The cacerts file for Java on Mac OS X Lion (and maybe previous versions) is at

/System/Library/Java/Support/CoreDeploy.bundle/Contents/Home/lib/security

To see what certs are in the store, you can use this command

keytool -list -keystore ./cacerts

the password by default is ‘changeit’

Unfortunately, the list is not much use because they’re all listed as ‘keychainrootca-##’ where ## is a number from 1 – 109 (at the time of this post)

Hope this helps someone.