Spring MVC File Upload null multipart data

Question

I want to upload an image file to one location in my computer with Spring MVC. But when I chose the file I am getting NullPointerException error. Here is my codes;

@RequestMapping("/save-product")
public void saveFile(HttpServletRequest servletRequest,
        @ModelAttribute("uploadedFile") UploadedFile uploadedFile,
        BindingResult bindingResult, Model model) {

    MultipartFile multipartFile = uploadedFile.getMultipartFile();
    String fileName = multipartFile.getOriginalFilename();
    try {
        File file = new File(servletRequest.getServletContext().getRealPath("/home/mesud/springupload/"), fileName);
        multipartFile.transferTo(file);
    } catch (IOException e) {
        e.printStackTrace();
    }
}


<sf:form enctype="multipart/form-data" modelAttribute="uploadedFile">
                <fieldset >
                 <legend>Resim Yükle</legend>
                 <div id='progressBar'
                    style='height: 20px; border: 2px solid green; margin-bottom: 20px'>
                    <div id='bar' style='height: 100%; background: #33dd33; width: 0%'>
                    </div>
                </div>
                <input type="file" id=profilResim value="Profil Resmi" style="margin-bottom: 20px"/><br/>
              </fieldset>
</sf:form>

I am uploading file in onSelect function in Javascript. Here is my javascript method;

function uploadNext() {
        var xhr = new XMLHttpRequest();
        var fd = new FormData();
        var file = document.getElementById('profilResim').files[filesUploaded];
        fd.append("multipartFile", file);
        xhr.upload.addEventListener("progress", onUploadProgress, false);
        xhr.addEventListener("load", onUploadComplete, false);
        xhr.addEventListener("error", onUploadFailed, false);
        xhr.open("POST", "save-product");
        debug('uploading ' + file.name);
        xhr.send(fd);
    }

In my Applicaiton Initializer class I use this method for multipart requests;

@Override
protected void customizeRegistration(Dynamic registration) {
    registration.addMapping("/");
    registration.setMultipartConfig(new   MultipartConfigElement("/home/mesud/springtemp",2097152, 4194304, 0));
}

Why my UploadedFile object (this object is includes a MultipartFile object) is posted null?

Saurabh Chaturvedi · Accepted Answer · 2016-06-26 12:05:32Z

1

There could be several reasons . Do some checks like have you defined CommonsMultiPartResolver bean in your application-context.xml file . If not define it . Also check your jars . Ensure you have commons-fileupload jar and commons-io jar . Let me know if that helped you.

answered Jun 26, 2016 at 12:05

Saurabh Chaturvedi

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7 Comments

emreturka Over a year ago

I have controlled these. I have defined CommonsMultipartResolver in my xml and I have commons-fileupload and commons-io.But again the same error :-(

Saurabh Chaturvedi Over a year ago

Can you edit your question and paste your XML file contents ?

emreturka Over a year ago

I use annotation based settings. So I updated the question

Saurabh Chaturvedi Over a year ago

I think your multipartconfig is messed it should not necessarily be defined in initializer file and it should be bean annotated , try something like this. @Bean(name = "multipartResolver") public CommonsMultipartResolver createMultipartResolver() { CommonsMultipartResolver resolver=new CommonsMultipartResolver(); resolver.setDefaultEncoding("utf-8"); return resolver; }

Saurabh Chaturvedi Over a year ago

It's better you use XML based settings first , and when you understand them, implement non-xml settings.

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