@ModelAttribute

@ModelAttribute is a Spring MVC annotation used to bind a method parameter or a method return value to a named model attribute. It is commonly used in Spring MVC controllers to preprocess data before rendering the view or handling form submissions.

Here is an example of using @ModelAttribute to bind method parameters:

@Controller
@RequestMapping("/products")
public class ProductController {
    
    @ModelAttribute("categories")
    public List<String> getAllCategories() {
        // Retrieve list of all categories from the database
        List<String> categories = productService.getAllCategories();
        return categories;
    }
    
    @RequestMapping(method = RequestMethod.GET)
    public String showProductForm(@ModelAttribute("product") Product product, Model model) {
        // Add new product object to the model
        model.addAttribute("product", new Product());
        return "product/form";
    }
    
    @RequestMapping(method = RequestMethod.POST)
    public String saveProduct(