WARN : org.springframework.web.servlet.PageNotFound - No mapping found for HTTP request with URI in DispatcherServlet with name 'appServlet'

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

<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>

<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

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

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

<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"
xmlns:tx="http://www.springframework.org/schema/tx"
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
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

<!-- DispatcherServlet Context: defines this servlet's request-processing
    infrastructure -->

<!-- Enables the Spring MVC @Controller programming model -->
<!-- <annotation-driven /> -->
<!-- <context:annotation-config/> -->
<mvc:annotation-driven />

<!-- Handles HTTP GET requests for /resources/** by efficiently serving
    up static resources in the ${webappRoot}/resources directory -->
<!-- <resources mapping="/resources/**" location="/resources/" /> -->

<!-- Resolves views selected for rendering by @Controllers to .jsp resources
    in the /WEB-INF/views directory -->
<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url"
        value="jdbc:mysql://localhost:3306/TestDB" />
    <property name="username" value="root" />
    <property name="password" value="root" />
</bean>

<!-- Hibernate 4 SessionFactory Bean definition -->
<bean id="hibernate4AnnotatedSessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="annotatedClasses">
        <list>
            <value>com.mahender.web.model.Person</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect
            </prop>
            <prop key="hibernate.show_sql">true</prop>
        </props>
    </property>
</bean>

<bean id="personDAO" class="com.mahender.web.DAO.PersonDAOImpl">
    <property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory" />
</bean>
<bean id="personService" class="com.mahender.web.service.PersonServiceImpl">
    <property name="personDAO" ref="personDAO"></property>
</bean>
<context:component-scan base-package="com.mahender.web" />

<tx:annotation-driven transaction-manager="transactionManager"/>

<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory" />
</bean>

@RequestMapping(value = "/app")

private PersonService personService;

@Autowired(required=true)
@Qualifier(value="personService")
public void setPersonService(PersonService ps){
    this.personService = ps;
}

@RequestMapping(value = "/persons", method = RequestMethod.GET)
public String listPersons(Model model) {
    model.addAttribute("person", new Person());
    model.addAttribute("listPersons", this.personService.listPersons());
    return "person";
}

<c:url var="addAction" value="/person/add" ></c:url>

<form:form action="${addAction}" commandName="person">