Spring using mutipartfile Upload file Error "Failed to instantiate [Org.springframework.web.multipart.MultipartFile]"

Error Scenario:

Using the SSM framework to implement file upload times wrong "Failed to instantiate [Org.springframework.web.multipart.MultipartFile]" error, controller source code:

@Controller @requestmapping ("/file") Public classFileudcontroller {@RequestMapping (value= "/fileupload", method=requestmethod.post) PublicModelandview fileUpload (multipartfile file,httpservletrequest req) {String path= Req.getsession (). Getservletcontext (). Getrealpath ("Upload"); String FileName=File.getoriginalfilename (); File dir=NewFile (path,filename); if(!dir.exists ())        {Dir.mkdirs (); }                Try{File.transferto (dir); } Catch(IllegalStateException e) {//TODO auto-generated Catch blockE.printstacktrace (); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); } modelandview MV=NewModelandview ("Success"); returnMV; }

error message:

1SEVERE:Servlet.service () forservlet [Springdispatcherservlet] in the context with path [/SQLT] threw exception [Request processing failed; nested exceptio N is org.springframework.beans.BeanInstantiationException:Failed to instantiate [ Org.springframework.web.multipart.MultipartFile]: Specifiedclassis anInterface] with root cause2Org.springframework.beans.BeanInstantiationException:Failed to instantiate [ Org.springframework.web.multipart.MultipartFile]: Specifiedclassis anInterface3At Org.springframework.beans.BeanUtils.instantiateClass (beanutils.java:101)4At Org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveModelAttribute ( handlermethodinvoker.java:775)5At Org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments ( handlermethodinvoker.java:368)6At Org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod ( handlermethodinvoker.java:172)7At Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod ( annotationmethodhandleradapter.java:446)8At Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle ( annotationmethodhandleradapter.java:434)9At Org.springframework.web.servlet.DispatcherServlet.doDispatch (dispatcherservlet.java:959)TenAt Org.springframework.web.servlet.DispatcherServlet.doService (dispatcherservlet.java:893) OneAt Org.springframework.web.servlet.FrameworkServlet.processRequest (frameworkservlet.java:967) AAt Org.springframework.web.servlet.FrameworkServlet.doPost (frameworkservlet.java:869) -At Javax.servlet.http.HttpServlet.service (httpservlet.java:661) -At Org.springframework.web.servlet.FrameworkServlet.service (frameworkservlet.java:843) theAt Javax.servlet.http.HttpServlet.service (httpservlet.java:742) -At Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (applicationfilterchain.java:231) -At Org.apache.catalina.core.ApplicationFilterChain.doFilter (applicationfilterchain.java:166) -At Org.apache.tomcat.websocket.server.WsFilter.doFilter (wsfilter.java:52) +At Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (applicationfilterchain.java:193) -At Org.apache.catalina.core.ApplicationFilterChain.doFilter (applicationfilterchain.java:166) +At Org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal (characterencodingfilter.java:85) AAt Org.springframework.web.filter.OncePerRequestFilter.doFilter (onceperrequestfilter.java:107) atAt Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (applicationfilterchain.java:193) -At Org.apache.catalina.core.ApplicationFilterChain.doFilter (applicationfilterchain.java:166) -At Org.apache.catalina.core.StandardWrapperValve.invoke (standardwrappervalve.java:198) -At Org.apache.catalina.core.StandardContextValve.invoke (standardcontextvalve.java:96) -At Org.apache.catalina.authenticator.AuthenticatorBase.invoke (authenticatorbase.java:504) -At Org.apache.catalina.core.StandardHostValve.invoke (standardhostvalve.java:140) inAt Org.apache.catalina.valves.ErrorReportValve.invoke (errorreportvalve.java:81) -At Org.apache.catalina.valves.AbstractAccessLogValve.invoke (abstractaccesslogvalve.java:650) toAt Org.apache.catalina.core.StandardEngineValve.invoke (standardenginevalve.java:87) +At Org.apache.catalina.connector.CoyoteAdapter.service (coyoteadapter.java:342) -At Org.apache.coyote.http11.Http11Processor.service (http11processor.java:803) theAt Org.apache.coyote.AbstractProcessorLight.process (abstractprocessorlight.java:66) *At Org.apache.coyote.abstractprotocol$connectionhandler.process (abstractprotocol.java:790) $At Org.apache.tomcat.util.net.nioendpoint$socketprocessor.dorun (nioendpoint.java:1459)Panax NotoginsengAt Org.apache.tomcat.util.net.SocketProcessorBase.run (socketprocessorbase.java:49) - At Java.util.concurrent.ThreadPoolExecutor.runWorker (Unknown Source) the At Java.util.concurrent.threadpoolexecutor$worker.run (Unknown Source) +At Org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run (taskthread.java:61) AAt Java.lang.Thread.run (Unknown Source)

Workaround:

Add annotations before parameter Mutipartfile @requestparam

... @RequestMapping (value= "/fileupload", method=requestmethod.post)      Public Modelandview fileUpload (@RequestParam multipartfile file,httpservletrequest req) {        = Req.getsession (). Getservletcontext (). Getrealpath ("Upload");         = file.getoriginalfilename ();         New File (path,filename); ..

cause of the problem:

It is possible that the direct incoming mutipartfile parameter spring will not be able to automatically map the uploaded file into the parameter, so you need to use the @requestparam designation to map the uploaded file to the parameter.

Spring uses Mutipartfile to upload file error "Failed to instantiate [Org.springframework.web.multipart.MultipartFile]"