[9] RFR: 8159416: javax/net/ssl/DTLS/CipherSuite.java failed on timeout

[Artem Smotrakov]

Hello,

Please review this patch for javax/net/ssl/DTLS tests.

A couple of DTLS tests fail intermittently on Mac with timeout or "Too 
many handshake loops ..." error. The tests use UDP to transfer DTLS 
records. It happens sometimes that server cannot receive UDP packets 
with DatagramSocket.receive() method even if client tries to re-send 
them multiple times. Please see logs in the bug.

At the moment, it is not clear why UDP packets can't be delivered to 
server. If someone has seen something similar before, or has some ideas 
what might be the root cause, please let me know.

I think that the tests and DTLS implementation are fine here. Since the 
tests are for DTLS, we can workaround this issue by avoiding real UDP 
connections. To avoid changing test logic much, we can use a custom 
DatagramSocketImpl and DatagramSocketImplFactory implementations to 
replace system UDP implementation.

The patch below updates the tests with the following:
- added custom DatagramSocketImpl and DatagramSocketImplFactory 
implementations to avoid real UDP connections
- added more test output, so that we can have more info it the tests 
fail again

I have run javax/net/ssl/DTLS/CipherSuite.java test in a loop on Mac, 
and I didn't see it failed. I also have run javax/net/ssl/DTLS tests on 
all supported generic platforms, and they worked fine.

Bug: https://bugs.openjdk.java.net/browse/JDK-8159416
http://cr.openjdk.java.net/~asmotrak/8159416/webrev.00/

Artem