import javax.servlet.ServletContextListener;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.json.JSONObject;
<BUG>import org.oliot.epcis.service.query.mongodb.MongoSubscription;
public class Configuration implements ServletContextListener {</BUG>
public static String backend;
public static Logger logger;
public static String webInfoPath;

import javax.servlet.ServletContextListener;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.json.JSONObject;
import org.oliot.epcis.service.query.mongodb.MongoSubscription;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoDatabase;
public class Configuration implements ServletContextListener {
public static String backend;
public static Logger logger;
public static String webInfoPath;
