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 -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=.
