Oracle Database 26ai is now availble. If you haven't you downloaded already: Why?
Purpose
Encapsulates undo logic for removing Java system objects during upgrade/downgrade and for full removal of Java to back out of the results of a failed initjvm.
The package contains private objects not exposed via the package specification.
Warning: The RUN and STRIP objects in this package are destructive. Executing them make render a database unrecoverable.
The examples here are for education purposes only and not intended to encourage anyone to believe they are safe to execute.