Why is HttpServletRequest inputstream empty?

Question

I have this code where I read the input from a request input stream and use a JacksonMapper to convert into a POJO. Its running in a jetty 7 container with guice support.

Answer 1

I ended up with the problem when enabling debug logging for org.springframework in a Spring Boot 2.2.1 project, and thus using spring-webmvc 5.2.1.

This is caused by the request logging of the parameter-map, which reads the input stream if the Content-Type is application/x-www-form-urlencoded. I believe this spring issue is related to it.

See the following code which causes the problem.

private void logRequest(HttpServletRequest request) {
    LogFormatUtils.traceDebug(logger, traceOn -> {
        String params;
        if (isEnableLoggingRequestDetails()) {
            params = request.getParameterMap().entrySet().stream()
                    .map(entry -> entry.getKey() + ":" + Arrays.toString(entry.getValue()))
                    .collect(Collectors.joining(", "));
        }
        else {
            params = (request.getParameterMap().isEmpty() ? "" : "masked");
        }
...

source

I ended up reporting an issue and and changing the content-type in the request instead.