Development Warning: This page is for testing and example purposes only. Please implement your own InternalErrorPage similar to this one that extends your own custom base page and provide it in IWebApplication.getInternalErrorPage(). This ensures best integration with the rest of your application. You could add custom functionality here like a contact url or an automatic error mail being sent. Or just change the design of this page. If you decide to keep this page as it is, this warning won't be shown in wicket deployment configuration.