How to be sure on advisory locks ?

Hello,
The Java 1.4.2 doc says the followings:
To ensure consistent and correct behavior across platforms, it is strongly recommended that the locks provided by this API be used as if they were advisory locks.
Ref: http://java.sun.com/j2se/1.4.2/docs/api/java/nio/channels/FileLock.html
How to be sure if I use advisory locks instead of mandatory locks.
thanks in advance...

The problem here is that the File Locking mechanism provided by NIO is native to the operating system that it is operating on. On different operating systems, different file locking mechanisms are being employed. Therefore, there is no way for the JVM to guarantee you that you are getting a mandatory lock on a file. It is therefore recommended that you should assume that all locks are advisory, instead of assuming that your file is locked exclusively by yourself.
As far as implementing a known locking protocol, this protocol must be implemented by your own program. For example, as mentioned earlier, 2 instances of your program might be able to access a File based on the System's native File Locking mechanism. Therefore, you might develop your own locking protocol. While this protocol might work for your own application, there is no guarantee that your protocol is adhered to by other programs. Hope that clears the air.

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