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Renaming a method, especially a getter / setter will rename this in every java source but not in corresponding web pages. Thus, all references from jsp/facelets are broken. I don't know, whether this is a bug or just a missing feature. ;-)
Basically a missing feature, changing to ENHANCEMENT.
Such a feature is available for Faclets since version 7.2 or 7.3 I haven't checked for outdated JSP technology. But IMHO this issue may be closed now.
According to the New&Noteworthy document looks to be implemented since nb7.0: http://wiki.netbeans.org/NewAndNoteworthyNB70#Expression_Language Works well in Facelets and JSPs on expressions.