[jboss-jira] [JBoss JIRA] Commented: (JBREM-690) Once the socket of a callback server timeouts, it starts to silently discard traffic

[ http://jira.jboss.com/jira/browse/JBREM-690?page=comments#action_12351965 ] Ron Sigal commented on JBREM-690: --------------------------------- It seems that when one end of a TCP connection shuts down, it doesn't automatically inform the other side unless there's an ACK or NAK going out anyway. In particular, I think that it's possible for the first socket write() to succeed after the other end disconnects. Example: public class SocketTest { public static void main(String[] args) { new Thread() { public void run() { try { ServerSocket ss = new ServerSocket(2345); Socket s = ss.accept(); InputStream is = s.getInputStream(); System.out.println("read: " + is.read()); s.close(); ss.close(); } catch (IOException e) { System.out.println("server: " + e); } } }.start(); try { Socket s = new Socket("localhost", 2345); OutputStream os = s.getOutputStream(); os.write(3); System.out.println("wrote 3"); os.write(5); System.out.println("wrote 5"); os.write(7); System.out.println("wrote 7"); s.close(); } catch (IOException e) { System.out.println("client: " + e); } } } You might expect os.write(5) to fail, but, in fact, the output (at least in Windows and I think this would be the case in linux as well) is: wrote 3 read: 3 wrote 5 client: java.net.SocketException: Software caused connection abort: socket write error There's no problem for an ordinary invocation because the client waits for a response. For an asynchronous invocation, however, the client may never know that an invocation failed. One workaround is to use the connection checking facility of the socket transport, which does preliminary i/o on a socket to determine if the connection is still working. Alternatively, the application can verify that an intended invocation has succeeded. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira