Oracle offers two different versions of JSP and Servlet certification.
[OLD ONE] Oracle Certified Professional,
Java EE 5 Web Component Developer (Formerly Sun Certified Web Component Developer (SCWCD)) certification provides knowledge required to develop Java EE 5 Web applications using JSP and Servlets.
http://www.epractizelabs.com/blog2/?p=140
[NEW ONE] Oracle Certified Expert,
Java Platform, Enterprise Edition 6 JavaServer Pages and Servlet Developer certification provides knowledge required to develop Java EE 6 Enterprise applications using JSP and Servlet.
http://www.epractizelabs.com/blog2/?p=106
OCE Java EE 6 JSP and Servlet Certification is recommended, because it covers latest Java EE technologies and APIs related to JSP and Servlet.