No.
http://www-128.ibm.com/developerworks/library/j-jsf2
This is a good introduction to the JSF lifecycle and should help you understand what the
error message 'error during model update' means.
As I mentioned above it looks like you never create an instance of user (either via new
User() or create=true) so user is null (which I find a common cause of model update
errors).
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