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    DSReponse Failure status

    I have an issue while DSResponse setStatus is Failure, i don't know, how this one is behave with response to client. Client side i didn't get any repsone from server. Any one can please tel what is wrong in this.

    Server Side code:-
    ----------------
    public DSResponse execute(DSRequest dsRequest) throws Exception {
    System.out.println("Kudos **** server : execute.");
    String errorContent ="errorMessage";
    DSResponse dsResponse = new DSResponse(this);
    ISCFileItem item = null;
    String fileExtension = null;
    item = dsRequest.getUploadedFile("fileContent");
    fileData = item.get();
    strFileContent = new String(fileData);
    String fileName = item.getFileName();

    try{
    System.out.println("File Name :- "+ fileName);
    fileExtension = fileName.substring(fileName.lastIndexOf("."),fileName.length());}
    catch(Exception e)
    {
    //dsResponse.setData(getSecurityMap(errorContent));
    //dsResponse.setFailure("Incorrect File format :\""+fileExtension+"\" \nNote:- \nOnly below file formats are allow to upload :- \n-.csv\n-.txt");
    dsResponse.setStatus(DSResponse.STATUS_FAILURE);
    dsResponse.setData(dsRequest.getOldValues()));
    }

    boolean isValidFormat = isValidFileFormat(fileExtension);

    System.out.println("**************File Content Info************");
    System.out.println("File FileName :- "+fileName);
    System.out.println("File Extension :- "+fileExtension);
    System.out.println("File Size :- "+((String.format("%.2f",(float)item.getSize()/1024)))+" KB");
    System.out.println("Is Valid Format:-"+isValidFormat);
    System.out.println("*******************************************");

    if(isValidFormat)
    {
    dsResponse.setData(getSecurityMap(strFileContent));
    System.out.println("File content $$["+strFileContent+"]");
    }
    else
    {
    //dsResponse.setData(getSecurityMap(errorContent));
    //dsResponse.setFailure("Incorrect File format :\""+fileExtension+"\" \nNote:- \nOnly below file formats allow to upload :- \n-.csv\n-.txt");
    dsResponse.setStatus(DSResponse.STATUS_FAILURE);
    dsResponse.setData(dsRequest.getOldValues());

    }
    return dsResponse;
    }

    private boolean isValidFileFormat(String extension)
    {
    if( extension.equalsIgnoreCase(".txt") || extension.equalsIgnoreCase(".csv"))
    {
    return true;
    }
    return false;
    }

    ***********************************************
    Client Side Code
    ----------------

    DynamicForm fileUploadForm = new fileUploadForm ();
    //This item is added into dynamic form.
    FileItem uploadfile = new FileItem("fileContent");


    //Try to execute() the server side method and get back the response.
    fileUploadForm.saveData(new DSCallback() {

    public void execute(DSResponse dsResponse, Object data, DSRequest dsRequest) {
    System.out.println("Response received from server");
    }
    });
    ***********************************************
    IDE Console
    -----------

    Kudos **** server : execute.
    File Name :- Sample.java
    **************File Content Info************
    File FileName :- Sample.java
    File Extension :- .java
    File Size :- 45.75 KB
    Is Valid Format:-false
    *******************************************
    === 2014-07-30 10:20:17,592 [2-29] INFO DSResponse - [builtinApplication.fileUpload_add] DSResponse: Map with 0 keys
    === 2014-07-30 10:20:17,593 [2-29] DEBUG RPCManager - Content type for RPC transaction: text/html; charset=UTF-8
    === 2014-07-30 10:20:17,593 [2-29] DEBUG RPCManager - non-DMI response, dropExtraFields: false
    === 2014-07-30 10:20:17,775 [2-26] INFO RequestContext - URL: '/Test/sc/skins/Enterprise/images/Dialog/warn.png', User-Agent: 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0': Moz (Gecko) with Accept-Encoding header
    === 2014-07-30 10:20:17,807 [2-26] INFO Download - done streaming: G:/Test/war/Test/sc/skins/Enterprise/images/Dialog/warn.png

    ******************End*****************************
    Client browser while upload invalid file , if using dsResponse.setFailure("errormessage") this logic is shows custom error message i'm getting warn popup, but no response in client side. For reference see above IDE Console.
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