You need to read Sun's FAQ.
http://suned.sun.com/US/certification/faq/#recert But, in short to answer your question:
How long is my certification title "good"?
Unless otherwise stated, and beginning with all Sun Certification exams taken after September 1, 2002, certification offerings from Sun are valid for two (2) years from the date of certification. The certification date will appear on both a certificate and an identification card with the applicable certification title. The identification card will also include an expiration date, on which an IT professional's Sun certification status expires. Sun may maintain multiple versions of any certification exam or title to meet varying global demand for title versions and to offer IT professionals flexible certification options. Sun reserves the right to retire specific Sun certification exams or titles for any reason and at any time. Sun's recertification policy and program are subject to change without notice.
So, in other words, your certification is still good.