java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?

    <!--Mutipart解析器 -->
    <bean id="multipartResolver"  
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <!-- 上传文件大小上限，单位为字节（10MB） -->
        <property name="maxUploadSize">  
            <value>10485760</value>  
        </property>  
        <!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 -->
        <property name="defaultEncoding">
            <value>UTF-8</value>
        </property>
    </bean>