Converting image to base64 results in empty image

I am using below code to convert base64 data to png image using java code but it always results in empty image. If i use the same base64 data to image in online services it works fine, below is the code, is there any issue with this code?

byte[] data = Base64.decodeBase64(imageInBase64);
    System.out.println("Writing steam... " + data);
    try (OutputStream stream = new FileOutputStream(new File("c:\\test.png"))) {
        stream.write(data);
    }
    System.out.println("Converted..");