Live demo crashes at Edit User / Your Profile

[jbn1981]

Live demo at javaeekickoff.omnifaces.org crashes when pressing save button at Edit User and Your Profile pages, showing the following error trace:

Oops!

A problem occurred during processing the ajax request. Subsequently, another problem occurred during processing the error page which should inform you about that problem.

If you are the responsible web developer, it's time to read the server logs about the bug in the error page itself.