ocr in image processing

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Java

lass ttt
{
    static String str;
    static BufferedImage image;
    public static void main(String[] args) throws IOException, TesseractException {
        File imageFile = new File("1.png");
        Tesseract instance = Tesseract.getInstance();
        instance.setDatapath("C:/Program Files (x86)/Java");
        String result = instance.doOCR(imageFile);
        System.out.println("string is"+result);
    }
}

i have doen this task but problem is that in in result variable text is not present .i do not know what i wrong please tell me when i wrong.
please give me any suggestion i want to program for text extraction from image and give me any other api or give me any sample code example in java.
thanks in advance