Doyou see these issues locally or when deployed?
On Tue, Nov 17, 2009 at 9:03 PM, Obelix <[email protected]> wrote:
> Ikai
>
> Even this basic page scope isn't working for me.
>
> public void doGet(HttpServletRequest req, HttpServletResponse resp)
> throws IOException, ServletException {
> req.setAttribute("helloWorld", "Testing");
> RequestDispatcher dispatcher =
> req.getRequestDispatcher("/helloworld.jsp");
> dispatcher.forward(req, resp);
> }
>
> <%@ page isELIgnored="false" %>
>
> <body>
>
> Hello world
>
> <% String str = (String) session.getAttribute("helloWorld"); %>
>
> <h1>${helloWorld}</h1>
>
> </body>
>
> The value for ${helloWorld} is null.
>
> I am testing this through eclipse.
>
> Google App Engine Java SDK 1.2.6
> Google Web Toolkit SDK 1.7.1
> Google Plugin for Eclipse 3.5
>
> I am running this on mac (snow leopard).
>
> java version "1.6.0_15"
> Java(TM) SE Runtime Environment (build 1.6.0_15-b03-219)
> Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02-90, mixed mode)
>
>
> On Nov 10, 10:36 am, "Ikai L (Google)" <[email protected]> wrote:
> > Ilya,
> >
> > Are you looking to persist objects for a lifetime of a session, or are
> you
> > looking to minimize the logic you are using in your JSPs?
> > As a general design principle, we recommend that you minimize usage of
> > session scope. Variables bound to session scope are serialized and stored
> to
> > distributed memory, and as a result, it will work best if you use it to
> pass
> > around small, simple, immutable objects.
> >
> > If you're looking to pass a variable to a view, Java Servlets have a
> concept
> > of page scope as well as session scope. You don't need to store a
> variable
> > in session scope if you just want to dispatch the request to a JSP. For
> > instance, you can define a Servlet that looks like this:
> >
> > public class MyServlet extends HttpServlet {
> >
> > protected void doGet(HttpServletRequest request, HttpServletResponse
> > response) throws ServletException, IOException {
> > String myVar = "this is a string that will be passed to the JSP";
> > request.setAttribute("myVar", myVar);
> > RequestDispatcher dispatcher =
> > request.getRequestDispatcher("/WEB-INF/my.jsp");
> >
> > dispatcher.forward(request, response);
> >
> > }
> >
> > }
> >
> > In my.jsp, you can now refer to this variable:
> >
> > <%@ page isELIgnored="false" %>
> > <body>
> > <h1>${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.
>
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>
>
--
Ikai Lan
Developer Programs Engineer, Google App Engine
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