@Override
public void setUser(User user) {
  try {
  DB dataBase = DBUtil.getDataBase("mymongodb");
  DBCollection userCollection = DBUtil
	.getCollection(dataBase, "User");
  BasicDBObject document = new BasicDBObject();
  document.put("username", user.getUserName());
  document.put("password", user.getPassword());
  // insert into database
  userCollection.insert(document);
  // commit into database
  userCollection.save(document);
  } catch (UnknownHostException e) {
	e.printStackTrace();
  } catch (MongoException e) {
	e.printStackTrace();
  }
}