RFR: 8278263: Remove redundant synchronized from URLStreamHandler.openConnection methods

[Florent Guillaume]

On Fri, 12 Nov 2021 19:35:10 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> All this Handler's are stateless and there is nothing to protect via synchronization.

In theory a subclass overloading using a non-synchronized `openConnection(URL u, Proxy p)` could have relied on `openConnection(URL u)` delegating to it and having been synchronized. So maybe this requires a small CSR?

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PR: https://git.openjdk.java.net/jdk/pull/6373