Sun Java Enterprise System 5 Update 1 Upgrade Guide for Microsoft Windows

Upgrade Java DB Dependencies

It is generally recommended that all Java ES components on a computer system (and in a computing environment) be upgraded to Release 5U1. Release 5U1 Java DB has no hard upgrade dependencies, so upgrade of shared components is optional. However, the upgrade of Java DB to Release 5U1 requires that Windows Installer patch (126910–02) is already applied.