RFR of JDK-8202481: RegisterDuringSelect.java fails with java.util.concurrent.ExecutionException: java.nio.channels.ClosedSelectorException

[Hamlin Li]

would you please review the following patch?

This is a patch to fix JDK-8202481 and add debug info for JDK-8206959.

bug: https://bugs.openjdk.java.net/browse/JDK-8202481, 
https://bugs.openjdk.java.net/browse/JDK-8207023

webrev: http://cr.openjdk.java.net/~mli/8202481/webrev.00/


Thank you

-Hamlin