Hide java (.jar) file in dock

help. im using mrpostman with thunderbird. i set up mrpostman.jar to open automatically everytime i login. i checked the "hide" button.. but upon restart i still see the java file/icon in the dock. is there anyway i can hide this? please help...

so is it safe to say that there is ABSOLUTELY NO WAY to make "java" no appear in the dock?
if that is the case, how can i possibly change the icon of that file? i tried the getinfo+paste but the icon only changed in the finder window and not the dock.. and i noticed there is no "show package contents" for jar files..

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