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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