Hashmap: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String

I am trying to do simple edit for my web application for that i am getting stringify data from frontend, so i converted it into object but then i am getting id as Long value.my code works fine with add new data but whenever i tried to edit it gives error
java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String.
Please check the screenshot i provided.

Controller.java

	@RequestMapping(value = "/product", method = RequestMethod.POST)
public String managePostProduct(@RequestParam(name = "data", required = false) String add,
	 	@RequestParam(name = "file") MultipartFile file,
	 	HttpServletRequest request) {
	try {
		JSONParser parser = new JSONParser();
		Object obj = parser.parse(add);
		Addproductdetails detail = new Addproductdetails();
		OurProducts mProduct = detail.addproduct(obj, file);

		if (mProduct.getId() == 0) {

			productDAO.addOurProducts(mProduct);

		} else {
			productDAO.update(mProduct);
		}

		if (!mProduct.getFile().getOriginalFilename().equals("")) {
			FileUploadUtility.uploadFile(request, mProduct.getFile(), mProduct.getCode());
		}
	} catch (ParseException e) {
		e.printStackTrace();
	}
	return "redirect:/manage/product?success=product";
}

Addproductdetails,java

	public OurProducts addproduct(Object obj , MultipartFile file) {
    ObjectMapper oMapper = new ObjectMapper();
	Map<String, String> prod = oMapper.convertValue(obj, HashMap.class);

	System.out.println("prod "+ prod);
	OurProducts product = new OurProducts();

	if (prod.containsKey("id")) {			
		System.out.println("product === " + prod.values());
	}
	
	int id = prod.containsKey("id") && !prod.get("id").isEmpty() ? Integer.parseInt((String) prod.get("id")) : 0;
	product.setId(id);
	product.setProduct_name(prod.get("product_name"));
	product.setProduct_info(prod.get("product_info"));
	product.setFile(file);
	return product;	
}

breakpoints

please tell me why i am getting id as Long value? How can i fix it?

You are getting id field from client with type of Long and trying to put it into an int type.
If you can change Product class, I recommend to change its id field type to long so that no casting is needed also you might face data loss in casting long to int.

by the way if you can not change your code or don't want to, here you can fix the problem:

instead of:

int id = prod.containsKey("id") && !prod.get("id").isEmpty() ? Integer.parseInt((String) prod.get("id")) : 0;

use this:

int id = prod.containsKey("id") && !prod.get("id").isEmpty() ? (int) prod.get("id") : 0;

good luck