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From "Costin Manolache" <>
Subject Re: In-process connector?
Date Mon, 06 Oct 2008 20:00:20 GMT
About how to word the question for tomcat-dev: "Hi, I'm interested in
developing an 'in-process' feature if it's not already there,
will start sending out patches " :-)

BTW - there is also an 'in-memory' connector in coyote, not sure what's his
status - but it can be easily enhanced.
You actually need 3 things:
- launching tomcat in-process - there are few ways to do this ( easy if you
can keep the dir layout, harder but possible if you don't )
- use a connector that doesn't open ports
- some API to make it easier to communicate with the connector - basically
populate the coyote request and pull the response.


On Mon, Oct 6, 2008 at 12:44 PM, Jess Holle <> wrote:

> Cool.
> 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,
>>>>>> 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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