code: private static void showUsage(final String message) {
  		if (message != null) {
  			System.out.println(message);
  		} // end if
  
  		System.out.println(
  			"Usage :\n\tjava -cp yahp-sample.jar:yahp.jar org.allcolor.yahp.sample.CSimpleConversion" +
  			" --url [http|file]://myuri --out /path/to.pdf [font options] [renderer options] [security options] [--help|-h]");
  		System.out.println("\t[font options]:");
  		System.out.println("\t\t[--fontpath directory where TTF font files are located]");
  		System.out.println("\t[renderer options]:");
  		System.out.println("\t(Default renderer use Flying Saucer XHTML renderer. no option.)");
  		System.out.println("\t[security options]:");
  		System.out.println("\t\t[--password password]");
  		System.out.println("\t\t[--ks keystore file path]");
  		System.out.println("\t\t[--kspassword keystore file password]");
  		System.out.println("\t\t[--keypassword private key password]");
  		System.out.println("\t\t[--cryptreason reason]");
  		System.out.println("\t\t[--cryptlocation location]");
  		if (message != null) {
  			System.exit(-2);
  		} else {
  			System.exit(0);
  		}
  	}
docs: Show the usage of the tool
  
  @param message An error message