Github user hanm commented on the issue:
https://github.com/apache/zookeeper/pull/700
@anmolnar So if I understand this correctly, this test
`ReconfigTest.testPortChangeToBlockedPort` will consistently failing under Java
11, because `this.ss = ServerSocketChannel.open();` will prevent the socket
close in first `tryClose(oldSS)`, which is why you moved the code block of
`this.ss = ServerSocketChannel.open();` after `tryClose(oldSS)`, right? ---
