Thanks a lot Yegor, Finally the popup's gone and file is generated without any issues. We actually moved our code from earlier version of poi (Excel 2003 - HSSF) to poi-3.8 (Excel 2007 - XSSF). The eariler code was appending some more stuff (some garbage binary characters) to the response.getOutputStream() along with the file and Excel 2003 wasn't as restrictive as Excel 2007 in terms of validating the data in the file.
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