All web browsers can print opened web sites as a PDF document, so if you open your JSPX file in one of them, you can simply export it as a PDF file.
Convert XML Java Server page to Adobe Portable document format.
We found 2 software records in the database related to .jspx to .pdf file format conversion.
Microsoft Windows software - convert jspx to pdf on Windows
A popular free web browser from Mozilla
Convert from jspx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jspx to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A popular Internet browser from Google