Tomcat vs. Resin ?

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Is there any thing that works on Tomcat3.1 but not on Resin1.2 ?

The only thing I found is:
- The query string (which is returned by request.getQueryString()) is
maintained through the request even the page is forwarded by
RequestDispatcher in Tomcat, but not in Resin.

Another difference is that Tomcat has a encoding problem in getParameter()
but resin doesn't...