@Nullable
  public static String getCanonicalPath (@Nullable final Path aFile) throws IOException
  {
    // Note: getCanonicalPath may be a bottleneck on Unix based file systems!
    return aFile == null ? null : aFile.toRealPath ().toString ();
  }
@ Nullable public static String getCanonicalPath ( @ Nullable final Path aFile ) throws IOException { return aFile == null ? null : aFile . toRealPath ( ) . toString ( ) ; }
Get the canonical path of the passed file, if the file is not
<code>null</code>.

@param aFile
The file to get the canonical path from. May be <code>null</code>.
@return <code>null</code> if the passed file is <code>null</code>.
@throws IOException
If an I/O error occurs, which is possible because the construction
of the canonical pathname may require filesystem queries