[9] RFR: 8129389: javax/net/ssl/DTLS tests fail intermittently

[Artem Smotrakov]

I added more output for debugging intermittent failures in 
https://bugs.openjdk.java.net/browse/JDK-8132320

I also updated produceHandshakePackets() to handle NEED_UNWRAP_AGAIN.

http://cr.openjdk.java.net/~asmotrak/8129389/webrev.01/

Artem

On 05/18/2016 08:28 PM, Artem Smotrakov wrote:
> Hello,
>
> Please review the following patch for DTLS tests.
>
> A couple of DTLS tests which are based on DTLSOverDatagram.java fail 
> intermittently. I was not able to reproduce these failures. I am 
> proposing to update the tests to print more information to logs, so 
> that more information will be available if they fail next time.
>
> I also noticed that the tests doesn't check for FINISHED handshake 
> status which can be returned by wrap/unwrap methods. This status 
> should indicate that handshake finished.
>
> Changes:
> - enabled debug output by setting "javax.net.debug" system property to 
> "ssl"
> - added more logging to handshaking code
> - updated handshaking code to check for FINISHED status
> - added more checks to handshaking code
> - added try-with-resources blocks for sockets and file input streams
> - removed suppressed exceptions to make logs clearer
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8129389
> Webrev: http://cr.openjdk.java.net/~asmotrak/8129389/webrev.00/
>
> Artem