Size of the file is changing after upload in spring

Question

I am trying to upload an apk file in my local spring java web application, but the size of the file is getting changed after its uploaded as a result of which checksum is failing.

basically the size of the file on disk is different than the size of the file I receive in my application.

I am completely clueless, I am not sure how to go on debugging this.

PS: the temp file(tmp folder) which gets created during uploading has increased size than the one I originally upload.

code :

@RequestMapping(value = "/app", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA)
public Application upload(@RequestParam(value = "apkFile", required=false) MultipartFile apkFile, 
                          @RequestParam(value = "iconFile", required=false) MultipartFile iconFile, 
                          @RequestParam Map<String, String> params, HttpServletRequest request, 
                          Authentication authentication) {
    //process
}

Dependencies I use

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.2</version>
</dependency>

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.5</version>
</dependency>

Html code I use :

Upload File Request Page

    <form method="POST"
        action="http://localhost:8080/devicemanagement_administration/admin/api/v1/application/app"
        enctype="multipart/form-data">
        type(binary,icon or screenshot): <input type="text" name="contentType"><br />
         tenantId(ibm or google): <input type="text" name="tenantId"><br />
        <br /> platform(android or ios): <input type="text" name="platform"><br />
        File to upload: <input type="file" id="apkFile" name="apkFile"><br /> content
        <br /> <input type="submit" value="Upload"> Press here to
        upload the file!
    </form>

</body>
</html>

PS:i tried uploading text and json files, the size doesnt change after uploading.. only most apks are causing issues.

Answer 1

I finally figured out what was the issue,

I had put a logging filter to this application which would alter the request in that logging filter. Removed the part where the request is altered. working fine now.