Spring MVC表单验证不起作用

我正在使用Spring4。我的表单包含以下变量：

@NotNull
@Email
private String email;
@NotNull
private String firstName;
@NotNull
private String lastName;
@Digits(fraction = 0, integer = 10)
private String phoneNo;
@NotNull
private String role;

我的控制器：

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping(value = "/add", method = RequestMethod.POST)
    public ModelAndView add(@ModelAttribute("user") @Valid UserBean user, BindingResult result) {
    String message;
    if (result.hasErrors() && user != null)
        return new ModelAndView("userAdd");
    else {
        userService.addUser(user);
        message = "Successfully added user";
    }
    return new ModelAndView("success", "message", message);
    }

    @RequestMapping(value = "/register")
    public ModelAndView register(@ModelAttribute("user") UserBean user, BindingResult result) {
    List<String> roles = new ArrayList<String>();
    roles.add("Receiver");
    roles.add("Resolver");
    roles.add("Logger");
    Map<String, List<String>> model = new HashMap<String, List<String>>();
    model.put("roles", roles);
    return new ModelAndView("userAdd", "model", model);
    }
}

我的jsp：

<c:url var="userAdd" value="user/add.do" />
    <sf:form method="post" action="${userAdd}" modelAttribute="user">
        <table>
            <tr>
                <td>First Name</td>
                <td><sf:input path="firstName" /><br /> <sf:errors
                        path="firstName" cssClass="error" /></td>
            </tr>
            <tr>
                <td>Last Name</td>
                <td><sf:input path="lastName" /><br /> <sf:errors
                        path="lastName" cssClass="error" /></td>
            </tr>
            <tr>
                <td>Email</td>
                <td><sf:input path="email" /><br /> <sf:errors
                        path="email" cssClass="error" /></td>
            </tr>
            <tr>
                <td>Phone No.</td>
                <td><sf:input path="phoneNo" /><br /> <sf:errors
                        path="phoneNo" cssClass="error" /></td>
            </tr>
            <tr>
                <td>Role</td>
                <td><sf:select path="role" items="${model.roles}" /><br /> <sf:errors
                        path="role" cssClass="error" /></td>
            </tr>
            <tr>
                <td><input type="submit" value="Submit" /></td>
            </tr>
        </table>
    </sf:form>

当我将输入保留为空白时，该表单不会生效，也不会引发任何错误。该BindingResult不会有任何错误。

我的图书馆是：

我的dispatcher-serlvet.xml是：

<?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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        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">
    <!-- Scans for annotated @Controllers in the classpath -->
    <context:component-scan base-package="com.mj.cchp.controller">
        <context:include-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
    <bean id="myBeansValidator"
        class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />
    <mvc:annotation-driven validator="myBeansValidator" />
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/pages/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>
</beans>

我的applicationContext是：

<?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"
    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">
    <!-- Scans for annotated @Controllers in the classpath -->
    <context:component-scan base-package="com.mj.cchp">
        <context:exclude-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.ibm.db2.jcc.DB2Driver" />
        <property name="url" value="jdbc:db2://172.16.2.181:60000/CCHP" />
        <property name="username" value="db2inst1" />
        <property name="password" value="db2inst1" />
    </bean> 
</beans>

我的web.xml是：

<?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_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <display-name>CCHP</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>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/application-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>
</web-app>