[8u] RFR 8241248: NullPointerException in sun.security.ssl.HKDF.extract(HKDF.java:93)

[Alexey Bakhtin]

Hello All,

Could you please review fix for the JDK-8241248
Issue happens during the TLSv1.3 handshake in case of server receives several parallel requests with the same pre_shared_key.
The main idea of the fix is to remove resuming session from the session cache on the early stage.

JBS: https://bugs.openjdk.java.net/browse/JDK-8241248
Webrev: http://cr.openjdk.java.net/~abakhtin/8241248/webrev.v0/

The test from the bug report using OpenSSL is passed
javax/net/ssl and sun/security/ssl jtreg tests passed

Regards
Alexey