Creates a new link (directory entry) for an existing file. This method works in exactly the manner specified by the Files.createLink method.

The default implementation of this method throws UnsupportedOperationException.

Parameters:

link the link (directory entry) to create

existing a path to an existing file

Exceptions:

UnsupportedOperationException     if the implementation does not support adding an existing file to a directory

FileAlreadyExistsException     if the entry could not otherwise be created because a file of that name already exists (optional specific exception)

IOException     if an I/O error occurs

SecurityException     In the case of the default provider, and a security manager is installed, it denies LinkPermission("hard") or its checkWrite method denies write access to either the link or the existing file.

`link`		the link (directory entry) to create
`existing`		a path to an existing file

`UnsupportedOperationException`		if the implementation does not support adding an existing file to a directory
`FileAlreadyExistsException`		if the entry could not otherwise be created because a file of that name already exists (optional specific exception)
`IOException`		if an I/O error occurs
`SecurityException`		In the case of the default provider, and a security manager is installed, it denies `LinkPermission("hard")` or its `checkWrite` method denies write access to either the link or the existing file.