How Tomcat Webserver Create objects of ServletRequest and Response

Tomcat webserver creates objects of ServletRequest and Response before calling the service method
How the statement is declared plz help me

ServletRequest and ServletResponse are interfaces. They are part of the Servlet API. Another parties can implement the API to their taste. Such as Apache Tomcat and Sun Glassfish. Apache Tomcat has its own implementations of the both interfaces, for example the org.apache.catalina.connector.Request and org.apache.catalina.connector.Response.
So they can just do it like follows:
javax.servlet.ServletRequest request = new org.apache.catalina.connector.Request();Apache Tomcat is open source. You can download the sources and look how they did it.
Having said that, whenever someone asks this question, they generally want to be able to create the ServletRequest in a plain vanilla Java class outside the ServletContext. Is this true? If so, please elaborate about your actual problem. Just because this indicates a bad design.

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