Jersey file upload ContentDisposition getSize

if you are using Jersey for file upload and using "@FormDataParam("file") InputStream file" to receive the file and  "@FormDataParam("file") FormDataContentDisposition fileDetail" to receive filemetadata then you will run into and issue where fileDetails.getSize() is coming as -1.  This will only get populated if the "size" header is passed in  multipart request. For me FF was not sending when I was uploading file.

The only way I could make it work was to add a TeeInputStream and calculate the length.  I wrote a class

    private static class OutputStreamSizeCalculator extends OutputStream {
        private long length;

        @Override
        public void write(int b) throws IOException {
            length++;
        }

        public long getLength() {
            return length;
        }
    }

and then wrapped my InputStream around it
        OutputStreamSizeCalculator out = new OutputStreamSizeCalculator();
        TeeInputStream tee = new TeeInputStream(in, out, true);
...pass tee to the underlying methods and then call

        long length = out.getLength();