code: public static Byte parserByte(JsonPullParser parser) throws IOException, JsonFormatException {
  
  		State eventType = parser.getEventType();
  		if (eventType == State.VALUE_NULL) {
  			return null;
  		} else if (eventType == State.VALUE_LONG) {
  			return (byte) parser.getValueLong();
  		} else {
  			throw new IllegalStateException("unexpected state. expected=VALUE_LONG, but get="
  					+ eventType.toString());
  		}
  	}
docs: Parses the current token as a byte.
  @param parser
  @return {@link Byte}
  @throws IOException
  @throws JsonFormatException
  @author vvakame