nested exception is java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a M

nested exception is java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?] with root cause
java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?

springmvc.xml加

<!-- 定义文件上传解析器 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 设定默认编码 -->
<property name="defaultEncoding" value="UTF-8"></property>
<!-- 设定文件上传的最大值5MB，5*1024*1024 -->
<property name="maxUploadSize" value="5242880"></property>
</bean>