Name: rmT116609 Date: 03/05/2002


FULL PRODUCT 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)

FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Version 5.00.2195]

DESCRIPTION OF THE PROBLEM :

I have a thread acepting network connections in ServerSocketChannel.accept(). When I need to cleanly shutdown my program, I interrupt() the thread which is
blocked in accept(), catch the ClosedByInterruptException and cleanly shutdown.

This worked fine under JDK build 1.4.0-beta3-b84.

Under build 1.4.0-b92, the thread blocked in accept() does not respond to the interrupt(). Under JBuilder 6 debugger, I see the following stack when I pause the program after calling interrupt():

  java.lang.Thread interrupt() (Thread.java:741)
  java.nio.channels.spi.AbstractInterruptibleChannel$1
interrupt() (AbstractInterruptibleChannel.java:147)
  java.nio.channels.spi.AbstractSelectableChannel
implCloseChannel() (AbstractSelectableChannel.java:202)
  sun.nio.ch.ServerSocketChannelImpl
implCloseSelectableChannel()
(ServerSocketChannelImpl.java:153)
  sun.nio.ch.ServerSocketChannelImpl kill()
(ServerSocketChannelImpl.java:158)

The system just hangs there.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a thread which blocks in ServerSocketChannel.accept()
2. From another thread, call Thread.interrupt() on the previous thread.
3. The first thread will hang in ServerSocketChannelImpl.kill()



EXPECTED VERSUS ACTUAL BEHAVIOR :
Using the attached test program, I see the folloing output from test runs under the two different JDK's.

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

C:\work\test>java -version
java version "1.4.0-beta3"
Java(TM) 2 Runtime Environment, Standard Edition (build
1.4.0-beta3-b84)
Java HotSpot(TM) Client VM (build 1.4.0-beta3-b84, mixed
mode)

C:\work\test>java dave.shutdowntest
Creating thread...
Starting thread...
Thread running.
Accepting...
Interrupting thread...
  Closed By Interrupt!!!
Test done.

C:\work\test>

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

C:\work\test>java -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)

C:\work\test>java dave.shutdowntest
Creating thread...
Starting thread...
Thread running.
Accepting...
Interrupting thread...

(program never terminates)

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


This bug can be reproduced always.

---------- BEGIN SOURCE ----------

package dave;

import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;

public class shutdowntest
{
    class AcceptThread extends Thread
    {
        public void run()
        {
            System.out.println("Thread running.");
            try
            {
                ServerSocketChannel channel = ServerSocketChannel.open();
InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(),7000);
                channel.socket().bind(address);

                while (!isInterrupted())
                {
                    System.out.println("Accepting...");
                    SocketChannel socketChannel = channel.accept();
                    System.out.println("Accepted.");
                    Socket socket = socketChannel.socket();
                   
System.out.println("Accepted connection: " + socket.toString());
                    socket.close();
                }
            }
            catch(BindException be)
            {
                System.out.println("BIND address already in use");
            }
            catch (ClosedByInterruptException cbie)
            {
                System.out.println("Closed By Interrupt!!!");
            }
            catch(IOException ioe)
            {
                System.out.println("IOException: " + ioe);
            }
        }
    }

    public shutdowntest()
    {
    }

    public void test() throws Exception
    {
        System.out.println("Creating thread...");
        AcceptThread t = new AcceptThread();
        System.out.println("Starting thread...");
        t.start();
        Thread.currentThread().sleep(10000);
        System.out.println("Interrupting thread...");
        t.interrupt();
        Thread.currentThread().sleep(10000);
        System.out.println("Test done.");
    }

    /**
     *
     */
    public static void main(String[] args) throws Exception
    {
        new shutdowntest().test();
    }
}

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

CUSTOMER WORKAROUND :
Stopping the application using Ctrl-C.

Release Regression From : merlin-beta3
The above release value was the last known release where this
bug was knwon to work. Since then there has been a regression.

(Review ID: 143484)
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