java.nio.FileLock

The end of java.nio.FileLock specification tells us

see:

http://java.sun.com/j2se/1.5.0/docs/api/java/nio/channels/FileLock.html

Some network filesystems permit file locking to be used with memory-mapped files only when the locked regions are page-aligned and a whole multiple of the underlying hardware's page size. Some network filesystems do not implement file locks on regions that extend past a certain position, often 230 or 231. In general, great care should be taken when locking files that reside on network filesystems.

What do the mean under "page-aligned" and

"xtend past a certain position, often 230 or 231"?

[667 byte] By [dbes@isd.dp.uaa] at [2007-11-26 16:27:52]