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From "Bram de Kruijff (JIRA)" <>
Subject [jira] [Updated] (ACE-159) Register servlets under objectClass javax.servlet.Servlet instead of javax.servlet.http.HttpServlet
Date Thu, 28 Jul 2011 14:16:10 GMT


Bram de Kruijff updated ACE-159:

    Attachment: ACE-159-toServlet.patch

Attached the patch that refactors to Servlet. All itests pass and I tested basic functionality
against the devserver webui en rest api.

This resolves issues 1 and 2. However issue 3 turns out to be a little more difficult as the
path service property is hardcoded to "org.apache.ace.server.servlet.endpoint". Obviously,
other whiteboard implementations don't look at this.

Several possible solution:

0) Do not change ACE! Whiteboard adaptors should be smarter. Drawback is we'll need to convince
multiple implementors.
1) For servlet registrations use DM configuration dependencies that (blindly) propagate  configuration
entries to service registration properties. Drawback is we'll lose some sanity checking that
is now in updated methods.
2) Refactor ACE to use hardcoded values "alias" which is consistent with Felix/Amdatu whiteboard
implementations. Drawback is it will break sometime.
3) Support optional "org.apache.ace.server.servlet.endpoint.propertykey" configuration to
be used instead of the default. Drawback is added (config) complexity.

I am undecided. Opinions? Could reopen this in a new issue not to stall this one.

> Register servlets under objectClass javax.servlet.Servlet instead of javax.servlet.http.HttpServlet
> ---------------------------------------------------------------------------------------------------
>                 Key: ACE-159
>                 URL:
>             Project: Ace
>          Issue Type: Improvement
>    Affects Versions: 0.8.0
>            Reporter: Bram de Kruijff
>         Attachments: ACE-159-toServlet.patch
> ACE registers its servlets whiteboard style under objectClass=javax.servlet.http.HttpServlet.
The custom whiteboard implementation HttpListener bridges them to available Http services.
> 1) I think strictly speaking this is not spec compliant as HttpServlet is not an interface?
> 2) It is unnecessarily specific as HttpService#registerServlet accepts javax.servlet.Servlet
> 3) It is not (out of the box) portable to Felix HTTP whiteboard or Amdatu Dispatcher
> For these reasons I'd suggest switching to objectClass=javax.servlet.Servlet. Would be
happy to work on a small patch if there is some consensus that this is a good idea.

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