Just to dump in two cents....
I was receiving the same error when moving a webapp from Tomcat standalone to JBoss 4.0.4
GA. When looking at the existing web.xml I noticed that some properties that were set
using net.sourceforge.myfaces. Recalling from some JBoss JSF documentation that the
default JSF implementation was provided by Apache, I looked into which library Tomcat
(embedded) was using - and behold it was Apache's implementation.
Now I would think that having the net.sourceforge implementation in my WEB-INF would
prompt Tomcat to use that impl, but it didn't. When I replaced the default Apache
impl with the net.sourceforge everything was fine.
How to change jsf impl:
Section 9.9 of:
http://docs.jboss.org/jbossas/jboss4guide/r4/html/ch9.chapt.html
(thanks to a previous post for providing this URL)
Afore mentioned tag lib issue might still be an issue but for me it was just the JSF
implementation.
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