Restful API by Java maven spring framework not working

Restful API by Java maven spring framework not working - java

I already have a maven project and try to import the spring framework
to do a basic restful application. But it seems like my restful controller can
not get the request.
My controller:
package org.itri.ccma.paas.service.event.webservice;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
#Controller
#RequestMapping(produces = "application/json")
public class MyController {
#RequestMapping(value = "/hello", method = RequestMethod.GET)
#ResponseBody
public String hello() {
return "true";
}
}
My pom.xml
...
<dependencies>
<!-- Springframework -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<build>
<finalName>PaaS</finalName>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<path>/PaaS</path>
<port>8080</port>
</configuration>
<dependencies>
</dependencies>
</plugin>
</plugins>
</build>
...
The spring config xml "rest-servlet.xml"
(put in the same folder with web.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:task="http://www.springframework.org/schema/task"
xmlns:tx="http://www.springframework.org/schema/tx" 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/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<mvc:annotation-driven />
<mvc:default-servlet-handler/>
<!-- Activates annotation-based bean configuration -->
<context:annotation-config />
<!-- Scans for application #Components to deploy -->
<context:component-scan base-package="org.itri.ccma.paas.service.event.webservice.MyController" />
</beans>
My web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp" version="3.1"
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/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd">
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/rest-servlet.xml</param-value>
</context-param>
<listener>
<listener-class> org.springframework.web.context.ContextLoaderListener </listener-class>
</listener>
<servlet>
<servlet-name>rest</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextClass</param-name>
<param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>rest</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
And I use the maven run with the Goals: tomcat7:run
After that. I expect I can connect the URL like
http://127.0.0.1:8080/PaaS/rest/hello
However its failed.
The error msg (I use Postman plug-in to test restful API) :
Postman error msg
<html>
<head>
<title>Apache Tomcat/7.0.47 - Error report</title>
<style>
<!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}-->
</style>
</head>
<body>
<h1>HTTP Status 404 - /PaaS/rest/hello</h1>
<HR size="1" noshade="noshade">
<p>
<b>type</b> Status report
</p>
<p>
<b>message</b>
<u>/PaaS/rest/hello</u>
</p>
<p>
<b>description</b>
<u>The requested resource is not available.</u>
</p>
<HR size="1" noshade="noshade">
<h3>Apache Tomcat/7.0.47</h3>
</body>
</html>
There is nothing special in server side log:
151105 11:17:35 INFO (FrameworkServlet.java:488) FrameworkServlet 'rest': initialization started
151105 11:17:35 INFO (AbstractApplicationContext.java:573) Refreshing WebApplicationContext for namespace 'rest-servlet': startup date [Thu Nov 05 11:17:35 CST 2015]; parent: Root WebApplicationContext
151105 11:17:35 INFO (AutowiredAnnotationBeanPostProcessor.java:153) JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
151105 11:17:35 INFO (FrameworkServlet.java:507) FrameworkServlet 'rest': initialization completed in 42 ms
What am I missing here ? Any suggestion? Thanks a lot!

In your rest-servlet.xml, change
<context:component-scan base-package="org.itri.ccma.paas.service.event.webservice.MyController" />
to
<context:component-scan base-package="org.itri.ccma.paas.service.event.webservice" />

Related

The requested resource [/DemoMVC_war/sum] is not available [duplicate]

This question already has answers here:
Servlet returns "HTTP Status 404 The requested resource (/servlet) is not available"
(19 answers)
Closed 6 months ago.
These are the files of my Spring MVC project:
Java controller: AddController.java
package com.mycompany;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class AddController {
#RequestMapping("/sum")
public String add(){
return "display.jsp";
}
}
War configuration file: web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>telusko</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>telusko</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
</web-app>
Index view page: index.jsp
<html>
<body>
<form action="sum">
<input type="text" name="t1"><br>
<input type="text" name="t2"><br>
<input type="submit">
</form>
</body>
</html>
Display result view page: display.jsp
<%--
Created by IntelliJ IDEA.
User: yrbar
Date: 2022-08-11
Time: 2:59 p.m.
To change this template use File | Settings | File Templates.
--%>
<%# page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
I am here
</body>
</html>
This is the pom.xml file
<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>
<groupId>com.mycompany</groupId>
<artifactId>DemoMVC</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
</properties>
<name>DemoMVC Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.3.22</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.22</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.30</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<finalName>DemoMVC</finalName>
</build>
</project>
This is my servlet configuration file: mycompany-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:ctx="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
<ctx:annotation-config></ctx:annotation-config>
<ctx:component-scan base-package="com.mycompany"></ctx:component-scan>
</beans>
And my project structure looks like this:
I'm getting the following error: The requested resource [/DemoMVC_war/sum] is not available
How can i fix this?

