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

异常信息：  2014-8-4 18:29:42 org.apache.catalina.core.StandardWrapperValve invoke

严重: Servlet.service() for servlet springServlet threw exception java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?   

at org.springframework.util.Assert.notNull(Assert.java:112)   

at org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.resolveName(RequestParamMethodArgumentResolver.java:151)   

at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:86)    ...   

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)   

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)   

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)   

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)   

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)   

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)   

at java.lang.Thread.run(Thread.java:662)

解决方法：  

spring mvc中上传附件，需要做两步操作

1.引入包commons-fileupload-1.3.jar，版本号可以根据项目情况调整；  

2.在spring mvc配置文件中增加配置，文件大小限制可根据项目情况调整：

<!-- 上传文件拦截，设置最大上传文件大小   10M=10*1024*1024(B)=10485760 bytes --> 

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

      <property name="maxUploadSize" value="10485760" /> 

</bean>