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API / Apache Wicket Interview questions

Explain the lifecycle of a Wicket request from URL to rendered page?

A request in Wicket moves through a well-defined pipeline before any HTML reaches the browser, coordinated by the RequestCycle.

flowchart TD A[Incoming HTTP request] --> B[WicketFilter intercepts it] B --> C[RequestCycle created] C --> D[URL mapped to a page/component via IRequestMapper] D --> E{Page exists in session?} E -- Yes, stateful callback --> F[Retrieve existing page instance] E -- No, bookmarkable/new --> G[Construct new page with PageParameters] F --> H[Invoke event handler: onClick/onSubmit] G --> I[Run page/component lifecycle: onInitialize, onConfigure] H --> I I --> J[Render component tree against HTML markup] J --> K[Write final HTML to response] K --> L[Store/update page in session if stateful]

The WicketFilter is the servlet-level entry point that hands control to Wicket's RequestCycle, which uses a configured IRequestMapper to decide whether the URL points at an existing stateful page instance (a callback URL) or should construct a fresh page (a bookmarkable or mounted URL). Either way, before rendering, Wicket runs each component's onInitialize() (once, lazily, the first time a component is used) and onConfigure() (every render, to set visibility/enabled state) before actually walking the tree and merging it with the HTML template.

The final step writes the rendered HTML to the response and, for a stateful page, updates the session's page store with the (possibly changed) component state so the next callback on that page has something to act on.

What servlet-level component is the entry point that hands control to Wicket's RequestCycle?
What is the difference between when onInitialize() and onConfigure() run in a component's lifecycle?

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