JDK-8142872 : Remove support for sun.nio.ch.PollSelectorProvider from 9
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PollSelectorProvider has been superseded on all platforms and should not be used under any circumstances. It would be good to send a clear message by removing support in order to avoid issues like JDK-8076282.
Superior SelectorProvider implementations exist for all Oracle JDK platforms and PollSelectorProvider should not be used on those platforms if at all possible. That being the case we're removing it from the build on all Oracle supported platforms while leaving the source in the repo for reference purposes.