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use strict;
use IO::Socket::SSL;
...
$sock->close();

warn "loop exited.\n";

DEBUG: .../IO/Socket/SSL.pm:1545: new ctx 36279520
socket created: IO::Socket::SSL=GLOB(0x22775f4).
...

         connection closed.
DEBUG: .../IO/Socket/SSL.pm:489: no socket yet

public class SslSocketClient {
    public static void main(String[] args) throws Exception {
...
        System.out.println("   Protocol = " + ss.getProtocol());      
+  
    }
}

keyStore is : 
keyStore type is : jks
...
    at java.io.BufferedReader.readLine(BufferedReader.java:382)
    at SslSocketClient.main(SslSocketClient.java:19)