Thread: Login / Logout Session | why it isn't working?

Why my login session is not working? it should run out.println("Welcome "+ session.getAttribute("username") +" <a href=\"logout.jsp\" >Logout</a>"); when i logged in

Login.jsp

        <%
 
            if(session.getAttribute("username")!=null)
                {
                 out.println("Welcome  "+ session.getAttribute("username") +"  <a href=\"logout.jsp\" >Logout</a>");
                }
            else {
          %>
        <a href="#login-box" class="login-window">Login</a>
           <div id="login-box" class="login-popup">
            <a href="#" class="close"><img src="images/close_pop.png" class="btn_close" title="Close Window" alt="Close" /></a>
              <form method="post" class="signin" action="doLogin.jsp">
                    <fieldset class="textbox">
                   <label class="username">
                    <span>Username or email</span>
                    <input id="username" name="username" value="" type="text" autocomplete="on" placeholder="Username">
                    </label>
                    <label class="password">
                    <span>Password</span>
                    <input id="password" name="password" value="" type="password" placeholder="Password">
                    </label>
                    <button class="submit button" type="submit">Sign in</button>
                    <!-- <input  class="button" name="login" type="submit" value="Sign In"> -->
                    <p>
                    <a class="forgot" href="#">Forgot your password?</a>
                    </p>       
                    </fieldset>
              </form>

doLogin.jsp

    <%@ page import="java.sql.*,java.util.*,java.text.*,java.text.SimpleDateFormat" %>
    <%
 
        String username = request.getParameter("username");
        String password = request.getParameter("password");
 
        Connection conn = null;
 
        try {
 
            conn = DriverManager.getConnection("jdbc:mysql://localhost/database", "root", "");
            Statement st = conn.createStatement();
            //System.out.println("User name [" + username + "] Password [" + password +"]");
            ResultSet rs = st.executeQuery("select nama from user where nama = '" + username + "' AND password = '" + password + "'");
            if (rs.next())
             {
             response.sendRedirect("login.jsp");
             }
          else {
              out.println("Login Failed,Please try Again");
    %>
 
    <%
 
                //response.sendRedirect("login.jsp");
                conn.close();
            }
 
        } catch (Exception e) {
            e.printStackTrace();
        }
    %>

it's working man! thanks!
wait a minute i found something wrong, after i try logged in, it still stuck in doLogin.jsp with blank page, that won't directing to index.jsp
this line

        if (rs.next()) 
			{
			session.setAttribute("sesusername", rs.getString("username"));
			session.setAttribute("sespassword", rs.getString("password"));
			response.sendRedirect("index.jsp");
			} 
		else {
    		out.println("Login Failed,Please try Again");

it should redirect user after logged in into index.jsp, but it stuck
then i try push back button in my browser, i already logged in
what happend now with that send response.sendRedirect("index.jsp");
i already clear the cache, is still the same

bump
dunno why my response.sendRedirect("index.jsp");
won't working