I am getting server error 500 when trying to upload a file

Question

I am trying to upload a file using

Upload upload = uploadService.uploadFile(fileName, fileStream, fileType, description);

 

This is the post body 

--146bdc89009

Content-Disposition: form-data; name="temp2566689044278828576s.png"; filename="temp2566689044278828576s.png"

Content-Type: image/png

Content-Transfer-Encoding: binary

 

����C ..

--146bdc89009

Content-Disposition: form-data; name="name"

Content-Type: text/plain; charset=UTF-8

 

temp2566689044278828576s.png

--146bdc89009

Content-Disposition: form-data; name="type"

Content-Type: text/plain; charset=UTF-8

 

IMAGE

--146bdc89009

Content-Disposition: form-data; name="description"

Content-Type: text/plain; charset=UTF-8

 

wqewer

--146bdc89009--

 

And this is a partial list of  the header  parameters

timeStamp=[2014-06-21T09:36:13.164Z]

User-Agent=[Profile/MIDP-1.0 Confirguration/CLDC-1.0]

SDKName=[J2ME]

Content-Type=[multipart/form-data;boundary=**********]

Accept=[application/json]

signature=[Bgr70TrE9D3tHMFBwdbJIeMj6QA=]

apiKey=[4d1dbd8dbbeee0b9f10e654b426686ecabb6ec09206fc18d6d05b22880919c44]

version=[1.0]

 

 

I keep getting Error 500, internal server error. What is the problem.

 

 

Answer 1

Hi James,

Can you put complete snippet of your code.? Also, is it coming for specific type of files or are you getting for all files?

Comments

I am using only images and i have gotten for files of different sizes.  Code snippets
1. private String saveDataElement(HashMap data, String elementType){
   
    String response ="http://www.testing.com/url";
    if (elementType.equalsIgnoreCase(UploadFileType.IMAGE) ||
            elementType.equalsIgnoreCase(UploadFileType.VIDEO)) {
        //dataelement is a file to be uploaded
        String file = data.get("propertyValue").toString();
        String fileName = file.substring(file.lastIndexOf("/")+1);
        response = App42ServiceHandler.instance().uploadFile(
                fileName,
                file,
                elementType,
                data.get("propertyName").toString());
    }
       
    return response;
}

2. In App42ServiceHandler
    public String uploadFile(String fileName, String filePath, String fileType, String description){
        App42Log.setDebug(true);
        App42Log.debug("upload file "+filePath );
        InputStream fileStream;
        try {
            fileStream = FileSystemStorage.getInstance().openInputStream(filePath);
        }catch(Exception e){
            //failed to open file
            App42Log.debug(e.getMessage());   
            return "";
        }
        try {
            Upload upload = uploadService.uploadFile(fileName, fileStream, fileType, description);
            return ((File) upload.getFileList().elementAt(0)).getUrl();
        }catch (Exception e){
            //some error
            App42Log.debug(e.getMessage());
            return "";
        }
       

    }

3. I have ported the J2ME client to work with codenameone and i use the codenameone multipartrequest to send the file to App42 as in here

    /**
     * Multipart request for all the methods
     *
     * @param name
     * @param file
     * @param queryParams
     * @param postParams
     * @param urlPost
     * @param accept
     *
     * @return string
     *
     * @throws Exception
     *
     */
    public static String multiPartRequest(String name,
            InputStream fileInputStream, String fileName,
            Hashtable queryParams, Hashtable postParams,
            Hashtable headerParams, String urlPost, String accept)
            throws Exception {

        MultipartRequest conn = null;
        DataOutputStream dos = null;
        DataInputStream inStream = null;
        String boundary = "**********";

        int bytesRead, bytesAvailable, bufferSize;

        byte[] buffer;

        int maxBufferSize = 1 * 1024 * 1024;
        urlPost = net.oauth.jme.Util.replace(urlPost, " ", "%20");

