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From Jess Holle <>
Subject Re: In-process connector?
Date Mon, 06 Oct 2008 19:44:28 GMT

Thanks for the helpful reply.

I just wish I could have figured out how to word my question better so 
as to elicit this helpful information to start with -- instead of 
getting told I was posting to the wrong group and chasing my tail with it.

Jess Holle

Costin Manolache wrote:
> Well, there is interest - the tomcat-lite in the sandbox does allow that (
> there is even a TomcatLiteNoConnector unit test ).
> The code is broken right now - in process of moving part of it to trunk and
> adjusting it to be easier to digest. Will take quite a while
> before it's ready for an official release - but ability to run 'in process'
> ( either as unit tests,  or as you describe ) is one of the goals.
> Costin
> On Mon, Oct 6, 2008 at 11:16 AM, Jess Holle <> wrote:
>> Having looked into this further it seems clear Tomcat is not designed to
>> provide any reasonably reliable / easy-to-use means of making a JSP or
>> servlet request from within the process but outside a connector request
>> thread.  If one wants to properly do this it would appear one has to call
>> org.apache.catalina.core.StandardEngineValve.invoke() oneself -- with Tomcat
>> Request and Response objects.  Ideally there would be a way to instead
>> implement HttpServletRequest and HttpServletResponse as desired, mimicking
>> remote client to the degree needed, get a RequestDispatcher [from a cached
>> ServletContext], and call forward(), for instance -- possibly capturing the
>> context class loader in a ContextListener and setting that as the context
>> class loader around all this.  That /kind of/ works for include(), but skips
>> all servlet filters and does not work at all for forward().
>> I fully realize the servlet specification spells out no such mechanism, but
>> I believe there is a clear gap here.  One should be able to embed Tomcat in
>> an application and /easily /invoke a JSP or servlet to produce an HTML
>> e-mail body, for instance.  This should involve a minimum of Tomcat-specific
>> APIs.
>> It is hard to understand why one should be unable to re-use one's JSPs and
>> servlet investment to produce HTML for other purposes than HTTP responses.//
>>  It is also quite unclear to me why there appears to be no interest in
>> addressing this need.
>> --
>> Jess Holle
>> Jess Holle wrote:
>>> I find no user documentation on anything like what I'm looking for.
>>> I thus am /assuming/ this would be an extension to Tomcat and thus more
>>> appropriate for a development forum than a user forum.
>>> I want to call JSPs, etc, from Java code to generate HTML.  I'm not
>>> looking for a web server connector -- that would be a clear user group
>>> question.
>>> Remy Maucherat wrote
>>>> On Wed, 2008-09-17 at 07:48 -0500, Jess Holle wrote
>>>>> Is there an in-process connector for Tomcat somewhere out there?
>>>>> Specifically I want to be able to embed Tomcat and use JSPs, etc, to
>>>>> generate HTML but without requiring loopback HTTP(S) requests.
>>>>> Does such a thing exist?  If not, would this be hard to add?
>>>>> Pointers and suggestions would be much appreciated.
>>>> There is a user list for questions on Tomcat usage.
>>>> Rémy

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