HTTPURLConnection on HP Unix

[suchitralingaraj]

Hi All,
I am passing an XML String through HTTPURLConnection to the server which is an HP Unix machine. First time request and response goes through. For the second time when i access the server outputstream is posing a problem. A null pointer exception is thrown and the passed XML string length is zero.
Immediate response will be greatly appreciated.
Here is the code snippet.
try
{
URL url = new URL(url_resource);
con = (HttpURLConnection) url.openConnection();
con.setUseCaches( false );
con.setDoOutput(true);
con.setDoInput(true);
con.setRequestMethod("POST");
con.setRequestProperty( "Content-Length", String.valueOf( xml_string.length() ) );
con.setRequestProperty( "Content-Type", "multi-part/form-data");
}
catch(Exception exc)
{
String s = exc.getMessage();
}
try
{
// Write out the XML Contents
PrintWriter out = new PrintWriter(new OutputStreamWriter(con.getOutputStream() ));
out.println(xml_buff.toString());
out.close();
}
catch(Exception exc1)
{
String s = exc1.getMessage();
}
After this When I try to read the message from the input stream NullPointerException is thrown and the message is as "Did not meet stated content length of OutputStream: you wrote 0 bytes and I was expecting you to write exactly 252 bytes!!!"
Regards

[Ernest Friedman-Hill]

Hi,
We don't have many rules around these parts, but we do have our naming policy, which requires that you use both a first and last name. Please head over here and fix yours, pronto! Thanks, pardner, and see you around the Ranch!

[Han You]

I can't figure out what's wrong with your code, but one thing I can suggest is to use a BufferedWriter instead of a PrintWriter. The reason for this is the PrintWriter class doesn't throw any exceptions. What this means is that all exceptions that occur while using the PrintWriter are never revealed to the surrounding java code.
~P.S. if you DO decide to use a BufferedWriter, don't forget to .flush()!