// DATABASE
        try{
            Driver sterownik = new org.apache.derby.jdbc.ClientDriver();
            DriverManager.registerDriver(sterownik);
            Connection conn = sterownik.connect("jdbc:derby://localhost/szkolenie_javaee?user=root&password=&characterEncoding=utf8", null);
            Statement stmt = conn.createStatement();
            if(stmt.execute("SELECT * from uzytkownik")){
                ResultSet zbior = stmt.getResultSet();
                while(zbior.next()){
                    response.getWriter().print(zbior.getString("imie"));
                }
            }
            conn.close();
        } catch(SQLException e){
            e.printStackTrace();
        }