In sun/security/jgss, there are

GSSNameImpl.java:496: get rid of main, test2
ProviderList.java: get rid of commented out main()
jgss/ProviderList.java:526: public static void main(String[] args) throws GSSException {


In sun/security/krb5/
Credentials.java: get rid of commented out main()
Realm.java: get rid of main()

internal/crypto/Crc32CksumType.java: get rid of commented out main()

Test code should not be part of rt.jar.