Support X25519 and X448 EC curves for Diffie-Hellman in the JSSE implementation for TLS 1.3. TLS 1.2 and earlier are organized very differently w.r.t. key agreement. This enhancement does not add support for X25519 and X448 for TLS 1.2 and earlier.
JDK-8217709TLS 1.3 server always answer Hello Retry Request (on chrome)