define('BX_SYSTEM_JAVA', '%JAVA_PATH%'); ///< path to java binary   <<<-------------<<-

define('BX_SYSTEM_FFMPEG', '%FFMPEG_PATH%'); ///< path to ffmpeg binary
define('BX_DOL_SECRET', '%SECRET%'); ///< secret word

Is UNA doable on a shared server which does not include java? Is Java needed to download things from the store or for updates or for chat? 

I am still interested in knowing more about this matter. Thank you in advance.