source: source/src/main/java/com/example/db/controller/UsersController.java

package com.example.db.controller;

import com.example.db.model.OnlineStores;
import com.example.db.model.Users;
import com.example.db.service.UsersService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;

@Controller
@RequestMapping("/users")
public class UsersController {
    private final UsersService usersService;

    public UsersController(UsersService usersService) {
        this.usersService = usersService;
    }

    @GetMapping
    public String getUsers(@RequestParam(required = false) String error, Model model){
        if(error!=null && !error.isEmpty()){
            model.addAttribute("hasError",true);
            model.addAttribute("error",error);
        }
        else{
            List<Users> users = this.usersService.findAll();
            model.addAttribute("users", users);

        }
        return "users";
    }
}