Name: nt126004 Date: 07/25/2002


FULL PRODUCT VERSION :
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-beta-b14)
Java HotSpot(TM) Client VM (build 1.4.1-beta-b14, mixed mode)

FULL OPERATING SYSTEM VERSION :
Windows NT Version 4.0

A DESCRIPTION OF THE PROBLEM :
It is unclear from the documentation of Socket whether
getInetAddress should return null if a socket is closed.
Presumably closed implies "not connected"--which means null
should be returned--but that is not obvious.

With Java 1.4.0, getInetAddress() never returns null. But
with Java 1.4.1-beta, getInetAddress() returns null if the
socket was created from a channel and then closed; it does
not return null if the socket was created with the old
host/port constructor and then closed. This could be
considered a bug or just a documentation issue.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the included source code with Java 1.4.0 and 1.4.1-beta
and look at the output. You will need a working network
connection to establish the sockets.

EXPECTED VERSUS ACTUAL BEHAVIOR :
In the example below, I run the test with Java 1.4.1-beta
and 1.4.0. It's not clear whether null should be printed in
the "Channel socket address" line.

% java141 -version
java version "1.4.1-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build
1.4.1-beta-b14)
Java HotSpot(TM) Client VM (build 1.4.1-beta-b14, mixed mode)
% java141 UnboundSocketInetAddress
Simple socket address: www.limewire.com/64.61.25.138
Simple channel address: www.limewire.com/64.61.25.138
Channel socket address: www.limewire.com/64.61.25.138
Channel socket address: null

% java140 -version
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build
1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)
% java140 UnboundSocketInetAddress
Simple socket address: www.limewire.com/64.61.25.138
Simple channel address: www.limewire.com/64.61.25.138
Channel socket address: www.limewire.com/64.61.25.138
Channel socket address: www.limewire.com/64.61.25.138

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.io.*;
import java.net.*;
import java.nio.channels.*;

/**
 * Tries to figure out under what conditions Socket.getInetAddress returns null.
 */
public class UnboundSocketInetAddress {
    public static void main(String args[]) {
        //Create socket with old-fashioned constructor.
        try {
            Socket socket=new Socket("www.limewire.com", 80);
            System.out.println("Simple socket address: "
                               +socket.getInetAddress()); //non-null
            socket.close();
            System.out.println("Simple channel address: "
                               +socket.getInetAddress()); //non-null
        } catch (IOException e) {
            System.out.println("Couldn't create socket");
        }

        //Create socket from channel.
        try {
            SocketAddress addr=new InetSocketAddress("www.limewire.com", 80);
            SocketChannel channel=SocketChannel.open(addr);
            Socket socket=channel.socket();
            System.out.println("Channel socket address: "
                               +socket.getInetAddress()); //non-null
            socket.close();
            System.out.println("Channel socket address: "
                               +socket.getInetAddress()); //NULL on 1.4.1
        } catch (IOException e) {
            System.out.println("Couldn't create socket");
        }
        System.out.println();
    }
}

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

CUSTOMER WORKAROUND :
Be prepared for null when calling getInetAddress().
Or don't call getInetAddress() if the stream is closed.
(Review ID: 159833)
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