[Spring 에러] nested exception is java.lang.IllegalStateException: Current request is not of type [org.springframework.web.multipart.MultipartHttpServletRequest]

MultipartHttpServletRequest 에러

[문제]

파일 업로드시 다음과 같은 에러 

nested exception is java.lang.IllegalStateException: Current request is not of type [org.springframework.web.multipart.MultipartHttpServletRequest]

[해결책]

MULTIPART RESOLVERS 를 빼먹었다. 넣어주자 

<!-- MULTIPART RESOLVERS -->  

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

<property name="maxUploadSize" value="1000000000" />

</bean>