// File consists of json objects
FileInputStream inputStream = null;
Scanner sc = null;
try {
     inputStream = new FileInputStream(file_path);
     sc = new Scanner(inputStream, "UTF-8");
     while (sc.hasNextLine()) {
	String line = sc.nextLine();
	JsonObject json = new JsonParser().parse(line).getAsJsonObject();
        //...
     }
     inputStream.close();
     sc.close();
} catch (Exception e) {
     logger.error("Error occured while indexing observations dump file.", e);
}