File corrupted when writing to it using in java using Apache POI 3.17

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Learn more about Teams private static Workbook wb; private static FileOutputStream fos; private static FileInputStream fis; private static org.apache.poi.ss.usermodel.Sheet sh; private static Row row; private static Cell cell; public static void main(String[] args) throws Exception { fis = new FileInputStream("./javabook.xlsx"); wb = WorkbookFactory.create(fis); sh = wb.getSheet("Sheet1"); row =sh.getRow(1); cell = row.createCell(0); cell.setCellValue("ibrahim1"); fos = new FileOutputStream("./javabook.xlsx"); wb.write(fos); fos.close(); System.out.println("Done");

It worked for the first time and the text "ibrahim01" has appeared on the cell However when i ran it the second time i got this error:-

 Exception in thread "main" org.apache.poi.EmptyFileException: The supplied file was empty (zero bytes long)
at org.apache.poi.util.IOUtils.peekFirstNBytes(IOUtils.java:74)
at org.apache.poi.util.IOUtils.peekFirst8Bytes(IOUtils.java:57)
at org.apache.poi.poifs.filesystem.FileMagic.valueOf(FileMagic.java:135)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:177)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:149)
at package1.ClassA1.main(ClassA1.java:25)
picture of error when i open the file(javabook.xlsx)
enter image description here
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ClassA1 {
    private static XSSFWorkbook wb;
    private static FileOutputStream fos;
    private static XSSFSheet sh;
    private static Row row;
    private static Cell cell;
    public static void main(String[] args) throws Exception {
        wb = new XSSFWorkbook();
        sh = wb.createSheet("Sheet1");
        row = sh.createRow(0);
        cell = row.createCell(0);
        cell.setCellValue("ibrahim1");
        fos = new FileOutputStream("./javabook.xlsx");
        wb.write(fos);
        fos.close();
        System.out.println("Done");
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