Copy Web service not working in SharePoint 2010

I am trying to upload documents to SharePoint using Copy.copyIntoItems web service. Please find my code below.

    String userName = "*******";
    String password = "********";

    Copy service = new Copy();
    port = service.getCopySoap();

    BindingProvider bp = (BindingProvider) port;

    bp.getRequestContext().put(BindingProvider.USERNAME_PROPERTY, userName);
    bp.getRequestContext().put(BindingProvider.PASSWORD_PROPERTY, password);

    String destURL = "http://sharepoint.com/Shared Documents/test.txt";
    DestinationUrlCollection destUrlCollection = new DestinationUrlCollection();
    destUrlCollection.getString().add(destURL);

    Holder<Long> longHolder = new Holder<Long>(new Long(-1));
    CopyResultCollection results = new CopyResultCollection ();
    Holder<CopyResultCollection> resultHolder = new Holder<CopyResultCollection>(results);

    File file = new File("C:\\test.txt");
    int size = (int) file.length();

    byte[] content = new byte[size];
    DataInputStream dis = new DataInputStream(new FileInputStream(file));
    int read = 0;
    int numRead = 0;
    while (read < content.length && (numRead = dis.read(content, read,
            content.length - read)) >= 0) {
        read = read + numRead;
    }
    FieldInformationCollection fieldInformationCollection = new FieldInformationCollection() ;

    port.copyIntoItems(file.getName(), destUrlCollection,fieldInformationCollection, content,longHolder, resultHolder);

Code works fine on the site that allows anonymous access. But fails on the site that doesn't allow anonymous access. I also tried setting the Authenticator.setDefault. But no use. Problem is, I don't get any error messages on the screen. But the document is not getting loaded to sharepoint.

Any help will be appreciated.

Got my problem. problme is: eventhough i have provided credentials in my java program, the program is taking the credentials with which I am logged into my computer, which makes the program to fail. Any idea as how to fix this issue?