Project web and documentation are not consistent with regards to required Java version. Sometime it talks about version 6, sometime about version 8.
On project home page:
Launching
If you don't use windows installer, which already includes Java, you'll need a Java Runtime Environment in version 6 and newer.
In PDF docs JSignPdf Quick Start Guide:
Prerequisites
Java
If you want to use JSignPdf, and you don’t install it on Windows using the installation program, you will need Java Runtime Environment (JRE) version 8 or newer. If you don’t have it, you can download it freely from web pages, for instance
and in section Keystore it talks about about version 6
Project web and documentation are not consistent with regards to required Java version. Sometime it talks about version 6, sometime about version 8.
On project home page:
In PDF docs JSignPdf Quick Start Guide:
and in section Keystore it talks about about version 6