pageId is being reset during Session::replaceSession() call

I'm using replaceSession(); method to prevent session fixation

2 pages are being created with same pageId, in case Session.get().replaceSession(); method is being called to prevent session fixation

Du to pageId is being set to 0 during session replacement process

discussion thread: http://markmail.org/message/vve2o4wrytonm7w5