        StringBuffer queryString = new StringBuffer("?");
        String apiKey = (String) queryParams.get("apiKey");
        String signature = (String) queryParams.get("signature");
        String timeStamp = (String) queryParams.get("timeStamp");
        String sessionId = (String) queryParams.get("sessionId");
        String adminKey = (String) queryParams.get("adminKey");
        queryParams.remove("apiKey");
        queryParams.remove("signature");
        queryParams.remove("timeStamp");
        queryParams.remove("sessionId");
        queryParams.remove("adminKey");
        // Get all Request parameter and set here
        Enumeration enumKeys = queryParams.keys();
        while (enumKeys.hasMoreElements()) {
            String key = (String) enumKeys.nextElement();
            String value = (String) queryParams.get(key);
            queryString.append(URLEncoder.encode(key) + "="
                    + URLEncoder.encode(value) + "&");
        }

        String urlString = urlPost + queryString;
        String str=null;
        String mimeType = MimeTypes.getInstance().getMimeType(fileName);    

        try {
            // ------------------ CLIENT REQUEST

            // FileInputStream fileInputStream = new FileInputStream(file);

            // open a URL connection to the Servlet
            App42Log.debug(" Upload URL is " + urlString);

            // Open a HTTP connection to the URL

            conn = new MultipartRequest();
            conn.setPost(true);
           
            // Use a post method.

            conn.addRequestHeader("Accept", "application/json");

            Enumeration enumKeysHeader = headerParams.keys();
            while (enumKeysHeader.hasMoreElements()) {
                String key = (String) enumKeysHeader.nextElement();
                String value = (String) headerParams.get(key);
                conn.addRequestHeader(key, value);
            }
            conn.addRequestHeader("User-Agent",
                    "Profile/MIDP-1.0 Confirguration/CLDC-1.0");
            // conn.setRequestProperty("Connection", "Keep-Alive");

            conn.addRequestHeader("Content-Type",
                    "multipart/form-data;boundary=" + boundary);
            // conn.setRequestProperty("Content-Type",
            // "application/octet-stream");

                conn.setUrl(urlString);

                            //add the data image

                conn.setPriority(ConnectionRequest.PRIORITY_CRITICAL);


            // read file and write it into form...
            conn.addData(fileName, fileInputStream,FileSystemStorage.getInstance().getLength(fileName)  ,mimeType);    
            conn.setFilename(name, fileName);

            // Put Parameter here


            Enumeration keysParam = postParams.keys();
            int i = 0;
            while (keysParam.hasMoreElements()) {
                i++;
                String key = (String) keysParam.nextElement();
                String value = (String) postParams.get(key);
                conn.addArgument(key,value);

                App42Log.debug(" Setting Param  :" + key + " : " + value);
            }

            NetworkManager.getInstance().addToQueueAndWait(conn);

            // ------------------ read the SERVER RESPONSE
            StringBuffer responseMessage = new StringBuffer();
            responseMessage.append(conn.getResponseData());

            if (conn.getResponseCode() != 200) {

                str = responseMessage.toString();
                // Do Exception Handling for App42
                JSONObject jsonObj = new JSONObject(str);
                int httpErrorCode = Integer.valueOf(
                        jsonObj.getJSONObject("app42Fault").getString(
                                "httpErrorCode")).intValue();
                int appErrorCode = Integer.valueOf(
                        jsonObj.getJSONObject("app42Fault").getString(
                                "appErrorCode")).intValue();

                if (httpErrorCode == 404) {
                    throw new App42NotFoundException(str, httpErrorCode,
                            appErrorCode);
                } else if (httpErrorCode == 400) {
                    throw new App42BadParameterException(str, httpErrorCode,
                            appErrorCode);
                } else if (httpErrorCode == 401) {
                    throw new App42SecurityException(str, httpErrorCode,
                            appErrorCode);
                } else if (httpErrorCode == 413) {
                    throw new App42LimitException(str, httpErrorCode, 1413);
                } else if (httpErrorCode == 500) {
                    throw new App42Exception(str, httpErrorCode, appErrorCode);
                } else {
                    throw new App42Exception(
                            "We are sorry something has gone wrong on our side",
                            500, 1500);
                }

            }

        } catch (Exception ex) {
            App42Log.debug("From ServletCom CLIENT REQUEST:" + ex);
            throw ex;
        } finally {
            fileInputStream.close();

            dos.close();
            //conn.close();
        }

        return str;

    }

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I will check this code, make sure you done have any null value method call like filename, stream etc.

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Hi James,

Kindly find the sample link below for upload file in J2ME and let me know if it will work.
https://github.com/NareshDShephertz/App42_J2meFile_Upload
Thanks.