Get credentials from addons json file

Credentials.java

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class Credentials {
	/*
	 * Example of use:
	 * Credentials cr = new Credentials();
	 * String addon = "MYSQLSDEV";
         * HashMap<String, Object> creds = cr.getCredentials(addon);
         * String database = (String)creds.get("database");
         * String password = (String)creds.get("password");
         * Long port = (Long)creds.get("port");
         * String hostname = (String)creds.get("hostname");
         * String username = (String)creds.get("username");
	 */

	private JSONObject credFile;
	
	public Credentials() {
		this.credFile = getCredFile();
	}
	
	public HashMap<String, Object> getCredentials(String addon) {
		HashMap<String, Object> creds = new HashMap<String, Object>();
		if ( (addon == "MYSQLSDEV") || (addon == "MYSQLS") || (addon == "MYSQLD") ) {
			creds.put("database", getCredential("database", addon));
			creds.put("password", getCredential("password", addon));
			creds.put("port", getCredential("port", addon));
			creds.put("hostname", getCredential("hostname", addon));
			creds.put("username", getCredential("username", addon));
		} else if (addon == "MONGOLAB") {
			creds.put("uri", getCredential("uri", addon));
		}
		else System.out.println("No available addon");
		
		return creds;
	}
	
	private Object getCredential(String param, String addon) {
		String upper_param = param.toUpperCase();
		JSONObject addonJSON = getAddon(credFile, addon);
		// TODO credential in addon validation
		Object credential = addonJSON.get(addon+"_"+upper_param);
		return credential;
	}
	
	private JSONObject getCredFile() {
		JSONObject credFile = new JSONObject();
		JSONParser parserJSON = new JSONParser();
		Map<String, String> env = System.getenv();
		
		String credFilePath = (String)env.get("CRED_FILE");
		System.out.println("cred file path: " + credFilePath);
		try {
			Object obj = parserJSON.parse(new FileReader(credFilePath));
			credFile = (JSONObject) obj;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ParseException e) {
			e.printStackTrace();
		}

		return credFile;
	}