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POguice servlet is not a singleton
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  1. POguice servlet is not a singleton
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    copied!<p>something awful is happening</p> <p>i have 2 servlets in my project - one of them simply has a post method and is responsible for handling file uploads. i recently added the other one - it has a get and a post method.</p> <p>here is the 2nd servlet code</p> <pre><code>@Singleton @WebServlet("/Medical_Web") public class XXXDetailsServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Inject private Provider&lt;XXXPersistenceManager&gt; persistenceManager; @Inject private Provider&lt;XXXChain&gt; chainProvider; @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("servlet address = " + this); final String xxx= request.getParameter("xxx"); String json = ""; try { final XXXBean xxxBean = persistenceManager.get().find(xxx); json = new GsonBuilder().create().toJson(xxxBean); } catch (Exception ex) { ex.printStackTrace(); } request.setAttribute("json", json.trim()); getServletContext().getRequestDispatcher("/XXX.jsp").forward(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("servlet address = " + this); final String xxx = request.getParameter("xxx"); try { final XXXChain chain = chainProvider.get(); chain.getContext().setAttribute(XXX_TYPE, XXXType.DELETE); final XXXBean xxxBean = persistenceManager.get().find(xxx); final List&lt;XXXBean&gt; xxxList = new ArrayList&lt;XXXBean&gt;(); xxxList.add(xxxBean); chain.process(xxxList); } catch (Exception ex) { ex.printStackTrace(); } } } </code></pre> <p>now - here's whats getting me</p> <p>for some reason - even though this is marked as a @Singleton - the servlet addresses are definitely coming back as different. I noticed this initially when I hit a null pointer in my post method - whenever i call the get method, the instance of the servlet i get back has all the fields populated. whenever i call the post method, the instance of the servlet i get back (it is a different instance) does not have the fields populated (just null, seems like they didn't get injected).</p> <p>I'm really struggling to figure out what's going on here. it seems as if an instance of this servlet was created outside of the guice context. if it matters - we are using JBoss 7.1</p> <p>(sorry about all the XXX's, don't know if i can post actual names)</p> <hr> <p>here's the rest of my guice setup</p> <pre><code>public class XXXServletContextListener extends GuiceServletContextListener { @Override protected Injector getInjector() { return Guice.createInjector(new XXXUploadModule(), new XXXServletModule()); } } </code></pre> <p>and here's the servlet module</p> <pre><code>public class XXXServletModule extends ServletModule { @Override protected void configureServlets() { serve("/xxx1").with(XXXDetailsServlet.class); // this one fails on post serve("/xxx2").with(XXXUploadServlet.class); // this one works } } </code></pre>
 

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