On Wed, 18 Aug 2021 19:03:10 GMT, djelinski 
<github.com+30433125+djelin...@openjdk.org> wrote:

>> Corner case where a session resumption can fail if the TLS server changes 
>> supported protocol versions in relation to a cached SSLSession. This is 
>> primarily an issue where the legacy TLS version is used in place of the 
>> newer "supported_versions" TLS extension.
>
> Also fixes resumption when server is a Java application run with 
> `-Djdk.tls.allowLegacyResumption=false`, client is a Java application with 
> `-Djdk.tls.useExtendedMasterSecret=false`, and TLSv1.2 is negotiated.
> As a side note, it should be possible to merge 
> `HandshakeContext#handshakeSession` and `HandshakeContext#resumingSession` 
> into a single field now

thanks for the comments @djelinski - per Dev advise, I've split this issue into 
2 bugs. This issue will focus on altering the legacy maximum TLS protocol 
version field sent in the ClientHello.  Patch just updated.

A follow on fix will focus on the session invalidation issue (JDK-8272653)

-------------

PR: https://git.openjdk.java.net/jdk/pull/5110

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