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3: Migration overview

3: Migration overview

Migration focuses on leveraging the existing environment and applications, changing them to be compatible with the current product version, instead of starting from the beginning.

Migration for IBM WebSphere Application Server Version 3.5 includes the following activities:

Activity Where to find instructions
1. Migrate or upgrade product prerequisites to supported versions

As the product version changes, its prerequisites or corequisites also change. It is probably necessary to update your database, Web server, JDK version, and other software.


Article 3.1
2. Upgrade to IBM WebSphere Application Server Version 3.5

In most cases, migration programs are available to ease the transition. However, some manual preparation may be necessary. For example, Version 3.5 offers options for backing up product customizations (such as Version 3.0x modifications to the Web server configuration file) before installing the Version 3.5 code, allowing preserved changes to be migrated to Version 3.5.

To determine the version and release of your current installation, click Help > About from the menu bar of the Java administrative console.

Programmatic support for migration from Version 2.0x is not provided. To migrate your installation from Version 2.0x, follow the documentation, starting at article 3.2.1.


Article 3.2. See also Installing the product
3. Update application code to supported specification and API levels

Note: Article 3.3.2a describes the migration issues with using the Java Servlet API 2.2 specification.

Section 4 of the InfoCenter focuses on developing new applications, though it also outlines new APIs whose functions you might add to existing applications in a piecemeal fashion.


Article 3.3
4. Redeploy applications on Version 3.5 Article 6.4.2
5. Migrate administrative configurations

If your company has been using a previous product version, the system administrator has probably fine-tuned various application and server settings for the environment. It is important to have a strategy for migrating these settings with maximum efficiency and minimal loss.


Article 3.4
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