Github user bitstorm commented on the issue:
https://github.com/apache/wicket/pull/342
@svenmeier i agree with the overall goal of accessing to render components
only. There is however a huge drawback with this solution as now onConfigure is
executed before form validation or event handling. Components like
FeddbackPanel can not work properly anymore.
To overcome this limit with stateless pages we can consider to use a brand
new page instance for rendering phase. To achieve this result we can for
example detach PageComponentProvider after we have invoked the required
listener.
I will commit this improvement as soon as possible.
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