.jar works on Windows and Linux but not OSX
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I recently made an application for a community I'm part of,
Because I run Windows and don't have access to other OSes at the moment,
I posted it saying it was untested on Linux & OSX and people have reported back that it runs fine on Linux and Windows but fails to even start on OSX, One person posted the output when they tried to run it and this is what they got:

    ccemu.jar: line 1: PK: command not found
    ccemu.jar: line 2:???@: command not found
    ccemu.jar: line 3???@D?: command not found
    ccemu.jar: line 4: syntax error near unexpected token `('
    ccemu.jar: line 4: `?|?META-INF/MANIFEST.MFM??? Ew??Q^(1j???M7W?ħ???<p??K7??s?1??o?9?ة?}?#???C??z^?Jᘰ?S?ݿ????~X???I??kb,??J1b??͘s??????m??=-_?)??PK'

Obviously I have no clue what any of those errors mean otherwise I wouldn't be here,
Hopefully someone can insight me. 