Spring MVC - HTTP Status 404 – Not Found-CodePudding

I am trying to create a simple Spring MVC to view main-menu.jsp but I have problem and I do not how to fix it. I am using Intellij and create project by Maven.

Here is my structure of my project

src
  - main 
      - java 
        - com.example.mvc
           - HomeController.java
      -resources
  - webapp
      - WEB-INF
        - view 
            - main-menu.jsp
        - applicationContext.xml
        - web.xml

My pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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>Demo</name>
  <properties>
    <maven.compiler.source>18</maven.compiler.source>
    <maven.compiler.target>18</maven.compiler.target>
  </properties>
  <groupId>org.example</groupId>
  <artifactId>Demo</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>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.3.20</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.3.20</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.3.20</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
      <scope>provided</scope>
    </dependency>

  </dependencies>

</project>

My web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4"
         xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
  </context-param>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

My applicationContext.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:util="http://www.springframework.org/schema/util"
       xmlns:configurator="http://cocoon.apache.org/schema/configurator"
       xmlns:avalon="http://cocoon.apache.org/schema/avalon" xmlns:mvc="http://www.springframework.org/schema/cache"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                           http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd
                           http://cocoon.apache.org/schema/configurator http://cocoon.apache.org/schema/configurator/cocoon-configurator-1.0.1.xsd
                           http://cocoon.apache.org/schema/avalon http://cocoon.apache.org/schema/avalon/cocoon-avalon-1.0.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">


    <context:component-scan base-package="com.example.mvc"></context:component-scan>
    <mvc:annotation-driven />
    <bean id="handlerMapping" />
    <bean >
        <property name="prefix" value="/WEB-INF/view/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

My HomeController.java

package com.example.mvc;


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


@Controller
public class HomeController {

    @RequestMapping(value = "/hello")
    public String getPage(){
        return "main-menu";
    }
}

Finally, My main-menu.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h2>Spring MVC demo</h2>
</body>
</html>

I try to run in Tomcat server in Intellij , And It give me 404 error like this

Error Image

Thank you for helping me fix this

CodePudding user response：

Tomcat 10 does not work with Spring 5 due to the fact that Tomcat 10 is working with jakarta packages, which were renamed from javax.

Spring 5 does not work with jakarta packages, Spring 6 will support that. So with that in mind:

Spring 5 Tomcat 9
Spring 6 Tomcat 10

Also from the picture that you provided your url should be

localhost:8080/spring_war_exploaded/hello

not

localhost:8080/hello

To be sure which URL can be you can go to your Tomcat configuration > Edit > and check "After Launch" and select Google Chrome for an example, that will launch the app with the correct URL.

CodePudding user response：

The directory webapp should be inside main, not in the same parent directory.

As per convention, we place our JSP files in the ${project.basedir}/main/webapp/WEB-INF/jsp/ directory.

https://www.baeldung.com/spring-boot-jsp#view-resolver-configuration

CodePudding user response：

Try to add this dependency first. It will automatically configure your web application and DispatcherServlet. You do not need your web.xml file anymore. Also, you can delete your webapp package. Everything will be done by Spring Boot.

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
  <version>2.7.0</version>
</dependency>

Then, create a class annotated with @SpringBootApplication. It will start your application, and your @RestController class will be detected and scanned.

@SpringBootApplication
public class RunApp {
    
    public static void main(String[] args) {
        SpringApplication.run(RunApp.class, args);
    }
}

Also, you do not need your applicationContext.xml file anymore. Spring Boot takes responsibility for this. Spring Boot creates its own ApplicationContext and contains all the controllers and other beans.

Here, you can learn everything in more detail: https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/

Good luck!