I am using Apache POI 3.17 to create xlsx files and filling it with data from the db. The file gets created fine but when I try to open it, I get 'incompatible format' error even though when I inspect the file, I can see that it is a Microsoft spreadsheet file. I looked at here,here and here and tried all these examples but didn't help and I don't know where the problem is. Here is my file creation code:
File excelFile = new File("C:\\myFile.xlsx"); //a new file to be created
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
Row row = sheet.createRow(rowIndex);
Cell cell;
//some font and style creation
for(String eachHeader : headers) {
cell = row.createCell(cellIndex);
cell.setCellValue(eachHeader);
cell.setCellStyle(headerStyle);
cellIndex++;
}
//some more row and cell creation
try {
//finally try to write all this content into the excel file
OutputStream out = new FileOutputStream(excelFile);
workbook.write(out);
out.close();
logger.debug("Worksheet created: " + excelFile.getAbsolutePath());
}catch(Exception exc) {
logger.error("Error occured while creating or writing to the excel file: " + exc.getMessage());
}
Again, the file is created fine with some data in it as I can see that the size is not 0, but just cannot open it, why??
