private static String verifyUrl(String url, ArrayList<String> keyWordsInURL,ArrayList<String> exclusionKeyWords) {
		if (!url.toLowerCase().startsWith("http")) {
			return null;
		}
		try {
			new URL(url);
		} 
		catch (MalformedURLException e) {
			Logger.getLogger(Crawler.class).debug("Exception :"+e.getMessage() + " Description :"+ e.toString());
			return null;
		}

		for(int i=0; i<keyWordsInURL.size(); i++){
			if(!url.toLowerCase().contains(keyWordsInURL.get(i).toLowerCase())){
				return null;
			}
		}

		for(int i=0; i<exclusionKeyWords.size(); i++){
			if(url.toLowerCase().contains(exclusionKeyWords.get(i).toLowerCase())){
				return null;
			}
		}
		return url;
	}