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POHow do I get a SessionScoped CDI bean from inside a Filter?
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  1. POHow do I get a SessionScoped CDI bean from inside a Filter?
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    copied!<p>This question is related to a previous one on <a href="https://stackoverflow.com/questions/7796612/what-is-the-method-for-gracefully-handling-session-timeout">writing a session timeout handler</a>.</p> <p>The answer in that thread involved accessing various session-scoped managed beans from the servlet. The recommendation (as seen <a href="https://stackoverflow.com/questions/6883430/prevent-accessing-restricted-page-without-login-in-jsf2">here</a>) is to do this in the filter:</p> <pre><code>HttpSession session = request.getSession(false); User user = (session != null) ? (User) session.getAttribute("user") : null; </code></pre> <p>Presumably this fetches a session bean of class <strong>User</strong>. The problem is this doesn't work.</p> <p>What goes wrong are that the beans are there in the session attributes, but they are wrapped by Weld facilities. I wrote the <strong>doFilter()</strong> method as follows:</p> <pre><code>public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpServletResponse res = (HttpServletResponse) response; String sp = req.getServletPath(); System.out.println("------------------------"); System.out.println("doFilter(): " + sp); if (!sp.startsWith("/javax")) { // eliminates many requests HttpSession session = req.getSession(); Enumeration&lt;String&gt; en = session.getAttributeNames(); int count = 0; while (en.hasMoreElements()) { String e = en.nextElement(); System.out.println("Attribute " + ++count + ": " + e); } } chain.doFilter(request, response); } </code></pre> <p>When this dumps out the session attributes, I typically get something like this:</p> <pre><code>INFO: ------------------------ INFO: doFilter(): /Display.xhtml INFO: Attribute 1: org.jboss.weld.context.http.HttpSessionContext#org.jboss.weld.bean-WEB-INF/lib/myfaces-extcdi-bundle-jsf20-1.0.1-ManagedBean-class org.apache.myfaces.extensions.cdi.jsf.impl.scope.conversation.EditableWindowContextManagerProxy INFO: Attribute 2: org.jboss.weld.context.http.HttpSessionContext#org.jboss.weld.bean-MyApp5-ManagedBean-class com.app.Login INFO: Attribute 3: org.jboss.weld.context.conversation.ConversationIdGenerator INFO: Attribute 4: com.sun.faces.renderkit.ServerSideStateHelper.LogicalViewMap INFO: Attribute 5: org.jboss.weld.context.ConversationContext.conversations INFO: Attribute 6: facelets.ui.DebugOutput INFO: Attribute 7: javax.faces.request.charset INFO: Attribute 8: org.apache.myfaces.extensions.cdi.core.api.scope.conversation.WindowContext:EXISTING_WINDOW_ID_LIST </code></pre> <p>Attribute #2 seems to represent the bean that I want. Needless to say a call to <strong>session.getAttribute("login")</strong> doesn't work.</p> <p>Can anyone say how to access the underlying managed bean? I would prefer to do it in a way that was not tied to Weld, but that may not be possible.</p>
 

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