SpreadSheet Writer is not working

[Naveen-Kumar-Reddy-Murthi]

package org.example;

import io.github.millij.poi.ss.model.annotations.Sheet;
import io.github.millij.poi.ss.model.annotations.SheetColumn;
import io.github.millij.poi.ss.writer.SpreadsheetWriter;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;

public class App 
{
    public static void main( String[] args ) throws IOException {
        Employee employee = new Employee(1, "Naveen");
        SpreadsheetWriter spreadsheetWriter = new SpreadsheetWriter(new File("Emp.xlsx"));
        spreadsheetWriter.addSheet(Employee.class, Arrays.asList(employee),"Employee");
        spreadsheetWriter.write();

    }
}

@Sheet
 class Employee {

    @SheetColumn("Id")
    private Integer id;

    @SheetColumn("Name")
    private String name;

    public Employee(Integer id, String name) {
        this.id = id;
        this.name = name;
    }

    public Employee() {
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

This doesn't write data to an excel file. Just generates a file with headers but no data.