title: How to use Java jar library with only one file in it? What is this file?
body: <p>I have to use this java library <a href="https://efs.uspto.gov/TruePassSampleApp/servlets/AppletDownloadServlet/entrusttruepassapplet.jar" rel="nofollow noreferrer">https://efs.uspto.gov/TruePassSampleApp/servlets/AppletDownloadServlet/entrusttruepassapplet.jar</a> but this JAR contains single file and i don't know what that file is. Can anyone hint me how to use such JAR?</p>