Как исправить «Статус HTTP 404» Spring MVC

У меня проблема с моим веб-приложением Spring: оно показывает Apache Tomcat/4.0.6 — HTTP-статус 404 — /spring-mvc-example/ (запрошенный ресурс (/spring-mvc-example/) недоступен.) I' Я схожу с ума от этой ошибки, и я не знаю, что делать. Я использую СТС. Спасибо за помощь! Вот как организованы папки. https://i.stack.imgur.com/ded48.png

веб.xml

<?xml version = "1.0" encoding = "UTF-8"?>
<web-app xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
xmlns = "http://xmlns.jcp.org/xml/ns/javaee" 
xsi:schemaLocation = "http://xmlns.jcp.org/xml/ns/javaee 
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id = "WebApp_ID" 
version = "4.0">
<display-name>spring-mvc-example</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<display-name>spring-mvc-example</display-name>

<!-- Add Spring MVC DispatcherServlet as front controller -->
<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring-servlet.xml</param-value>
        </init-param>
    <load-on-startup>1</load-on-startup>
   </servlet>

<servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>/*</url-pattern> 
</servlet-mapping>
</web-app>
spring-servlet.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<beans:beans xmlns = "http://www.springframework.org/schema/mvc" 
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
xmlns:beans = "http://www.springframework.org/schema/beans"
xmlns:context = "http://www.springframework.org/schema/context"
xsi:schemaLocation = "http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context.xsd">

<!-- DispatcherServlet Context: defines this servlet's request-processing 
    infrastructure -->

<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />
<context:component-scan base-package = "com.spring" />

<!-- Resolves views selected for rendering by @Controllers to .jsp resources 
    in the /WEB-INF/views directory -->
<beans:bean
    class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
    <beans:property name = "prefix" value = "/WEB-INF/views/" />
    <beans:property name = "suffix" value = ".jsp" />
</beans:bean>

пом.xml

<project xmlns = "http://maven.apache.org/POM/4.0.0" 
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>spring-mvc-example</groupId>
<artifactId>spring-mvc-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Spring MVC Example</name>
<description>Picco esempio</description>
<!-- Add Spring Web and MVC dependencies -->
<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.3.9.RELEASE</version>
    </dependency>
    <!-- Servlet -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
</dependencies>
<build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    <plugin>
    <artifactId>maven-war-plugin</artifactId>
    <version>3.2.1</version>
    <configuration>
      <warSourceDirectory>WebContent</warSourceDirectory>
    </configuration>
  </plugin>
</plugins>

HomeController.java

package com.spring.controller;

import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.spring.model.User;


@Controller

public class HomeController {

/**
 * Simply selects the home view to render by returning its name.
 */
@RequestMapping(value = "/", method = RequestMethod.GET)
public String home(Locale locale, Model model) {
    System.out.println("Home Page Requested, locale = " + locale);
    Date date = new Date();
    DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, locale);

    String formattedDate = dateFormat.format(date);

    model.addAttribute("serverTime", formattedDate);

    return "home";
}

@RequestMapping(value = "/user", method = RequestMethod.POST)
public String user(@Validated User user, Model model) {
    System.out.println("User Page Requested");
    model.addAttribute("userName", user.getUserName());
    return "user";
}

}

home.jsp

<%@ page language = "java" contentType = "text/html; charset=UTF-8"
pageEncoding = "UTF-8"%>
<%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c"%>
<%@ page session = "false"%>
<html>
  <head>
    <title>Home</title>
 </head>
  <body>
<h1>Hello world!</h1>
    <P>The time on the server is ${serverTime}.</p>
     <form action = "user" method = "post">
       <input type = "text" name = "userName"><br> 
       <input type = "submit" value = "Login">
 </form>
  </body>
</html>

user.jsp

%@ page language = "java" contentType = "text/html; charset=UTF-8"
pageEncoding = "UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
    <meta http-equiv = "Content-Type" content = "text/html; charset=UTF-8">
    <title>User Home Page</title>
  </head>
  <body>
    <h3>Hi ${userName}</h3>
  </body>
</html>