Hi,
The problem has been mysteriously solved by doing an upgrade to 2.2.3
with clean-up of previous version.
I also solved the problem with logging by using this link
http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Logging
http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Logging
Yet it's interesting to know what might cause the page's date to be null
or trigger null-pointer exception with date format.
Regards,
Roman
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