Apparently nio does not really like to work here:-(  I tested this on SuSE 9.1pro (with stock kernel) but we had problem reports from a Mandrake 10 user (with 2.6.* kernel too). 

Thanks,
-- Marco


marco@linux:/tmp> cat FileCopyTest.java
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class FileCopyTest {

    public static void main(String[] args) {
        File a = new File("/tmp/a");
        File b = new File("/tmp/b");

        copyFile(a, b);
    } // end of main()

    public static void copyFile(File source, File dest){
        try {
            FileChannel in = new FileInputStream(source).getChannel();
            if(!dest.getParentFile().exists()) dest.getParentFile().mkdirs();
            FileChannel out = new FileOutputStream(dest).getChannel();
            in.transferTo(0, in.size(), out);
            in.close();
            out.close();
        }
        catch ( IOException e ) {
            e.printStackTrace();
        }
    }
}
marco@linux:/tmp> cp -p ~/snapshot1.png /tmp/a
marco@linux:/tmp> java FileCopyTest
java.io.IOException: Invalid argument
        at sun.nio.ch.FileChannelImpl.transferTo0(Native Method)
        at sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:392)
        at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:487)
        at FileCopyTest.copyFile(FileCopyTest.java:21)
        at FileCopyTest.main(FileCopyTest.java:13)
marco@linux:/tmp> type java
java is hashed (/usr/lib/java/bin/java)
marco@linux:/tmp> java -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)
marco@linux:/tmp> ~/Creator/java/bin/java -version
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)
marco@linux:/tmp> ~/Creator/java/bin/java FileCopyTest
java.io.IOException: Invalid argument
        at sun.nio.ch.FileChannelImpl.transferTo0(Native Method)
        at sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:392)
        at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:487)
        at FileCopyTest.copyFile(FileCopyTest.java:21)
        at FileCopyTest.main(FileCopyTest.java:13)
marco@linux:/tmp> uname -a
Linux linux 2.6.4-54.5-bigsmp #1 SMP Fri May 7 21:54:56 UTC 2004 i686 i686 i386 GNU/Linux
marco@linux:/tmp> cat /etc/SuSE-release
SuSE Linux 9.1 (i586)
VERSION = 9.1

###@###.### 2004-06-02