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The below overwrites the existing sheet. But not create a new sheet.

What I have tried:

File f= new File(System.getProperty("user.dir")+"\\src\\test\\resources\\Exceldata.xls");		
		HSSFWorkbook workbook = new HSSFWorkbook();			
		HSSFSheet worksheet= workbook.createSheet("Sheet4");		
		HSSFRow row = worksheet.createRow(1);
		HSSFCell cell= row.createCell(1);
Posted 11-Oct-18 0:09am
Updated 3 days ago
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Solution 1

See Workbook (POI API Documentation)[^]. Always best to read the documentation first.
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Solution 2

I had to downgrade apache poi jar from 4.0 to 3.14 to make it work.

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