Currently, when the FileHandler creates a lock file it calls
File.deleteOnExit to delete the lock file when the VM exits.

However, the application may also close the FileHandler voluntarily.
In this case the same log file and lock file may be opened by
another application. So when the first application exits, it
may close the lock file that is now being used by the second
application.

graham.hamilton@Eng 2000-09-29