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2 Replies Latest reply: Oct 10, 2012 12:05 AM by gimbal2 RSS

Java 7 - URLConnection > cannot writing to server

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Hi,

We have a distributed system with http messaging: a client with Swing GUI and a servlet on Tomcat 6.
I have problem send http-post message in Java 7.

Here is a test, which works with Java 6 but not with Java 7.

<pre>
public static void main(String[] args) {
URLConnection connection = null;
OutputStream out = null;
InputStream in = null;
ByteArrayInputStream bain = null;
try {
URL url = new URL("http://localhost:8084/app/server");
connection = url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setDefaultUseCaches(false);
connection.setAllowUserInteraction(false);
connection.setUseCaches(false);
connection.setRequestProperty("Content-Type", "application/octet-stream");
out = connection.getOutputStream();
PrintWriter pw = new PrintWriter(out);
pw.print("WHY?");
pw.flush();
pw.close();
in = connection.getInputStream();
byte[] bin = IOUtils.InputStream2ByteArray(in);
System.out.println(((HttpURLConnection)connection).getResponseMessage());
System.out.println(new String(bin));
} catch (Exception ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, ex.getMessage(), ex);
}
}
</pre>

If I compile with Java 7 and run the app, I get a IOException:
<pre>
SEVERE: Error writing to server
java.io.IOException: Error writing to server
     at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:622)
     at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:634)
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1317)
     at fi.jamix.java7tester.App.main(App.java:43)
</pre>

Is there significant change between Java 6 and Java 7 with HttpURLConnection?
I monitoring Tomcat HTTP-requests in Netbeans, and Tomcat does not get the request. The error says, writeRequest fails.
Why? Any suggestion to find the reason?

Edited by: belaborbely on 7.10.2012 16:39

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