After login how to keep details in a sessions?

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Java

session

After log successfully I need to keep that details in a session..Can anyone know how to do that?Here is my java ogin code...(Im a beginner of sessions)

Userservlet.java

private void loginDetail(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
		
		User u = new User();
		UserService us =new UserServiceImpl() ;
		
		String Uname = request.getParameter("txtUname");		
		String Pwrd = request.getParameter("txtPwrd");	
		
		u.setUname(Uname);
		u.setPwrd(Pwrd);
		
		System.out.println(Uname+""+Pwrd);
		try {
			if(us.Userlogin(u.getUname(),u.getPwrd())){
				String message = "Thank you, " + Uname +"..You are now logged into the system";
				HttpSession session = request.getSession(true);
			    session.setAttribute("user", u);	
			    //session?
			    request.setAttribute("message", message);
				request.getRequestDispatcher("/menu.jsp").forward(request, response);
			}else {
				String message = "You have to register first or check Your user name password again!";				
				request.setAttribute("loginMsg", message);
				RequestDispatcher rd = getServletContext().getRequestDispatcher("/login2.jsp");
				rd.forward(request, response); 
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block			
			e.printStackTrace();
		}
	}