THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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You can revert this back to 1.2.x behaviour by overriding getCSS() and returning null.
IRequestCycleProcessor got simplified
The interface itself didn't change, but we've pulled out a redundant layer of indirection that was confusing more than it helped matters. There is now a simply class hierarchy, and WebRequestCycleProcessor is the class you'll most likely need. See for more info the JIRA issue at http://issues.apache.org/jira/browse/WICKET-287