Steph, Ilya is actually having the opposite problem. I'm can't reproduce either issue. Can you give me more information about what you are trying to set into the session? What version of the SDK are you using?
On Thu, Nov 12, 2009 at 12:35 AM, Steph <[email protected]> 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)" <[email protected]> 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 <[email protected]> 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)" <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=. > > > -- 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=.
