Apache HttpClient making multipart POST to Spring @Controller class

Question

It seems like there are several posts such as here asking how to use Apache Commons HTTPClient libraries in Java to do a POST to a Servlet. However, it seems like I'm having some problems doing the same thing with a annotated Spring controller method. I've tried a few things but gotten HTTP 401 Bad Request responses from the server. Any examples of doing this would be greatly appreciated.

EDIT: Code I am trying to use:

//Server Side (Java)
@RequestMapping(value = "/create", method = RequestMethod.POST)
public void createDocument(@RequestParam("userId") String userId,
                           @RequestParam("file") MultipartFile file, HttpServletResponse response) {
    // Do some stuff                            
}

//Client Side (Groovy)
    void processJob(InputStream stream, String remoteAddress) {
    HttpClient httpclient = new DefaultHttpClient()
    httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1)
    HttpPost httppost = new HttpPost("http://someurl/rest/create")

    MultipartEntity mpEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE)
    InputStreamBody uploadFilePart = new InputStreamBody(stream, 'application/octet-stream', 'test.file')
    mpEntity.addPart('file', uploadFilePart)
    mpEntity.addPart('userId', new StringBody('testUser'))
    httppost.setEntity(mpEntity)

    HttpResponse response = httpclient.execute(httppost);
    println(response.statusLine)
}

Still getting 400 Bad Request in the response from the server.

Answer 1

I hate to answer my own question when it shows incompetence, but it turns out the code was fine, this particular controller did not have a CommonsMultipartResolver defined in its servlet-context.xml file (multiple DispatcherServlets...long story :()

Here's what I added to make it work:

<!-- ========================= Resolver DEFINITIONS ========================= -->
<bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    <!-- one of the properties available; the maximum file size in bytes -->
    <property name="maxUploadSize" value="50000000"/>
</bean>