error: "Stream closed"; interceptor logs request-body content; CachedOutputStream

[Charlie Read]

See code below.  This logic _works_ in that it does extract the
request-body.
The problem is that further downstream the marshaling phase fails with this
message:  "Stream closed".

I have modeled my code after the standard LoggingInterceptor from CXF.
Can anyone explain why the marshaling phase is getting a closed stream,
and how to resolve that error?

Thanks!
Charlie

    private String extractRequestBody(Message message, HttpServletRequest
request)
            throws WebApplicationException {

        log.info("Inside TraceApiCall.extractRequestBody");
        String requestBody = null;
        if (request.getContentLength() > 0) {
            log.info("Inside TraceApiCall.extractRequestBody: body is
non-empty");
            try {
                InputStream is = request.getInputStream();
                if (is != null) {
                    log.info("Inside TraceApiCall.extractRequestBody:
processing input stream");
                    CachedOutputStream cos = new CachedOutputStream();
                    IOUtils.copy(is, cos);
                    cos.flush();
                    is.close();
                    message.setContent(InputStream.class,
cos.getInputStream());

                    byte[] b = cos.getBytes();
                    if (b != null) {
                        requestBody = new String(b, 0, b.length);
                    }
                    cos.close();
                }
            } catch (IOException ioe) {
                throw new WebApplicationException(ioe);
            }
        }
        return requestBody;
    }

    public TraceApiCall() {
        super(Phase.RECEIVE);
    }

    public void handleMessage(Message message) throws Fault {
        log.info("Inside TraceApiCall.handleMessage");
        HttpServletRequest request = (HttpServletRequest)
message.get(AbstractHTTPDestination.HTTP_REQUEST);
        log.info("TraceApiCall.handleMessage; request: " +
ServiceUtils.prettyPrintRequest(request));
        String requestBody = extractRequestBody(message, request);
        ....
    }