Contents

Title and Copyright Information

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Preface

Audience

Organization

Related Documentation

Conventions

Documentation Accessibility

1 Overview

Overview of J2EE

What is the J2EE Application Model?

What is the J2EE Platform?

What is an Application Server?

Overview of Oracle9iAS

J2EE Application Migration Challenges

J2EE Application Architecture

Migration Issues

Portability

Vendor Specificity

Deviations from J2EE 1.2 Specification

Migration Approach

Using this Guide

2 Comparison of Oracle9iAS and WebSphere Features

Application Server Product Offerings Comparison

Websphere Product Offerings

WebSphere Standard Edition

WebSphere Advanced Edition

WebSphere Enterprise Edition

Oracle9i Application Server

Architecture Comparison

IBM WebSphere Components

IBM HTTP Server

Web Server Plug-in

Administrative Server

Administrative Repository

Application Server

Oracle9iAS Components and Concepts

Oracle9iAS Instance

Oracle HTTP Server

OC4J Instances

Oracle Process Management Notification (OPMN) Service

Distributed Configuration Manager (DCM)

Oracle9iAS Infrastructure Repository

Oracle9iAS Web Cache

Clustering and Load balancing

What is Clustering?

Benefits of Clustering: Failover Recovery

What is Load Balancing?

WebSphere Suppport for Clustering and Load Balancing

Clustering in WebSphere

Load Balancing in WebSphere

Oracle9iAS Support for Clustering and Load Balancing

Oracle9iAS Clusters

OC4J Islands

J2EE Support Comparison

WebSphere J2EE support

Oracle9iAS OC4J J2EE support

Java Development and Deployment Tools

WebSphere Development and Deployment Tools

WebSphere Development Tools

Websphere Studio

WebSphere Administrative Console

Oracle9iAS 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 API 2.2 support

WebSphere Extensions to the Servlet API

Oracle9iAS 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

The OracleJSP container

The JSP Translator in Oracle9iAS OC4J

OracleJSP Extensions

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

Differences between the EJB 1.0 and EJB 1.1 Specifications

Changes Specific to Entity Beans

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 Oracle9iAS 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 Oracle9i Application Server

Migrating from Websphere JDBC 2.0 connection pooling:

IBM Extensions

Data Access Beans

Connection Pool Manager

A J2EE Server Comparison

Installation and Configuration

Code Portability

Database Connections

Security

Performance and Scalability

B 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 Oracle9iAS

Migrating WebSphere 4.0 Servlets to Oracle9iAS

WebSphere Specific Servlet Extensions

WebSphere-Specific Deployment Descriptors

Deprecated 3.5.3 API (Supported in WebSphere 4.0)

Migrating WebSphere 4.0 JSPs to Oracle9iAS

Migrating WebSphere 4.0 EJBs to Oracle9iAS

Other Considerations

Dynamic Fragment Cache

Data Access and Sources

C Partner Migration Tools

Cacheon

Features of Cacheon Migrator

TogetherSoft

Index