Need more info. Can you show us the link? stack trace, pages.xml, etc.
I understand that this is just because of ICEFACES. I started to use Richfaces instead of icefaces.
I did the same configuration and it worked thanks to god :)
I have implemented with icefaces it works fine, Yes there is a problem with itext pdf and icefaces but it has been solved check the jira release for icefaces itext pdf.