code: public static JsonPullParser newParser(InputStream is, Charset charset) {
  		if (is == null) {
  			throw new IllegalArgumentException("'is' must not be null.");
  		}
  
  		final Reader reader =
  				new InputStreamReader(is, (charset == null) ? DEFAULT_CHARSET : charset);
  		return newParser(reader);
  	}
docs: Creates a new parser, using the given InputStream as its {@code JSON} feed.
  
  <p>
  Please call one of the {@code setSource(...)}'s before calling other methods.
  </p>
  
  @param is
  An InputStream serves as {@code JSON} feed.  Cannot be null.
  @param charset
  The character set should be assumed in which in the stream are encoded. {@link #DEFAULT_CHARSET_NAME} is assumed if null is passed.
  @return {@link JsonPullParser}
  @throws IllegalArgumentException
  {@code null} has been passed in where not applicable.