory Class

Revisiting viewhistory.jsp

Summary

Part IIIEnterprise JavaBeans

Chapter 11 A First Look at EJB

Understanding EJBs

Goals of the EJB Architecture

Examining EJB Release 1.1

Examining the EJB and Its Environment

Essential Enterprise Bean Properties

Examining EJB Roles

Summary

Chapter 12 The Elements of an EJB

Using the Enterprise Bean

EJB Components: The Short Story

Examining the EJB Interfaces

Understanding the Home Interface

Understanding the Remote Interface

The EJB Object

About the Home and EJB Object

The Bean Class

Using Entity Beans

Using Session Beans

Comparing Entity Beans and Session Beans

Using Session and Entity Beans

The Primary Key Class

New with EJB 2.0: Message-Driven Beans

EJB Deployment Descriptors

Summary

Chapter 13 EJB Contexts and Containers

Exploring the EJB Context

Gaining Access to a Context Object

Using EJBContext Methods

Understanding the EJB Container

The Container's Responsibility

The Required EJB Container Runtime Environment

Summary

Chapter 14 EJB Session Beans

Understanding Session Beans

Session Bean Life Cycle

One Client, One Thread, One Session Bean, One Time

Using Stateless Session Beans

Characteristics of Stateless Session Beans

Life Cycle of Stateless Session Beans

Using Stateful Session Beans

Characteristics of Stateful Session Beans

Life Cycle of Stateful Session Beans

Using the javax.ejb.SessionBean Interface

ejbActivate

ejbPassivate

ejbRemove

setSessionContext

ejbCreate

The javax.ejb.SessionContext Interface

getEJBObject

Creating a Stateless Session Bean

Coding the Remote Interface

Coding the home Interface

Coding the Bean Class

Coding the Deployment Descriptor

Code for a Sample Client

Using JNDI

Creating a Stateful Session Bean

Coding the remote Interface

Coding the home Interface

Coding the Bean Class

Coding the Deployment Descriptor

Code for a Sample Client

Summary

Chapter 15 EJB Entity Beans

Examining Entity Bean Characteristics

Using Entity Beans for Persistent Data

Accessing Entity Beans with a Primary Key

Looking at the Entity Bean Life Cycle

Examining Entity Bean Client Scenarios

Data Persistence

Container-Managed Persistence Entity Beans

Bean-Managed Persistence Entity Beans

Using ejbRemove

Using setEntityContext

Using unsetEntityContext

Using ejbPassivate and ejbActivate

Using ejbStore and ejbLoad

Other Methods You Would Typically Implement When Coding Entity Beans

Coding Entity Bean Creation Methods

Coding create Methods

Coding ejbCreate Methods for BMP Beans

Coding ejbPostCreate Methods for BMP Beans

Coding ejbCreate and ejbPostCreate Methods for CMP Beans

Coding finder Methods in the home Interface and ejbFind Methods in the Bean Class

The Primary Key Class

Looking at the Life Cycle of an Entity Bean

Examining the Possible Entity Bean States

Instantiating an Entity Bean

Moving an Entity Bean to the Pool

Transitioning to the Ready State

Returning to the Pooled State

Killing an Entity Bean

Implementing an Entity Bean

Creating the remote Interface

Creating the Primary Key Class

Implementing the Bean Class as a BMP Bean

Implementing the Bean Class as a CMP Bean

Writing the Deployment Descriptor for a CMP bean

Summary

Chapter 16 EJB Security

System Security Overview

Reviewing Java Language Security Features

Using the JVM Security Features

Looking at the Java Security Packages

Security Features Available in the java.lang Package

Securing EJB Applications

Identifying and Authorizing Clients

Managing Access to Resources in EJBs

EJB Players and Security

The Enterprise Bean Provider

The Application Assembler

The Deployer

The EJB Container Provider and Server Provider

The System Administrator

Securing the Rest of Your Environment

Summary

Chapter 17 EJB and Transaction Management

Transaction Properties

Understanding Transaction Terminology

Learning the ACID Properties

Differentiating Transaction States

Learning Some Transaction Concepts

Supporting Transactions in EJBs

Managing EJB Transactions

Isolating Transactions at Different Levels

Isolation Conditions

Summary

Chapter 18 Creating EJB Clients

Examining the Rules of EJB Clients

The Client Never Talks to the Bean or to the Container

The Client Acquires References to EJB Objects Through a home Object

The Client Does Not Know Where the Bean Lives

The Client Does Not Know How the Bean Is Implemented

The Client Accesses Session Beans Much as It Does Entity Beans

The Client May Be One of Several Java Objects

Coding an EJB Client

Obtaining a Reference to the EJB Object

Creating an EJB Object

Summary

Chapter 19 The Proposed EJB 2.0 Specification

EJB 1.1 Versus EJB 2.0: The Major Changes

The MessageDrivenBean Type

The New Container-Managed Persistence Model

Using the EJB Query Language

Additional Methods in home Interfaces

Summary

Chapter 20 Integrating JSPs and EJBs

The "Make Money" Brokerage Application Revisited

Using JSP Pages as EJB Clients

Coding the JSP Page That Implements an EJB Client

The Tag Library Code

The Enterprise Bean

Summary
Appendix AThe JSP API

The JSP API

The Class and Interface Hierarchies for the javax.servlet.jsp Package

The Class and Inheritance Hierarchies for the javax.servlet.jsp.tagext Package

The javax.servlet.jsp Package

The javax.servlet.jsp.tagext Package

Interfaces and Classes Added to JSP Release 1.2
Appendix B The EJB API

The EJB API

Class and Inheritance Hierarchies for Package javax.ejb

Interface Hierarchy

The javax.ejb.spi Package and Its Interface

The javax.ejb Package
Appendix C Configuring the Tomcat Web Server

The Tomcat Web Server

Downloading Tomcat Release 3.2

Installing Tomcat

Setting Your Tomcat Environment Variables

Testing Your Tomcat Installation

Displaying Web Pages in Tomcat

Tomcat Directories and JSP Processing

More Information on Tomcat

Summary
Appendix D XML Overview

XML Features

A Simple XML Document

XML Document Components

Rules for Well-Formed XML Documents

Document Type Definitions

A Simple DTD

Element DTD Declarations

DTD Entities

Related XML Technologies

Summary