Wicket Page Test Wiki
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Since Selenium RC 1.0.3, the Selenium server will issue a HEAD command right before a GET command to request a single HTML page. This will result in double instantiations to a Wicket Page class.
If this issue affects your tests, for example, a page counting down its instantiation time, you may better use Selenium RC 1.0.1 instead or open a page by calling selenium.open(url, "true") in Selenium Driver 1.0.3.