Yeah, I thought of "ATM machine" which means "automated teller machine machine". But when I searched the web for that it led me to a Wikipedia page which noted that it was redundant and pointed to another Wikipedia page about RAS syndrome (which is also a redundant acronym which describes the general phenomenon of redundant acronyms.
To be fair, I don't find repetition such as JSP pages redundant. "Java Server Pages" is the name of a technology or standard. A "Java Server Pages page" is a template that makes use of that technology.
Contrast PIN, which literally refers to the actual number. A "personal identification number number" makes no sense.