File locking supported on all platforms?

[Jonas Konrad]

Hey,

Some file systems on Linux, eg old NFS, do not support locking at all.

- Jonas

On 7/11/20 11:36 AM, Stefan Reich wrote:
> Hi,
> 
> a quick question regarding file locks in Java. I seem to remember 
> reading somewhere that this feature isn't guaranteed to work on all 
> platforms. However, I can now find no mention of that e.g. here 
> <https://docs.oracle.com/javase/7/docs/api/java/nio/channels/FileLock.html>.
> 
> The page does list that numerous special assumptions may fail, for 
> example that programs which /don't/ lock a file are prevented from 
> changing it when it is locked by another program.
> 
> However, I only care about the basic feature, namely that one local file 
> cannot be locked by two Java programs at once and will cause one of them 
> to throw an exception.
> 
> Is this guaranteed to work everywhere?
> 
> Many greetings
> Stefan
> 
> -- 
> Stefan Reich
> BotCompany.de // Java-based operating systems