Servelts, jsp error return true

I'm doing a data maintainer in jsp, so for the user validation part I use servelts to make calls to mysql.

In the servelts of consultas.java I have this (it is to do reedireccion 1 is admin 2 is standard):

    public boolean comprobar (String usuario,String contraseña){
    PreparedStatement pst = null;
    ResultSet rs =null;
    try {
        String sql = "Select nivel from usuarios where usuario = ? and password =?";
        pst = getconexion().prepareStatement(sql);
        pst.setString(1, usuario);
        pst.setString(2, contraseña);

        rs = pst.executeQuery();
        if (rs.next()) {
            int id = rs.getInt("nivel");
            System.out.print(id);
            if (id == 1) {
               return true; 
            }else{
                return false;
            }
        }

    } catch (Exception e) {
        System.err.println("Error comprobar"+e);
    }
    return false;
}

Then in the servelt of login.java I have one to validate the existing user which does the same thing returns true or false, and inside I introduce the user level checking

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();

    String usuario = request.getParameter("txt_user");
    String contraseña = request.getParameter("txt_pass");

    consultas co = new consultas();

    if (co.autenticacion(usuario, contraseña)) {//Este da true sin dramas

        if (co.comprobar(usuario, contraseña)) {//Este deberia dar true desde consultas.java
            response.sendRedirect("entrada_admin.jsp");

        }else{ //Pero siempre termina aca sin importar el usuario  -__-
            response.sendRedirect("entrada_estandar.jsp");
        }

    }else{
        response.sendRedirect("index.jsp");
    }
}

As mentioned, the code does not send me where I want. I have tried checking with this code inside queries and it returns true and false without problems.

    public static void main(String[] args) {
    consultas co = new consultas();
    System.out.println(co.comprobar("usuario", "contraseña"));

}