Error while uploading file to Spring Boot app: “Un

Question

Here is the Upload Controller that I am trying to read the .ods file with. I am reading each cell one by one through Java Workbook.

@RestController
public class UploadController {
    @ApiOperation(value = "Upload mappings excel file", notes = "Uploads the excel file and stores on couchbase")
    @ApiResponses(value = {
            @ApiResponse(code = 200, message = "File uploaded successfully"),
            @ApiResponse(code = 500, message = "Internal server error"),
            @ApiResponse(code = 400, message = "Bad request")
    })

    @RequestMapping(value = "/upload", method = RequestMethod.PUT, produces = MediaType.APPLICATION_JSON_VALUE, consumes = "multipart/form-data")
    public void uploadMappingsExcel(
            @ApiParam(value = "file", example = "user.ods", required = true)
            @RequestParam(value = "file", required = false) MultipartFile multipartFile) throws IOException{
        Path  path = null;
        for(MultipartFile file : Collections.singleton(multipartFile)) {
            path = Paths.get(file.getOriginalFilename());
            Files.write(path,file.getBytes());
        }
        FileInputStream file = new FileInputStream(path.toString());
        XSSFWorkbook workbook = new XSSFWorkbook(file);

        Sheet sheet = workbook.getSheetAt(0);
        DataFormatter dataFormatter = new DataFormatter();
        Iterator<Row> rowIterator = sheet.iterator();

        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();
            Iterator<Cell> cellIterator = row.cellIterator();
            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();
                String cellValue = dataFormatter.formatCellValue(cell);
                System.out.print(cellValue + "\t");
            }
            System.out.println();

        }

    }

I am trying to upload the .ods file through Postman.