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POSending Multipart File as POST parameters with RestTemplate requests
 

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    <p>I am working with Spring 3 and RestTemplate. I have basically, two applications and one of them have to post values to the other app. through rest template. </p> <p>When the values to post are Strings, it's work perfect, but when i have to post mixed and complex params (like MultipartFiles) i get an converter exception.</p> <p>As example, i have this:</p> <p>App1 - <strong>PostController:</strong></p> <pre><code>@RequestMapping(method = RequestMethod.POST) public String processSubmit(@ModelAttribute UploadDTO pUploadDTO, BindingResult pResult) throws URISyntaxException, IOException { URI uri = new URI("http://localhost:8080/app2/file/receiver"); MultiValueMap&lt;String, Object&gt; mvm = new LinkedMultiValueMap&lt;String, Object&gt;(); mvm.add("param1", "TestParameter"); mvm.add("file", pUploadDTO.getFile()); // MultipartFile Map result = restTemplate.postForObject(uri, mvm, Map.class); return "redirect:postupload"; } </code></pre> <p>On the other side... i have another web application (App2) that receives the parameters from the App1.</p> <p>App2 - <strong>ReceiverController</strong></p> <pre><code>@RequestMapping(value = "/receiver", method = { RequestMethod.POST }) public String processUploadFile( @RequestParam(value = "param1") String param1, @RequestParam(value = "file") MultipartFile file) { if (file == null) { System.out.println("Shit!... is null"); } else { System.out.println("Yes!... work done!"); } return "redirect:postupload"; } </code></pre> <p>My application-context.xml:</p> <pre><code>&lt;bean id="restTemplate" class="org.springframework.web.client.RestTemplate"&gt; &lt;property name="messageConverters"&gt; &lt;list&gt; &lt;bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" /&gt; &lt;bean class="org.springframework.http.converter.FormHttpMessageConverter" /&gt; &lt;bean class="org.springframework.http.converter.StringHttpMessageConverter" /&gt; &lt;bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter" /&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"&gt; &lt;property name="maxUploadSize"&gt; &lt;value&gt;104857600&lt;/value&gt; &lt;/property&gt; &lt;property name="maxInMemorySize"&gt; &lt;value&gt;4096&lt;/value&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>Here is the stack of the exception that i am getting when i do the postForObject of the RestTemplate...</p> <pre><code>org.springframework.http.converter.HttpMessageNotWritableException: Could not write request: no suitable HttpMessageConverter found for request type [org.springframework.web.multipart.commons.CommonsMultipartFile] at org.springframework.http.converter.FormHttpMessageConverter.writePart(FormHttpMessageConverter.java:292) at org.springframework.http.converter.FormHttpMessageConverter.writeParts(FormHttpMessageConverter.java:252) at org.springframework.http.converter.FormHttpMessageConverter.writeMultipart(FormHttpMessageConverter.java:242) at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:194) at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:1) at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:588) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:436) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:415) at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:294) at com.yoostar.admintool.web.UploadTestController.create(UploadTestController.java:86) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:421) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:409) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:774) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 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:619) </code></pre> <p>So my questions are:</p> <ol> <li>Is it possible to send MultipartFile through RestTemplate using POST?</li> <li>Are there some specific converters that I have to use to send this type of objects? I mean is there some <strong><em>MultipartFileHttpMessageConverter</em></strong> to use in my configuration?</li> </ol>
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