Spring how to pass value between controller methods?

Question

Java

recently with spring. don’t hit hard if it’s a very stupid question) I

add 2 variables to the model.

@GetMapping("/begin")
    public String starter(Model model) {
        ........
        
        model.addAttribute("citySet", setWords);
        model.addAttribute("citySuggestedSystem", citySuggestedSystem);
....
        return "begin";
    }

then I show a view where the user enters one word. and I need to process the result using these variables and a new word,

I'm trying to get these values ​​in a new controller like this:

@GetMapping("/next")
    public String customerInputNewWorld(@RequestParam String word, Model model) {
        @SuppressWarnings("unchecked")
        HashSet<String> setWords= (HashSet<String>) model.getAttribute("citySet");
        String citySuggestedSystem= (String) model.getAttribute("citySuggestedSystem");
.......
        System.out.println(citySuggestedSystem);
.....
        return "begin";
 
    }

and get null.

Am I doing something fundamentally wrong?

Answer 1

Hello!
Use SessionAttribute for this
https://stackoverflow.com/questions/37433863/how-t...

Answer 2

Yes. thank. line
@SessionAttributes({ "citySuggestedSystem", "citySet"}) solved my problem)