Indeed, it worked for Java. One big problem though: it rendered the code with every line of code underlined, and in rather poor quality. Hmmmmm... it seems latex plugin doesn't cut it, at least for me.
I will proceed with the LibreOffice Writer imported odt. This path satisfied my requirements. Now concentrating on building a special converter according to two syntax highlighting shema needed in my book.
I will update my thread with my progress. Thank you! If there are any other developments, I receive them with gladness and joy. I just wish someone will pick up this issue and make it work natively for there is a big need to make beautiful materials in the field of programming. Our young must be attracted in a rather dry abstract world by how we pack the info. Many blessings to the coder(s) developing that import plugin preserving color formating.