The named groups that are implemented, and those that are enabled by default should be documented in the SunJSSE section of the JDK Providers guide. This would be consistent with other defaults that are documented, such as the protocol versions.

For JDK 27, the default named groups are: X25519MLKEM768, x25519, secp256r1, secp384r1, secp521r1, x448, ffdhe2048, ffdhe3072, ffdhe4096, ffdhe6144, and ffdhe8192.

The full list of implemented groups is ... (TBD).