How to return a List from controller to Ajax call and print it in the success?

This is the pattern of the object I'm getting when I printed out my list value from rest controller.

[
   {
    "name": "Jon",
    "isUser": true
   },
   {
    "name": "Ween",
    "isUser": false
   }

]

but the problem is I dont know how can I get this value to my ajax call. I need that values for further work. But whenever I'm calling this controller my ajax return error 500.
this is my rest controller:

    @RequestMapping(value = "/getusers",  method = RequestMethod.GET)
    public List userShow(HttpServletRequest request, Model model) {

        List userlist = new ArrayList();
        try{
            userlist = JSONArray.fromObject(userService.getUserList());
            System.out.println(userlist);
        }catch (Exception e){
            logger.error(e);
        }
        return  userlist;
    }

I can clearly see the list of the printed userList from system.out but i'm not sure why these values are not going in the ajax call. Maybe I've to change the return of my function , I've given list as I want my data as the provided data I have given in the first part of the question.
and
my ajax call :

    $.ajax({
          type: "GET",
          url: "/getusers",
          success: function (response) {
           console.log(response);
           if(response === true) {
                  user = true;
             }
             else{
                 user = false;
              errorShow = "error getting values";
          }
      },
      async: false
  });

when this url hits, values are seen in the controller but in the console.log i see

> GET http://localhost:3000/getusers 500

error. How can I get those values in the response section?

I think you are using @Controller annotation at the class level.
If you use @RestController you will not have to write @Responsebody explicitly.

Also instead of
@RequestMapping(value = "/getusers", method = RequestMethod.GET)
you can use new method annotations like so.
@GetMapping("/getusers")

If you really want to return the List you can use ResponseEntity like this:

@RequestMapping(value = "/getusers", method = RequestMethod.GET)
public ResponseEntity <List> userShow(HttpServletRequest request, Model model) {

    List userlist = new ArrayList();
    try {
        userlist = userService.getUserList();
        System.out.println(a);
    } catch (Exception e) {
        logger.error(e);
    }

    URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/").buildAndExpand("").toUri();
    return ResponseEntity.created(uri).body(userlist);
}

Notice that I got rid of the JSONArray.fromObject() because ResposneEntity will take of converting the List into JSON for you.
Also it's preferred to specify the List type, for example: List<User>

Just use @Responsebody annotation on method level and you don't have to convert list to array anymore. Return the list directly.

Change

JSONArray.fromObject(userService.getUserList())

To

userService.getUserList()