Spring certifications are available via VMware-
http://mylearn.vmware.com/mgrReg/plan.cfm?plan=31110&ui=www_cert
Basically 3 certification - each one is independent of the other - though if you are starting of - the first one to do would be the
Spring Professional
Like Jeanne has pointed out it's a combination of classroom training followed by a certification exam (you have 1 year from end of course to give the exam.)
A really good start place to get all the details related to the exam would be
http://springcert.sourceforge.net/
I believe that includes a good section from 1.2 Question Breakdown By Topic
This breakdown is not "official". See
Jeanne Boyarsky*'s Spring 3.X Certification Experiences for more details.
*
Thought I recognized the name from somewhere