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Date: Wed, 30 Jul 2014 10:47:39 +0000 (UTC)
From: "Victor Bashurov (JIRA)" <jira@apache.org>
To: dev@felix.apache.org
Message-ID: <JIRA.12730708.1406701855219.74696.1406717259630@arcas>
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Subject: [jira] [Commented] (FELIX-4589) Problem with forwarding from one
 servlet to another
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    [ https://issues.apache.org/jira/browse/FELIX-4589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14079163#comment-14079163 ] 

Victor Bashurov commented on FELIX-4589:
----------------------------------------

RequestDispatcher rd = req.getRequestDispatcher(ForwardServlet.SERVLET_ALIAS); 
works for the sample from bitbucket [https://bitbucket.org/vbashur/diff/src] but doesn't work for my other code. Unfortunately, cannot provide code snippet. 
The workaround with using request object to obtain request dispatcher cannot be applied in a cross-context modules.
For example
Bundle 1 - /servletbridge/service
               - /servletbridge/forward
Bundle 2 - /servletmain
Within req.getRequestDispatcher it's okay to forward requests between servlets in bundle 1, but bundle 2 is unreachable. 
To forward to Bundle 2 we need to perform:
Servlet Context sc = getServetContext().getContext("/servletmain");
RequestDispatcher rd = sc.getRequestDispatcher("/");
rd.include(request, response); // welcome to the endless loop


> Problem with forwarding from one servlet to another
> ---------------------------------------------------
>
>                 Key: FELIX-4589
>                 URL: https://issues.apache.org/jira/browse/FELIX-4589
>             Project: Felix
>          Issue Type: Bug
>          Components: HTTP Service
>    Affects Versions: http-2.3.0
>            Reporter: Victor Bashurov
>
> Like in an issue FELIX-2774 (https://issues.apache.org/jira/browse/FELIX-2774) I'd like to have a several servlet bunles installed with embedded OSGI framework. I'm using servlet bridge for request's management between sevlets bundles. In order to pass the information between servlets I want to use request dispatcher to forward (or include) http queries from one servlet to another. 
> Even when I have two servlets registered in one bundle I cannot make a forwarding from one servlet to another.
> ServiceTracker
> httpService.registerServlet(TestServlet.SERVLET_ALIAS,	new TestServlet("Test servlet"), null, null);			httpService.registerServlet(ForwardServlet.SERVLET_ALIAS,	new ForwardServlet("Forward servlet"), null, null);
> Trying to do the following in a TestServlet doGet method will cause error:
> RequestDispatcher rd = getServletContext().getRequestDispatcher(ForwardServlet.SERVLET_ALIAS);
> rd.forward(req, res);
> For org.apache.felix.http.bridge-2.0.2.jar error will be NullPointerException on 'rd' variable, for version 2.2.0 the same, but for version 2.3.0 it's going to be endless loop and stackoverflow error.
> More code about the problem here: https://bitbucket.org/vbashur/diff/src (servletbundle project)


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