Take a look at the example Spring provides for handling form submissions:
https://github.com/spring-guides/gs-handling-form-submission/tree/main/complete

It’s a basic example of a Spring MVC controller that handles forms. Let’s look at the controller class:

@Controller
public class GreetingController {

    @GetMapping("/greeting")
    public String greetingForm(Model model) {
        model.addAttribute("greeting", new Greeting());
        return "greeting";
    }

    @PostMapping("/greeting")
    public String greetingSubmit(@ModelAttribute Greeting greeting, Model model) {
        model.addAttribute("greeting", greeting);
        return "result";
    }

}

So first the user browses to GET /greeting, which returns a HTML form, which is then submitted to POST /greeting.

My question is, why do we add a Greeting object to the model in the @GetMapping method? The form is an empty form, it doesn’t do anything with this model object?