Fnd out when a file is added to a directory

Does anyone know if theres a way to send a signal / cause an event when a file (which could be of any type and any filename), is added to a directory.
Eg When a file is added to the directory 'mynewfiles' I want to send a signal to another process that will copy a version of this to another directory.
Is this possible in Java? Without using polling?

I'm pretty sure there's no alternative to polling, though you can at least poll the "last modified" timestamp before checking the contents.
A signal facility would have to be plugged right into the operating system.

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