freelucas <email@hidden> wrote:
>... The file located in a sharing
>directory of a smb server mounted to a local file system. I use the
>mac os X 10.3.3.
>The souce code showed as following:
> RandomAccessFile raf =
> new RandomAccessFile(parametersPath+"lock.dat", "rw");
> FileChannel channel = raf.getChannel();
> FileLock lock = channel.lock();
>When program executed to channel.lock(), java throw a IOException:
>Operation not supported.
>I never met the problem when i run the codes on the windows or linux.
Was the server mounted via SMB on those platforms?
>And it never happended when i lock a local file!
Locking a local file is different from locking a networked file.
Read FileLock's API docs, the section titled "Platform dependencies". It
discusses how locks are dependent on platform implementations, OS,
filesystem, etc. The closing sentence sums up with:
In general, great care should be taken when locking
files that reside on network filesystems.
And even more generally, you have to be prepared for a NIO operation not
being supported.
>So i think it is a
>java problem of file locking on network filesystem of Mac OS.
Locks might not be implemented at all on a networked SMB filesystem,
regardless of whether it's Java or C or ObjC that's trying to get the lock.
>I have
>found some document about the smb file lock on Mac OS X. But they are
>not relevant to java.
Which documents did you find, and why did you conclude they aren't relevant
to Java?
-- GG
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