OpenPDF VS kitteh

Not really a JavaFX question as JavaFX is a UI framework. Your question is therefore just related to Java. To answer that I've seen a similar feature from IText (https://itextpdf.com) or OpenPDF (https://github.com/LibrePDF/OpenPDF) as an open source alternative. Maybe take a look at those for a start and check if they provide you what you're looking for.

In addition, the License file may not contain the text of the license directly but information about the licenses under which the project is published or which projects/libraries are included in it. For example OpenPDF.

Open PDF: https://github.com/LibrePDF/OpenPDF

OpenPDF is probably your best bet for all of these in one program

Alternatively, you could check some micro http server, many just require a couple of lines to setup. I've even made one myself, kitteh, otherwise there plenty to choose from, spark for example is super simple.

uhm i'll look into it when it's ready, then decide if use it on my small web server. Probably more for exploration and fun then for real need.

Spring boot is ok, altho i feel it only spread becouse of "spring". Small self contained http servers library existed before (they're pretty simple to make too, i did one myself), they were just not considered, in favour of big servers like tomcat etc.