Name: js151677 Date: 09/22/2004


FULL PRODUCT VERSION :
java version "1.4.2_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux hive 2.6.6 #8 Tue Aug 10 13:08:57 BST 2004 i686 athlon i386 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
Reduce the length to Integer.MAX_VALUE and it works fine, increase it to Integer.MAX_VALUE + 1, and you get an IllegalArgumentException with a much shorter stack trace:

Exception in thread "main" java.lang.IllegalArgumentException
        at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:569)
        at test.main(test.java:19)

This exception is NOT documented; the documentation gives no reason to suggest that any positive length would be illegal. I'd mention what the source says, except I can't find sun.nio.

After discovering this bug, I found that due to other bug(s) recorded in the database, FileChannels transferFrom and transferTo on linux are useless for non blocking IO, so this is a moot point for me anyway.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Step 1: Enter the attached test case into a file called test.java
Step 2: Compile test.java with "javac test.java"
Step 3: Run the test case with "java test"

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
[program waits indefinitely]
ACTUAL -
Exception in thread "main" java.lang.IllegalArgumentException
        at java.nio.Buffer.limit(Buffer.java:249)
        at sun.nio.ch.FileChannelImpl.transferFromArbitraryChannel(FileChannelImpl.java:535)
        at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:576)
        at test.main(test.java:18)

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.IllegalArgumentException
        at java.nio.Buffer.limit(Buffer.java:249)
        at sun.nio.ch.FileChannelImpl.transferFromArbitraryChannel(FileChannelImpl.java:535)
        at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:576)
        at test.main(test.java:18)


REPRODUCIBILITY :
This bug can be reproduced always.

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

public class test {
        public static void main(String[] args) throws IOException
        {
                // open a client socket channel
                SocketChannel socket = SocketChannel.open();
                socket.socket().connect(new InetSocketAddress("www.google.com", 80));

                // open a file channel
                FileOutputStream out = new FileOutputStream("out.tmp");
                FileChannel file = out.getChannel();

                // copy directly from socket channel into file channel
                file.transferFrom(socket, 0, Long.MAX_VALUE);
        }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Don't be stupid enough to try and transfer more than 2Gb of data at once :).
(Incident Review ID: 311376)
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