private RowMapper<User> rowMap() {
		RowMapper<User> row =new RowMapper<User>() {	
			@Override
			public User mapRow(ResultSet rs) throws SQLException {
				return new User(
						rs.getString("userId"), 
						rs.getString("password"),
						rs.getString("name"),
						rs.getString("email"));
			}
		};
		return row;
	}

=>

	private RowMapper<User> rowMap() {
		RowMapper<User> row = rs ->new User(
				
				rs.getString("userId"), 
				rs.getString("password"),
				rs.getString("name"),
				rs.getString("email")
				
				);
		
		return row;
	}