Contents

Title and Copyright Information

Send Us Your Comments

Preface

Intended Audience

Documentation Accessibility

Organization

Related Documents

Conventions

1 Overview

Overview of J2EE

What is the J2EE Application Model?

What is the J2EE Platform?

What is an Application Server?

Overview of Oracle Application Server

J2EE Application Migration Challenges

J2EE Application Architecture

Migration Issues

Portability

Dependence on Vendor Specific Implementation

Deviations from J2EE Specification

Migration Approach

Using this Guide

2 Comparison of Oracle Application Server and WebSphere Features

Application Server Product Offerings Comparison

WebSphere Product Offerings

WebSphere Standard Edition

WebSphere Advanced Edition

WebSphere Enterprise Edition

Oracle Application Server

Architecture Comparison

IBM WebSphere Components

IBM HTTP Server

Web Server Plug-in

Administrative Server

Administrative Repository

Application Server

Oracle Application Server Components and Concepts

OracleAS Instance

Oracle HTTP Server

OC4J Instances

Oracle Process Manager and Notification Server (OPMN) Server

Distributed Configuration Manager (DCM)

Oracle Application Server Web Cache

Oracle Enterprise Manager Application Server Control

Oracle Application Server Infrastructure

High Availability and Load balancing

WebSphere Suppport for High Availability and Load Balancing

Clustering in WebSphere

Load Balancing in WebSphere

Oracle Application Server Support for High Availability and Load Balancing

Oracle Application Server Instance

Oracle Application Server Clusters (Middle Tier)

OC4J Islands

Stateful Session EJB High Availability Using EJB Clustering

Java Object Cache

Oracle Application Server Web Cache Clusters

OracleAS Infrastructure High Availability Solutions

J2EE Support Comparison

WebSphere J2EE support

Oracle Application Server J2EE support

Java Development and Deployment Tools

WebSphere Development and Deployment Tools

WebSphere Development Tools

WebSphere Studio

WebSphere Administrative Console

Oracle Application Server Development and Deployment Tools

Development Tools

Assembly Tools

Administration Tools

3 Migrating Servlets

Overview of the Java Servlet API

Servlet Lifecycle

The init() Method

The service() Method

The destroy() Method

Session Tracking

Cookies

URL rewriting

Hidden form fields in HTML

The HttpSession object

J2EE Web Applications

Web Application Archive (WAR)

About the WEB-INF directory

Differences between Servlet 2.0, 2.1 and 2.2

Highlights of the Java Servlet API 2.1

New Features in the Java Servlet API 2.2

Servlet API 2.3

Filters and Servlet Chaining

Servlet Chains

WebSphere Servlet API Support

WebSphere Advanced Edition 3.5.3 Compatibility Mode

Full Servlet 2.2 Compliance Mode

Servlet 2.2 API Support

WebSphere Extensions to the Servlet API

Oracle Application Server Servlet API Suport

Migrating Standalone Servlets to OC4J

Sample .servlet file: SnoopServlet.servlet

Migrating Cluster-Aware applications to OC4J

Configuring an OC4J Island (in OC4J standalone mode)

How OC4J Island Works (in OC4J standalone mode)

4 Migrating JSPs

Overview of JSP Pages

Parts of a JSP Page

Directives

What is a JSP container?

Life Cycle of a JSP Page

WebSphere Support for the JSP API

WebSphere-Specific Features

Batch JSP Compiler

HTML Template Extensions in JSP 0.91

WebSphere Extensions to JSP 1.0

OC4J JSP Features

Edge Side Includes for Java (JESI) Tags

Web Object Cache Tags

Oracle JDeveloper and OC4J JSP Container

Migrating from WebSphere JSP 0.91

The <REPEATGROUP> Tag

Migrating WebSphere Extensions to OC4J

<REPEAT> or <tsx:repeat> tag:

5 Migrating Enterprise Java Beans

Overview of Enterprise JavaBeans

EJB Migration Considerations

EJB Functionality and Components

The EJB Server

EJB container

EJB Specification Roles

Enterprise Bean Provider

Application Assembler

Deployer

EJB Server Provider

EJB Container Provider

System Administrator

Session Beans

Stateful Session Beans

Stateless Session Beans

Entity Beans

Container-managed Persistence (CMP) Entity Beans

Bean-managed Persistence (BMP) Entity Beans

The Entity Beans Life Cycle

Object-relational (O-R) Mapping and Persistence

EJB Transactions and Concurrency

The Java Transaction API(JTA)

Transaction Boundaries

Client-Managed Transactions

Container-Managed Transactions (CMT)

Bean Managed Transactions (BMT)

Transaction Isolation and Concurrency

EJB Caching

WebSphere 3.5.x Support for the EJB API

Read-only Methods

EJB Finder-Helper Interface

CMP in WebSphere

Transactions

EJB Inheritance

Distributed Exceptions

Access Beans

Associations Between Enterprise Beans

Migrating EJB Applications from WebSphere to OC4J

EJB Code Changes

Client Level Code Changes

Changes in Transactional Semantics

Object-relational (O-R) Mapping

Deployment of EJBs

OC4J EJB Container Setting

6 Migrating JDBC Applications

The JDBC API

Database Drivers

The DriverManager Class

Registering JDBC Drivers

The DataSource Class

Configuring Data Sources

Configuring OC4J with DB2 Database

Obtaining a Data Source Object

Connection Pooling

Migrating WebSphere Connection Pooling to Oracle Application Server

Migrating from WebSphere JDBC 2.0 connection pooling:

IBM Extensions

Data Access Beans

Connection Pool Manager

A Migrating from WebSphere 4.0

Feature Differences Between WebSphere Advanced Edition 3.5.3 and 4.0

J2EE Specification Differences Between WebSphere Advanced Edition 4.0 and Oracle Application Server

Migrating WebSphere 4.0 Servlets to Oracle Application Server

WebSphere Specific Servlet Extensions

WebSphere-Specific Deployment Descriptors

Deprecated 3.5.3 API (Supported in WebSphere 4.0)

Migrating WebSphere 4.0 JSPs to Oracle Application Server

Migrating WebSphere 4.0 EJBs to Oracle Application Server

Other Considerations

Dynamic Fragment Cache

Data Access and Sources

Index