Статус HTTP 500 с java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

Прочёл другие посты, не помогло. Это версия Spring Tool Suite: 3.6.0. Когда я запускаю сервер, открывается веб-страница. После того, как я ввожу слово и нажимаю «Отправить», я получаю ошибку «Статус 500».

Снимок экрана JARS

Снимок экрана каталога

Hellocontroller.java

  package controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.*;

//import com.sun.javafx.collections.MappingChange.Map;

public class Hellocontroller implements Controller {

    @Override
    public ModelAndView handleRequest(HttpServletRequest req,
            HttpServletResponse res) throws Exception {

           String name = req.getParameter("name");

           Map m = new HashMap();
           m.put("msg", "Hello ...."+name);                             

           ModelAndView mav =new ModelAndView("success",m);

        return mav;
    }

}

HelloWorld-servlet.xml

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

    <bean
        class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />


    <bean name="/hello.ds" class="controller.Hellocontroller">
    </bean>

    <bean class="org.springframework.web.servlet.InternalViewResolver">
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean>

</beans>

веб.xml

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

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <servlet>
        <servlet-name>HelloWorld</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>*.ds</url-pattern>
    </servlet-mapping>
</web-app>

index.jsp

<h1>HelloWorld</h1>

<form action ="./hello.ds">

NAME:<input type = "text" name="name">

SUBMIT<input type = "submit" value="sayHello">


</form

успех.jsp

${msg}

Статус HTTP 500 — ошибка создания экземпляра класса сервлета org.springframework.web.servlet.DispatcherServlet

type Exception report

message Error instantiating servlet class org.springframework.web.servlet.DispatcherServlet

description The server encountered an internal error that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: Error instantiating servlet class org.springframework.web.servlet.DispatcherServlet
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    java.lang.Thread.run(Unknown Source)


root cause 

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve