OIM DB Connection/ Data Source connection

package com.oimacademy.connection;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import com.oimacademy.properties.OIMProfileReader;
public class DataSource {
 private static Connection connectionObject = null;
 private static OIMProfileReader properties=null;
 static String JDBC_DRIVER = null;
 static String DB_URL = null;
 static String USER = null;
 static String PASS = null;
 private static Connection makeConnection() {
  try {   
   properties = new OIMProfileReader();
   JDBC_DRIVER=properties.getString("operationsDB.directDBdriver");
   DB_URL=properties.getString("operationsDB.jdbcUrl");
   USER=properties.getString("operationsDB.user");
   PASS=properties.getString("operationsDB.password");   
   Class.forName(JDBC_DRIVER);
   System.out.println("Connecting to database...");
                        System.out.println("DB User Name -> "+DB_URL);
                        System.out.println("DB URL  -> "+USER);                        
   connectionObject = DriverManager.getConnection(DB_URL, USER, PASS);
  } catch (SQLException se) {
     se.printStackTrace();
  } catch (Exception e) {   
   e.printStackTrace();
  }
  return connectionObject;
 }
 public static synchronized Connection getConnection() {
  if (connectionObject == null) {
   connectionObject = makeConnection();
  }
  return connectionObject;
 }
 public static void closeConnection() {
             System.out.println("Closing  to database connection ...");
  try {
   properties=null;
   JDBC_DRIVER=null;
   DB_URL=null;
   USER=null;
   PASS=null;
   if (connectionObject != null)
    connectionObject.close();
  } catch (SQLException se) {
   se.printStackTrace();
  }
 }
 public static void main(String args[]){
getConnection();
closeConnection();
 }
}