code: @Nullable
    public static IJson readFromFile (@Nonnull final File aFile,
                                      @Nonnull final Charset aFallbackCharset,
                                      @Nullable final IJsonParseExceptionCallback aCustomExceptionHandler)
    {
      return readFromStream (new FileSystemResource (aFile), aFallbackCharset, aCustomExceptionHandler);
    }
docs: Read the Json from the passed File.
  
  @param aFile
  The file containing the Json to be parsed. May not be
  <code>null</code>.
  @param aFallbackCharset
  The charset to be used in case no BOM is present. May not be
  <code>null</code>.
  @param aCustomExceptionHandler
  An optional custom exception handler that can be used to collect the
  unrecoverable parsing errors. May be <code>null</code>.
  @return <code>null</code> if reading failed, the Json declarations
  otherwise.