With your provided files i have reproduced the WAR file and deployed it in tomcat.
When you browse to http://localhost:8080/DemoMVC/ your index.jsp is loaded, and when you enter form data you're posting to http://localhost:8080/DemoMVC/sum?t1=1&t2=2
This means the URL your spring servlet should listen to must include /sum.
Currently your servlet is setup to listen to the following endpoints:
<servlet-mapping>
<servlet-name>telusko</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
But the requested URL /sum?t1=1&t2=2 does not include .htm, so this request is not forwarded to your Spring MVC servlet. Hence tomcat responds with a http 404 not found error.
You can solve this by updating your servlet configuration file to something like this:
<servlet-mapping>
<servlet-name>telusko</servlet-name>
<url-pattern>/sum/*</url-pattern>
</servlet-mapping>
You can read more on the working of the org.springframework.web.servlet.DispatcherServlet on the following page: https://docs.spring.io/spring-framework/docs/3.0.0.RC2/reference/html/ch15s02.html

Not able to access other jsp pages other then index.jsp?

I'm using eclipse IDE and trying to run a simple HelloWorld Spring MVC app. While web/index.jsp doesn't have an issue, I cannot get the /WEB-INF/views/final.jsp to display correctly (I'm using http://localhost:8080/springmvc/home ). I keep getting (404-not found) error.
Below is my setup. Any suggestions?
Thanks.
pom.xml
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0-alpha-1</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<!-- Configure dispatcher servlet -->
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<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 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">
<!--Provide support for conversion, formatting and validation -->
<mvc:annotation-driven/>
<context:component-scan base-package="springmvc.controller"/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
HomeController.java
package springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class HomeController {
#RequestMapping(value ="/home")
public String home()
{
System.out.println("This is home URL");
return "final";
}
}
index.jsp
<html>
<body>
Click here...
</body>
</html>
final.jsp
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Home Page</title>
</head>
<body>
<h1>This is home Page</h1>
</body>
</html>
Project Structure is as below

I got the reason for this error I was executing this code on tomcat version 10, from version 10 package (javax) are replaced with jakarta so dispatcherServlet was not able to detect javax package and was giving this error. I downgraded my tomcat version to 9 and it worked fine another solution could be to use packages which support jakarta insted of javax.

Spring MVC with Maven, The origin server did not find a current representation for the target resource

I am trying to build a simple webapp to apply the learnings of spring MVC, the issue occurs while configurating the dispatcher servlet.
I get this message when i click on submit button in index.jsp
HTTP Status 404 – Not Found
Type Status Report
Message The requested resource [/DemoMVC/add] is not available
Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
index.jsp
<html>
<body>
<form action="add">
<input type="text" name="t1"><br>
<input type="text" name="t2"><br>
<input type="submit"><br>
</form>
</body>
</html>
below is the web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- <load-on-startup>1</load-on-startup> -->
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
pom.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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.first</groupId>
<artifactId>DemoMVC</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>DemoMVC Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.24</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.7.32</version>
</dependency>
</dependencies>
<build>
<finalName>DemoMVC</finalName>
</build>
</project>
dispatcher servlet
<?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:p="http://www.springframework.org/schema/p"
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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.first"/>
<mvc:default-servlet-handler/>
<!-- ... -->
</beans>
Controller
package com.first;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class AddController
{
#RequestMapping("/add")
public String add()
{
return "welcome";
}
}

First of all you would have to change the name of your dispatcher servlet to xyz-servlet.(here xyz is taken as any name you like but it should be followed by -servlet.)This will help web.xml to map your dispatcher servlet. Also your dispatcher servlet should be in WEB-INF folder.
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>xyz</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>xyz</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
Also don't forget to add suffix and prefix in your xyz-servlet.xml file

Please make the following changes:
Add method attribute in . Example for 'post'
<form action="/add" method="post">
In controller either add method type OR use specific mapping annotation:
#RequestMapping(value="/add", method=RequestMethod.POST) OR #PostMapping("/add")

First I created a constructor in controller to check if controller is working.
#Controller
public class AddController
{
public AddController() {
System.out.println("################000");
}
#RequestMapping(value="/add", method = RequestMethod.GET)
public String add()
{
System.out.println("################12");
return "welcome.jsp";
}
}
and the console was printing ################000 but did not print ################12. Hence there was an issue in request mapping.
After checking
Spring MVC request mapping not working
tried implementing <mvc:annotation-driven /> in servlet and it worked

Ok So if all the things which i told you and others told you aren't working then the problem may be that you have not set the suffix amd prefix in your project.
xyz-servlet.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:p="http://www.springframework.org/schema/p"
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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.first"/>
<mvc:default-servlet-handler/>
<bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name = "prefix" value = "/webapp/jsp/"/><!--Set the path of where your have stored your view files-->
<property name = "suffix" value = ".jsp"/><!--Set the view resolver type eg. html, jsp-->
</bean>
</beans>
Now this may solve your issue!!

