Was able to locate the problem. 
Earlier the code used a xlt file to start with while exporting and then make
changes to it  and then output the file as an xls file.
I had changed the code to start from a xltx file and then finally output it 
as an xlsx. This doesnt seems to work so i changed the starting template
file to a xlsx and that seems to work.
Still dont understand if the xlt to xls worked fine why does the XSSF
implementation not work for xltx to a xlsx file.


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