in reply to jsp for perl people?

If you're using JSTL (JSP Standard Template Language) then JSTL In Action is a gentle but useful introduction with lots of examples. Otherwise I've had good experiences with O'Reilly's Java Server Pages which devotes a chapter to JSTL (maybe more in the 3rd edition) but also covers scriptlets, directives and lots of different JSP architectures (everything in page, page as view, front controller servlet, etc.).

Good luck!

M-x auto-bs-mode