Http 404 after requesting to endpoint

I'm trying to write Spring application in Spring 3.0.x (yes I want that version). Made a really simple method that returns String.
package fitnessapp;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
#Controller
public class Hello {
#RequestMapping(value = "/sayHello", method = RequestMethod.GET)
#ResponseBody
public String sayHello() {
return "hello!";
}
}
After calling http://localhost:8080/sayHello I'm getting 404 don't know why.
HTTP/1.1 404
Content-Type: text/html;charset=utf-8
Content-Language: en
Content-Length: 682
Date: Fri, 04 Dec 2020 18:44:04 GMT
Keep-Alive: timeout=20
Connection: keep-alive
<!doctype html>
<html lang="en">
<head><title>HTTP Status 404 – Not Found</title>
<style type="text/css">body {
font-family: Tahoma, Arial, sans-serif;
}
...
</head>
<body><h1>HTTP Status 404 – Not Found</h1>
<hr class="line"/>
<p><b>Type</b> Status Report</p>
<p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing
to disclose that one exists.</p>
<hr class="line"/>
<h3>Apache Tomcat/8.5.60</h3></body>
</html>
I'm using Tomcat 8.5.60.
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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>stara</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.0.7.RELEASE</version>
</dependency>
</dependencies>
</project>
web.xml
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>WEB-INF/spring/webcontext/DispatcherServlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
DispartcherServlet-context.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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="fitnessapp"/>
<mvc:annotation-driven/>
</beans>
In logs I get
04-Dec-2020 21:22:38.073 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory#2f66c1fd: defining beans [hello,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0,org.springframework.format.support.FormattingConversionServiceFactoryBean#0,org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0,org.springframework.web.servlet.handler.MappedInterceptor#0]; root of factory hierarchy
04-Dec-2020 21:22:38.310 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler Mapped URL path [/sayHello] onto handler 'hello'
04-Dec-2020 21:22:38.310 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler Mapped URL path [/sayHello.*] onto handler 'hello'
04-Dec-2020 21:22:38.311 INFO [RMI TCP Connection(3)-127.0.0.1] org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler Mapped URL path [/sayHello/] onto handler 'hello'
Could you tell me what I'm doing wrong to make this Controller work?

Try this:
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
should become:
<servlet>
<servlet-name>myServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>myServlet</servlet-name>
<url-pattern>/sayHello/*</url-pattern>
</servlet-mapping>
and rename your DispartcherServlet-context.xml properly to myServlet-servlet.xml.
Your dependency in the pom should be:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.0.7.RELEASE</version>
</dependency>
or something like that.

Error 404 on SpringMVC using Maven

I keep getting this Error 404 and I've done/looked at almost all the solutions on StackOverflow that are relevant and still haven't fixed my problem. Why am I having this error?
When I do http://localhost:8080 it gives me my index.jsp page, but when I do http://localhost:8080/index.jsp of http://localhost:8080/WebApp/index.jsp it gives me 404 error.
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
dispatcher-servlet.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-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="test.app" />
<bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value = "/WEB-INF/views/"/>
<property name="suffix" value=".jsp" />
</bean>
</beans>
applicationContext.xml
index.jsp
<%--
Created by IntelliJ IDEA.
User: reaganyuan
Date: 12/31/17
Time: 12:42 PM
To change this template use File | Settings | File Templates.
--%>
<%# page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<p>HELLO WORLD</p>
</body>
</html>
TestController.java
package test.app;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class TestController {
#RequestMapping(value="/")
public String test()
{
return "index";
}
}
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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>app</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.13.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.3.13.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.3.13.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.13.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.13.RELEASE</version>
</dependency>
</dependencies>
</project>
My Project structure
edit: I changed index() into test() in the controller, but that didn't do anything.

In Web.xml try changing url-pattern to /* as shown below
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>

When you hit the url http://localhost:8080/ you are hitting the TestController which has a mapping for "/". It is returning a string "index" which will be resolved by the InternalResourceViewResolver.class into index.jsp.
You do not have any mapping to /index.jsp. In a servlet container you can't access the files like that directly. If you still want you can change your controller like this.
#Controller
public class TestController {
#RequestMapping(value={"/","index.jsp"})
public String test()
{
return "index";
}
}
But my advice is not to do like that. You should keep only the name without extension, like #RequestMapping(value={"/","index"})

We Keep Coding

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