Warning "[Parameters] Parameters : Invalid chunk ignored" when posting from a managed bean

Question

I am opening a HttpURLConnection from within a managed bean to post to an external service. When I make the call to HttpUrlConnection.getInputStream() I am getting the following warning:

WARN [Parameters] Parameters : Invalid chunk ignored

Everything processes just fine, but I'd like to keep a bunch of those warnings out of our logs. What is causing this warning and how might I stop it from occurring?

Here is the relevant code:

@ManagedBean
@SessionScoped
public class MyController {

  private void doStuff() {
    ...
    URL url = new URL(externalServiceUrl);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setDoOutput(true);
    conn.setDoInput(true);

    wr = new OutputStreamWriter(conn.getOutputStream());
    wr.write(postData);
    wr.flush();

    InputStream is = conn.getInputStream(); // Warning logged after this line
    ...
  }

}

Answer 1

This warning can occur whenever the query string contains an invalid chunk, such as a request parameter without a name:

name1=value1&=value2&name3=value3

or in your particular case, a & in the beginning (essentially, the first chunk is invalid):

&name1=value1&name2=value2&name3=value3

As per the comments, you seem to be HTTP-connecting to a service which runs on the same container and logs to the same logfile. This warning is actually coming from the service container itself, not from HttpURLConnection.