Contents

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Preface

1 EJB Overview

Invoking Enterprise JavaBeans

Implementing an EJB

Bean Implementation

Parameter Passing

Parameter Objects

Types of EJBs

Session Beans

Entity Beans

Message-Driven Beans

Difference Between Session and Entity Beans

2 An EJB Primer For OC4J

Develop EJBs

Create the Development Directory

Implement the Enterprise JavaBeans

Create the Deployment Descriptor

Archive the EJB Application

Prepare the EJB Application for Assembly

Modify Application.XML

Create the EAR File

Deploy the Enterprise Application to OC4J

Using ADMIN.JAR To Modify SERVER.XML

Updating SERVER.XML Manually

Verifying Deployment

3 CMP Entity Beans

Creating Entity Beans

Home Interface

Remote Interface

Entity Bean Class

Persistent Data

Primary Key

Deploying the Entity Bean

Advanced CMP Entity Beans

Advanced Finder Methods

Object-Relational Mapping of Persistent Fields

4 BMP Entity Beans

Creating BMP Entity Beans

Remote and Home Interface

BMP Entity Bean Implementation

The ejbCreate Implementation

The ejbFindByPrimaryKey Implementation

Other Finder Methods

The ejbStore Implementation

The ejbLoad Implementation

The ejbPassivate Implementation

The ejbActivate Implementation

The ejbRemove Implementation

Modify XML Deployment Descriptors

Create Database Table and Columns for Entity Data

5 Message-Driven Beans

Creating Message Driven Beans

Bean Class Implementation

Configuring XML Files

Deploying the Entity Bean

Client Accessing MDB

6 Advanced EJB Subjects

Accessing EJBs

EJB Reference Information

Setting JNDI Properties

Using the Initial Context Factory Classes

Accessing an EJB in a Remote Server

Reusing or Dedicating Connections

Location of Commonly-Used Classes Through Parent

Changing XML Files After Deployment

Entity Bean Concurrency and Database Isolation Modes

Database Isolation Modes

Entity Bean Concurrency Modes

Exclusive Write Access to the Database

Effects of the Combination of Isolation and Concurrency Modes

Affects of Concurrency Modes on Clustering

Configuring Pool Sizes For Entity Beans

Techniques for Updating Persistence

Configuring Environment References

Configuring Security

Users, Groups, and Roles

Default Role Mapping

Authenticating EJB Clients

Common Errors

NamingException Thrown

Deadlock Conditions

7 EJB Clustering

EJB Clustering Overview

Stateless Session Bean Clustering

Stateful Session Bean Clustering

Entity Bean Clustering

Combination of HTTP and EJB Clustering

Enabling Clustering For EJBs

Configure Nodes With Multicast Address and Identifier

EJB Replication Configuration

Deploy EJB Application To All Nodes

Application Client Retrieval Of Clustered Nodes

Load Balancing Options

8 Active Components For Java

Future Needs of Business Applications

Current Programming Models

Remote Procedure Call Model

Database Transactional Queuing Model

AC4J Framework

AC4J Architecture

Introduction to AC4J Components

Active EJBs

Interactions

Processes

Reactions

Data Tokens

Databus

Set Up Oracle Database For AC4J Support

AC4J Databus XML Configuration

AC4J Example

Asynchronous Request to An Active EJB

Active EJB processes the Client's Request

Asynchronous Response to the Requesting Active EJB

Asynchronous Response to the Client

Receive Response by the Client

AC4J Active EJB Deployment

A OC4J-Specific DTD Reference

OC4J-Specific Deployment Descriptor for EJBs

Enterprise Beans Section

Assembly Descriptor Section

DTD Listing

Element Description

B Third Party Licenses

Apache HTTP Server

The Apache Software License

Apache JServ

Apache JServ Public License

Index