Spring controller is not being called - spring

Question

I am new in spring application. I am trying to create small spring application but I am getting 404 error message. Seems like controller (indexController) is not begin called. I tired to debug but its not going there.
Files location:
/WebContent/WEB-INF/pages/index.html
/WebContent/WEB-INF/HelloWeb-servlet.xml
/WebContent/WEB-INF/web.xml
HelloWeb-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-4.0.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="com.requestengine.controller" />
IndexController.java
package com.requestengine.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class IndexController {
#RequestMapping("/")
public String index(){
return "index";
}
}
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></display-name>
<servlet>
<servlet-name>HelloWeb</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>HelloWeb</servlet-name>
<url-pattern>*.html</url-pattern>
<url-pattern>*.htm</url-pattern>
<url-pattern>*.jason</url-pattern>
<url-pattern>*.xml</url-pattern>

Answer 1

HTTP 404 means the URL is not found:
https://en.wikipedia.org/wiki/HTTP_404
It usually tells me that my packaging or mapping or request URL is incorrect.
Start with the basics: write an index.html page and see that it's displayed.
It's not typical to have an index controller. Once you have that page working, see if you can map to something meaningful.
Is that controller in a package? I don't see a package statement at the top. It's impossible to be a Spring developer without being a solid Java developer first. No one would create a class without a package.

Answer 2

I modified your code a bit to make it work.
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></display-name>
<servlet>
<servlet-name>HelloWeb</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/HelloWeb-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>HelloWeb</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
</web-app>
IndexController.java
package com.requestengine.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class IndexController {
#RequestMapping("/")
#ResponseBody
public String index(){
return "index";
}