SPRING MVC getting 404 error in when you hits the submit button

index.jsp

<html>
<body>

<form action="add" method="post">
 <input type="text" name="t1">
 <input type="text" name="t2">
 <input type="submit">


</form>


</body>
</html>

controller.java

package com.test;

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


    @Controller
public class addController {




      @RequestMapping("/add")
      @ResponseBody
    public String add()
    {
        return "display.jsp";
    }
}



web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- webapp/WEB-INF/web.xml -->



<web-app 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"
    version="3.0">

     <display-name>Archetype Created Web Application</display-name>

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>    


  <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/kool-servlet.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>


test-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

        <context:component-scan base-package="com.test" />

        <mvc:annotation-driven />

    </beans>

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