RFR: 8274883: (se) Selector.open throws IAE when the default file system provider is changed to a custom provider [v3]

[Maxim Kartashev]

On Tue, 7 Dec 2021 10:45:50 GMT, Michael McMahon <michaelm at openjdk.org> wrote:

> I can sponsor it when we are finished with the review. 

Thank you, much appreciated!

> Would it be possible to refer to the TestProvider in the SelectorProvider/spi directory in the @build directive, instead of copying it over to the Selector directory?

I looked for a way to do that, but couldn't find any. Besides, the new variant of the custom provider is much smaller and simpler than the "original" `TestProvider` and slightly better suits the purpose. So it's not a completely wasted effort (i.e. if things break in `TestProvider` for reasons unrelated to Unix domain sockets, the new test is less likely to break).

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PR: https://git.openjdk.java.net/jdk/pull/6722