Introduction to Upgrading Application Server

When upgrading Java ES 4 Application Server to Java ES 5, consider the following aspects of the upgrade process:

• General Upgrade Approach. Java ES 5 does not provide any in place upgrade support.

• Upgrade Dependencies. Application Server has dependencies on a number of Java ES shared components, as listed in Table 1–7. Java ES 5 Application Server is compatible with the Release 4 version of all these components.

• Backward Compatibility. Java ES 5 Application Server is backwardly compatible with the Java ES 4 provided the shared component dependency is not broken.

• Upgrade Rollback. Rollback of the Java ES 5 upgrade to Java ES 4 is achieved by uninstallling the Java ES 5 and reinstalling Java ES 4.