BufferedResponseMapper doesn't recognize the the stored response because the session id is not available

WebPageRenderer logs a warning that there is a stored response but it wasn't picked by BufferedResponseRequestHandler:

WARN - WebPageRenderer - The Buffered response should be handled by BufferedResponseRequestHandler

The problem is in org.apache.wicket.request.mapper.BufferedResponseMapper.getSessionId() which was wrongly optimized to not create a new Session with http://svn.apache.org/viewvc?view=revision&revision=1186125

Workaround until 1.5.3 is released:

MyApplication#init() {

mount(new BufferedResponseMapper() {
protected String getSessionId()

{ return Session.get().getId(); }

});
}