RFR(xs) 8206968: java/net/httpclient/CancelledResponse.java fails after TLS1.3 changeset

[Anthony Scarpino]

Below is a simple fix that the test intermittently fails on.

The problem is believed to be that the read thread sees a close_notify 
which cause the read thread to do a write operation.  That write 
operation conflicts with the on-going write thread usage of the Cipher 
object doing the encryption.  Synchronizing the methods fixes the 
conflict and performance should not be affected as encrypt operations 
should always be single-threaded.  Other solutions, like creating cipher 
objects or a cipher object pool would be a bigger performance hit in 
this limited failure situation.

Because the test is intermittent, I've never been able to reproduce it. 
Given different exceptions related to cipher initialization have occured 
in the encrypt method, I believe this will resolve the problem.

http://cr.openjdk.java.net/~ascarpino/8206968/webrev/

Tony