FULL PRODUCT VERSION :
java version "1.6.0_22"


ADDITIONAL OS VERSION INFORMATION :
This appears on:
Ubuntu Linux
Windows 2003 32bit and 64bit
Windows 2008 64bit
Mac

EXTRA RELEVANT SYSTEM CONFIGURATION :
Configuration is not relavant it appears when upgrading any of OS to build 22

A DESCRIPTION OF THE PROBLEM :
When doing a HTTP Post via the HttpURLConnection

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
                    URL url = new URL("http://httpserver/uploadhandler");

                    HttpURLConnection urlConn = (HttpURLConnection)url.openConnection();

                    urlConn.setDoInput(true);

                    urlConn.setDoOutput(true);

                    urlConn.setUseCaches(false);

                    // Setup the Headers
                    urlConn.setRequestMethod("POST");
                    urlConn.setRequestProperty("Connection", "Keep-Alive");
                    urlConn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary + "; charset=UTF-8");
                    urlConn.setRequestProperty("Transfer-Encoding", "chunked" );
                    urlConn.setRequestProperty("User-Agent", "Test Agent" );
                    urlConn.setRequestProperty("Content-Length", Long.toString(contentLength));
                    urlConn.setChunkedStreamingMode(0);
                    urlConn.setReadTimeout(READ_TIMEOUT);
                    urlConn.setConnectTimeout(READ_TIMEOUT);

                    urlConn.connect();

                    DataOutputStream printout = new DataOutputStream (urlConn.getOutputStream());

                    // Write boundary and header
                    printout.writeBytes(contentBoundary);
                    printout.write(headerStr.getBytes("UTF-8"));

                    // write upload buffer
                    if (bytesRead != -1) {
                        printout.write(buffer, 0, bytesRead);
                    }

                    // Send the footer
                    printout.writeBytes(lineEnd);
                    printout.writeBytes(endingBoundary);

Using the above code in any version previous to build 22 the result shows a Content-Length header in the HTTP Request when inspected through wireshark.

Wireshark output with missing header:


POST /uploadhandler HTTP/1.1
Content-Type: multipart/form-data; boundary=***********vdvuiBIOG&#(RO#$Bkjdbvsdbebr
User-Agent: Test Agent
Cache-Control: no-cache
Pragma: no-cache
Host: httpserver
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
Transfer-Encoding: chunked


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The Content-Length as provided by the HttpURLConnection.setRequestProperty should be evident in the request to the HTTP server when doing a post.
ACTUAL -
All headers provided by the setRequestProperty are sent correctly except the Content-Length which appears to be stripped out.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
No Error except from the server and wireshark capture not showing the content-length header.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
                    URL url = new URL("http://httpserver/uploadhandler");

                    HttpURLConnection urlConn = (HttpURLConnection)url.openConnection();

                    urlConn.setDoInput(true);

                    urlConn.setDoOutput(true);

                    urlConn.setUseCaches(false);

                    // Setup the Headers
                    urlConn.setRequestMethod("POST");
                    urlConn.setRequestProperty("Connection", "Keep-Alive");
                    urlConn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary + "; charset=UTF-8");
                    urlConn.setRequestProperty("Transfer-Encoding", "chunked" );
                    urlConn.setRequestProperty("User-Agent", "Test Agent" );
                    urlConn.setRequestProperty("Content-Length", Long.toString(contentLength));
                    urlConn.setChunkedStreamingMode(0);
                    urlConn.setReadTimeout(READ_TIMEOUT);
                    urlConn.setConnectTimeout(READ_TIMEOUT);

                    urlConn.connect();

                    DataOutputStream printout = new DataOutputStream (urlConn.getOutputStream());

                    // Write boundary and header
                    printout.writeBytes(contentBoundary);
                    printout.write(headerStr.getBytes("UTF-8"));

                    // write upload buffer
                    if (bytesRead != -1) {
                        printout.write(buffer, 0, bytesRead);
                    }

                    // Send the footer
                    printout.writeBytes(lineEnd);
                    printout.writeBytes(endingBoundary);

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Unknown