If you use nestable zip protocols, Java does not support the zip protocol, you will need to use the ZipStreamHandlerFactory class to support this protocol.
If you use nestable jar protocols, unfortunately, Java does explicitly throw an exception since some time if you even try to create a nested jar. If you can, rather use nested zips.
What is the history of this project, and what is its roadmap?
This project is a copy of the java.net project of the same name "mdiutilities.dev.java.net". I own the two projects, and I ported the java.net project infrastructure to sourceforge because java.net hosting infrastructure has been closed (April 2017).
The associated java.net project exists since 2006.