public List<Department> getUpdatedListAfterDepartmentDeletion(Integer id) {
   studentBusinessService.updateDepartmentInStudent(id);
   Department dept = departmentDao.fetchDepartmentById(id);
   departmentDao.deleteDepartment(dept);
   return departmentDao.fetchAllDepartments();
 }
 public List<Department> fetchAllDepartments() {
   return departmentDao.fetchAllDepartments();
 }