Can't access index file in spring boot project

I have the following controller.

package com.school.project;

import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/")
    public String AllUsers(Model model) {
        model.addAttribute("listUsers", userService.getAllUsers());
        return "users";
    }

}

and an index.html file placed in my templates folder.

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" lang="en">

<head>
    <title>Manager Site</title>
    <meta charset="UTF-8">
    <link rel="stylesheet" type="text/css" th:href="@{webjars/bootstrap/5.2.3/css/bootstrap.min.css}">
</head>

<body>
    <div class="container-fluid text-center">
        <div>
            <table>
                <thead>
                    <th>ID</th>
                    <th>E-mail</th>
                    <th>name</th>
                    <th>username</th>
                    <th>password</th>
                    <th></th>
                </thead>
                <tbody>
                    
                </tbody>
            </table>
        </div>
    </div>
</body>

</html>

But whenever I launch my application, I get the following error.

Sat May 20 18:57:06 IDT 2023
There was an unexpected error (type=Internal Server Error, status=500).
Error resolving template [users], template might not exist or might not be accessible by any of the configured Template Resolvers
org.thymeleaf.exceptions.TemplateInputException: Error resolving template [users], template might not exist or might not be accessible by any of the configured Template Resolvers

If I change the routing of my index mapping, the html will load with no problem, but if I give them the same routing, I get that error.

It is the same error. I get if I try to go to a URL with no matching template file.

I know this error has already been posted, but none of the solutions worked for me.

My service class is the following.

package com.school.project;

import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public List<User> getAllUsers() {
        List<User> users = userRepository.findAll();
        return users;
    }
}

and my model class.

package com.school.project;

import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.Table;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Entity
@Data
@Table(name = "user")
@AllArgsConstructor
@NoArgsConstructor
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private Long id;

    @Column(name = "isAdmin")
    private boolean isAdmin;

    @Column(name = "email")
    private String email;

    @Column(name = "username")
    private String userName;

    @Column(name = "name")
    private String name;

    @Column(name = "password")
    private String password;
}

Solution

I think i found the problem, The name of your file html should be the same name returned in your method AllUsers, so just replace index.html by users.html.