RFR: 8375183: Remove unused SSLConfiguration.maximumProtocolVersion variable

[Koushik Muthukrishnan Thirupattur]

On Tue, 13 Jan 2026 20:50:11 GMT, Artur Barashev <abarashev at openjdk.org> wrote:

>> Won't it require additional null checks then? Now it essentially defaults to a max protocol version, which was always present (`ProtocolVersion.NONE` by default)
>
> We don't need null checks, `protocolVersion` currently is not used before it's set to the negotiated protocol, and we'll get a NPE if somebody tries to use it before it's set. It is basically a representation of negotiated protocol in `TransportContext`.

In that case, instead of leaving it null, can we consider initializing protocolVersion to ProtocolVersion.NONE with a short comment? That would avoid using null as state and make the intent more explicit/readable.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29192#discussion_r2688865119