Please test jdk-11-ea+4

[Alan Bateman]

jdk-11-ea+4 is the latest JDK 11 EA build [1]. It contains significant 
changes to SocketChannel and friends to separate the blocking and 
non-blocking code paths and also a re-work of asynchronous close. As 
discussed here, and summarized in a release note, the changes involve 
two subtle behavior changes, namely that configureBlocking may block if 
there is a I/O operation in progress, and performing a non-blocking I/O 
with the interrupt status set no longer closes the channel. For those 
invested in this area, now would be a good time to try out the latest 
build to see if you run into any issues.

-Alan

[1] http://jdk.java.net/11/