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There are a number of classes involved in request processing. The most important ones are: #WebApplication, #WebRequest, #WebResponse, #WebSession, #RequestCycle, #IRequestCycleProcessor, #IRequestCodingStrategy and #IRequestTarget. These is no single class that does all the job. Classes delegate request processing to each other and in a very simplified way in may look like this:
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Here request processing starts with WicketFilter/Servlet being called by servlet container and "ends" with IRequestTarget which asks page to render and/or calls event handling code.

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