Spring mvc tomcat 404 what is the error?

Question

Java

I am developing an application using Spring MVC apache tomcat 9
But on the url localhost:8080/hello-world I get a 404 error.
What is the code error? pom.xml

source code

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an
  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  KIND, either express or implied.  See the License for the
  specific language governing permissions and limitations
  under the License.
-->
<!-- $Id: pom.xml 642118 2008-03-28 08:04:16Z reinhard $ -->
<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/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <packaging>war</packaging>

  <name>web2</name>
  <properties>
    <maven.compiler.source>1.11</maven.compiler.source>
    <maven.compiler.target>1.11</maven.compiler.target>
  </properties>
  <groupId>org.example</groupId>
  <artifactId>web2</artifactId>
  <version>1.0-SNAPSHOT</version>

  <build>
    <plugins>
      <plugin>
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>maven-jetty-plugin</artifactId>
        <version>6.1.7</version>
        <configuration>
          <connectors>
            <connector implementation="org.mortbay.jetty.nio.SelectChannelConnector">
              <port>8888</port>
              <maxIdleTime>30000</maxIdleTime>
            </connector>
          </connectors>
          <webAppSourceDirectory>${project.build.directory}/${pom.artifactId}-${pom.version}</webAppSourceDirectory>
          <contextPath>/</contextPath>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.32</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-simple</artifactId>
      <version>1.7.32</version>
      <scope>test</scope>
    </dependency>

    <!--dependency>
      <groupId>org.example</groupId>
      <artifactId>[the artifact id of the block to be mounted]</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency-->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.2.17.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.17.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.2.17.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.17.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf-spring5 -->
    <dependency>
      <groupId>org.thymeleaf</groupId>
      <artifactId>thymeleaf-spring5</artifactId>
      <version>3.0.12.RELEASE</version>
    </dependency>

  </dependencies>

</project>

web.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_3_1.xsd"
         id="WebApp_ID" version="3.1">

  <display-name>spring-mvc-app1</display-name>

  <absolute-ordering/>

  <servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/applicationContextMVC.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/*</url-pattern>
  </servlet-mapping>

</web-app>

applicationContextMVC.xml

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

    <context:component-scan base-package="web"/>

    <mvc:annotation-driven/>

    <bean id="templateResolver" class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".html"/>
    </bean>

    <bean id="templateEngine" class="org.thymeleaf.spring5.SpringTemplateEngine">
        <property name="templateResolver" ref="templateResolver"/>
        <property name="enableSpringELCompiler" value="true"/>
    </bean>

    <bean class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="templateEngine" ref="templateEngine"/>
        <property name="order" value="1"/>
        <property name="viewNames" value="*"/>
    </bean>
</beans>

HelloController.java

package web;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class HelloController {

    @GetMapping("hello-world")
    public String sayHello(){
        return "hello_world";
    }


}

hello_world.html

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

<head>
    <meta charset="ISO-8859-1">
    <title>My app</title>
</head>

<body>

<p>Hello world!</p>

</body>

</html>

What is the error in the code?

Answer 1

I can assume that you configured Tomcat incorrectly. In the settings of your IDE, you must specify the context path.
And then refer to your application like this:
localhost:8080/myPath/hello-world