HelloWorld SpringMVC - HTTP Status 404

Im trying to create my first Spring MVC project but I keep getting error http status 404.

If i try to open an .jsp file outside of /views (So not using Spring MVC) it works fine

Here are my files:

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>fj21-tarefas</display-name>

  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/spring-context.xml
        </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

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

</web-app>

spring-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:context="http://www.springframework.org/schema/context"    
  xmlns:mvc="http://www.springframework.org/schema/mvc"    
  xmlns:p="http://www.springframework.org/schema/p"
  xsi:schemaLocation="http://www.springframework.org/schema/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-4.1.xsd">    


    <context:component-scan base-package="br.com.caelum.tarefas" />   
    <mvc:annotation-driven />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">   
        <property name="prefix" value="/WEB-INF/views/"/>   
        <property name="suffix" value=".jsp"/>
    </bean>   

</beans>

Controller

package br.com.caelum.tarefas.controller;

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

@Controller
public class OlaMundoController {

    @RequestMapping("/olaMundoSpring")
    public String execute(){
        System.out.println("Executando a lógica com Spring MVC");
        return "ok";
    }

}

Libs

aopalliance-1.0.jar
commons-logging-1.2.jar
javax.servlet.jsp.jstl-1.2.1.jar
javax.servlet.jsp.jstl-api-1.2.1-3.jar
jcl-over-slf4j-1.7.12.jar
joda-time-2.4.jar
log4j-over-slf4j-1.7.12.jar
slf4j-api-1.7.12.jar
slf4j-log4j12-1.7.12.jar
spring-aop-4.1.7.RELEASE.jar
spring-aspects-4.1.7.RELEASE.jar
spring-beans-4.1.7.RELEASE.jar
spring-context-4.1.7.RELEASE.jar
spring-context-support-4.1.7.RELEASE.jar
spring-core-4.1.7.RELEASE.jar
spring-expression-4.1.7.RELEASE.jar
spring-instrument-4.1.7.RELEASE.jar
spring-instrument-tomcat-4.1.7.RELEASE.jar
spring-jdbc-4.1.7.RELEASE.jar
spring-jms-4.1.7.RELEASE.jar
spring-messaging-4.1.7.RELEASE.jar
spring-orm-4.1.7.RELEASE.jar
spring-oxm-4.1.7.RELEASE.jar
spring-test-4.1.7.RELEASE.jar
spring-tx-4.1.7.RELEASE.jar
spring-web-4.1.7.RELEASE.jar
spring-webmvc-4.1.7.RELEASE.jar
spring-webmvc-portlet-4.1.7.RELEASE.jar
spring-websocket-4.1.7.RELEASE.jar