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Problem while generating PDF from Servlet using Jasper Report

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I m facing problem while generating PDF using Japer report. below is the servlet code that is handlig client request.

response.setHeader("Content-disposition","attachment; filename=\""+ReportName+""+currDate+".pdf \"");

And generateOptionHoldingsReport method returns byte array and i am writiing this byte array to the outputstream..below is code of this method.

public byte[] generateOptionHoldingsReport(String jrxmlPath) throws Exception
logger.debug("[OptioHoldingsReport - Inside generateOptioHoldingsReport() :] ");
List dataList=new ArrayList();
byte[] reportData=null;
HashMap parameters = new HashMap();
JasperPrint jasperPrint;
parameters.put("imagePath", ReportConstants.HEADER_IMAGE_PATH);
dataList= populateData();

JasperReport jasperReport = JasperManager.loadReport(jrxmlPath);
logger.info("jasperReport: "+jasperReport);
JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(dataList);
logger.info("ds: "+ds);
reportData = JasperRunManager.runReportToPdf(jasperReport,parameters, ds);
logger.info("reportData: "+reportData);
//jasperPrint = JasperFillManager.fillReport(jasperReport,parameters, ds);
catch(Exception e)
logger.error("[ OptioHoldingsReport - generateOptioHoldingsReport ():] Exception is "+e.getMessage());
return reportData;

this api is not throwing any exeption but its not printing below line in logger. and adobe reader is showing error that it can not open pdf file due to unsupported type format.
logger.info("reportData: "+reportData);

What change i should make to generate proper PDF file.
Please suggest.

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