RFR JDK-8214129: SSL session resumption/SNI with TLS1.2 causes StackOverflowError

[Jamil Nimeh]

Hello all,

This fix covers an issue where large numbers of TLS 1.2 session 
resumptions were causing a StackOverflowError to occur.  This was 
happening because the SSLSessionImpl constructor creates a new 
unmodifiableList from the SNI list attached to the HandshakeContext.  
Since that is also an unmodifiableList, you get a new level of nesting 
of lists with each successive instantiation of SSLSessionImpl.  
Eventually it grows to the point that an iteration of the list causes a 
stack overflow.

Bug: https://bugs.openjdk.java.net/browse/JDK-8214129

Webrev: http://cr.openjdk.java.net/~jnimeh/reviews/8214129/webrev.01/

Thanks,

--Jamil