title: Tomcat thread pool usage schema
body: <p>I'm developing servlet filter intended to manage some resources which should be available during servlet processing. Since I'm not very familiar with the Tomcat, I have some doubt. Is it guaranteed that, for single request, all attached filters and the servlet itself are processed by single (and the same) thread? In other words: can I assume that <code>FilterChain.doFilter()</code> method doesn't use different thread than its caller?</p>