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POServlet's sendRedirect() kills my session attributes
 

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    <p>I am working on a webapp in WinXP, Eclipse Indigo and Google web plugin.</p> <p>I have a simple form that takes a value from user (e.g email) , passes it to a servlet named <code>SignIn.java</code> that processes it and saves the email value to the session. The <code>SignIn</code> code is very simple , here is what its <code>doGet</code> mostly does:</p> <pre><code>String email = req.getParameter("email"); //getting the parameter from html form ... ... HttpSession session = req.getSession(); //create a new session session.setAttribute("email", email); </code></pre> <p>So far so good, I've verified that the values aren't <code>null</code> at this point. Now comes the problem, I want to redirect to another servlet (<code>ShowOnline.java</code>) that needs to do some more processing. When I write</p> <pre><code>resp.sendRedirect(resp.encodeRedirectURL("/ShowOnlineServlet")); </code></pre> <p><code>ShowOnline</code> gets <code>null</code> session values (the same email attribute I saved a second before is now <code>null</code>)</p> <p>When I write </p> <pre><code>getServletConfig().getServletContext().getRequestDispatcher("/ShowOnlineServlet"); </code></pre> <p>everything is OK, the email attribute from before isn't <code>null</code>!</p> <p>What is going on? <code>sendRedirect()</code> just makes your browser send a new request, it shouldn't affect the session scope. I have checked the cookies and they are fine (it is the same session from before for sure since it is the first and only session my webapp creates and furthermore I even bothered and checked the sesison ID's and they're the same on both requests).</p> <p>Why would there be a difference between <code>sendRedirect()</code> and <code>forward()</code>? The easy solution would be to use <code>forward()</code> but I want to get to the bottom of this before I just let go , I think it is important for me to understand what happened. I'm not sure I like the idea of not knowing what's going on on such basic concepts (my whole webapp is very simple and basic at this point since I'm a beginner).</p> <p>Any thoughts ideas or suggestions would be warmly welcome !</p>
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    1. USJoel_Blum
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    1. COI guess it might be possible at the moment to use forward instead of sendredirect but I think later on I'd want to use sendredirect without fearing my session attributes would go null for no apparent reason .
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      1. USJoel_Blum
    2. CO@home: OP confirmed that session ID is the same before and after.
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    3. COwhat happens when you don't send redirect and manually go to the /ShowOnlineServlet from the browser?
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      1. USOleg Mikheev
 

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