Name: jn10789 Date: 01/20/99


try {
// hostaddress is correct, but a connection may or not exist.
// if the 1st time a connection doesn't exist, it will NOT
// succeed subsequent times. Exiting the app and retrying will
// succeed.

// Socket will call InetAddress.getHostAddress(hostAddress)
   _echo = new Socket(hostaddress, port);
   _os = new PrintStream(_echo.getOutputStream());
   _is = new BufferedReader(new InputStreamReader(_echo.getInputStream()));
} catch (IOException e) { err = e.toString(); }

This seems like #406537, which is supposed to fix this.
I'm not sure this has anything to do with InetAddressCachePolicy,
which is not doumented.

Specifically, I wrote a native app that needs to run "dial-up networking"
in 95/98 (which I wrote in C++) and after connecting, to do a ftp.
This succeeds perfectly if the connecting exists.
If new Socket(address, port) fails because the connection hadn't
yet succeeded, it never recovers.
(Review ID: 52440)
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Name: rmT116609 Date: 11/17/2000


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)


I want to remember you for bug id #4204351.
JDK 1.3 didn't fixed the bug. If java.net.InetAddress looks up for a host, and
there is no internet connection, an UnknownHostException is thrown. That's ok,
but if the network is available on a later try, InetAddress also throws the
exception.

Example code:

--------------------------------------------------------------------------------

import java.io.*;
import java.net.*;

/**
* Example for bug in cache of java.net.InetAddress.
* Tested with JDK 1.3 running on WindowsME.
*
* @author Joerg Wassmer, ###@###.###
*/
public class BugExample4204351
{

   public static void main(String[] args) throws IOException
   {
      System.out.println(
         "Please DISCONNECT from internet now and press a key."
      );
      System.in.read();
      System.in.skip(System.in.available());
      System.out.println("Resolving host: www.yahoo.com...");
      try {
         InetAddress.getByName("www.yahoo.com");
         System.out.println(
            "You were connected to internet. Please restart."
         );
         return;
      } catch (IOException ex) {
        System.out.println("Host not found like expected.");
      }
      System.out.println("Please CONNECT to internet now and press a key.");
      System.in.read();
      System.out.println("Resolving host: www.yahoo.com...");
      try {
         InetAddress.getByName("www.yahoo.com");
         System.out.println("Host found - cache of InetAddress ok.");
      } catch (IOException ex) {
         System.out.println(
            "Host not found - cache of InetAddress has a bug or you were offline."
         );
      }

   }

}

--------------------------------------------------------------------------------
(Review ID: 112402)
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