登录和注册servlet

Question

I'm trying to do servlet with registration I login for the first time. So I have problem with log in form. Can somebody tell me how to match data from both servlets?

I was thinking of something like this if it is possible, so I have tried all that came to my mind. I don't know if this is totally wrong.

if ((super.equals(ul.getEmail())) && (super.equals(ul.getPassword()))) { 

or

if(u.getEmail().equals(ul.getEmail()))....{

//( u is User u;)

LOGIN

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

    int Id;
    String email= request.getParameter("email");
    String password= request.getParameter("password");
    UserLog ul = new UserLog(email, password);

    Session session= HibernateUtil.getSessionFactory().openSession();
    Query query = session.createQuery("from UserLog");
    List users = query.list();
    Transaction t = session.beginTransaction();

    Id = (int) session.save(ul);
    t.commit();
    session.close();
    response.sendRedirect("index.jsp");

REGISTRATION

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

    int user_id;
    String name= request.getParameter("name");
    String lname= request.getParameter("lname");
    String username= request.getParameter("username");
    String email = request.getParameter("email");
    String password = request.getParameter("password");
    String password2 = request.getParameter("password2");

    User u = new User(name, lname, username, email, password, password2);

    Session session= HibernateUtil.getSessionFactory().openSession();
    Query query = session.createQuery("from User");
    List users = query.list();

    Transaction t = session.beginTransaction();
    user_id = (int) session.save(u);
    session.save(u);
    t.commit();
    session.close();
    response.sendRedirect("index.jsp");

Answer 1

Firstly, in Login

Query query = session.createQuery("from UserLog");

is going to return all records from UserLog . Maybe you should use a PreparedStatement and narrow down your query by using the where clause.

Also, in Login - why are you creating a Transaction and saving a record?

Secondly, in Registration is querying all records again necessary? Maybe if you want to check the existance of a record before adding it? But again use the where clause.