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From Jess Holle <>
Subject Re: In-process connector?
Date Mon, 06 Oct 2008 18:16:02 GMT
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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