Avoid inaccessible object exception replacing set #5778
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Motivation:
When attempting to set the selectedKeys fields on the selector
implementation, JDK 9 can throw an inaccessible object exception.
Modications:
Catch and log this exception as an possible course of action if the
sun.nio.ch package is not exported from java.base.
Result:
The selector replacement will fail gracefully as an expected course of
action if the sun.nio.ch package is not exported from java.base.