I have written an IExceptionMapper that notifies our support team if an
unexpected exception occurs. It will redirect the user to our ErrorPage and
in the ErrorPanel.onBeforeRender I send a notification via email in a new
Thread. This mostly works except we are getting several false positives.
What I mean is that the user never sees the ErrorPanel and continues to
work. So our support team doesn't know if the user really notices an error
or not.

Here are the things that I don't understand about this behavior. If my
notification code is in the onBeforeRender of my ErrorPanel, then how does
this code execute and the user never see the panel? Also, we keep getting
the following exceptions (it seems to happen where we have a tinymce in a
form). The first one we see in development only but the second we see in
production only. However, they both seem to be around
org.apache.wicket.request.mapper.AbstractComponentMapper.getPageClass. The
second generates a notification and the user never sees the ErrorPanel. 

*Error seen in development environment:*

*Error seen in production*




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