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 4.0 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.
2. Upgrade to IBM WebSphere Application Server Version 4.0
In most cases, migration programs are available to ease the transition.
However, some manual preparation may be necessary.
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.
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.
4. Update application code to supported specification and API levels
Note:
Support for several APIs has been removed in Version 4.0.
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.
Before you begin, be sure to read
Transitioning to Version 4.0.
That article outlines the reorganization of the Version 4.0 product
relative to Version 3.x.