how to use a properties file

private static boolean processProperties(String absPropertiesPath) throws IOException {

		LOGGER.debug("Started with properties " + absPropertiesPath);
		boolean isOk = false;
		Properties prop = new Properties();
		InputStream input = null;

		//maybe some day we need to provide an internal properties file. this is how to do it!
		// processing internal properties file
		// String filename = "feed-adaptor.properties";

		// input =
		// Thread.currentThread().getContextClassLoader().getResourceAsStream(filename);
		// prop.load(input);

		String filename = absPropertiesPath;
		LOGGER.debug("trying to open properties file: " + filename);
		input = new FileInputStream(filename);
		prop.load(input);

		if (prop.isEmpty()) {
			LOGGER.fatal("ATENTION! the properties file " + filename + " is empty. Aborting!");
			return isOk;
		}
		// where are the datacast files? it could come many of them!
		DATACAST_PATH = prop.getProperty("data_cast_path");
		C2D_AGGR_DR_HDFS_PATH = prop.getProperty("c2d_aggr_dr_hdfs_path");
		DISCARDED_HDSF_PATH = prop.getProperty("discarded_hdfs_path");
		CSV_MAPPING = prop.getProperty("csv_mapping");
		DUPLICATE_LAST_COLUMN = prop.getProperty("duplicateLastColumn");
		FILENAME_REGEX = prop.getProperty("filenameregex");
		SERVICE_ID = prop.getProperty("service_id");
		DEFAULTFS = prop.getProperty("fs.defaultFS");

		// true everythings ok
		if ((DATACAST_PATH != null) && (!("").equals(DATACAST_PATH)) && (C2D_AGGR_DR_HDFS_PATH != null)
				&& (!("").equals(C2D_AGGR_DR_HDFS_PATH)) && (DISCARDED_HDSF_PATH != null)
				&& (!("").equals(DISCARDED_HDSF_PATH)) && (CSV_MAPPING != null) && (!("").equals(CSV_MAPPING))
				&& (DUPLICATE_LAST_COLUMN != null) && (!("").equals(DUPLICATE_LAST_COLUMN)) && (FILENAME_REGEX != null)
				&& (!("").equals(FILENAME_REGEX)) && (SERVICE_ID != null) && (!("").equals(SERVICE_ID))
				&& (DEFAULTFS != null) && (!("").equals(DEFAULTFS))) {

			isOk = true;
			LOGGER.debug("DATACAST_PATH, C2D_AGGR_DR_HDFS_PATH, DISCARDED_HDSF_PATH, CSV_MAPPING, DUPLICATE_LAST_COLUMN, FILENAME_REGEX, SERVICE_ID  looks find. "
					+ DATACAST_PATH
					+ " "
					+ C2D_AGGR_DR_HDFS_PATH
					+ " "
					+ DISCARDED_HDSF_PATH
					+ " "
					+ CSV_MAPPING
					+ " "
					+ DUPLICATE_LAST_COLUMN + " " + FILENAME_REGEX + " " + SERVICE_ID + " DEFAULTFS: " + DEFAULTFS);
		}

		if (input != null) {
			input.close();
		}
		return isOk;
	}