see https://gist.github.com/LolHens/ee821a5cd1b2031856b21a0e78e1ecc9 for universalScript

universalJar.scala

def defaultUniversalScript(javaOpts: Seq[String] = Seq.empty,
                           shebang: Boolean,
                           console: Boolean = true): Seq[String] = {
  val javaOptsString = javaOpts.map(_ + " ").mkString
  Seq(universalScript(
    shellCommands = {
      def javaCommand(args: String): String =
        if (console) s"exec java $args"
        else s"nohup java $args </dev/null &>/dev/null &"

      "if [ -n \"$JAVA_HOME\" ]; then PATH=\"$JAVA_HOME/bin:$PATH\"; fi\n" +
        javaCommand(s"""-jar $javaOptsString$$JAVA_OPTS "$$0" "$$@"""")
    },
    cmdCommands = {
      def javaCommand(args: String): String =
        if (console) s"java $args"
        else
          s"""start "" javaw $args"""

      "if not \"%JAVA_HOME%\"==\"\" set \"PATH=%JAVA_HOME%\\bin;%PATH%\"\n" +
        javaCommand(s"""-jar $javaOptsString%JAVA_OPTS% "%~dpnx0" %*""")
    },
    shebang = shebang
  ))
}