Ikai,
I'm not sure i understand.
I was having issues doing something like this in my servlet....
request.getSession().setAttribute("a",a); and then resp.sendRedirect
(redirect);
When trying to access 'a' in the redirected jsp, i kept getting null.
Once i changed my redirect to a forward, i did not have any issues. Am
i not doing this properly?
On Nov 12, 1:59 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> Ilya,
>
> This will surface the object in request scope, but you should not be having
> problems with objects stored in session scope. I'm investigating the issues
> regarding objects in session scope when deployed.
>
>
>
>
>
> On Thu, Nov 12, 2009 at 10:39 AM, IlyaE <ilyaelk...@gmail.com> wrote:
> > Steph,
>
> > I have modified my code to make use of
> > RequestDispatcher dispatcher =
> > req.getRequestDispatcher(redirect);
> > dispatcher.forward(req, resp);
> > and this seems to fix the issue.
>
> > Once i have authenticated my user and forwarded, every subsequent
> > redirect or forward maintains the proper session.
>
> > On Nov 12, 3:35 am, Steph <steph....@gmail.com> wrote:
> > > I am having the same problem. Object on my local GAE install can't be
> > > stored in the session. Very detrimental for user session management.
>
> > > Here is the line in my appengine-web.xml:
> > > <sessions-enabled>true</sessions-enabled>
>
> > > I store my user in session from inside a Filter:
>
> > > HttpSession session = httpRequest.getSession();
> > > session.setAttribute(WebConstants.USER_KEY, user);
>
> > > When I try to retrieve the user in my JSP, I get a null for
>
> > > <% User user = (User) session.getAttribute(WebConstants.USER_KEY); %>
>
> > > How is this possible such basic JSP handling could be failing?
> > > Could you please explain?
>
> > > Thanks.
>
> > > On Nov 11, 11:51 am, "Ikai L (Google)" <ika...@google.com> wrote:
>
> > > > Ilya,
>
> > > > One thing you will want to check will be if sessions are enabled.
> > Sessions
> > > > are off by default, so you'll have to add this line to your
> > > > appengine-web.xml file:
>
> > > > <sessions-enabled>true</sessions-enabled>
>
> > > >http://code.google.com/appengine/docs/java/config/appconfig.html#Enab.
> > ..
>
> > > > On Tue, Nov 10, 2009 at 12:03 PM, IlyaE <ilyaelk...@gmail.com> wrote:
>
> > > > > I'm looking to track a user session if they have "logged in" using my
> > > > > own user manager, but i was having trouble passing my user object
> > back
> > > > > to the session once the app was deployed. I will give this a shot but
> > > > > i wonder if this was because i was redirecting instead of forwarding.
>
> > > > > I was doing this in my servlet
> > > > > List<MyUser> results = (List<MyUser>)
> > > > > query.execute(email,password);
>
> > > > > if (results.size() == 0) { redirect = "/index.html"; }
> > > > > else {
> > > > > req.getSession().setAttribute("user",
> > > > > results.get(0));
> > > > > }
>
> > > > > resp.sendRedirect(redirect);
>
> > > > > and this in my jsp
> > > > > <%
> > > > > MyUser u = (MyUser) request.getSession().getAttribute("user");
> > > > > if (u != null) {
> > > > > ....
> > > > > } else { %>
> > > > > User is null
> > > > > <% } %>
>
> > > > > So i was always getting null even though i was redirected properly.
>
> > > > > Can you explain
>
> > > > > On Nov 10, 1:36 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> > > > > > Ilya,
>
> > > > > > Are you looking to persist objects for a lifetime of a session, or
> > are
> > > > > you
> > > > > > looking to minimize the logic you are using in your JSPs?
> > > > > > As a general design principle, we recommend that you minimize usage
> > of
> > > > > > session scope. Variables bound to session scope are serialized and
> > stored
> > > > > to
> > > > > > distributed memory, and as a result, it will work best if you use
> > it to
> > > > > pass
> > > > > > around small, simple, immutable objects.
>
> > > > > > If you're looking to pass a variable to a view, Java Servlets have
> > a
> > > > > concept
> > > > > > of page scope as well as session scope. You don't need to store a
> > > > > variable
> > > > > > in session scope if you just want to dispatch the request to a JSP.
> > For
> > > > > > instance, you can define a Servlet that looks like this:
>
> > > > > > public class MyServlet extends HttpServlet {
>
> > > > > > protected void doGet(HttpServletRequest request,
> > HttpServletResponse
> > > > > > response) throws ServletException, IOException {
> > > > > > String myVar = "this is a string that will be passed to the
> > JSP";
> > > > > > request.setAttribute("myVar", myVar);
> > > > > > RequestDispatcher dispatcher =
> > > > > > request.getRequestDispatcher("/WEB-INF/my.jsp");
>
> > > > > > dispatcher.forward(request, response);
>
> > > > > > }
>
> > > > > > }
>
> > > > > > In my.jsp, you can now refer to this variable:
>
> > > > > > <%@ page isELIgnored="false" %>
> > > > > > <body>
> > > > > > <h1>${myVar}</h1>
> > > > > > </body>
>
> > > > > > Ikai Lan
> > > > > > Developer Programs Engineer, Google App Engine
>
> > > > > > On Tue, Nov 10, 2009 at 2:39 PM, IlyaE <ilyaelk...@gmail.com>
> > wrote:
>
> > > > > > > Well as i found out, session attributes don't always guarantee
> > that
> > > > > > > they are sent back to the same JVM thus i keep getting null
> > objects in
> > > > > > > my view. While i saw a similar discussion before the only
> > examples i
> > > > > > > found were for Python. I'm looking for a simple java example that
> > > > > > > saves an object in the servlet and retrieves it in the jsp.
>
> > > > > > > On Nov 9, 5:44 pm, victor <victoraco...@gmail.com> wrote:
> > > > > > > > What issue are you encountering?
>
> > > > > > > > When you make changes to a session object state, make sure to
> > > > > > > > explicitly call the session.setAttribute("<you session ID>",
> > <you
> > > > > > > > modified session state object>) again.
>
> > > > > > > > i think there is an issue discussed about this before.
>
> > > > > > > > On Nov 9, 10:58 am, IlyaE <ilyaelk...@gmail.com> wrote:
>
> > > > > > > > > Does anyone have a java session handleing example? It seems
> > that
> > > > > > > > > saving objects in the session only works locally.
>
> > > > --
> > > > Ikai Lan
> > > > Developer Programs Engineer, Google App Engine
>
> > --
>
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>
> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine
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